Готові списки джерел за темами / Paper Elastic properties Testing

Добірка наукової літератури з теми "Paper Elastic properties Testing"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Paper Elastic properties Testing"

1

Darnbrough, J. E., S. Mahalingam, and Peter E. J. Flewitt. "Micro-Scale Cantilever Testing of Linear Elastic and Elastic-Plastic Materials." Key Engineering Materials 525-526 (November 2012): 57–60. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.57.

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t is increasingly a requirement to be able to determine the mechanical properties of materials: (i) at the micro-scale, (ii) that are in the form of surface coatings and (iii) that have nanoscale microstructures. As a consequence micro-scale testing is an important tool that has been developed to aid the evaluation of the mechanical properties of such materials. In this work cantilever beam specimens (typically 2μm by 2μm by 10μm in size) have been prepared by gallium ion milling and then deformed in-situ within a FEI Helios Dual Beam workstation. The latter is achieved using a force probe with a geometry suitable for loading the micro-scale test specimens. Thus force and displacement can be measured together with observing the deformation and fracture of the individual specimens. This paper considers the evaluation of the mechanical properties in particular elastic modulus, yield strength and fracture strength of materials that result in relatively large deflections to the micro-scale cantilever beams. Two materials are considered the first is linear elastic single crystal silicon and the other elastic-plastic nanocrystalline (nc) nickel. The results are discussed with respect to the reproducibility of this method of mechanical testing and the evaluated properties are compared with those derived by alternative procedures.
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2

Park, Na Young, Young Chan Ko, Lili Melani, and Hyoung Jin Kim. "Mechanical properties of low-density paper." Nordic Pulp & Paper Research Journal 35, no. 1 (March 26, 2020): 61–70. http://dx.doi.org/10.1515/npprj-2019-0052.

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AbstractFor the mechanical properties of paper, tensile testing has been widely used. Among the tensile properties, the tensile stiffness has been used to determine the softness of low-density paper. The lower tensile stiffness, the greater softness of paper. Because the elastic region may not be clearly defined in a load-elongation curve, it is suggested to use the tensile modulus which is defined as the slope between the two points in the curve. The two points which provide the best correlation with subjective softness evaluation should be selected. Low-density paper has a much lower tensile strength, but much larger elongation at the break. It undergoes a continuous structural change during mechanical testing. The degree of the structural change should depend on tensile conditions such as the sample size, the gauge length, and the rate of elongation. For low-density paper, the tensile modulus and the tensile strength should be independent of each other. The structure efficiency factor (SEF) is defined as a ratio of the tensile strength to the tensile modulus and it may be used a guideline in developing superior low-density paper products.
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3

Wang, H. X., Jing He Wang, and Shen Dong. "Nanoindentation Size Effect of KDP Crystal by Instrumented Indentation Testing." Key Engineering Materials 364-366 (December 2007): 188–92. http://dx.doi.org/10.4028/www.scientific.net/kem.364-366.188.

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Indentation tests and single-point scratch tests are probably the simplest methods of measuring the elastic, plastic and fracture behavior of brittle materials. In this paper, the nearsurface mechanical properties of KDP single crystal have been investigated including the elasticity like Young’s modulus E, and the plasticity like the hardness H. These material properties can be used to predict the material responses in optical manufacturing operations. Hardness and elastic modulus on different crystal plane of KDP single crystal have been examined under different loads by nanoindentation test, and the influence of the indentation load on hardness and elastic modulus have been also analyzed systematically. The results show the nanoindentation size effect, that is, the hardness and elastic modulus increase as the indentation load decreases. The hardness and elastic modulus have strong anisotropy in the different crystallographic orientation of the same crystal plane.
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4

Lin, Yu Hua, and Chia Lung Chang. "Inverse Method Based on Modal Vibration Testing for Characterizing the Elastic Properties." Advanced Materials Research 83-86 (December 2009): 198–205. http://dx.doi.org/10.4028/www.scientific.net/amr.83-86.198.

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This paper presents a inverse method to derive the material properties from the resonance frequencies of a free-edge test specimen based on modal vibration test. A mixed numerical experimental identification procedure is used for this purpose. Finite element models of the test plate is simultaneously updating and reproduces the updating frequencies, then optimal procedure is running. The sum of the squared differences between the experimental and the finite element method numerical resonance frquencies is the objective function. To seek practical solutions, here presents a global optimization method--simulated annealing method for the determination of the elastic properties. The inverse method is applied to determine the elastic constants of aluminum , carbon/epoxy , Glass/PP composite material and double coated steel plate. The results indicate that the method can obtain very accurate elastic constants for aluminum , Glass/PP , carbon/epoxy composite material ,but for double coated steel plate , if the individual layer of the three different layers is as isotroptic material having six elastic constants , the method can obtain very accurate results , but if it is as transversely isotropic material having twelve elastic constants, the evaluating elastic constants are bad.
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5

Kim, J., W. Jung, C. H. Jo, J. Shelton, and W. Craft. "Mechanical properties of cellulose-based electro-active paper." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 4 (April 1, 2008): 577–83. http://dx.doi.org/10.1243/09544062jmes652.

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Mechanical properties of cellulose-based electro-active paper (EAPap) are characterized in this work. Cellulose-based EAPap has been studied as a potential actuator concept, as a result of its low actuation voltage, lightweight, low power consumption, biodegradability and low cost. EAPap is made from cellulose paper, coated with thin electrically conducting electrodes. This EAPap shows a reversible and reproducible bending movement as well as a longitudinal displacement under electric field excitation. However, the EAPap is a complex anisotropic material, which has not been extensively characterized. It is important to have extended property data for EAPap so that the actuator performance can be optimized, and this requires additional material testing. Our material test results show that EAPap has two distinct elastic constants. The initial Young's modulus of EAPap is in the range of 4–9 GPa, which is higher than other polymer materials. This modulus is also orientation dependent, which may be associated with the piezoelectricity of the EAPap materials. Another important property is that the dynamically induced mechanical strains of these materials exhibit linear creep behaviour as confirmed by constant stress and low frequency cyclic loading tests. From scanning electron microscope investigations, cellulose EAPap exhibits a layered, anisotropic cellulose macromolecular structure that exhibits both elastic and plastic deformations, as well as substantial temperature and humidity dependence.
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6

Jankovic-Castvan, Ivona, Slavica Lazarevic, Dusica Stojanovic, Predrag Zivkovic, Rada Petrovic, and Djordje Janackovic. "PVB/sepiolite nanocomposites as reinforcement agents for paper." Journal of the Serbian Chemical Society 81, no. 11 (2016): 1295–305. http://dx.doi.org/10.2298/jsc160506067j.

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In order to improve the mechanical properties of paper, 1, 3 and 5 wt.% of sepiolite were dispersed in a poly(vinyl butyral) (PVB) matrix and coated onto the surface of schrenz (110 g m-2). Deagglomerated sepiolite nanofibers in PVB matrix on paper surface were observed by scanning electronic microscopy. The glass transition temperature of schrenz with PVB/sepiolite coatings was not changed with increasing content of sepiolite. Two different methods were used to evaluate the mechanical properties of the paper sample reinforced with PVB/sepiolite nanocomposites: tensile testing and nanoindentation. The values of breaking force and tensile energy absorption of the reinforced paper samples obtained by tensile testing were increased by up 10 %. The values of the reduced elastic modulus and hardness obtained by nanoindentation were increased by up to 78 %. The best improvement of the mechanical properties was shown by the paper sample coated with PVB/3 wt.% sepiolite nanocomposite.
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7

Shcherbakov, Y. M., and V. N. Frolov. "Method of plastics endurance testing." Izvestiya MGTU MAMI 8, no. 1-3 (May 10, 2014): 28–34. http://dx.doi.org/10.17816/2074-0530-67558.

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The authors propose a method for testing plastics endurance under plane transverse bending with a given cyclic deformation. The paper describes the relations for the calculation of the amount of deflection, rotation angles of the end parts of a sample and the technological gap d between the pins in movable supports and a model for the transverse bending of a sample, the properties of which are given by linear-elastic and nonlinear elastic (according to power law) models. To determine the dependence of stresses on the number of cycles before sample failure, the authors propose the method for estimating stress with the use of the dependence of stresses on the number of cycles before failure and stress-deformation dependence, obtained in quasi-static tests under "instantaneous" loading.
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8

Mokhtari, Mehdi, Matt M. Honarpour, Azra N. Tutuncu, and Gregory N. Boitnott. "Characterization of Elastic Anisotropy in Eagle Ford Shale: Impact of Heterogeneity and Measurement Scale." SPE Reservoir Evaluation & Engineering 19, no. 03 (June 1, 2016): 429–39. http://dx.doi.org/10.2118/170707-pa.

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Summary Heterogeneity and anisotropy were characterized in some Eagle Ford shale samples at various scales by use of scanning-electron-microscopy (SEM) imaging, computed-tomography (CT) scanning, and compressional-velocity scanning. Triaxial testing on 1-in.-diameter and 3-in.-diameter core samples and well-log analysis were used to calculate elastic properties by using vertical transverse isotropic modeling. Correlations between the stiffness coefficients and the correlations between static and dynamic properties from laboratory tests were applied to well-log analysis to improve the calculation of minimum horizontal stress. This paper provides the elastic properties of the Eagle Ford shale at various measurement scales. The paper also elaborates the role of heterogeneity in laboratory testing of shale reservoirs.
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9

Pazdera, Lubos, Libor Topolar, Jaroslav Smutny, and Kristyna Timcakova. "Nondestructive Testing of Advanced Concrete Structure during Lifetime." Advances in Materials Science and Engineering 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/286469.

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The paper reports on measurements and analysis of the measurements during hardening and drying of specimens using selected acoustic nondestructive testing techniques. An integrated approach was created for better understanding of the relations between the lifetime cycle and the development of the mechanical properties of concrete. Acoustic emission, impact echo, and ultrasonic techniques were applied simultaneously to the same mixtures. These techniques and results are presented on alkali-activated slag mortars. The acoustic emission method detects transient elastic waves within the material, caused by the release of cumulated stress energy, which can be mechanical, thermal, or chemical. Hence, the cause is a phenomenon which releases elastic energy into the material, which then spreads in the form of an elastic wave. The impact echo method is based on physical laws of elastic stress wave propagation in solids generated by mechanical impulse. Ultrasonic testing is commonly used to find flaws in materials or to assess wave velocity spreading.
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10

Smirnov, Alexander, Evgeniya Smirnova, and Yulia Khudorozhkova. "Constructing a two-level computational model of cross-ply fiberglass-reinforced plastic from micromechanical testing." Polymers and Polymer Composites 30 (January 2022): 096739112211124. http://dx.doi.org/10.1177/09673911221112414.

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This paper deals with solving the problem of constructing two-level computational models relating the stress-strain state at the microscale to the stress-strain state of the structural component at the macroscale for layered polymer composite materials with unidirectional fiber stacking in a monolayer. The paper presents a two-level computational mechanical model of a ten-layer cross-ply fiberglass-reinforced polymer composite with (0/90) laying patterns. The model is based on microindentation data. The model is constructed using the finite element method. The constructed model has allowed us to predict the elastic properties of the composite and to calculate stresses at the microscale and macroscale levels of a specimen prior to fracture under tensile conditions. The elastic properties of the polymer composite material predicted by the computational model are compared with the properties obtained from real experiments. Calculated for fiberglass, the elasticity modulus and Poisson’s ratio are 31 GPa and 0.11, respectively. Similar elastic properties obtained from real experiments are 28 GPa and 0.10. The technique used in the paper can be applied to computational experiments with an actual structural component made of a multilayer polymer composite in order to determine the stress-strain state at the micro- and macroscale under external mechanical impact on the structure.
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Дисертації з теми "Paper Elastic properties Testing"

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Armstrong, D. E. J. "Measuring elastic, plastic and fracture properties using micro-cantilever testing." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526568.

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Sun, Miao. "Optimal Recovery of Elastic Properties for Anisotropic Materials through Ultrasonic Measurements." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/SunM2002.pdf.

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Johnson, Mont A. "Investigation of the mechanical properties of copy paper using laser generated and detected lamb waves." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/16730.

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Griggs, David Allen. "A laser-based ultrasonic system to measure the mechanical properties of paper products in a controlled environment." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/16801.

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Lawson, Joseph L. "On the determination of the elastic properties of geopolymeric materials using non-destructive ultrasonic techniques /." Online version of thesis, 2008. http://hdl.handle.net/1850/7356.

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Sidwall, Thygesen Signe, Astrid Berghult, and Camilla Öhman. "Prediction of elastic properties of nanofibrillated cellulose and microcrystalline cellulose : by mathematical models and tensile testing." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-177367.

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Vorakunpinij, Adisak. "The effect of paper structure on the deviation between tensile and compressive responses." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/7058.

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Forde, Kohler Lois J. "The effects of ophiostoma piliferm on wood pulp : investigation." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/5982.

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9

Fang, Hui. "Evaluation on mechanical properties of micro/nano-meter scale materials by resonant vibration." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215220.

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Tecle, Hagos Ghebremicael. "The psychometric properties of the Paper and Pencil Games Level 2 for Tigrigna-speaking children in Eritrea." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53666.

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Thesis (MA)--Stellenbosch University, 2003.
ENGLISH ABSTRACT: The aim of this study was to investigate the psychometric properties of a screening test of cognitive ability, the Paper and Pencil Games Level 2 (PPG Level 2), for Tigrignaspeaking schoolchildren in Eritrea. This study represents one of the first attempts to measure cognitive ability in Eritrea. The PPG was developed in South Africa (Claassen, 1996) as a group test of general cognitive ability for children in Grade 2 and 3 (PPG Level 2), and Grade 4 and 5 (PPG Level 3). The PPG provides Total, Verbal and Nonverbal ability scores. The Verbal Scale consists of two subtests, namely (a) Verbal and Quantitative Reasoning and (b) Comprehension. The Non-verbal Scale consists of three subtests, namely (a) Figure Classification, (b) Figure Series, and (c) Pattern Completion. Although the PPG has the appearance of a standardized intelligence test, Claassen emphasized that it is best used as a screen for academic difficulties or failures. Participants were 577 Tigrigria-speaking Grade 3 children. The children were selected from schools in the capital, Asmara, from small towns, and villages. Eleven schools participated. The participants can be considered representative of the Grade 3 Tigrignaspeaking population in Eritrea. The PPG Level 2 was completed under supervision of the researcher. Classical and Rasch item analyses were conducted on the Verbal and Non-verbal Scales, respectively. The internal consistency of the Non-verbal scale can be considered satisfactory for a screening instrument (Cronbach's a = .85). Furthermore, the non-verbal items showed satisfactory fit to the Rasch model (INFIT values and OUTFIT values < 1.3 for all items), suggesting that they measure a unidimensional construct. In addition, the item difficulty estimates corresponded well with the serial order of the items, with easy items being presented earlier than more difficult items. The internal consistency of the Verbal scale was lower (Cronbach's a = .72), which can probably be attributed to the relative easiness of the items for the particular group of participants. The verbal items also showed satisfactory fit to the Rasch model. The Rasch analysis, which expresses person ability and item difficulty on the same scale, clearly showed that the Verbal items were too easy for the majority of the children. However, it should be kept in mind that the PPG is intended to discriminate among children with low ability. Hence, the observed mismatch between the abilities and item difficulties was not unexpected. It should also be noted that the serial order of the items did not correspond well with item difficulty, with some difficult items being presented early and some easy items presented late in the scale. The five subtests of the PPG were subjected to a confirmatory factor analysis. Two models were specified and compared. Model 1 specified a single general factor; this provided a more parsimonious description of the data and showed a satisfactory fit with the data, though a bit weaker than that of Model 2. Model 2 specified two correlated factors, namely a Verbal and a Non-verbal factor. Model 2 also fitted the data well, but a high correlation between the factors was observed (r = .77; r2 = .59), suggesting the presence of a general factor. The results provide support for two levels of interpretation, namely on the Total score level and the Verbal and Non-verbal level. The validity of the PPG Level 2 was further investigated by examining the correlations between the PPG scores and teacher ratings of academic achievement. Because different schools had different raters, the correlations within each of the schools were pooled to obtain an estimate of the correlations between the PPG scales and academic achievement for the total group. The pooled correlation for the PPG Total score with academic achievement was .56, for the Non-Verbal score .53, and for the Verbal score .41. The correlations for the Total and Non-verbal scores are similar to those typically reported in the educational psychology literature and provide support for the validity of these scales as a screen for academic difficulties. The results show that the PPG, which was developed in South Africa, may be fruitfully exported to Eritrea. It is recommended, however, that before the PPG Level 2 is routinely used for screening purposes with Tigrigna-speaking children, the functioning of the Verbal Scale should be re-examined and possibly some of the Verbal items should be rewritten.
AFRIKAANSE OPSOMMING: Die doel van die onderhawige studie was om die psigometriese eienskappe van 'n siftingstoets van kognitiewe vermoë, naamlik die Paper and Pencil Games Level 2 (PPG Level 2), vir Tigrigna-sprekende kinders in Ertirea te bestudeer. Hierdie studie verteenwoordig een van die eerste pogings om kognitiewe vermoë in Eritrea te meet. Die PPG is in Suid-Afrika ontwikkel (Claassen, 1996) as 'n groeptoets van kognitiewe vermoë vir kinders in Grade 2 en 3 (PPG Level 2), en Grade 4 en 5 (PPG Level 3). Die PPG lewer tellings van kognitiewe vermoë op drie vlakke, naamlik Totaal, Verbaal en Nie-Verbaal. Die Verbale skaal bestaan uit twee subskale: (a) Verbale en Kwantitatiewe redenering en (b) Begrip. Die Nie-Verbale skaal bestaan uit drie subskale, naamlik (a) Figuur Klassifisering, (b) Figuurreekse en (c) Patroonvoltooiing. Alhoewel die PPG op die oog af soos 'n konvensionele intelligensietoets lyk, beklemtoon Claassen dat dit te beste geskik is as 'n siftingsinstrument vir akademiese probleme of mislukkings. Die deelnemers was 577 Tigrigna-sprekende kinders in Graad 3. Die kinders is uit skole van die hoofstad, Asmara, klein dorpe en geselekteer. Elf skole het aan die studie deelgeneem. Daar kan aanvaar word dat die deelnemers verteenwoordigend is van die Graad 3 Tigrigna-sprekende populasie in Eritrea. Die PPG Level 2 is onder supervisie van die navorser voltooi. Klassieke en Rasch item-ontledings is op die Verbale en Nie- Verbale skale, onderskeidelik, uitgevoer. Die interne konsekwentheid van die Nie- Verbale skaal kan as bevredigend vir 'n siftingsinstrument beskou word (Cronbach se a = .85). Hierbenewens het die Nie-Verbale items 'n bevredigende passing met die Rasch model getoon (INFIT gemiddelde kwadrate en OUTFIT gemiddelde kwadrate < 1.3 vir alle items), wat daarop dui dat die items 'n essensiëel eendimensionele konstruk meet. Die moeilikheidswaardes van die Nie- Verbale items het ook sterk ooreengestem met die volgorde waarin die items in die skaal aangebied word - die maklike items is eerste aangebied en daarna die moeilike items. Die interne konsekwentheid van die Verbale skaal was laer (Cronbach se a = .72). Die laer koëffisiënt kan waarskynlik aan die relatiewe lae moeilikheidsgraad van die Verbale items toegeskryf word. Die Verbale items het egter ook 'n bevredigende passing met die Rasch model getoon. Die Rasch ontleding, wat vermoë en item moeilikheid op dieselfde skaal uitdruk, het duidelik getoon dat die Verbale items te maklik vir die meeste kinders was. Daar dien egter op gelet te word dat die PPG ontwerp is om te diskrimineer tussen kinders met relatiewe lae vermoëns. In hierdie lig gesien is die swak passing tussen vermoë en item moeilikhede nie te onverwags nie. Die volgorde waarin die items in die skaal aangebied word het ook nie goed ooreengestem met die item moeilikheidswaardes nie - sommige moeilike items is vroeg in die skaal aangebied en sommige maklike items laat in die skaal. Die vyf subtoetse van die PPG is aan 'n bevestigende faktorontleding onderwerp. Twee modelle is gespesifiseer en vergelyk. Model 1 het 'n enkele algemene faktor gespesifisieer.
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Книги з теми "Paper Elastic properties Testing"

1

1931-, Rossiter Bryant W., and Baetzold Roger C, eds. Determination of elastic and mechanical properties. New York: Wiley, 1991.

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2

Carbon nanotubes and nanosensors: Vibration, buckling, and balistic impact. London, UK: ISTE, 2012.

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3

Towers, O. L. Test for fracture toughness and fatigue assessment: A compilation of stress intensity, compliance, and elastic n factors. Cambridge, England: Welding Institute, 1985.

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4

Miller, James G. An approach for relating the results of quantitative nondestructive evaluation to intrinsic properties of high-performance materials: Semiannual progress report : September 15, 1989 - March 14, 1990. St. Louis, Mo: Washington University, Dept. of Physics, Laboratory for Ultrasonics, 1990.

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5

Miller, James G. Quantitative non-destructive evaluation of composite materials based on ultrasonic wave propagation: Semiannual progress report March 15, 1985 - September 15, 1985. St. Louis, Mo: Washington University, Laboratory for Ultrasonics, 1985.

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6

Miller, James G. Quantitative non-destructive evaluation of composite materials based on ultrasonic wave propagation: Semiannual progress report, March 15, 1986 - September 14, 1986. St. Louis, Mo: Washington University, Dept. of Physics, Laboratory for Ultrasonics, 1986.

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7

Cox, Brian N. Handbook of analytical methods for textile composites. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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8

(Editor), Bryant W. Rossiter, and Roger C. Baetzold (Editor), eds. Determination of Elastic and Mechanical Properties, Volume 7, Physical Methods of Chemistry, 2nd Edition. Wiley-Interscience, 1991.

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9

W, Perkins Richard, American Society of Mechanical Engineers. Winter Meeting (1990 : Dallas, Tex.), American Society of Mechanical Engineers. Applied Mechanics Division., American Society of Mechanical Engineers. Materials Division., and Symposium on Mechanics of Wood and Paper Materials (1990 : Dallas, Tex.), eds. Mechanics of wood and paper materials: Presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, Dallas, Texas, November 25-30, 1990. New York, N.Y: ASME, 1990.

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10

Center, Langley Research, ed. Quantitative non-destructive evaluation of composite materials based on ultrasonic wave propagation: Semiannual progress report, March 15, 1985 - September 15, 1985. St. Louis, Mo: Washington University, Dept. of Physics, Laboratory for Ultrasonics, 1985.

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Частини книг з теми "Paper Elastic properties Testing"

1

Wei, Ya, Siming Liang, and Weikang Kong. "Testing and Analysis of Micro Elastic Properties." In Mechanical Properties of Cementitious Materials at Microscale, 189–234. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6883-9_6.

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Storteboom, O., M. Woollard, and J. L. Rangel-Núñez. "Elastic soil properties investigated using seismic tests to complement the CPT." In Cone Penetration Testing 2022, 241–46. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003308829-30.

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3

Storteboom, O., M. Woollard, and J. L. Rangel-Núñez. "Elastic soil properties investigated using seismic tests to complement the CPT." In Cone Penetration Testing 2022, 242–47. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003329091-30.

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4

Kažys, R., and P. Stolpe. "Ultrasonic on-line non-destructive evaluation of elastic properties of paper." In Emerging Technologies in NDT, 269–74. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003078586-47.

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5

Kozhushko, V. V., V. P. Sergienko, Y. N. Mirchev, and A. R. Alexiev. "Characterization of Elastic Properties of Metals and Composites by Laser-Induced Ultrasound." In Non-destructive Testing and Repair of Pipelines, 209–25. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56579-8_14.

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6

Kinra, V. K., and V. Dayal. "Acoustic Methods of Evaluating Elastic Properties or, Will the Real Young’s Modulus Please Stand Up?" In Manual on Experimental Methods for Mechanical Testing of Composites, 97–103. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1129-1_14.

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7

Tanabe, Kotaro, Yoshinori Tanabe, and Masami Hagiya. "Model-Based Testing for MQTT Applications." In Knowledge-Based Software Engineering: 2020, 47–59. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53949-8_5.

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Abstract Model-based testing is a widely-used vital technique for testing software running in a complex environment. In this paper, we propose extensions to existing model-based tools to apply this technique to software that employs the MQ Telemetry Transport (MQTT) protocol for transmitting messages, commonly used in the Internet of Things (IoT) environment. First, in the finite state machine used for generating test cases in a model-based testing framework, we introduce a type of transition that is triggered when receiving MQTT messages. Second, we extend the finite-state machine so that it produces test cases that reflect the characteristics of IoT software – a large number of relatively simple devices communicate with servers. Third, the concept of time is introduced into the finite state machine. Naturally, this is necessary for verifying the properties of software that runs for a long time. Moreover, to facilitate such verification, both real-time and virtual time are introduced. We implemented these extensions into a model-based testing tool, Modbat, and conducted a small experiment to confirm the feasibility, gaining positive results.
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8

Matei, Alexander, and Stefan Ulbrich. "Detection of Model Uncertainty in the Dynamic Linear-Elastic Model of Vibrations in a Truss." In Lecture Notes in Mechanical Engineering, 281–95. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_22.

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AbstractDynamic processes have always been of profound interest for scientists and engineers alike. Often, the mathematical models used to describe and predict time-variant phenomena are uncertain in the sense that governing relations between model parameters, state variables and the time domain are incomplete. In this paper we adopt a recently proposed algorithm for the detection of model uncertainty and apply it to dynamic models. This algorithm combines parameter estimation, optimum experimental design and classical hypothesis testing within a probabilistic frequentist framework. The best setup of an experiment is defined by optimal sensor positions and optimal input configurations which both are the solution of a PDE-constrained optimization problem. The data collected by this optimized experiment then leads to variance-minimal parameter estimates. We develop efficient adjoint-based methods to solve this optimization problem with SQP-type solvers. The crucial test which a model has to pass is conducted over the claimed true values of the model parameters which are estimated from pairwise distinct data sets. For this hypothesis test, we divide the data into k equally-sized parts and follow a k-fold cross-validation procedure. We demonstrate the usefulness of our approach in simulated experiments with a vibrating linear-elastic truss.
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9

Padhiyar, Sumit, and K. C. Sivaramakrishnan. "ConFuzz: Coverage-Guided Property Fuzzing for Event-Driven Programs." In Practical Aspects of Declarative Languages, 127–44. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67438-0_8.

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AbstractBug-free concurrent programs are hard to write due to non-determinism arising out of concurrency and program inputs. Since concurrency bugs typically manifest under specific inputs and thread schedules, conventional testing methodologies for concurrent programs like stress testing and random testing, which explore random schedules, have a strong chance of missing buggy schedules.In this paper, we introduce a novel technique that combines property-based testing with mutation-based, grey box fuzzer, applied to event-driven OCaml programs. We have implemented this technique in , a directed concurrency bug-finding tool for event-driven OCaml programs. Using , programmers specify high-level program properties as assertions in the concurrent program. uses the popular greybox fuzzer AFL to generate inputs as well as concurrent schedules to maximise the likelihood of finding new schedules and paths in the program so as to make the assertion fail. does not require any modification to the concurrent program, which is free to perform arbitrary I/O operations. Our experimental results show that is easy-to-use, effective, detects concurrency bugs faster than Node.Fz - a random fuzzer for event-driven JavaScript programs, and is able to reproduce known concurrency bugs in widely used OCaml libraries.
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Murray, Yvonne, David A. Anisi, Martin Sirevåg, Pedro Ribeiro, and Rabah Saleh Hagag. "Safety Assurance of a High Voltage Controller for an Industrial Robotic System." In Lecture Notes in Computer Science, 45–63. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-63882-5_4.

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Abstract Due to the risk of discharge sparks and ignition, there are strict rules concerning the safety of high voltage electrostatic systems used in industrial painting robots. In order to assure that the system fulfils its safety requirements, formal verification is an important tool to supplement traditional testing and quality assurance procedures. The work in this paper presents formal verification of the most important safety functions of a high voltage controller. The controller has been modelled as a finite state machine, which was formally verified using two different model checking software tools; Simulink Design Verifier and RoboTool. Five safety critical properties were specified and formally verified using the two tools. Simulink was chosen as a low-threshold entry point since MathWorks products are well known to most practitioners. RoboTool serves as a software tool targeted towards model checking, thus providing more advanced options for the more experienced user. The comparative study and results show that all properties were successfully verified. The verification times in both tools were in the order of a few minutes, which was within the acceptable time limit for this particular application.
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Тези доповідей конференцій з теми "Paper Elastic properties Testing"

1

Marur, Prabhakar R., and Hareesh V. Tippur. "Evaluation of Elastic Properties of a Functionally Graded Composite Using an Elastic-Impact Technique." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-1048.

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Abstract An experimental technique for evaluating the elastic properties of functionally graded materials (FGM) is proposed. Ultrasonic pulse-echo measurements in conjunction with elastic impact testing permit determination of Young’s modulus, Poisson’s ratio and their longitudinal variation. The details of the formulation of the technique and the implementation issues are discussed in this paper. These techniques have been applied successfully to evaluate the properties of a unidirectionally graded glass-epoxy particulate composite.
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2

Shelton, John, William J. Craft, Jaehwan Kim, Jamil Grant, Jag Sankar, and Sang H. Choi. "Fatigue Properties of Electro-Active Papers for Biomimetic Actuators." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80552.

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Cellulose-based Electro-Active Papers (EAPap) have been studied as potential actuators as a result of their low voltage operation, light weight, and low power consumption. In addition, they are bio-degradable and potentially inexpensive.1 The construction of many EAPap electromechanical actuators has been based on cellulose paper film coated with thin electrode layers. This EAPap actuator has shown a reversible and reproducible bending movement as well as longitudinal displacement under low voltage alternating current. However, the EAPap is a complex anisotropic material, which has not been extensively characterized and additional basic and design testing is required before developing EAPap application and devices. It is important to know the extended fatigue and elastic properties of EAPap materials, and this requires testing and evaluation. It has been known that the cellulose based EAPap has two distinct elastic constants connected by a bifurcation point along the stress strain diagram.2 The initial Young’s modulus of EAPap is in the range of 5-8GPa, - quite high compared to other polymer materials.3 Since these materials are anisotropic, elastic properties also differ as a function of orientation. These materials are sensitive to humidity and temperature. Fatigue tests conducted and described in this paper identify critical properties of this under-analyzed class of materials to provide a measure of its fatigue capabilities. Mechanical strain of EAPap materials has been evaluated, and it appears to follow closely a linear creep model as confirmed by low frequency cyclic (fatigue) loading. The creep parameter has also been determined to be a function of temperature and load level for all the EAPap materials tested.
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3

Zhu, X., M. Serati, E. Mutaz, and Z. Chen. "True Triaxial Testing of Anisotropic Solids." In 56th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/arma-2022-2125.

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ABSTRACT: Accurate determination of rock mechanical properties (particularly sedimentary shales, mica and schists with foliation and bedding planes) is critical to the safe design and excavation of underground mines and tunnels. Traditional techniques to calculate rock elastic properties often involve testing cylindrical or disc-shaped specimens under uniaxial compression or diametrical loading. But, these stress conditions may not represent the actual stress state under which rock is subjected at depth. A true triaxial testing technique on cubed specimens are, therefore, preferred as it better represents field stress conditions. This paper introduces and verifies a modified step-compression true-triaxial based technique to measure the elastic constants in fibre-reinforced epoxy samples, selected as a low-porosity anisotropic solid. The elastic constants obtained from the proposed method (even under higher stress levels) are found to be in good agreement with results from the benchmark tests with uniaxial compression but in the meanwhile offers other anisotropic parameters, which cannot be obtained from conventional measurements. 1. INTRODUCTION Accurate determination of rock directional elastic properties has always been a hot topic in rock mechanics with immediate applications in most geotechnical and mining engineering (Eberli et al., 2003). While rock is frequently treated as a CHILE (continuous, homogeneous, isotropic, and linearly elastic) medium, this assumption provides only limited insight into the true rock mass deformations (Chou & Chen, 2008; Serati, Alehossein, & Williams, 2016). A more practical rock behavior is therefore the consideration of rock anisotropy, since many rocks exposed near the Earth’s surface show various levels of directionally dependent properties due to bedding, stratification, foliation, fissuring, schistosity, jointing, and faulting (Amadei, 1996). In the stress-strain relationship study for a loaded rock sample, rock behavior can be generally classified into four categories: isotropic, transversely isotropic, orthotropic, and anisotropic. The number of elastic constants to represent the stress-strain relation of a complete anisotropic rock is 21. However, due to the elastic symmetry of three isotropic planes, the number of stiffness constants of an orthotropic material can be reduced to nine (9) constants only. It can be further reduced to five elastic parameters for a transversely isotropic material (E1, E2, ν1, ν2, and G2) and two (namely the Poisson’s ratio and Young’s modulus) for a perfectly isotropic material, where the subscripts "1" and "2" refer to in-plane and out-of-plane directions in transversely isotropic materials (Ding et al., 2006).
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4

Park, Young H., and Wesley Morgan. "Study of Effective Elastic Moduli of Cracked Solid." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1897.

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In this paper, effective moduli of cracked solid material were investigated. An analytical approach is discussed for a cracked solid containing randomly oriented inclusions by using elastic potential and a standard tensorial basis. A numerical simulation of the testing of mechanical responses of samples of cracked solid material (porous material) is also carried out. The numerical scheme in this work will focus mainly on numerical modeling of the observed behavior, in particular, the dependence of the macroscopic material properties on the porocity.
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5

Adams, Timothy M., Jie Wen, Shawn Nickholds, and Douglas Munson. "Tensile Stress-Strain Properties and Elastic Modulus of PE 4710 Cell Classification 445574C High Density Polyethylene Pipe Material." In ASME 2013 Power Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/power2013-98077.

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For corroded piping in low temperature systems replacement of buried carbon steel pipe with high density polyethylene (HDPE) pipe is a cost-effective solution. The ASME Boiler and Pressure Vessel Code, Section III, Division 1, Code Case N755-1 currently permits the use of HDPE in buried Safety Class 3 piping systems. This paper presents the results of tensile testing of PE 4710 cell classification 445574C pipe compliant with the requirements of Code Case N755-1. This information was developed to support and provide a strong technical basis for tensile properties of HDPE pipe. The data may also be useful for applications of HDPE pipe in commercial electric power generation facilities and chemical, process, and waste water plants via its possible use in the B31 series piping codes. The paper provides values for yield stress, yield strain, ultimate strain, and elastic modulus. The standard tensile tests were conducted consistent with the requirements of ASTM D638-10. Specimens were cut in the axial direction from cell composition PE 4710 cell classification 445574C HDPE piping spools. In addition, the results are compared to previous tensile testing conducted on the PE 3608 cell classification 345464C and PE 4710 cell classification 445474C HDPE materials.
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Knapp, J. A., D. M. Follstaedt, and S. M. Myers. "Evaluating Micromechanical Properties at Surfaces Using Nanoindentation With Finite-Element Modeling." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32391.

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Detailed finite-element modeling of nanoindentation data is used to obtain accurate mechanical properties of very thin films or surface-modified layers independently of the properties of the underlying substrates. These procedures accurately deduce the yield strength, elastic modulus, and layer hardness, and greatly increase the usefulness of indentation testing with very thin surface layers. Moreover, extraction of the effective Young’s modulus in the near surface region should enable mechanical damage studies on a small scale. This paper presents a brief overview of the procedures involved and illustrates them with He-implanted Ni.
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Seibi, Abdennour, Majdi Chaari, Ahmed Temani, Mehdi Mokhtari, and Charles Taylor. "Design of a New Testing Fixture for Tangential Stress Measurements in Pipes." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72490.

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Experimental estimation of acurate material properties are key elements to the design of machine components and structures. In general, the elastic properties were determined using uniaxial tensile tests regardless of the final shape of the product including pipes, which exhibit different elastic properties in the longitudinal and tangential directions due to their manufacturing process. Several attempts have been made to estimate the mechanical properties of pipes along their longitudinal directions including ASTM D2290 and exhibited inconsistent results; thereby, calling for further design and analysis. This paper, therefore, presents various design alternatives to the ring hoop tensile test adopted in the ASTM D2290 standard through finite element modeling. The design optimization consisted of varying the ring width, dogbone width, dogbone gauge length, and the spacing between the two D-blocks to obtain the optimum values of the varying parameters that provide uniform normal stress across the cross-sectional area of the dogbone and more representative mechanical response. Finite element results revealed that the proposed dogbone sample design has an optimum length to width ratio of 4 with an orientation angle between 75° to 105° with respect to the horizontal axis. The proposed model was compared to adopted test methods such as ASTM D2290 and resulted in comparable stress contours uniformity across the dogbone gauge length but different contact pressure values. it was also found that the contact pressure for the ASTM ring hoop tensile test is higher than that for the proposed model by 22%.
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8

Sharpe, William N., Kevin Turner, and Richard L. Edwards. "Electrostatic Mechanical Testing of Polysilicon." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1273.

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Abstract Polysilicon, which is vapor deposited, is by nature only a few microns thick. In typical MEMS applications, the structural features may also be only a few microns wide. Establishing the elastic and strength properties using specimens that are similar in size is quite a challenge. This paper describes a tensile test system that grips a large ‘paddle’ on the end of a tensile specimen with electrostatic force; this enables the testing of polysilicon specimens that have cross-sections as small as 1.5 × 2 microns. Polysilicon is a linear, brittle material and it is not difficult to measure its tensile strength, which is measured here to be on the order of 1.3 GPa. It is considerably more difficult to measure Young’s modulus, and two approaches are used here. In the first, strain is extracted from the force-displacement plot of the tensile test. The second uses two gold lines for laser interferometry to measure strain directly on the tensile specimen. Both approaches yield similar results, but the measured values are lower than the 169 GPa measured earlier on wider polysilicon specimens. Specimens 3.5 microns thick had a modulus of 142 ± 25 GPa, and those 1.5 microns thick showed 136 ± 14 Gpa. The techniques and procedures along with preliminary results are presented here.
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9

Hashida, Toshiyuki, Yohei Takeyama, and Kazuhisa Sato. "The Effects of Oxygen Vacancy Concentration on the Mechanical Properties of Zirconia and Ceria-Based Electrolytes for SOFCs." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85241.

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In this paper, we discuss the effects of different oxygen partial pressures on the deformation property and fracture characteristics of representative constituent materials for solid oxide fuel cells (SOFCs). The elastic modulus and fracture strength of 8 mol% yittria stabilized zirconia (8YSZ) and 10 mol% gadolinia doped ceria (10GDC) treated under different oxygen partial pressures were evaluated using the small-punch testing method in this study. The specimens of 8YSZ and 10GDC prepared by a sintering process were treated at 800 °C under an oxygen partial pressure in the range of 0.21 to 10−22 atm for 1 hour. The treated specimens were then fast cooled down to a room temperature, and their mechanical properties were measured under an atmospheric pressure condition by using the small-punch testing method. The experimental results revealed that both the elastic modulus and fracture strength of the 10GDC decreased drastically when the oxygen partial pressure of the treatment was less than 10−15 atm, whereas no significant variation in both the mechanical properties was observed for the 8YSZ. The elastic modulus and fracture strength of 10GDC for the treatment under 10−22 atm was reduced down to 10–20% of those treated under the atmospheric pressure. SEM observations revealed that the fracture surface of the 10GDC specimens was changed from transgranular mode to intergranular mode when the oxygen partial pressure was reduced, whereas the fracture surface of the 8YSZ specimens was transgranular regardless of the different oxygen partial pressures.
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10

Li, Qiuyan, Xuande Zhang, Yuxiang Wang, and Qing-Ming Wang. "Characterization of Materials Fabricated by Additive Manufacturing Method Using Line Focused Ultrasonic Transducer." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67186.

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In this paper, we present our recent study on the characterization of the elastic properties of several metal alloys fabricated by additive manufacturing method using the line-focus ultrasonic transducer technique. Line-focused ultrasonic transducer has been used to measure leaky surface wave velocity based on the time-resolved defocusing method in recent years. Elastic properties of the materials can be calculated based on the velocities of leaky Rayleigh wave and longitudinal bulk wave, which are generated and detected by the ultrasonic transducer. In this work, a line focus ultrasonic testing system was constructed, using a PVDF thin film piezoelectric transducer, a computer controlled z-stage and a rotary stage, and data acquisition software for precision measurement of the propagation velocity of surface wave in the test materials. The transducer system was calibrated by testing the commercial stainless steel, aluminum, and copper. The surface roughness of the testing samples was measured to eliminate the possible effect on the surface wave velocity. Finally, the transducer system was used to characterize the elastic properties of specimens of nickel alloy and stainless steel which were built by additive manufacturing instruments. The results indicate good agreement with the data measured by traditional method.
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Звіти організацій з теми "Paper Elastic properties Testing"

1

Shaffer, B., K. Roney, B. Gong, H. Lim, R. McDonald, K. Rudman, Pedro Peralta, D. Frazer, and P. Hosemann. Mechanical Behavior of UO2 at Sub-grain Length Scales: Quantification of Elastic, Plastic and Creep Properties via Microscale Testing. Office of Scientific and Technical Information (OSTI), April 2018. http://dx.doi.org/10.2172/1433510.

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2

EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF STRAW BALE. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.038.

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In this paper, uniaxial compression tests of rice straw bales and plastered straw bales were conducted to study their mechanical performance under uniaxial load. The uniaxial compression test of straw bales showed that the elastic modulus of straw bales increased with the increase of the initial density of straw bales. During the compression process, the elastic modulus of straw bales gradually increased. The Maxwell model can be used to simulate the compression curve of straw bales well . The compression test of plastered straw bales shows that under the same pressure, the compression amount of plastered straw bales is much smaller than that of straw bales. The energy dissipation of straw bales is better than that of plastered straw bales. The strength and thickness of plaster are the factors affecting the strength of plastered straw bale. Reinforcement plaster can improve the strength and elastic modulus of plastered straw bale, and straw can provide effective lateral support for plaster.
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3

TESTING OF ADDITIVELY MANUFACTURED STAINLESS STEEL MATERIAL AND CROSS-SECTIONS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.175.

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Powder bed fusion (PBF) additive manufacturing has the potential for significant impact on the construction industry due to its ability to produce complex and free-form components with high-precision. However, the size of components is limited by the build envelope of PBF machines. Laser welding offers a means of joining small individual PBF parts together to create larger-scale parts. This paper investigates the microstructure and material properties of stainless steel coupons with and without laser-welded joints, in conjunction with the structural performance of stainless steel circular hollow sections (CHS) at the cross-sectional level, with all specimens printed by PBF. The PBF base material exhibited a typical cellular microstructure, while the weld material consisted of equiaxed, columnar and cellular dendrite microstructures. The proof strengths of the weld were lower than those of the base metal, and the strengths of the PBF base metal were dependent on the build direction – the vertically built coupons showed lower proof strengths than the horizontal coupons. The axial resistances of the PBF CHS are safely predicted by the EN 1993-1-4 design provisions and the deformation-based continuous strength method (CSM).
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4

SEISMIC DESIGN AND ANALYSIS OF STEEL PANEL DAMPERS FOR STEEL FRAME BUILDINGS (ICASS’2020). The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.k09.

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A ductile Vierendeel frame can be constructed by incorporating steel panel dampers (SPD) into a moment-resisting frame (MRF). The proposed three-segment SPD consists of a center inelastic core (IC) and top and bottom elastic joints. This paper introduces the mechanical properties of the SPD,and the capacity design method (CDM) of the SPD-MRF. Tests indicate that SPDs’ cyclic force vs.deformation relationships can be accurately simulated using either the Abaqus or PISA3D model analyses. The paper presents the CDM for boundary beams connected to the SPDs of a typical SPDMRF. The seismic performance of an example six-story SPD-MRF is evaluated using nonlinear response history analysis procedures and 240 ground accelerations at three hazard levels. Results indicate that under eighty maximum considered earthquake (MCE) ground accelerations, the meanplus-one standard deviation of the shear deformation of the ICs in the SPDs is 0.055 rad, substantially less than the 0.11 rad deformational capacity observed from the SPD specimens.
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5

AXIAL COMPRESSION BEHAVIOR OF SQUARE THIN-WALLED CFST COLUMN TO RC BEAM JOINTS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.288.

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To investigate the influence of eccentricity ratio and slenderness ratio on the mechanical properties of eccentric compressed concrete filled steel tubular (CFST) lattice column, the ultimate bearing capacity tests of 20 K shape arrangement lacing strip of four-tube CFST columns were conducted. Based on the stress-strain relationship of CFST and the influence of shear deformation, the equilibrium equation of the mid-section is established and a numerical method for the ultimate bearing capacity of CFST lattice column is proposed. The slenderness reduction coefficient calculation model and equivalent slenderness ratio formula of CFST lattice column are established. Combined with the numerical results and the slenderness ratio reduction coefficient calculation model, the formula of slenderness ratio reduction coefficient is put forward. The comparison between theoretical analysis and experimental results shows that the calculation method of elastic-plastic ultimate bearing capacity of CFST lattice column proposed in this paper is quite accurate. The research outcomes can provide a reference for the application of CFST lattice column and revision of current specifications.
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6

CALCULATION METHOD OF ULTIMATE LOAD BEARING CAPACITY OF CONCRETE FILLED STEEL TUBULAR LATTICE COLUMNS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.095.

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Анотація:
To investigate the influence of eccentricity ratio and slenderness ratio on the mechanical properties of eccentric compressed concrete filled steel tubular (CFST) lattice column, the ultimate bearing capacity tests of 20 K shape arrangement lacing strip of four-tube CFST columns were conducted. Based on the stress-strain relationship of CFST and the influence of shear deformation, the equilibrium equation of the mid-section is established and a numerical method for the ultimate bearing capacity of CFST lattice column is proposed. The slenderness reduction coefficient calculation model and equivalent slenderness ratio formula of CFST lattice column are established. Combined with the numerical results and the slenderness ratio reduction coefficient calculation model, the formula of slenderness ratio reduction coefficient is put forward. The comparison between theoretical analysis and experimental results shows that the calculation method of elastic-plastic ultimate bearing capacity of CFST lattice column proposed in this paper is quite accurate. The research outcomes can provide a reference for the application of CFST lattice column and revision of current specifications.
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7

LOW-TEMPERATURE COMPRESSION BEHAVIOUR OF CIRCULAR STUB STAINLESS-STEEL TUBULAR COLUMNS. The Hong Kong Institute of Steel Construction, September 2022. http://dx.doi.org/10.18057/ijasc.2022.18.3.4.

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Анотація:
This paper firstly studies mechanical properties of stainless steel (SS) S30408 at the low temperature (T) range of -80~20℃. Further compression tests are carried out on 20 SS stub tubular columns (SSSTCs) at low temperatures of -80, -60, -30, and 20℃ to investigate their low-temperature compression behaviour. Including the testing low temperatures, the wall thickness of SS tube (t) is the other investigated parameters. Test results show that decreasing the T from 20 to -80℃ improves the yield and ultimate strength of stainless steel by 29% and 80%, respectively, but reduces its ductility by about 25%. Under low-temperature compression, elephant foot local buckling occurs to most of SSSTCs and inelastic inward and outward local buckling occurred to specimens with 6 mm-thick SS tube. Test results also show that the decreasing T value increases the strength and stiffness of SSSTCs, but compromises their ductility; the wall thickness of SSSTCs significantly improves their strength, stiffness, and ductility. This paper also develops 3D finite element model (FEM) to estimate the low-temperature compression behaviour of SSSTCs, which considers nonlinearities of material and geometry, geometric imperfections, and influences of low temperatures. The validations show it predicts reasonably well the low-temperature compression behaviours of SSSTCs.
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