Academic literature on the topic 'Fillets (Engineering) Testing'
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Journal articles on the topic "Fillets (Engineering) Testing"
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Charles, H. K., and G. V. Clatterbaugh. "Solder Joint Reliability — Design Implications From Finite Element Modeling and Experimental Testing." Journal of Electronic Packaging 112, no. 2 (June 1, 1990): 135–46. http://dx.doi.org/10.1115/1.2904354.
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An extensive finite element modeling and experimental testing program has been carried out to determine the most optimum design parameters for solder joints in surface mount applications. Although the analysis and testing (power cycling and thermal cycling) has been carried out for a variety of package styles, particular attention will be paid to the result for leadless ceramic chip carriers. This package is particularly useful in certain high performance military and commercial applications. Analysis and experimentation indicate that increased fatigue life under power cycling can be attained by fabricating solder joints with large fillets and low standoff heights. The large fillet geometry significantly reduces harmful stress concentrations while increasing the net cross-sectional area within the joint. Both factors tend to improve the fracture toughness of the joint. The temperature and frequency dependencies of solder joint fatigue life under power cycling testing is discussed. The observed frequency dependence can be minimized by eliminating harmful tensile strain components thus reducing harmful stress relaxation and tensile induced oxygen embrittlement of grain boundaries. Temperature cycling studies indicate joints with slightly higher standoffs and low fillet angles are more resistant to cyclic fatigue than pillar type joints which tend to focus shear strains at the interfaces. Solder joints can be tapered to improve overall reliability but, in most cases, tapering will provide only a small increase in fracture toughness of the joint through the elimination of stress concentrations. Additional fatigue life increases can be obtained only through an enlargement of the joint cross-sectional area. Aspects of the above results will be presented in detail along with design guidelines for creating high reliability solder joints for various application scenarios.
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Capineri, L., G. Dainelli, M. Materassi, and B. D. Dunn. "Partial discharge testing of solder fillets on PCBs in a partial vacuum: new experimental results [Abstracts of Forthcoming Manuscripts]." IEEE Transactions on Electronics Packaging Manufacturing 26, no. 4 (October 2003): 265. http://dx.doi.org/10.1109/tepm.2003.823164.
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Woo, Seongwoo, Dennis L. O’Neal, Yury G. Matvienko, and Gezae Mebrahtu. "Enhancing the Fatigue of Mechanical Systems Such as Dispensers Entrenched on Generalized Life-Stress Models and Sample Sizes." Applied Sciences 13, no. 3 (January 19, 2023): 1358. http://dx.doi.org/10.3390/app13031358.
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To lengthen the life of a mechanical system, parametric accelerated life testing (ALT) is recommended as an established way to help identify structural imperfections and reduce fatigue-related failures. It involves (1) a parametric ALT scheme, (2) fatigue design, (3) ALTs with alterations, and (4) an estimate of whether design(s) achieve the BX lifetime. The application of a quantum-transported time to failure prototype and a sample size expression is also suggested. The improvements in the reliability of a water dispenser made of stainless steel or polypropylene (PP) in a bottom-mount domestic refrigerator was used as a case study. In the first ALT, the hinge and front corner of the dispensing system was cracked. The water dispenser lever was altered by increasing the thickness of its ribs and fillets. In the second ALT, the altered dispensing lever system cracked because there was an insufficient thickness in its front corner for impact loading. The critical design factors for improving reliability were corner fillet rounding and rib thickening in a dispenser lever. As there were no difficulties in the third ALT, the dispenser life was verified to have a B1 life of 10 years.
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Saritha, A., Joseph Kuruvilla, and Thomas Sabu. "Design, Development and Testing of Rubber Nanocomposites." Key Engineering Materials 425 (January 2010): 61–93. http://dx.doi.org/10.4028/www.scientific.net/kem.425.61.
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This review aims at reporting on very recent developments in the synthesis, properties and (future) applications of rubber nanocomposites. Nanocomposites are the materials for the future, which have improved mechanical properties. Reinforcement is especially important for the application of elastomeric materials because the mechanical strength of unfilled elastomers is generally poor. Commonly isometric fillers like carbon black or fumed silica are used for reinforcing elastomers.Rubber nanocomposites play an important role in engineering, construction and aerospace applications. This new family of materials exhibit enhanced properties at very low filler level, usually ≤ 5 wt %. Rubber nanocomposites exhibit very good Young’s modulus , storage modulus, thermal stability , gas barrier properties and flame retardancy.
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Abas, Falak O., and Raghad Usama Abass. "Study thermo-mechanical properties of polyester composite reinforced by ceramic particles, SiC." MATEC Web of Conferences 225 (2018): 01021. http://dx.doi.org/10.1051/matecconf/201822501021.
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Development of the Polymer Composites with natural fibers and fillers as a sustainable alternative material for some engineering applications, particularly in aerospace applications and automobile applications are being investigated. Lightweight and biodegradability and low cost Polyester composites are synthesised with an addition of Silicon carbide (SiC) particles by varying weight percentage (0, 3, 6, 10, 13, and 16 wt. %) respectively by using hand- layup technique followed by cold moulding. The prepared specimens were cut according to ASTM standard to determine hardness, impact strength, bending distortion and thermal conductivity properties. Afterward, the thermal and mechanical properties of all the unfilled and particulate filled composites are also evaluated for structural applications, i.e., hardness, impact strength, bending distortion, are determined with the change in filler content to notice the behaviour of composite material subjected to loading in addition to thermal conductivity property. Thermo-mechanical properties of the material are measured with the help of testing machines above according to their ASTM. It is found that the strength properties are greatly influenced by addition of this ceramic filler. Also shows that the thermal and mechanical properties of SiC-filled polyester composites are better than unfilled base composites
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Guan, Jun Fang, Hui Qun Yang, Yan Qiang Yu, Yang Chen, Guo Bing Yang, Hui Min Gao, and Ling Yan Zhang. "Reinforcement of Natural Rubber with Quartz/Sericite/Wollastonite." Advanced Materials Research 239-242 (May 2011): 2953–57. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2953.
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In the paper, ultrafine quartz, sericite and wollastonite modified with silane coupling agents KH-570 were incorporated into natural rubber(NR). The synergisitc effect on reinforcing NR caused by the three types of fillers was investigated under a same vulcanizing formulation and process. The mechanical properties and microstructure of the vulcanizates were conducted through mechanical testing and scanning electron microscopy(SEM). The results of mechanical properties tests showed that when one of these three fillers was loaded within NR alone, the tear strength and permanent set of NR vulcanizates filled with quartz could reach 27.61 kN m-1and 16.0%, respectively, stress at 300% elongation of NR vulcanizates filled with sericite could attain 4.69 MPa, and the tensile strength and elongation at break of NR vulcanizates filled with wollastonite could get to16.64 MPa and 951.21%, respectively. Under the condition that the filler loadings were 40 parts per hundred parts of rubber(phr), and the mass ratio of quartz, sericite, wollastonite was 1:1:3, the tensile strength and tear strength could come up to 17.33MPa and 27.54 kN m-1. The mechanical properties of NR composites filled with mixtures were found to be complemented by those three types of minerals. SEM results revealed that the fillers are well dispersed in the rubber matrix in the parallel arrangement with a densest stack, and the synergistic reinforcment effect of the fillers on NR was obvious.
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Smith, Benjamin J., and Simon A. M. Hesp. "Crack Pinning in Asphalt Mastic and Concrete: Regular Fatigue Studies." Transportation Research Record: Journal of the Transportation Research Board 1728, no. 1 (January 2000): 75–81. http://dx.doi.org/10.3141/1728-11.
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The effects of finely dispersed fillers on the fatigue performance of asphalt binders and asphalt concrete mixes at relatively low temperatures are examined. A series of model binder systems containing glass spheres with narrow particle size distributions were used to study the effect of filler particle size on the fatigue performance of the asphalt mastic. Two mastic systems containing ground limestone fillers, which possessed significantly different gradations, also were tested. Fatigue performance was evaluated by applying a constant torsional strain to each specimen in a dynamic rheometer at 10°C and 40 Hz. Testing at various strain levels allowed the relationship between fatigue life and strain to be determined for the different systems. The results indicate that as the particle size of the filler decreases, the fatigue life of the asphalt mastic increases. This observation is a direct result of the mode of fatigue failure in the asphalt mastics and is in agreement with Evans’s theory on crack pinning for failure in filled brittle solids. Constant stress asphalt concrete fatigue tests on both dense- and gap-graded systems prepared with the two different ground limestone fillers show that the particle size does not significantly affect the fatigue life of the mixes. These results also confirm that crack pinning is the major mechanism responsible for improved fatigue performance.
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Mohammad, Louay N., Chris Abadie, Rana Gokmen, and Anand J. Puppala. "Mechanistic Evaluation of Hydrated Lime in Hot-Mix Asphalt Mixtures." Transportation Research Record: Journal of the Transportation Research Board 1723, no. 1 (January 2000): 26–36. http://dx.doi.org/10.3141/1723-04.
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Permanent deformation and moisture damage are common distresses found in pavements today. The use of mineral fillers such as hydrated lime is known to provide a decrease in moisture susceptibility. In many cases, mineral fillers will also increase the mixture stiffness. Conventional asphaltic concrete mixtures and mixtures modified with hydrated lime were evaluated for their fundamental engineering properties as defined by indirect tensile strength and strain, permanent deformation characteristics, resilient modulus, and fatigue resistance. A typical Louisiana low-volume dense-graded mixture was used. The test factorial included two aggregate types (limestone and gravel) and two asphalt cement types (a conventional AC-30 and one modified with styrene-butadiene polymer). The results indicated that the addition of hydrated lime as mineral filler improved the permanent deformation characteristics and fatigue endurance of the asphaltic concrete mixtures. This improvement was particularly apparent at higher testing temperatures with mixes containing polymer-modified asphalt and limestone aggregate.
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Frank, Nyorere, and Emu Alfred. "FLEXURAL PROPERTIES OF WOOD SAWDUST AND OIL BEAN POD SHELL FILLED COMPOSITE." International Journal of Research -GRANTHAALAYAH 6, no. 11 (November 30, 2018): 337–44. http://dx.doi.org/10.29121/granthaalayah.v6.i11.2018.1136.
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Composites reinforced with natural materials play a vital role in engineering applications, like the fabrication of automobile parts, furniture making, etc. The objective of this present research is to determine the flexural properties (flexural strength, flexural energy) of oil bean pod shell (OBPS) and hardwood sawdust (SD) reinforced composite in epoxy matrix, at different filler loading. Hybridized composite samples used for this research were prepared with 20, 25, 30, 35, and 40% filler (SD and OBPS in the ratio of 1:1) reinforcements in the ratio of 1:1. The flexural test was conducted on the samples according to ASTM D-790, using the Universal Testing Machine. From the results obtained, the fillers loading had significant (P ≤0.05) effect on the three flexural properties studied. The flexural strength increased from 33.44 to 67.65 MPa, the flexural energy increased 53.1%, while the flexural yield strength increased from 23.58 to 55.4 MPa. The results obtained from this research will be helpful the automobile and construction companies.
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Mogawer, Walaa S., and Kevin D. Stuart. "Effects of Mineral Fillers on Properties of Stone Matrix Asphalt Mixtures." Transportation Research Record: Journal of the Transportation Research Board 1530, no. 1 (January 1996): 86–94. http://dx.doi.org/10.1177/0361198196153000111.
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Stone matrix asphalt (SMA) is a gap-graded hot mixture that has higher proportion of coarse aggregate, lower proportion of middle-size aggregate, and higher proportion of mineral filler than a dense-graded mixture. Because of the high quantity of mineral filler, the type and quantity of this fraction should play a major role in the properties of these mixtures and their mastics. Determination of whether mastic and mixture properties can distinguish good mineral fillers from bad ones is the objective. Eight mineral fillers with known performance were obtained from three European countries. Mastics were tested for stiffness using a bending beam rheometer (AASHTO TP1), a dynamic shear rheometer (AASHTO TP5), and softening point of bitumen using the ring-and-ball apparatus (AASHTO T53-92). None of the tests distinguished among mastics with good and bad mineral fillers. Mixtures were tested for draindown of mastic using the National Center for Asphalt Technology draindown test, rutting using the French pavement rutting tester, low-temperature cracking using the indirect tensile test, workability using the U.S. Corps of Engineers gyratory testing machine, and moisture susceptibility using the ASTM D 4867 method. None of the tests distinguished among SMA mixtures with good and bad mineral fillers.
Dissertations / Theses on the topic "Fillets (Engineering) Testing"
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Mahmood, Salih Qasim. "Behavior of Lap Shear Connections with Thermally Insulating Filler Plates." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/4159.
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This research consists of experimental load tests and numerical simulations of structural steel connections with various filler materials to study the effect of non-steel fillers on the connection strength. Non-steel fillers are used in the steel connections to provide thermal insulation by reducing thermal bridging. Eight specimens having steel and polypropylene filler plates of various thicknesses were tested in the laboratory. The collected data were compared to a Finite Element Analysis (FEA) using ABAQUS to validate the numerical results. After validation, three parametric studies were conducted using ABAQUS to provide insight into general behavior of connections with a variety of fillers that could be used as thermal breaks. In addition, an extreme case of having air gaps instead of alternative fillers was also considered.
The Research Council on Structural Connections (RCSC 2014) suggests a reduction in the bolt shear strength when undeveloped fillers with a thickness of more than 0.25 inch are used while using any non-steel material is prohibited due the limited research available.
Most research studies have investigated the mechanical behavior of thermal breaks in either end-plate moment connections or slip-critical connections. No data is available for thermal breaks in bearing-type connections up to failure.
This research aims to study the effects of filler material properties such as modulus of elasticity and strength on bolt strength, as well as investigate whether the current equation in RCSC 2014 is applicable for alternative filler materials like polypropylene that has less than 0.5% of the steel modulus of elasticity and less than 10% of steel strength.
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Smuga, Jonathan R. "Conductively filled Poly(methyl methacrylate) composites : manufacture and testing processes for EMI shielding effectiveness." Thesis, Edinburgh Napier University, 2012. http://researchrepository.napier.ac.uk/Output/5426.
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Electromagnetic interference (EMI) is an escalating concern in the modern electronic climate. As such it has become a critical area to consider when designing and packaging electronics. With the growing volume of electronic devices available and with processor frequencies increasing, the electromagnetic environment is becoming ever more congested. The need for adequate EMI shielding has become an essential consideration. The desire for high performance combined with reductions in size, weight and manufacturing cost suggests that polymers should be ideal materials for parts such as electronic housings. Unfortunately polymers generally do not provide shielding from electromagnetic waves. The research detailed in this thesis investigates the manufacture and testing of conductively filled poly(methyl methacrylate) (PMMA) composites. Samples of PMMA resin and various electrically conductive filler materials were manufactured. The processing methods, electrical properties and electromagnetic behaviour were all investigated. Composite polymer coatings were printed with a K-Control Coater and evaluated for surface resistivity and EMI shielding effectiveness. Samples were produced with a range of filler materials including nickel, carbon, copper/aluminium and silver coated glass spheres. Shielding effectiveness values of approximately 70 dB were obtained for coatings of PMMA filled with silver coated hollow glass microspheres. Attempts were made to produce an alternaalternative filler material by electroless nickel plating of expanded graphite powder. Successful plating was achieved using conventional methods of surface sensitisation of the graphite. This however resulted in agglomerations of the powder and a loss of the desired physical properties. Alternative thermal surface treatments proved to be unsuccessful in activating the graphite surface with no nickel deposition occurring. Furthermore, electroless nickel plating techniques were successfully utilised in the development of an alternative manufacturing process for producing electrically conductive PMMA composites which contained a reduced metallic content, in relation to a more traditional production technique. Plaques were manufactured by compression moulding of nickel plated PMMA granules. These were compared against samples manufactured with nickel powder mixed in a Brabender Plasti-Corder. The electroless plating method produced samples that outperformed the comparative method and were shown to contain a reduced metallic content. Shielding effectiveness of the electroless plated granule samples achieved approximately 34 dB compared to a maximum of only 2.5 dB for the Brabender compounded samples. Outwith these areas of empirical testing a computer model was produced to simulate the electromagnetic shielding behaviour of composite materials using Comsol Multiphysics. This model appears to successfully simulate the waveguide testing apparatus. However the theoretical conductivity values as calculated from effective media theory resulted in disproportionate shielding effectiveness values obtained. Further research into the electroless plated and compression moulded PMMA composites would be beneficial in order to fully optimise the process. Equally the theoretical model would require further investigating and validating before more accurate simulations could be achieved.
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Burger, A. F. "Rheology of polymer modified binders : a comparative study of three binders and three binder/filler systems." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52438.
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Thesis (MEng)--University of Stellenbosch, 2001.ENGLISH ABSTRACT: The use of polymer modified binders have increased drastically over the past twenty years. It is generally accepted that current empirical specification tests do not adequately characterise the improvement in binder properties when bitumen is modified with polymers. At the University of Stellenbosch, a programme was initiated to relate binder properties to asphalt mix performance. This study forms part of that programme. This study focuses on three binders and is an attempt to characterise binder properties fundamentally. The binders that were tested are: • 60/70 penetration grade bitumen • SBS modified 60/70 bitumen • Bitumen-Rubber Two rheometers were used to characterise the binder properties: • Sliding Plate Rheometer (SPR) • Dynamic Shear Rheometer (DSR) The Sliding Plate Rheometer was modified to allow testing at elevated temperatures. The modification is described in this thesis. Three types of testing were used to test the binders: • Creep tests (SPR and DSR) • Dynamic tests (Strain and Frequency Sweeps - DSR) • Flow tests (high temperature viscosity tests - DSR) The results of the tests were used to characterise differences between the binders. Shear susceptibility lines were plotted and viscosities calculated from the creep test results; Master Curves and Black Diagrams were plotted from frequency sweep results; flow test results were used to characterise high temperature behaviour. A further development in the asphalt industry is the move towards the development of performance based specifications. A programme has been initiated in this regard and this study forms part of the programme. As a step towards the development of performance based specifications filler was included in this study. BinderlFiller systems were subjected to the same test programme the binders were, to characterise the influence on binder properties of filler addition. Some of the conclusions that were drawn at the end of the study are: • Polymer modification improves binder properties related to rutting. • Filler addition does not affect binder properties negatively. • Shear rate is very important during production of asphalt mixes and construction of asphalt layers containing polymer modified binders.
AFRIKAANSE OPSOMMING: Die gebruik van polimeer gemodifiseerde bitumen het drasties toegeneem oor die afgelope twintig jaar. Dit word algemeen aanvaar dat die huidige empiriese spesifikasie toetse nie die verbetering in bindmiddeleienskappe van polimeer modifisering aanvaarbaar karakteriseer nie. 'n Program is geïnisieer by die Universiteit van Stellenbosch om 'n verband te vind tussen bindmiddeleienskappe en asfaltmengseleienskappe. Hierdie studie vorm deel van die program. Hierdie werk fokus op drie bindmiddels en is 'n poging om die bindmiddeleienskappe fundamenteel te karakteriseer. Die bindmiddels wat gebruik is in hierdie werk, is: • 60/70 penetrasiegraad bitumen • SBS gemodifiseerde 60/70 bittimen • Bitumen-Rubber Twee reometers is gebruik om bindmiddeleienskappe te karakteriseer: • Glyplaat Reometer (SPR) • Dinamiese SkuifReometer (DSR) Die glyplaat reometer is aangepas om toetse by hoër temperature te doen en die aanpassing wat gemaak is word in die tesis beskryf. Drie tipes toetse is uitgevoer om die bindmiddels mee te toets: • Kruiptoetse (SPR en DSR) • Dinamiese toetse (DSR) • Vloei toetse (DSR) Die resultate van die toetse is gebruik om die verksille tussen die bindmiddels te kwalifiseer. Verskillende grafieke en figure is getrek van die resultate om die onderskeie bindmiddels te karakteriseer. Die beweging weg van empmese spesifikasies na werkverrigting gebaseerde spesifikasies in die asfalt industrie is 'n verder nuwe ontwikkeling. 'n Program is geïnisïeer ten opsigte hiervan en hierdie werk vorm deel van die program. As 'n stap in die ontwikkeling van die werkverrigting gebaseerde spesifikasies is 'n vuIler ingesluit in die toetsprogram. Bindmiddel/vuIler stelsels is onderwerp aan dieselfde toetse waaraan die bindmiddels onderwerp is om die invloed van die vuIler op die bindmiddels te karakteriseer. Sommige van die gevolgtrekkings waartoe gekom is aan die einde van die tesis, is: • Polimeer modifisering verbeter bindmiddeleienskappe met betrekking tot wielsporing. • Die toevoeging van vuIler affekteer nie die bindmiddeleienskappe negatiefnie. • Die vervormingstempo is van groot belang wanneer asfaltmengsels gemeng en lae gebou word van mengsels wat polimeer gemodifiseerde bitumen bevat.
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Marson, Julia Elizabeth. "Cyclic testing of concrete-filled circular steel tube bridge columns having encased fixed-based detail." Thesis, University of Ottawa (Canada), 2000. http://hdl.handle.net/10393/9331.
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Concrete-filled steel tube columns have been recognized to have many desirable characteristics that can lead to stable hysteretic energy dissipation during earthquakes. They also have many other properties that make them advantageous for bridge applications (i.e. steel tube provides confinement to the concrete and acts as formwork during construction; concrete enhances the local buckling resistance of the steel tube; construction can be accelerated when the tube alone can carry the dead-loads; no need for stain protection on piers when superstructure is of weathering steel; final aesthetic of the product compatible with current practice, etc.). A literature review was performed to collect data on the behaviour of concrete-filled steel tubes under axial load, combined axial and bending forces, and cyclic forces. Analytical work was performed to ensure that the test columns chosen would be representative of full-scale bridge piers found in North America. The foundation detail was designed to ensure that the full moment capacity of the composite column could be developed at its base without failure of the foundation. This study involved testing four concrete-filled steel tubes under a constant axial load and subjected to an increasing cyclic horizontal force applied at the top of the column. All four columns sustained drifts of 7% before failure occurred by the steel tube fracturing at the location of the local buckles. Subsequent analytical work lead to two new proposed design equations. These produce axial-flexure interaction equations in much better agreement with the existing data than the equations for circular concrete-filled steel tubes currently used by the Canadian CAN/CSA-S16.1-M94 standard, or American AISC LRFD 1994 Specifications.
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Marquina, Edgar Alberto. "Use of Dynamic Mechanical Testing, WAXD and SEM Image Analysis to Study the Properties of Polypropylene/Calcium Carbonate Nanocomposites." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1269363578.
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Valentine, Todd J. "Dynamic Testing of a Full-Scale Pile Cap with Dense Silty Sand Backfill." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2021.pdf.
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Bhadriraju, Vamsi Krishna. "ENZYME-BASED PRODUCTION OF NANOCELLULOSE FROM SOYBEAN HULLS AS A GREEN FILLER FOR RUBBER COMPOUNDING." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1606941104724784.
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Kuper, Michael W. "Investigations Near the Fusion Boundary of Grade 91 Steel Dissimilar Metal Welds with Nickel Based Filler Metals." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543505600533312.
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Clark, W. S. "Axial load capacity of circular steel tube columns filled with high strength concrete." Thesis, 1994. https://vuir.vu.edu.au/18153/.
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This study examines the axial load capacity of circular Concrete Filled Steel Tube
columns using High Strength Concrete (CFST-HSC). Emphasis is drawn to the
enhanced axial capacity of short columns attributed to the lateral confinement of the
concrete infill provided by the steel encasement. The degree of confinement has been
found to be dependent on several geometric and mechanical parameters. At present,
significant discrepancies exist with respect to quantifying the effective strength confined concrete. Existing design models and codes are predominantly derived from
the characteristics of normal strength concrete and therefore may be inappropriate concrete filled steel columns utilising High Strength Concrete (HSC).
An extensive experimental program was initiated to examine the axial capacity of
CFST-HSC columns. The results of 62 concentrically loaded scale model columns filled
with High Strength Concrete (46-100 MPa) are presented. The principal experimental
parameters were concrete and steel strengths, tube diameter to wall thickness ratio, column slenderness ratio. The columns tested were classified as short thin walled
sections and were tested as isolated column elements under short term loading. The
results are compared with the predictions of several existing design procedures and
recommendations are proposed.
Book chapters on the topic "Fillets (Engineering) Testing"
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Kahraman, Ramazan, and Mamdouh Al-Harthi. "Testing and Modeling of Moisture Diffusion Into Aluminum Particle Filled Epoxy Adhesive." In Experimental Analysis of Nano and Engineering Materials and Structures, 811–12. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_403.
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Jones, G. R., M. Seeger, and J. W. Spencer. "Gas-filled interrupters - fundamentals." In High Voltage Engineering Testing, 275–302. Institution of Engineering and Technology, 2013. http://dx.doi.org/10.1049/pbpo066e_ch7.
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Jones, G. R. "Gas filled interrupters - fundamentals." In High Voltage Engineering and Testing, 273–300. Institution of Engineering and Technology, 2001. http://dx.doi.org/10.1049/pbpo032e_ch7.
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Benham, Robert, and Fayyaz Rehman. "A Comparison of the Effects of Stress Concentrations in Laser-Cut PMMA Under Static and Centripetal Loading." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220587.
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A number of studies have looked how resultant stress concentrations in designs can have a detrimental effect on finished parts. Recently student projects at Solent University experienced issues with uncertainty in stress concentrations from laser cutting of polymeric materials. This study looks at conventional tensile testing to evaluate PMMA (acrylic) subjected to tensile testing, varying the presence of fillet radii on section changes, and compare the findings to finite element analysis (FEA) models. In addition, parts are tested under centripetal loading to compare the effects of stress concentrations when a component is subjected to centripetal force and angular acceleration, in the form of a horizontal fan blade. The centripetal testing will avoid the effects of impulse on specimens but allow comparisons to be drawn between physical testing (with limited controlled variables) using a motor hub and FEA results. The findings will be used in teaching undergraduates and also help with future student projects.
Conference papers on the topic "Fillets (Engineering) Testing"
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Jhala, R. L., and S. S. Khandare. "Comparative Study on Evaluating Fatigue Performance of Forged Steel Versus Different Material Automotive Component." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39908.
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The overall objective of this paper is to compare and evaluate the fatigue performance of two competing manufacturing technologies for automotive component, namely forged steel and cast iron steering knuckle. The paper details the different experimental evaluation, mechanical properties and performance of two materials and components, their results for the steering Knuckle. Fatigue is the primary cause of failure of component due to the cyclic loading and presence of stress concentrations at the fillets and critical areas. The steering knuckle consisted of mainly sections namely spindle, strut mounting holes and hub mounting attachments. The masses of both steering knuckle were similar with the forged steel at 4.8 kg and the cast iron at 4.5 kgs. Also, the failure location of the steering knuckle used in this study was in the first step and second step fillet, which agrees with the typical failure location for an automotive steering knuckle. The paper concludes that the crack growth life for both steering knuckle was a significant portion of the fatigue life during the steering knuckle testing. The crack growth rate of the forged steel steering knuckle was slower than the cast iron steering knuckle. During steering knuckle fatigue tests, circumferential cracks developed in the first step and second step fillet of both forged steel and cast iron steering knuckles which was identified as the critical location from FEA.
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He, K., and W. D. Zhu. "Damage Detection of Space Frame Structures With L-Shaped Beams and Bolted Joints Using Changes in Natural Frequencies." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48982.
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It is difficult to use conventional non-destructive testing methods to detect damage, such as loosening of bolted connections, in a space frame structure due to the complexity of the structure and the nature of the possible damage. A vibration-based method that uses changes in the natural frequencies of a structure to detect the locations and extent of damage in it has the advantage of being able to detect various types of damage in the structure, including loosening of bolted connections. Since the vibration-based method is model-based, applying it to a space frame structure with L-shaped beams and bolted joints will face challenges ranging from the development of an accurate dynamic model of the structure to that of a robust damage detection algorithm for a severely under-determined, nonlinear least-square problem under the effects of relatively large modeling error and measurement noise. With the development of the modeling techniques for fillets in thin-walled beams (He and Zhu, 2009, “Modeling of Fillets in Thin-Walled Beams Using Shell/Plate and Beam Finite Elements,” ASME J. Vibr. Acoust., 131(5), p. 051002) and bolted joints (He and Zhu, “Finite Element Modeling of Structures with L-shaped Beams and Bolted Joints,” ASME J. Vibr. Acoust., p. 011010) by the authors, accurate physics-based models of space frame structures can be developed with a reasonable model size. A new damage detection algorithm that uses a trust-region search strategy combined with a logistic function transformation is developed to improve the robustness of the vibration-based damage detection method. The new algorithm can ensure global convergence of the iterations and minimize the effects of modeling error and measurement noise. The damage detection method developed is experimentally validated on an aluminum three-bay space frame structure with L-shaped beams and bolted joints. Three types of introduced damage, including joint damage, member damage, and boundary damage, were successfully detected. In the numerical simulation where there are no modeling error and measurrement noise, the almost exact locations and extent of damage can be detected.
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Clarke, Matthew A., Narcrisha S. Norman, and Sonya T. Smith. "Hybrid-MCX-1, BWB and 777 Aircraft Comparison." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52526.
Full textAbstract:
Conceptual design is the first and most important phase of an aircraft’s configuration and system development process. That being said, there is no denying that innovation in aviation has stunted over the last 50 years; the once every present fascination of flying has been blanketed by the rapid profit-driven commercializing of an industry. Moreover, we have reached an apex of maximizing the efficiency of current passenger aircraft model configurations. In recent times, new research and development has culminated to the introduction of aerodynamic structures to address key issues such as stability and fuel efficiency. This research paper seeks to push the envelope of innovation with a brand new perspective on how we view air travel — redefining the Why, What and How. It explores novel concepts such as Boeing Blended Wing Body (BWB) aircraft shown in, which does not follow the conventional Tube and Wing (TAW) configuration. It is a tailless design that integrates the wing and the fuselage into a single-lifting surface. The most common advantages include a higher lift-to-drag ratio and higher payload capacity due to a distribute load along the centerline of the aircraft. On the other hand, a tailless configuration comes at a cost to in-flight maneuvering and stability. The unique design of the Hybrid-MCX-1 aircraft involves the application of the active aero-elastic tailoring to aircraft topology optimization for both subsonic and transonic regimes. With a focus on experimental wind tunnel testing and high-fidelity simulations, this project proposes a new concept that deviates from today’s tubular and wing concept. The aircraft has a unique shape with a forward fuselage that starts off with the conventional tubular and winged aircraft design currently flown in commercial travel, but deviates to a wider cross section at the center of the fuselage. The model has self-supporting, cantilever, dihedral, swept wings, with pronounced fillets at the junction of the wing root and fuselage, blending them smoothly. This smooth transition reduce interference between airflow over the wing root and the adjacent body surface, ultimately reducing drag. The engines of the Hybrid-MCX-1 are mounted by at 45-degree angle on the rear of the plane. This engine location offers the opportunity for swallowing the boundary layer of air from that portion of the center body upstream of the inlet, providing improved propulsive efficiency by reducing the ram drag. The Hybrid-MCX-1 also possesses a vertical tail that bisects the engines. As with current commercial aircraft, this tail provides lateral stability and controls the yaw. In the case of the BWB, yaw control is made possible by sweeping the wing and downloading the wingtips. However, this approach reduces the effective aerodynamic wingspan of the aircraft and imposes a significant induced drag penalty. The presence of a tail on the concept model addresses the aforementioned issue and rectifies unwanted yawing that may arise during cross wind flight conditions. The rear end of the aircraft decrease significantly in vertical thickness when compared to the lateral thickness to minimize the possibility of flow separation as air passes around the wings and over the front half of the aircraft while maximizing total lifting surface area. The pylons are adequately sized to avoid aerodynamic interference between fuselage, pylon and nacelle but still relatively short to minimize drag.
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Vladov, M. L., and A. N. Oshkin. "Case of Study of Seismo-acoustic Testing of Water-filled Boreholes in Engineering Geology." In Saint Petersburg 2008. Netherlands: EAGE Publications BV, 2008. http://dx.doi.org/10.3997/2214-4609.20146896.
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Al-Haik, Marwan, Shane Trinkle, Hartono Sumali, Daniel Garcia, Fan Yang, Ulises Martinez, and Scott Miltenberger. "Investigation of the Nanomechanical and Tribological Properties of Tooth-Fillings Materials." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42975.
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This study utilizes novel characterization techniques nanoindentation and nanoscratch for testing both the human enamel and dentine together with two biocompatible dental filling materials; epoxy nanocomposite and silver amalgam. Nanoindentation tests were performed to obtain accurate hardness and reduced modulus values for the enamel, dentin and two different fillers. We utilized Nano-scratch tests to obtain critical load in scratch test and resistance to sliding wear. Testing showed the silver amalgam filling has a higher modulus of elasticity, hardness and wear resistance compared to the nanocomposite. The novel mechanical characterization techniques utilized might assist in better understanding the mechanical behavior of the dental fillers and thus facilitate the design of robust fillers with excellent mechanical properties.
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Nixon, Jason R., and David I. Bigio. "Effects of Variable Fiber Microstructure in Composite Fused Filament Fabrication on Physical Properties Using High Aspect Ratio Short Fibers." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51903.
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Polymeric fused filament fabrication technology (FFF), a subfield within additive manufacturing (AM), is becoming a contender for the reintroduction of the small-scale manufacturing of customized consumer products to a mass-production dominated world market. However, before this technology can be widely implemented, there remain significant technological hurdles to overcome. One issue that has been addressed at great length in other traditional polymer manufacturing fields is the inclusion of fillers in the component for physical property enhancement or the introduction of entirely new properties to the matrix material. Experiments conducted in this study examined the inclusion of carbon microfibers (CMFs) into the matrix material prior to the printing process, and the effect of different processing parameters on the final filler structure of the composite parts post printing. Prior work on microstructural evolution during extrusion in a 3D printer has been conducted computationally to study the effects of extrusion rate, matrix rheology, and nozzle geometry on fiber orientation [1]. It was found that varying the nozzle geometry generated significantly different microstructures, and that the remainder of the parameters could be varied to fine-tune microstructural characteristics. Findings indicated that, by varying the nozzle geometry from a converging to a diverging conical section, microstructures ranging from axially oriented (with respect to the extrusion direction) to radially oriented are theoretically possible. Current work performed on extruders and FFF platforms indicates that during the extrusion process, fibers tend to align very closely to the axis of extrusion in shear flow (i.e. converging or straight dies). However, in some applications, this may not be the most effective filler structure for property enhancement, so there remains interest in exploring methodologies for fiber rotation during extrusion. For this study, CMFs and acrylonitrile butadiene styrene (ABS) were compounded using a 28mm fully-intermeshing co-rotating twin-screw (CoTSE) extruder. 3D printer feedstock was manufactured in-house. A range of concentrations from 0%wt to 15%wt fabricated and tested. Analysis of the feedstock indicated nearly axial fiber alignment post-manufacture. This feedstock was then used in a Lulzbot TAZ4 printer to manufacture composite tensile testing specimens. Printed composite properties were then identified and compared to neat ABS and bulk composite properties. It was found that using a purely converging die, highly aligned filler structures were produced (with respect to the bead laid by the printer). Using a diverging nozzle, more random filler structures were produced. Improvements in both intra-layer properties were observed using the diverging nozzle geometries to reorient fibers during extrusion. Property improvements were not found to be as high as longitudinal properties for highly aligned filler structures. Using insights gained through these experiments, we are currently working on exploring added functionality for the composites using different types of fillers as well as multi-scale filler combinations.
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Bergan, Pa˚l G., Inge Lotsberg, Wolfgang Fricke, Michel Franc¸ois, and Henryk Pisarski. "Overview of the FPSO: Fatigue Capacity JIP." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28538.
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This paper presents an overview of a joint industry project carried out in the period 2001 – 2003 to address the Fatigue Capacity of FPSOs. Numerical investigations and fatigue testing is performed in order to improve the accuracy, robustness and efficiency of finite element modeling and hot spot stress evaluation for typical FPSO details. Design criteria will be developed for fatigue crack growth from the root of fillet welds in typical details in FPSOs including fillet welds around attachments and fillet welds around pipes penetrating deck plates. Fatigue analysis methods for FPSOs with guidelines on determination of side pressures in the water line will be developed. This work will be supported by assessment of actual measurement data from the field and testing in a tank. Methods for planning in-service inspection of FPSOs based on a fracture mechanics and reliability analysis will be developed. Also a procedure for repair of a fatigue crack while the FPSO is on station in the field will be developed.
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Vargas, Pedro M., Steven Altstadt, and Max Lewis. "Fatigue and Strength Performance of Underwater Fillet Welds and Broco® Underwater Cutting Edges." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-62235.
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This paper presents the results of fatigue and strength tests for: 1) cruciform joints with the fillet welds performed underwater, and 2) test coupons with one sided cut by Broco® underwater cut. The laboratory testing was conducted in air. The results show that the under-water fillet welds can have root cracking. For large root cracks this results in fatigue performance that is lower than the equivalent in-air welds without root cracks. In the absence of root cracks the DNV [3] approach for cruciform joints is shown to be applicable. The Broco® underwater cut edge cuts performed above the DNV category F3 [3] fatigue performance for the in-air environment, but below the F1 category. Hardness testing on the cut edge heat affected zoned surface showed values as high as 38 HRC. This is typically a concern for hydrogen stress cracking in offshore environments, and thus the using any category above the F3 curve likely is not justified. For in air testing the strength of the underwater welds and the Broco® underwater cut edges showed no appreciable strength reduction vs. what would be expected from conventional flame cut edges.
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Otremba, Frank, and José A. Romero Navarrete. "Lateral Load Transfer due to Sloshing Cargo in Partially Filled Containers." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10030.
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Abstract The interaction of the liquid cargo and its carrying vehicle has been a common research subject, aiming at clarifying the potential effects of the mobility characteristics of such type of cargo, on the overall safety performance of the vehicle. While there has been extensive research on this topic, including both experimental and theoretical approaches, the comparative experimental testing of sloshing and non-sloshing cargoes has been only limited. In this paper, a scaled-down testing device that operates under the principles of a tilt table, is described and used to comparatively assess the effects, of a sloshing and non-sloshing cargo, on the lateral load transfer in the vehicle, as a function of the fill level and of the rate at which the lateral acceleration input is exerted on the vehicle-cargo system. Results suggest that the sloshing cargo generates greater load transfers, regardless of the fill level and acceleration rate input. As an average, the sloshing cargo generates a 14.75% greater load transfer.
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Huo, Jin, Zirong Hu, and Yuping Sun. "Modeling and Analysis of Concrete-Filled Steel Structure Under Aircraft Impact." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48874.
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Concrete-filled steel structures (SC), or called steel concrete composite structures are composed of steel plates and reinforced concrete. This kind of structures has demonstrated more effective against blast and impact loads, and has been used in risk-sensitive structures such as the nuclear electric power plant and other critical constructions. The comprehensive modeling and analysis is performed in this paper for the full scale SC panel against aircraft impact after the testing results of 1/7.5 scaled model was reviewed and correlated. The methodology, modeling approach, and mesh density sensitivity investigation is presented.