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Academic literature on the topic 'Monotonic torsional loading'

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Published: 14 March 2023

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Journal articles on the topic "Monotonic torsional loading"

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Georgiannou, V. N., and A. Tsomokos. "Comparison of two fine sands under torsional loading." Canadian Geotechnical Journal 45, no. 12 (December 2008): 1659–72. http://dx.doi.org/10.1139/t08-083.

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In this paper the behaviour of two “standard research sands”, widely used for experimental purposes, is compared in a torsional hollow cylinder apparatus under monotonic and cyclic loading conditions. Both sands are fine and uniform with D50 = 0.22 and 0.29 mm, respectively. However, their response to undrained monotonic loading at similar void ratios is dramatically different, with the finer sand showing strength reduction after peak and the coarser sand showing continuous increase in strength with torsional shear. The difference in response is mainly attributed to grain angularity and to a lesser degree to their grading. The results of drained torsional hollow cylinder tests show initial contraction followed by dilation. The stress ratio at phase transformation is uniquely defined by both drained and undrained tests for each sand. Cyclic loading instability is manifested by a sudden increase in shear strain and excess pore-water pressure leading to initial liquefaction. The instability initiates across the instability line for the sand showing strength reduction and across the phase transformation line for the sand showing continuous increase in strength with shearing. Both lines are defined under monotonic loading conditions. The liquefaction, stiffness, and damping characteristics of the sands are given in this paper.
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Yasuda, Nario, and Norihisa Matsumoto. "Comparisons of deformation characteristics of rockfill materials using monotonic and cyclic loading laboratory tests and in situ tests." Canadian Geotechnical Journal 31, no. 2 (April 1, 1994): 162–74. http://dx.doi.org/10.1139/t94-022.

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The deformation characteristics of rockfill materials at very small strains were investigated by comparing the results of monotonic and cyclic loading laboratory tests with geophysical P- and S-wave logging data from the field. Using a precision linear variable differential transformer for displacement, the elastic moduli of rockfill materials at very small strains were measured in monotonic and cyclic loading triaxial tests. The laboratory test results agreed well with the field results. The shear moduli of rockfill materials from both a monotonic loading torsional simple shear test and a cyclic loading torsional simple shear test also showed good correspondence. Furthermore, the shear modulus predicted from the in situ shear wave tests in rockfill dams corresponded reasonably well with the modulus in the large-scale triaxial tests in the laboratory. Key words : deformation characteristics, embankment dams, rockfill materials, laboratory test, in situ test.
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Georgiannou, V. N., A. Tsomokos, and K. Stavrou. "Monotonic and cyclic behaviour of sand under torsional loading." Géotechnique 58, no. 2 (March 2008): 113–24. http://dx.doi.org/10.1680/geot.2008.58.2.113.

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Kowalewski, Zbigniew L., and Tadeusz Szymczak. "An Influence of Step Cyclic Loading due to Torsion on Tensile Curve Variation." Key Engineering Materials 535-536 (January 2013): 181–84. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.181.

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The paper presents experimental results of tests carried out at room temperature on power engineering steel: 10H2M (11CrMo9-10) using thin-walled tubular specimens under biaxial stress state. The loading programme comprised different types of deformation, i.e. monotonic tension and cyclic torsion in the form of symmetric or asymmetric step-increasing strain amplitude. The main task of the paper was focused on investigation of an influence of the cyclic loading parameters on tensile curve variations. The magnitudes of axial strain and cyclic shear strain amplitude were small and did not exceed 1%. An analysis of the results showed a significant reduction of the axial stress (even equal 90% for the torsional amplitude ±0.8%, in both cases of cyclic loading). An influence of torsion frequency on the tensile stress curve was discovered within the range from 0.005Hz to 0.5Hz.
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Kedgley, Angela E., Sarah E. Takaki, Pencilla Lang, and Cynthia E. Dunning. "The Effect of Cross-Sectional Stem Shape on the Torsional Stability of Cemented Implant Components." Journal of Biomechanical Engineering 129, no. 3 (November 14, 2006): 310–14. http://dx.doi.org/10.1115/1.2720907.

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Stability of a cemented implant, once the stem-cement interface has debonded, is reliant upon stem geometry and surface finish. There are relatively few studies addressing the effect of cross-sectional stem shape on cemented implant fixation. The purpose of this investigation was to compare the torsional stability of five different stem cross-sectional shapes—circular, oval, triangular, rectangular with rounded edges, and rectangular with sharp edges—under monotonically increasing and cyclic loading conditions. Seven samples of each stem geometry were tested. Stems were potted in bone cement and loaded to 5 deg of rotation. For monotonic loading, torque was applied at a constant rate of 2.5 deg/min. For cyclic loading, a sine wave torque pattern was applied, with a maximum magnitude that began at 4.5 Nm for 1500 cycles and then increased by 2.25 Nm every 1500 cycles until 5 deg of rotation. The rectangular stem with the sharp edges always provided the greatest resistance to torque, followed by the rectangular with rounded edges, triangular, oval, and circular. These results, including the effects of sharp corners, may differ for modes of loading other than torsion. These experimental results support the findings of earlier finite element models, indicating stem shape has a significant effect on resistance to torsional loading.
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Ramaswamy, V. G., D. C. Stouffer, and J. H. Laflen. "A Unified Constitutive Model for the Inelastic Uniaxial Response of Rene’ 80 at Temperatures Between 538C and 982C." Journal of Engineering Materials and Technology 112, no. 3 (July 1, 1990): 280–86. http://dx.doi.org/10.1115/1.2903324.

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The objective of this research is to develop a constitutive equation for the uniaxial monotonic and cyclic response of Rene’80 between the temperatures of 538C and 982C. The constitutive equation is accompanied by experimental data for the evaluation of the material constants. Extensive verification is achieved through the successful correlation of tensile and creep response and prediction of mechanical cycling experiments including mean stress shifts. These results also serve as a starting point for reformulating the model for the prediction of the high temperature multiaxial response of Rene’80 that includes torsion, proportional, and nonproportional uniaxial and torsional loading histories.
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Li, Bingbing, Dunji Yu, and Xu Chen. "Effects of mean strain and tensile pre-strain on torsional fatigue behaviours of duplex stainless steel SAF2205." MATEC Web of Conferences 165 (2018): 15003. http://dx.doi.org/10.1051/matecconf/201816515003.

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Effects of mean strain and tensile pre-strain were investigated on the torsional fatigue behaviours of duplex stainless steel SAF2205. Two equivalent strain amplitudes (0.5%,0.7 %), three strain ratios (-1, - 0.5, -0.25) and 5% tensile pre-strain were chosen. Results indicated that the mean strain had no distinct influences on the torsional fatigue behaviours in terms of cyclic stress reponse and fatigue life while tensile pre-straining made a significant increase in cyclic stress response which was mainly attributed to the cross hardening derived from the loading sequence of monotonic tension preceding to cyclic torsion and led to a reduction in fatigue life. The failure mechanisms were revealed by scanning electron microscope characterized by microcracks initiation at the extrusions in ferrite and phase boundary inhibited further propagation. Additionally, the fractography of all fatigued specimens revealed a quasi-cleavage brittle mode with features of distinct tearing ridges and cleavage facets.
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Kim, J., M. Kazama, and Y. Kwon. "Effects of relative density and accumulated shear strain on post-liquefaction residual deformation." Natural Hazards and Earth System Sciences Discussions 1, no. 2 (April 24, 2013): 1579–617. http://dx.doi.org/10.5194/nhessd-1-1579-2013.

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Abstract. The damage caused by liquefaction, which occurs following an earthquake, is usually because of settlement and lateral spreading. Generally, the evaluation of liquefaction has been centered on settlement, that is, residual volumetric strain. However, in actual soil, residual shear and residual volumetric deformations occur simultaneously after an earthquake. Therefore, the simultaneous evaluation of the two phenomena and the clarification of their relationship are likely to evaluate post-liquefaction soil behaviors accurately. Hence, a quantitative evaluation of post-liquefaction damage will also be possible. In this study, the effects of relative density and accumulated shear strain on post-liquefaction residual deformations were reviewed through a series of undrained K0 control cylindrical torsional tests. In order to identify the relationship between residual shear and residual volumetric strains, this study proposed a new test method that integrates monotonic loading after cyclic loading, and K0 drain after cyclic loading-in other words, the combination of cyclic loading, monotonic loading, and the K0 drain. In addition, a control that maintained the K0 condition across all the processes of consolidation, cyclic loading, monotonic loading, and drainage was used to reproduce the anisotropy of in-situ ground. This K0 control was performed by controlling the axial strain, based on the assumption that under undrained conditions, axial and lateral strains occur simultaneously, and unless axial strain occurs, lateral strain does not occur. The test results confirmed that the restoration behaviors of effective stresses, which occur during monotonic loading and drainage after cyclic loading, respectively, result from mutually different structure restoration characteristics. In addition, in the ranges of 40~60% relative density and 50~100% accumulated shear strain, relative density was found to have greater effects than the number of cycles (accumulated shear strain).
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Jiang, W. "The Elastic-Plastic Response of Thin-Walled Tubes Under Combined Axial and Torsional Loads: Part I—Monotonic Loading." Journal of Pressure Vessel Technology 115, no. 3 (August 1, 1993): 283–90. http://dx.doi.org/10.1115/1.2929529.

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This paper investigates the elastic-plastic response of thin-walled tubes subjected to combined axial and torsional loads. The kinematic hardening model is used and exact closed-form solutions are obtained for linear loading paths. The characteristics of the stress-strain relationships are discussed and the corresponding movements of the yield center are illustrated. The response of the material under nonproportional loading is proved to be path-dependent, and the hardening behavior is shown to be different from that under proportional loading. The investigation then shows that such a difference will finally disappear when the stresses tend to infinity.
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Sabelkin, Volodymyr P., Gregory R. Cobb, Benjamin M. Doane, Ryan A. Kemnitz, and Ryan P. O’Hara. "Torsional behavior of additively manufactured nickel alloy 718 under monotonic loading and low cycle fatigue." Materials Today Communications 24 (September 2020): 101256. http://dx.doi.org/10.1016/j.mtcomm.2020.101256.

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Conference papers on the topic "Monotonic torsional loading"

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Siddiqui, Sanna F., Abiodun A. Fasoro, and Ali P. Gordon. "Torsional Response of Additively Manufactured Steel Under Monotonic and Cyclic Conditions." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76831.

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The value of additively manufactured (AM) components with application in the aerospace industry can be assessed by subjecting them to realistic operational service conditions. While there is considerable knowledge about the tensile response of AM materials, minimal studies have considered the torsional and torsional-fatigue response of AM materials. A comprehensive understanding of the effect of both axial and torsional conditions of AM parts can allow for improvements in manufacturing design of components to effectively meet or exceed service requirements. This study is the first study to date, to investigate the torsional and torsional-fatigue response of as-built direct metal laser sintered (DMLS) stainless steel (SS) GP1, through monotonic torsion and completely reversed torsional fatigue experiments, for samples built at varying orientations in the horizontal xy build plane. Experimental results include monotonic torsional shear properties, torsional cyclic response, and fracture surfaces, which will be used to assess the torsional material response with regards to build orientation. Findings will be used to contribute to a much needed and comprehensive framework of the material behavior of AM components when subjected to axial/torsional loading conditions.
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Chattopadhyay, Somnath. "An Investigation of Elastic-Plastic Torsion in Strain Hardening Materials." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-73748.

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Abstract The elastic-plastic problem of torsion of a solid circular bar of a strain hardening material has been studied in this work. The genesis of this study evolves from an experiment on torsion of circular bars where the torsional load (torque) was gradually increased causing the material to yield. The maximum torque caused the bar to go well into the plastic region. The torque-twist curves were generated for bars of circular cross-section made of aluminum. These curves which represent the material stress-strain curves, display strain-hardening characteristics. Upon load reversal, the materials yield in the reversed loading modes with reduced yield strength values displaying the Bauschinger Effect. The purpose of this investigation is to understand the effects of strain hardening on the torque-twist behavior of the materials under monotonic loading. The usual solutions to the elastic-plastic torsion assume elastic-perfectly plastic material behavior. These solutions are limited to cases where complete cross-section is plastic. This is because the elastic-plastic boundaries are generally difficult to find. Experimental solutions can be obtained readily for torsion of circular bars made of perfectly plastic materials using Nadai’s ingenious sand hill analogy. The torque for the case of sections going fully plastic can be directly obtained by determining the volume of the sand heap formed on a circular base (geometrically like the circular cross section of the bar). The analytical elastic-plastic torsion problem reduces to solving a Poisson’s equation with appropriate boundary conditions. The non-homogeneous part involves plastic strains for the strain hardened material, For the case of fully plastic behavior, the nonhomogeneous part is a constant and is amenable for analytical solutions. For the strain-hardened material, the nonhomogeneous part involves plastic strains. The solution therefore is not straightforward and requires the method of successive elastic solutions or successive approximations. It is to be noted that both the total and incremental theories of plasticity furnish the same solution to the torsion problem provided the material is perfectly plastic. It is reasonable to assume, therefore, that this will be approximately true for the case of strain hardened elastic-plastic material. Torsion experiments were conducted using circular bars of ductile materials such as steel and aluminum that exhibit strain hardening of various degrees. A good correlation results between the experimentally obtained torque twist characteristics with those obtained analytically. Relevant comparisons were also made with the fully plastic behavior obtained from Nadai’s sand heap analogy as the limiting case.
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Lim, T. Jesse, and Wei-Yang Lu. "Multi-Axial Cyclic and Monotonic Behavior of a 63Sn-37Pb Solder Alloy." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/epp-24729.

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Abstract In this work, the cyclic and monotonic loading of both pure torsion and uniaxial behavior of 63Sn-37Pb solder alloy are compared. By comparing the monotonic loading, it is shown that the ultimate equivalent stress of both torsion and uniaxial tensile behavior is comparable; and the failure strain in uniaxial tension is considerably less than that of pure torsion. The fatigue life of this solder alloy under the same equivalent strain amplitude for both uniaxial tension-compression and pure torsion are also comparable. These data provide a baseline for investigating the behavior of the solder alloy in the multi-axial stress-strain space.
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Hojo, Kiminobu, Daigo Watanabe, Shinichi Kawabata, and Yasufumi Ametani. "Ductile Crack Propagation Simulation of a Cylinder With a Through-Wall Circumferential Flaw Under Excessive Cyclic Torsion Loading." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28093.

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A lot of applications of elastic plastic FE analysis to flawed structural fracture behaviors of mode I have been investigated. On the other hand the analysis method has not been established for the case of the excessive cyclic torsion loading with mode II or III fracture. The authors tried simulating the fracture behavior of a cylinder-shaped specimen with a through-walled circumferential flaw subjected to excessive monotonic or cyclic loading by using elastic plastic FE analysis. Chaboche constitutive equation of the used FE code Abaqus was applied to estimate the elastic plastic cyclic behavior. As a result in the case of monotonic loading without crack extension, the relation of torque-rotation angle of the experiment was estimated well by the simulation. Also J-integral by the Abaqus’ function agreed with a simplified J-equation using the calculated torque-rotation angle relation. On the other hand under load controlled cyclic loading associated with ductile crack growth, the calculated torque-rotation angle relation did not agree with the experimental one because of high sensitivity of the used stress-strain curve. J-integral from Abaqus code did not increase regardless of the accumulated crack growth and plastic zone. Several simplified ΔJ calculations tried to explain the experimental ductile crack growth and it seemed that da/dN-ΔJ relation follows the Paris’ law. From these examinations an estimation procedure of the structures under excessive cyclic loading was proposed.
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Nayebi, A., and H. Rokhgireh. "A New Model to Describe Yield Surface Distortion Based on the Baltov and Sawczuk’s Model." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68952.

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In the present study Baltov and Sawczuk’s yield surface model is modified to represent compatible results with experimental observations. The proposed yield surface is determined during tension-torsion loading by considering kinematic hardening model and monotonic loading paths. The experimental results represent the nosed and flattened region in the loading and reverse loading direction respectively. The nosed region is dominant in tension than in torsion. The cross-effect is negligible in the small plastic strain amount. The Baltov and Sawczuk’s yield surface has nosed and flattened regions in both loading and reversed loading directions for negative and positive added material parameter respectively. Thus the elliptic Baltov and Sawczuk’s yield surface is modified by changing the sign of this parameter continuously from loading to reverse loading direction and the needed relations of the new model are obtained. The new model was able to predict properly the shape of yield surface. The experimental results compare well with the new model yield surface distortion predictions.
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Yang, N. H., H. Nayeb-Hashemi, and A. Vaziri. "Multi-Axial Fatigue Damage Models of Fiber Reinforced Composites." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62146.

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Fiberglass reinforced composites are extensively used in various structural components. In order to insure their structural integrity, their monotonic and fatigue properties under multiaxial stress fields must be understood. Combined in-phase tension/torsion loading is applied to [±45°]4 E-glass/epoxy composite tubes under monotonic and fatigue conditions to determine the effects of multiaxial loading on its failure. Various monotonic and fatigue damage criteria are proposed. These models considered failure mode (failure plane), the energy method and the effective stress-strain method. It is observed for the majority of experiments, the failure initiated at the outer lamina layer at 45° to the tube axis. A damage criterion for multiaxial monotonic loading is proposed considering both normal and shear stress contributions on the plane of failure. The experimental data show an excellent agreement with this proposed model for various loading conditions. Other failure models are currently under investigation utilizing the stresses and strains at the composite laminate as well as stress and strain at the outer lamina layer. Multiaxial fatigue failure models are proposed considering again the plane of failure. Since the plane of the failure is subjected to mean and cyclic stresses (shear and normal) and mean and cyclic strains (shear and normal), the fatigue damage models consider the contributions of these stresses and strains to the fatigue life of the composite tube. In addition to the fatigue damage model based on the plane of failure, a multi-axial fatigue failure model is proposed considering the mean and cyclic energy during fatigue experiments. The experimental data show a good correlation between the proposed damage parameters and fatigue life of specimens with some scatter of the data. Other fatigue failure models are currently under investigation considering the loading frequency and visco-elastic properties of the composite.
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Scott-Emuakpor, Onome, Tommy George, Charles Cross, John Wertz, and M. H. Herman Shen. "Validation of a Multi-Axial Fatigue Life Prediction Using Maximum Shear Experimental Results." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22547.

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A multi-axial prediction method is used to calculate the fatigue life of components under pure torsion loading. The general life prediction method was developed based on the understanding that the total accumulated strain energy density in a fatigue and monotonic processes is the same. Due to this understanding, the fatigue life prediction method has been used to calculate fatigue cycles of components experiencing either uniaxial, transverse shear, or multi-axial loads. This manuscript extends the capability of the multi-axial prediction method by calculating the fatigue life of components under pure torsion loads. This calculation is possible because the maximum applied shear stress from a pure torsion load can be observed as two normal principal stresses. Based on some unusual results from experimental torsion fatigue, it was assumed that a linear misalignment was present in the experimental setup. With the inclusion of this correction, a comparison between experimental torsion fatigue results and the energy-based prediction method further affirms the capability to determine fatigue life cycles in a multi-axial loading state.
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Owolabi, Gbadebo Moses, and Meera N. K. Singh. "A Comparison Between Two Models That Predict the Elastic-Plastic Behavior of Particulate Metal Matrix Composites Under Multiaxial Fatigue Type Loading." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42001.

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This paper is an effort to first modify two cyclic plasticity models developed for homogeneous metals to address the heterogeneous nature of particulate metal matrix composites (PMMCs), and subsequently to evaluate the resulting relations both theoretically and experimentally. Specifically, using the original Mro´z model and the endochronic theory of plasticity as their bases, two sets of elastic-plastic constitutive relations are identified. These sets of relations account for the interaction in stress fields between adjacent particles in PMMCs. The behavior predicted by each model is compared with experimental results obtained from a series of uniaxial and biaxial (tension-torsion) tests performed on circular specimens made of the 6061/Al2O3/20p-T6 PMMCs with 20% volume fraction of particles. The materials are tested for a variety of applied monotonic and cyclic loading paths.
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Yaguchi, Masatsugu, Masato Yamamoto, and Takashi Ogata. "A Unified Anisotropic Constitutive Model for a Ni Base Directionally Solidified Superalloy." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/creep2007-26527.

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Macroscopic deformation behavior of a Ni base directionally solidified (DS) superalloy was experimentally investigated and an anisotropic constitutive model for the material was developed. Monotonic and creep tests were performed on uniaxial test specimens machined from DS plates so that the angles between loading direction and the solidified grain direction varied between 0 to 90 degrees. Tension-torsion creep tests were also conducted to examine the anisotropic behavior under multiaxial stress conditions. The material exhibited remarkable anisotropy under elastic and viscous deformation conditions, while it showed isotropy under plastic deformation conditions of high strain rates. Then crystal plasticity analyses were carried out to identify slip systems under creep loading conditions and presume the anisotropic creep behavior of the DS material analytically. A unified constitutive model was proposed to express both the anisotropic elasticity-viscosity and the isotropic plasticity. The elastic constants were determined applying a self-consistent approach to the material, and viscous parameters were modeled on the basis of the crystal plasticity analyses. Calculation results obtained using the constitutive model were compared to the experimental data to evaluate validity of the model. It was demonstrated that the constitutive model could adequately describe the anisotropic behavior under uniaxial and multiaxial stress conditions with a set of material parameters.
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Branco, Jorge M., Filipe T. Matos, Paulo B. Lourenço, Thomas Demschner, and Patrício Rocha. "Lateral Tests on a Two-Story CLT House." In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.0969.

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<p>A two storey full-scale model of a CLT house, of 4.5 m x 9.1 m in-plane, with a height of 5.04 m, was tested under quasi-static monotonic (pushover). The main objectives were to investigate the 3-D system performance of a CLT structure subjected to lateral loads in terms of lateral strength and deformability capacity, global behaviour of the structure, frequency response of the structure, performance of connectors (mainly hold-downs and angle-brackets) and connections between CLT panels. Lateral loads have been applied on the storeys inducing torsion to the building. Loading procedure, number and disposition of connectors varied between tests.</p><p>With this campaign it is intended to obtain results on: i) load-deformation response of a 3-D CLT structure subjected to lateral loads; ii) global response of the structure, focusing on the performance of CLT slabs subjected to in-plane loads, performance of parallel and perpendicular walls, and response of the structure near openings; iii) failure mechanisms and on the performance of connections between CLT panels and connectors. The outcomes of the full-scale CLT house tests will be used for further analytical and numerical analyses to help implement the new generation of Eurocode 8.</p>
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