Relevant bibliographies by topics / Multiaxia

Academic literature on the topic 'Multiaxia'

Author: Grafiati
Published: 5 March 2024

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Journal articles on the topic "Multiaxia"

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Wang, C. H., and M. W. Brown. "Life Prediction Techniques for Variable Amplitude Multiaxial Fatigue—Part 1: Theories." Journal of Engineering Materials and Technology 118, no. 3 (July 1, 1996): 367–70. http://dx.doi.org/10.1115/1.2806821.

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Fatigue life prediction under multiaxis random loading is an extremely complex and intractable topic; only a few methods have been proposed in the literature. In addition, experimental results under multiaxis random loading are also scarce. In part one of this two-part paper, a multiaxial non-proportional cycle counting method and fatigue damage calculation procedure are proposed, which is compared with one published damage-searching method. Both theories are based on critical plane concepts, one being an extension of the local strain approach for uniaxial variable amplitude loading and the other employing a new counting algorithm for multiaxis random loading. In principle, these two methods can be considered as bounding solutions for fatigue damage accumulation under multiaxis random loading.
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Qin, Li Kun, Ling Xia Gao, and Hong Wei Song. "Influence of Freeze-Thaw Cycles on Multiaxial Strength of Concrete." Applied Mechanics and Materials 405-408 (September 2013): 2715–18. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.2715.

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Mechanical properties experiments of concrete after 0, 25, 50 and 75 freeze-thaw cycles under uniaxial and multiaixial compression were carried out. The uniaxial and multiaxial compressive strengths of ordinary concrete after freeze-thaw cycles were measured. According to the experiment results, the influence of freeze-thaw cycles on the ultimate compressive and tensile strength was analyzed systematically. The influence law of freeze-thaw cycles on compressive strength of concrete under multiaxial compression was obtained. The results indicate that the compressive strength of ordinary concrete after freeze-thaw cycles under multiaxial compression is higher than that under uniaxial compression, and the degree of improvement is depended on its stress ratio. This conclusion can propose theoretical foundation for design of concrete structures in cold environment
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Ozdemir, Huseyin, and Kadir Bilisik. "Experimental Study on Angular Flexural Performance of Multiaxis Three Dimensional (3D) Polymeric Carbon Fiber/Cementitious Concretes." Polymers 13, no. 18 (September 11, 2021): 3073. http://dx.doi.org/10.3390/polym13183073.

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Multiaxis three-dimensional (3D) continuous polymeric carbon fiber/cementitious concretes were introduced. Their angular (off-axis) flexural properties were experimentally studied. It was found that the placement of the continuous carbon fibers and their in-plane angular orientations in the pristine concrete noticeably influenced the angular flexural strength and the energy absorption behavior of the multiaxis 3D concrete composite. The off-axis flexural strength of the uniaxial (C-1D-(0°)), biaxial (C-2D-(0°), and C-2D-(90°)), and multiaxial (C-4D-(0°), C-4D-(+45°) and C-4D-(−45°)) concrete composites were outstandingly higher (from 36.84 to 272.43%) than the neat concrete. Their energy absorption capacities were superior compared to the neat concrete. Fractured four directional polymeric carbon fiber/cementitious matrix concretes limited brittle matrix failure and a broom-like fracture phenomenon on the filament bundles, filament-matrix debonding and splitting, and minor filament entanglement. Multiaxis 3D polymeric carbon fiber concrete, especially the C-4D structure, controlled the crack phenomena and was considered a damage-tolerant material compared to the neat concrete.
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Ozdemir, Huseyin, and Kadir Bilisik. "Off-Axis Flexural Properties of Multiaxis 3D Basalt Fiber Preform/Cementitious Concretes: Experimental Study." Materials 14, no. 11 (May 21, 2021): 2713. http://dx.doi.org/10.3390/ma14112713.

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Multiaxis three-dimensional (3D) continuous basalt fiber/cementitious concretes were manufactured. The novelty of the study was that the non-interlace preform structures were multiaxially created by placing all continious filamentary bundles in the in-plane direction of the preform via developed flat winding-molding method to improve the fracture toughness of the concrete composite. Principle and off-axis flexural properties of multiaxis three-dimensional (3D) continuous basalt fiber/cementitious concretes were experimentally studied. It was identified that the principle and off-axis flexural load-bearing, flexural strength and the toughness properties of the multiaxis 3D basalt concrete were extraordinarily affected by the continuous basalt filament bundle orientations and placement in the pristine concrete. The principle and off-axis flexural strength and energy absorption performance of the uniaxial (B-1D-(0°)), biaxial ((B-2D-(0°), B-2D-(90°) and B-2D-(+45°)), and multiaxial (B-4D-(0°), B-4D-(+45°) and B-4D-(−45°)) concrete composites were considerably greater compared to those of pristine concrete. Fractured four directional basalt concretes had regional breakages of the brittle cementitious matrix and broom-like damage features on the filaments, fiber-matrix debonding, intrafilament bundle splitting, and minor filament entanglement. Multiaxis 3D basalt concrete, particularly in the B-4D structure, controlled the crack phenomena and it was recognized as a more damage-tolerant material than the neat concrete.
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Camara, Aliou Badara, Fabienne Pennec, Emmanuel Laurans, Vincent Peyronnet, Jean-Louis Robert, and Abdelhamid Bouchaïr. "Influence du type de démarche de fatigue multiaxiale sur la prévision de durée de vie d’un assemblage boulonné." Matériaux & Techniques 106, no. 2 (2018): 203. http://dx.doi.org/10.1051/mattech/2018038.

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Ce travail présente l’étude de l’évaluation de la durée de vie en fatigue d’un joint éclissé de rail en utilisant deux critères de fatigue multiaxiaux. Le premier critère, basé sur l’approche de type plan critique, est celui de Dang Van. C’est un critère largement utilisé pour les applications industrielles en France. Pour certaines conditions de chargement, en particulier lorsque la structure est soumise à des états de contraintes non proportionnels, l’approche plan critique ne fournit pas toujours une durée de vie conservative en fatigue. C’est la raison pour laquelle un autre critère, basé sur une approche différente de fatigue multiaxiale, a été implémenté et mis en œuvre. Le second critère relève de l’approche intégrale proposée par Zenner. Ces deux critères sont programmés sur le logiciel Matlab pour le calcul de la durée de vie en fatigue multiaxiale. Des différences significatives sont obtenues selon l’approche de fatigue multiaxiale utilisée.
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Chen, Xingqiao, Dongjian Zheng, Yongtao Liu, Xin Wu, Haifeng Jiang, and Jianchun Qiu. "Multiaxial Strength Criterion Model of Concrete Based on Random Forest." Mathematics 11, no. 1 (January 3, 2023): 244. http://dx.doi.org/10.3390/math11010244.

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The concrete strength criterion is the basis of strength analysis and evaluation under a complex stress state. In this paper, a large number of multiaxial strength tests were carried out, and many mathematical expressions of strength criteria were proposed based on the geometric characteristics and the assumption of a convex function. However, the rationality of the assumption of a convex function limits the use of these strength criteria. In particular, misjudgment will occur near the failure curve surface. Therefore, this paper does not assume the shape function of the criterion in advance. By collecting experimental data and using a machine learning method, it proposes a method of hidden function of failure curve surface. Based on 777 groups of experimental data, the random forest (RF), the back propagation neural network (BP) and the radial basis neural network (RBF) models were used to analyze and verify the feasibility and effectiveness of the method. Subsequently, the results were compared with the Ottosen strength criterion, the Guo Wang strength criterion and the Drucker–Prager (DP) strength criterion. The results show that the consistency between the strength criterion model established by the machine learning algorithm (especially random forest) and the experimental data is higher than the convex function multiaxis strength criterion of the preset failure surface shape. Moreover, the physical significance is clearer, the deficiency of the convex function failure surface hypothesis is avoided and the established multiaxial strength criterion of concrete is more universal.
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Lu, Fucong, Kun Zhang, Yuhang Hou, and Zhiwen Wu. "Investigation on Temperature-Dependent Multiaxial Ratchetting of Polycarbonate by a Novel Experimental Method." Advances in Materials Science and Engineering 2022 (May 13, 2022): 1–9. http://dx.doi.org/10.1155/2022/6577569.

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A novel method to heat the multiaxial hollow thin-wall specimen was proposed, where its gauge length section can be heated by the liquid (i.e., water) filled inside the specimen instead of the closed furnace. This method realizes the direct measurement of multiaxial strain on the surface of specimen at different temperatures by the noncontact digital image correlation. By utilizing the proposed method, the multiaxial stress-control cyclic tests were performed to investigate the multiaxial ratchetting of polycarbonate (PC) at different temperatures. It is found that the multiaxial ratchetting of PC depends greatly on the test temperatures and the multiaxial ratchetting strain increases with increasing the test temperature. The temperature-dependent multiaxial ratchetting is also influenced by valley stresses. The unrecoverable part of deformation in the multiaxial ratchetting strain increases with increasing temperature.
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Wang, Lei, Wu Zhen Li, and Tian Zhong Sui. "Review of Multiaxial Fatigue Life Prediction Technology under Complex Loading." Advanced Materials Research 118-120 (June 2010): 283–88. http://dx.doi.org/10.4028/www.scientific.net/amr.118-120.283.

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The research on multiaxial fatigue life prediction methods is reviewed in the present paper from two aspects of experiment and theory. It is pointed out that the reasonable methods of the critical plane determining, multiaxial cycle counting and multiaxial fatigue damage parameter fixing are necessary if the fatigue life prediction models established under the multiaxial constant amplitude loading were applied to the life prediction of the complex multiaxial load. The shortcomings of existing researches are discussed. In the aspect of experiment, it is devoid of the multiaxial fatigue test that the loading components acted with different frequencies, and in the aspect of theory, the additional hardening effect of the multiaxial out-of-frequency loading is not considered. Both in the theoretical research and practical engineering applications, the problem of the out-of-frequency multiaxial loading is a pressing issue.
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Shirafuji, Nakao, Kenji Shimomizuki, Masao Sakane, and Masateru Ohnami. "Tension-Torsion Multiaxial Low Cycle Fatigue of Mar-M247LC Directionally Solidified Superalloy at Elevated Temperature." Journal of Engineering Materials and Technology 120, no. 1 (January 1, 1998): 57–63. http://dx.doi.org/10.1115/1.2806838.

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This paper studies the high temperature multiaxial low cycle fatigue of Mar-M247LC directionally solidified superalloy. Tension-torsion multiaxial low cycle fatigue tests were carried out using Mar-M247LC tubular specimens at 1173K in air. Several multiaxial strain and stress parameters were applied to the experimental data to examine the suitability of the parameters. All the multiaxial strain parameters proposed so far could not successfully correlate the multiaxial low cycle fatigue data of the directionally solidified superalloy, but the maximum principal stress and the equivalent stress based on crack opening displacement could correlate the data within a small scatter. This paper proposes a new multiaxial strain parameter which takes account of the anisotropy of elastic constant of directionally solidified superalloys. The proposed strain parameter correlates the multiaxial low cycle fatigue data within a factor of two scatter band. This paper also describes the crack mode and cyclic constitutive relation of the superalloy in connection with the anisotropy of the elastic constant.
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Bercelli, Lorenzo, Cédric Doudard, and Sylvain Moyne. "Taking into account the non-proportional loading effect on high cycle fatigue life predictions obtained by invariant-based approaches." MATEC Web of Conferences 300 (2019): 12003. http://dx.doi.org/10.1051/matecconf/201930012003.

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Industrial structures are often subjected to multiaxial fatigue loadings. If the multiple stress signals are not synced the loading is said to be non-proportional. Most of the multiaxial fatigue criteria give highly inaccurate lifetime predictions when used in the case of such loadings. The scalar equivalent stress defined by the criteria does not take into account the non-proportional nature of the multiaxial loading and leads to non-conservative predictions. Moreover a multiaxial fatigue criterion can only be applied on a stress cycle which has no clear definition when multiple unsynced signals are to be considered. This study addresses these issues by proposing a correction of an invariant based multiaxial fatigue criterion through the definition of a non-proportional degree indicator. A definition of multiaxial cycle is also given based on the Wang-Brown method. Finally a complete chain of invariant based lifetime prediction for non-proportional multiaxial fatigue is validated.
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Dissertations / Theses on the topic "Multiaxia"

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Costecalde, Léna. "Data-Driven Model Identification for hyperelasticity : mapping the strain energy throughout multiaxial experiments." Electronic Thesis or Diss., Ecole centrale de Nantes, 2023. http://www.theses.fr/2023ECDN0047.

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Modéliser la réponse mécanique des matériaux consiste à établir une relation (un modèle) entre contraintes et déformations,dépendant de paramètres identifiés à partir de données expérimentales issues d’essais mécaniques. D’une part, l’identification basée sur des essais homogènes n’apporte pas d’information sur la réponse du matériau soumis à des sollicitations complexes. D’autre part, l'identification basée sur des essais multiaxiaux est plus coûteuse numériquement et impose le choix du modèle a priori. Récemment, a émergé la possibilité de représenter le comportement mécanique des matériaux par une base de données plutôt que via une loi de comportement au travers de la « Data Driven Computational Mechanics ». Dans ce cadre, l’algorithme Data-Driven Identification (DDI) développé par Leygue et al. (2018) permet d’estimer le champ de contrainte lors d’un essai multiaxial.Cette thèse propose d’explorer la réponse cinématique puis mécanique complète de membranes élastomères sollicitées en grandes déformations multiaxiales grâce à un montage expérimental original mettant en jeu un hexapode. La méthode DDI est ensuite utilisée pour déterminer la réponse en contraintes du matériau lors de ces essais. Deux développements sont finalement proposés : une méthode d’identification alliant DDI (sans modèle) et modèles de comportement, et une proposition d’amélioration des géométriesd’éprouvettes pour les essais multiaxiaux
Modeling the mechanical response of materials involves the derivation of a relationship (a model) between stresses andstrains, depending on parameters. These parameters are identified from experimental data obtained from mechanical tests. On the one hand, identification based on simple tests (uniaxial tension, for example) provides no information on the response of materials subjected to complex loading conditions. On the other hand, identification based on multiaxial tests is more costly numerically and requires the model to be chosen at the outset of the procedure. Recently, the possibility of representing themechanical behaviour of materials by a database rather than via a behaviour law has emerged through "Data-Driven Computational Mechanics". On this basis, the Data-Driven Identification (DDI) algorithm developed by Leygue et al. (Computer Methods in Applied Mechanics and Engineering, 331, 184-196 (2018)) can be used to estimate the stress fieldduring a multiaxial test. The present thesis explores the complete kinematic and mechanical response of elastomer membranes subjected to multiaxial large strain, using an original experimental set-up involving a hexapod. The DDI method is then used to determine the stress response of the material during these multiaxial tests. Two developments are finally presented: an identification method combining DDI (model-free) and standard constitutive models, and a proposal forimproving sample geometries for multiaxial tests
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Liu, Mu-Hsin. "Multiaxial Fatigue Testing Machine." Ohio University / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1266241731.

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Laverhne-Taillard, Karine. "Etude du comportement thermomécanique des alliages à mémoire de forme sous sollicitations multiaxiales complexes." Cachan, Ecole normale supérieure, 2006. http://www.theses.fr/2006DENSA001.

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Le comportement spécifique des Alliages à Mémoire de Forme (AMF) est dû à une transformation de phase appelée transformation martensitique. Cette transformation de phase peut être activée par des variations de température mais aussi par des chargements mécaniques. Si le comportement 1D de ces alliages est bien connu, la modélisation du comportement de ces alliages sous sollicitations multiaxiales complexes pose encore quelques problèmes. Dans un premier temps, nous nous intéressons à la validation expérimentale directe d'une relation entre la fraction volumique de martensite et la déformation de transformation qui est utilisée dans de nombreux modèles. Pour cela des essais en traction-compression-torsion avec suivi de résistance électrique sur un AMF de type Cu-Al-Be sont réalisés. Ces essais mettent en évidence les effets de la texture de ces alliages sur leur comportement. Par ailleurs, des simulations numériques de type micro-macro sont réalisées, pour différentes textures et pour différents trajets multiaxiaux proportionnels. Ces simulations complètent, d'une part, la base de données expérimentale, et permettent, d'autre part, de valider les hypothèses retenues pour la modélisation. Enfin, des essais anisothermes de traction compression torsion proportionnels et non proportionnels sont réalisés sur un AMF de type Ni-Ti. Une surface de début de réorientation de phase R est ainsi mise en évidence
The specific behaviour of Shape Memory Alloys (SMA) is due to a solid-solid transformation called martensitic transformation. This reversible transformation consists mainly in a shear without volume change and is activated either by stress or temperature. Despite all the properties of SMA are well known for one-dimensional mechanical loadings, the modelling of the 3D behaviour remains difficult. In a first step, we consider the experimental validation of a conjecture concerning the proportionality of the equivalent transformation strain with the martensite volume fraction. Therefore we perform tension-compression-torsion tests coupled with electrical resistance measurements on a Cu-Al-Be SMA. The behaviour of this alloy is sharply influenced by its crystallographic texture. Otherwise, numerical simulations on different textures and for several multiaxial loadings are performed. The experimental database is so completed in order to validate the choices made for the modelling. Finally, we perform several tension-torsion proportional and non-proportional, non-isothermal tests on a Ni-Ti SMA. The existence of an equivalent stress, able to describe the yield stress for phase-R reorientation is so highlighted
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Alsayed, Mahmoud Ibrahim. "Rock behaviour under multiaxial compression." Thesis, University of Newcastle Upon Tyne, 1996. http://hdl.handle.net/10443/1565.

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An experimental study has been carried out to investigate the behaviour of rock under multiaxial compression and assess the influence of both the stress conditions and test configuration on the apparent characteristics of this behaviour. Over three hundred specimens of Springwell sandstone, of various forms, have been tested using different loading techniques and most encountered stress fields. Cubes and thick-walled hollow cylinders have been subjected to uniaxial, biaxial, triaxial and polyaxial compression, and solid cylinders have been subjected to standard uniaxial and triaxial compression. Extensive work has initially been put into designing and developing the testing facilities required. A new multiaxial hollow cylinder test apparatus has been devised using a Hoek triaxial cell and specially designed system for the application of internal pressure, major modifications have been made to an existing multiaxial cubical test apparatus, and appropriate testing arrangements and procedures have been developed. Prior to initiating the experimental programme, characterisation tests have been conducted to determine the fundamental properties of the rock, and non-destructive ultrasonic wave velocity tests have been utilised together with statistical methods to examine any inherent variations in the specimens used. A remarkable agreement has emerged between the rock static and dynamic Young's moduli and the results have confirmed that the Springwell sandstone can practically be regarded as linear elastic, homogeneous and isotropic. The concept of the multiple failure state triaxial test has been utilised and extended to conduct multiple failure state polyaxial tests. While the concept remains useful, strain results obtained beyond the first failure state are likely to be inconsistent. Results of cube tests have been found to be highly influenced by the boundary conditions. Although the use of PTFE sheets can reduce the effect of friction between the specimen and the loading platens, it may equally have a weakening effect on the test specimen. The theory of elasticity has been found adequate to calculate the stresses in the hollow cylinders but remains inexact when deviation from linear behaviour occurs prior to failure. When the outer and inner surfaces of the cylinder are not perfectly concentric, the effect on the test results has proved negligible. Hollow cylinders have been found to provide an alternative means for measuring the rock indirect tensile strength. Results of biaxial and polyaxial tests on both cubes and hollow cylinders have confirmed the marked influence of the intermediate principal stress on the apparent strength of rock. Comparison of results from multiaxial tests on cubes, hollow and solid cylinders have shown that the apparent strength, deformability and failure characteristics of the rock are remarkably influenced by the stress conditions imposed as well as the test configuration used. Available failure criteria have advantages and disadvantages, but none of them can explain the diversity of the results obtained. On the whole, the results appear to cast doubt on common conceptions of rock failure and ultimately pose the question of how realistic current testing techniques are in their prediction of the actual behaviour of rock.
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Tomlinson, Philip S. "Multiaxial deformation of AZ80 magnesium alloy." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45362.

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The multiaxial deformation of magnesium alloys is important for developing reliable, robust models for both the forming of components and also analysis of in service performance of structures, for example, in the case of crash worthiness. This work presents a combination of unique biaxial experimental tests and biaxial crystal plasticity simulations using a visco-plastic self-consistent (VPSC) formulation conducted on AZ80 magnesium alloy in two different conditions - extruded and a more weakly textured as cast condition. The experiments were conducted on tubular samples which are loaded in axial tension or compression along the tube and with internal pressure to generate hoop stresses orthogonal to the axial direction. The results were analyzed in stress and strain space and also in terms of the evolution of crystallographic texture. In general, it was found that the VPSC simulations matched well with the experiments, particularly for the more weakly textured cast material. However, some differences were observed for cases where basal < a > slip and {10¯12} extension twinning were in close competition such as in the biaxial tension quadrant of the plastic potential. The evolution of texture measured experimentally and predicted from the VPSC simulations was qualitatively in good agreement. Finally, experiments and VPSC simulations were conducted in which samples of the extruded AZ80 material were subjected to a small uniaxial strain prior to biaxial loading in order to further explore the competition between basal slip and extension twinning.
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Triantafillou, Thanasis C. (Thanasis Christos). "Multiaxial failure criteria for celluar materials." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14315.

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Gonçalves, Camilla de Andrade. "Fadiga multiaxial policíclica : modelagem e simulação." reponame:Repositório Institucional da UnB, 2006. http://repositorio.unb.br/handle/10482/3638.

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Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Mecânica, 2006.
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O objetivo deste trabalho é o estudo de critérios de resistência à fadiga multiaxial de metais em regime de alto número de ciclos. Os modelos apresentados por vários autores propõem, como medidas principais, a contribuição das tensões normais e das tensões cisalhantes para a degradação por fadiga do componente, além dos parâmetros do material. A questão que se coloca no contexto de solicitações multiaxiais é: qual é a melhor medida para caracterizar a amplitude de tensões cisalhantes e como incorporar o efeito das tensões normais? O estudo desenvolve então, uma análise destas questões relacionadas à modelagem de um critério de resistência à fadiga. Tensões normais trativas contribuem de forma maléfica para a degradação por fadiga por agirem no processo de abertura de microtrincas; quase a totalidade dos modelos de fadiga multiaxial considera a tensão hidrostática como medida das tensões normais atuantes na solicitação à fadiga. Sabe-se que esta é basicamente uma média das tensões normais e propõe-se aqui a substituição desta, pela máxima tensão principal. A aplicação da proposta a um conjunto grande de resultados experimentais disponíveis na literatura confirmou a hipótese de que a pior situação, que corresponde à existência de uma micro-trinca ortogonalmente orientada à máxima tensão principal, deve ser considerada e fornece uma previsão de resistência à fadiga mais conservativa e portanto, a favor da segurança. Quanto às tensões cisalhantes, primeiro apresentam-se as propostas de alguns autores, destacando-se dentre elas a abordagem do envelope elíptico e do envelope prismático. As duas aproximações fornecem as mesmas boas previsões de resistência à fadiga para dados experimentais de carregamentos senoidais com ciclos de mesma freqüência. Avança-se a análise para carregamentos mais gerais cujas trajetórias se distanciam da forma de um elipsóide e verifica-se de maneira inédita que, para uma ampla faixa de histórias de carregamento, as medidas de amplitude de tensões cisalhantes obtidas pelo máximo envelope prismático são equivalentes às medidas correspondentes obtidas pelo mínimo envelope elíptico. Tal verificação foi comprovada considerando-se trajetórias com ciclos senoidais assíncronos proporcionais e fora de fase, e ciclos não senoidais selecionadas a partir de resultados experimentais relativos a situações limites de resistência à fadiga. ________________________________________________________________________________________ ABSTRACT
The aim of this work is to evaluate multiaxial high cycle fatigue criteria for metals. The models presented by many authors propose that the the normal and shear stresses are the main variables controlling the fatigue damage, as well as the materials parameters. In the multiaxial context, the fundamental question to be answered is: which is the best measure to characterize the shear stress amplitude and how the well known effect of the mean normal stresses can be incorporated in the modeling process? This work carries out an analysis of such issues! Tensile stresses reduce the fatigue strength of metals as they keep the crack faces opened. Almost the totally of the multiaxial fatigue models available in the literature considers the hydrostatic stress as a measure for the normal stresses acting upon the fatigue solicitation. The hydrostatic stress is basically an average of the normal stresses acting in three orthogonal planes passing through a material point. Here we claim that the worst situation in terms of fatigue solicitation corresponds to the existence of a micro-crack orthogonally oriented to the maximum principal stress. Therefore, the maximum principal stress rather than the hydrostatic stress should be considered as an appropriate measure of the mean normal stress effect on the fatigue solicitation. To validate this hypothesis available experimental data published in the literature were selected and compared with the estimates provided by a modified version of the Prismatic Hull criterion developed by Mamiya and Araujo. Concerning the shear stresses, some models which consider the Minimum Circunscribing Ellipsoid or the Maximum Prismatic Hull of the deviatoric stress path as an appropriate measure for the shear stress amplitude are presented. The analysis carried out considering different materials subjected to a broad range of loading paths involving sinusoidal loadings with distinct frequencies and non-harmonic loadings revealed the shear stress amplitudes measured by the prismatic hull are equivalent to the ones measured by the elliptic hull.
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Phillips, Peter Louis. "Integrated Multiaxial Experimentation and Constitutive Modeling." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1492598070791388.

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Hausding, Jan. "Entwicklung einer Verfestigungseinrichtung an einer Multiaxial-Nähwirkmaschine." Master's thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1161074776507-67779.

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Eine nachträgliche Verfestigung von nähgewirkten multiaxialen Gelegen führt zu einer verbesserten Ausnutzung der Verstärkungsfadeneigenschaften. Zu diesem Zweck wurden Lösungsansätze für eine entsprechende Verfestigungseinrichtung gesucht und bewertet. Drei Anlagenvarianten wurden durch die Kombination verschiedener Verfahren (Strahlungswärme, die Kombination aus Wärme und Druck sowie Walzenbeschichtung) und Bindemittel (Thermoplaste in verschiedenen Aufmachungen, Beschichtungsmassen) entworfen. Sie bieten auf die Einsatzzwecke Produktion, Laborbetrieb und geringster Aufwand abgestimmte Eigenschaften
The additional stabilization of open grid warp knits provides a better exploitation of the reinforcing yarns. To realize such an additional stabilization, various possible methods have been examined and assessed. Three different types of stabilization installations have been developed by combining the most promising technologies (infrared radiation, combination of heat and pressure, roll coater) and binding agents (thermoplastics, liquid agents). These installations offer special fea-tures for different needs: production, laboratory and least expense
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Le, Viet Duc. "Etude de l’influence des hétérogénéités microstructurales sur la tenue en fatigue à grand nombre de cycles des alliages d’aluminium de fonderie." Thesis, Paris, ENSAM, 2016. http://www.theses.fr/2016ENAM0012/document.

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Ces travaux de thèse concernent l’effet des hétérogénéités microstructurales sur la tenue en fatigue multiaxiale à grand nombre de cycles (FGNC) d’alliages d’Al-Si de fonderie utilisés dans un contexte automobile. Les hétérogénéités microstructurales caractéristiques de cette famille de matériau sont la matrice d’aluminium (souvent caractérisée à l’aide la DAS et/ou la SDAS et du niveau de durcissement par précipitation), les inclusions (particules de silicium, intermétalliques) et les défauts de fonderie (films d’oxyde et surtout porosités).Afin de découpler clairement ces effets, trois nuances d’alliages d’aluminium de fonderie obtenues à l’aide de différents procédés (coulée en coquille, coulée par procédé à moule perdu) et associées à plusieurs traitements thermiques (T7, Compression isostatique à chaud (CIC)) ont été étudiées. Le traitement CIC a en particulier été employé afin d’obtenir une microstructure exempte de pore. Une vaste campagne d’essais en FGNC a été conduite pour quatre modes de chargement : uniaxial (R=-1), torsion (R=-1), traction-torsion combinées (R=-1) et traction équibiaxiale (R=0.1). Les effets sur le comportement en FGNC ont été identifiés pour les matériaux avec et sans pores : effet de la multiaxialité pour les chargements à R=-1, effet de la contrainte moyenne et effet de la biaxialité en traction biaxiale à R=0.1. Une attention particulière a été portée à la caractérisation des mécanismes d’endommagement dans l’objectif de mettre en évidence le role des pores, de la matrice d’aluminium, des inclusions dans les mécanismes d’endommagement, et ceci pour les différentes modes de chargement.Deux approches analytiques ont ensuite été proposées. La première concerne la modélisation de l’effet de volume sollicité sur la tenue en fatigue sous chargement uniaxial en présence de pore en se basant sur une approche de prédiction de la taille maximale de pore dans un volume donné. La seconde, basée sur une approche probabiliste, est dédiée à la simulation du diagramme de Kitagawa-Takahashi pour différents modes de chargement. Ces deux approches conduisent à des résultats en accord avec l’expérience, ceci pour les différents matériaux et conditions étudiées.La dernière partie propose une analyse 3D par éléments finis de l’effet des pores sur la résistance en fatigue. L’analyse repose sur l’utilisation de la géométrie réelle des pores, obtenue à l’aide d’observations en micro-tomographie RX 3D. Ce travail a pour but d’évaluer la possibilité de prédire la limite de fatigue à l’échelle macrosopique à partir de la réponse mécanique "locale" au voisinage des pores critiques
This work treats the influence of the microstructural heterogeneities on the multiaxial high cycle fatigue (HCF) strength of cast aluminium alloys used in an automobile context. The characteristic microstructural heterogeneities present in this family of materials are the aluminium matrix (often characterised by the SDAS and/or the DAS and the precipitation hardening level), inclusions (silicon particles and intermetallics) and casting defects (oxide films and casting porosity).In order to clearly decouple these effects, three cast Al-Si alloys, obtained thank to different casting processes (gravity die casting and lost foam die casting) and associated with several heat treatments (T7 and Hot isostatic pressing-HIP), have been investigated. The HIP treatment is used in order to obtain a porosity free alloy. A vast experimental HCF campaign, including four loading modes (uniaxial (R=-1), torsion (R=-1), combined tension-torsion (R=-1) and equibiaxial tension (R=0.1)) has been undertaken. The following effects on the HCF behaviour have been characterised for the porosity free alloy as well as porosity containing alloys: (a) the effect of the multiaxiality (for the loading modes at R=-1), (b) the effect of the mean stress and (c) the effect of the biaxality (for equibiaxial tensile loads at R=0.1). The fatigue damage mechanisms have been studied in order to highlight the roles of the casting pores, the aluminium matrix and the inclusions on the fatigue damage mechanisms.Two analytical fatigue models are proposed. The first one concerns the effect of the loaded volume on the uniaxial fatigue strength of the porosity containing alloys using an approach to predict of the maximum pore size in a given volume. The second model, based on a probabilistic approach, takes into account the competition between the different observed damage mechanisms and leads to a Kitagawa-Takahashi type diagrams for different loading modes. It is shown that these analytical models result in good predictions for the three materials investigated and the four loading modes.A numerical study, presented in the last section, is related to the 3D finite element analysis of real pores. Real pore geometries are obtained thank to micro-tomography observations. The principal aim of this study is to evaluate the possibility of predicting the fatigue strength at the macroscopic scale thanks to the local mechanical behaviour around critical pores
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Books on the topic "Multiaxia"

1

Socie, Darrell. Multiaxial Fatigue. Warrendale, PA: SAE International, 1999. http://dx.doi.org/10.4271/r-234.

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Miller, KJ, and MW Brown, eds. Multiaxial Fatigue. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 1985. http://dx.doi.org/10.1520/stp853-eb.

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International Conference on Biaxial/Multiaxial Fatigue (4th 1994 Saint-Germain en Laye, France). Multiaxial fatigue and design. London: Mechanical Engineering, 1996.

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McDowell, DL, and JR Ellis, eds. Advances in Multiaxial Fatigue. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 1993. http://dx.doi.org/10.1520/stp1191-eb.

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1956-, McDowell David L., and Ellis Rod 1939-, eds. Advances in multiaxial fatigue. Philadelphia, PA: ASTM, 1993.

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1947-, Brown M. W., and Miller K. J, eds. Biaxial and multiaxial fatigue. London: Mechanical Engineering, 1988.

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Ewald, Macha, Będkowski W, Łagoda T, and European Structural Integrity Society, eds. Multiaxial fatigue and fracture. Kidlington, Oxford: Elsevier, 1999.

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J, Miller K., Brown M. W. 1947-, ASTM Committee E-9 on Fatigue., and ASTM Committee E-24 on Fracture Testing., eds. Multiaxial fatigue: A symposium. Philadelphia, Pa: American Society for Testing and Materials, 1985.

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International Conference on Biaxial/Multiaxial Fatigue (2nd 1985 University of Sheffield). Biaxial and multiaxial fatigue. London: Mechanical Engineering Publications, 1989.

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Klinger, Regine, Monika Hasenbring, and Michael Pfingsten. Multiaxiale Schmerzklassifikation. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49474-5.

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Book chapters on the topic "Multiaxia"

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Kurylo, Monica, and Edward Liebmann. "Multiaxial Assessment." In Encyclopedia of Clinical Neuropsychology, 2285–86. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-57111-9_2026.

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Kurylo, Monica, and Trisha Hay. "Multiaxial Assessment." In Encyclopedia of Clinical Neuropsychology, 1671. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-0-387-79948-3_2026.

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Kurylo, Monica, and Edward Liebmann. "Multiaxial Assessment." In Encyclopedia of Clinical Neuropsychology, 1–3. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56782-2_2026-2.

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Blétry, Marc, and Georges Cailletaud. "Multiaxial Fatigue." In Fatigue of Materials and Structures, 1–46. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118616994.ch1.

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Milella, Pietro Paolo. "Multiaxial Fatigue." In Fatigue and Corrosion in Metals, 477–520. Milano: Springer Milan, 2012. http://dx.doi.org/10.1007/978-88-470-2336-9_9.

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Lexcellent, Christian. "Multiaxial PlasticityMultiaxial plasticity." In Linear and Non-linear Mechanical Behavior of Solid Materials, 91–116. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55609-3_5.

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Munz, Dietrich, and Theo Fett. "Multiaxial Failure Criteria." In Ceramics, 167–202. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58407-7_10.

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Cantwell, Dennis P., and Lorian Baker. "Multiaxial Diagnostic Approaches." In Diagnosis and Assessment in Autism, 111–22. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0792-9_8.

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Ellyin, Fernand. "Multiaxial experimental facilities." In Fatigue Damage, Crack Growth and Life Prediction, 179–204. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-009-1509-1_5.

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Brown, M. W. "Multiaxial Fatigue Failure." In Advances in Fatigue Science and Technology, 339–61. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2277-8_14.

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Conference papers on the topic "Multiaxia"

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Camarena, Ernesto, Anthony G. Quintana, Victoria Yim, Peter W. Grimmer, John P. Mersch, Jeff Smith, John Emery, and Gustavo Castelluccio. "Multiaxial Loading of Threaded Fasteners." In AIAA Scitech 2019 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-2271.

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Mousselmal, H. D., P. J. Cottinet, L. Quiquerez, B. Remaki, and L. Petit. "A multiaxial piezoelectric energy harvester." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Henry Sodano. SPIE, 2013. http://dx.doi.org/10.1117/12.2009621.

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MEZZICH, JUAN E., and MARIA ISABEL ZAPATA-VEGA. "MULTIAXIAL DIAGNOSIS OF SCHIZOPHRENIC PATIENTS." In IX World Congress of Psychiatry. WORLD SCIENTIFIC, 1994. http://dx.doi.org/10.1142/9789814440912_0095.

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Wallner, Oswald, Josep M. Perdigues Armengol, and Anders L. Karlsson. "Multiaxial single-mode beam combiner." In SPIE Astronomical Telescopes + Instrumentation, edited by Wesley A. Traub. SPIE, 2004. http://dx.doi.org/10.1117/12.551072.

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Jiang, Yanyao, Tianwen Zhao, Xiaogui Wang, and Zengliang Gao. "Multiaxial Fatigue of 16MnR Steel." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93473.

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Uniaxial, torsion, and axial-torsion fatigue experiments were conducted on a pressure vessel steel, 16MnR, at room temperature. The uniaxial experiments were conducted using solid cylindrical specimens. Axial-torsion experiments employed thin-walled tubular specimens subjected to proportional and nonproportional loading. A critical plane multiaxial fatigue criterion recently developed was found to correlate well with all the experiments conducted for the material. In addition, the fatigue criterion correctly predicted the cracking behavior of the material subjected to different loading paths.
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Zhang, Cheng-cheng, Yuan Ren, Jing-yun Gao, Ying Li, and Kun Yang. "Analysis of Multiaxial Fatigue Evaluation in Engine Components Using an Improved Multiaxial Fatigue Life Model." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57128.

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Current design methodologies for LCF/HCF of aero engine components are based on traditional uniaxial stress/strain methods like strain-life (ε-N), stress-life (S-N) and Goodman / Haigh diagram approaches, often applied with a wide safe factors to account for uncertainties in the understanding of multiaxial loading and other effects. With constantly striving to improve the performance and life of gas turbine engines, there is a need to increase accuracy of life prediction and reduce maintenance cost. Some multiaxial fatigue methods like Manson-McKnight, Sines, Smith-Watson-Topper etc. were developed to convert the multiaxial stresses into an equivalent uniaxial stress. This conversion simply provides the treatment of both the mean stress, the stress amplitude and directions. However, critical locations in engine components often experience significant multiaxial non-proportional loading conditions, such as blades and LP/HP shafts are subjected to HCF loading associated with mixed bending and torsional vibration modes. In this paper, the use of a new multiaxial fatigue life model was explored in the prediction of multiaxial fatigue behavior in aeronautic materials and structural steel. This new life model is based on the multiaxial S-N curve and an improved multiaxial high-cycle fatigue criterion which validated before by authors. The applied range of this new multiaxial fatigue life model were also compared with other models. Several groups of solid and hollow specimens with different ductile materials were conducted and evaluated under multiaxial loading cases. The predictions based on the proposed model give a better statistical result than other models.
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Conle, F. A. "Durability Analysis Under Complex Multiaxial Loading." In Passenger Car Meeting & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1987. http://dx.doi.org/10.4271/871969.

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Wei, Haoyang, and Yongming Liu. "Energy-based multiaxial fatigue damage modelling." In 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-0646.

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Kurath, Peter. "Multiaxial Fatigue Criteria for Spot Welds." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1992. http://dx.doi.org/10.4271/920668.

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Banchi, Claudio. "Programming methods for multiaxis laser machining." In ICALEO® ‘94: Proceedings of the Laser Materials Processing Conference. Laser Institute of America, 1994. http://dx.doi.org/10.2351/1.5058868.

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Reports on the topic "Multiaxia"

1

Le, Jialiang, Joseph Labuz, Takaaki Koyanagi, and Chen Hu. Probabilistic Failure Criterion of SiC/SiC Composites Under Multiaxial Loading. Office of Scientific and Technical Information (OSTI), March 2023. http://dx.doi.org/10.2172/1963092.

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Beaver, P. W. A Review of Multiaxial Fatigue and Fracture of Fibre-Reinforced Composites. Fort Belvoir, VA: Defense Technical Information Center, January 1987. http://dx.doi.org/10.21236/ada191990.

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Kyriakides, S. Response and Crushing of Cellular Solids Under Uniaxial and Multiaxial Loadings. Fort Belvoir, VA: Defense Technical Information Center, April 2004. http://dx.doi.org/10.21236/ada423997.

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Lu, Wei-Yang. Small-Scale Multiaxial Deformation Experiments on Solder for High-Fidelity Model Development. Office of Scientific and Technical Information (OSTI), December 2002. http://dx.doi.org/10.2172/811190.

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Ruggles, M. B., G. T. Yahr, and R. L. Battiste. Static properties and multiaxial strength criterion for design of composite automotive structures. Office of Scientific and Technical Information (OSTI), November 1998. http://dx.doi.org/10.2172/290934.

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Khan, Akhtar S. Dynamic and Quasi-Static Multiaxial Response of Ceramics and Constitutive/Damage Modeling. Fort Belvoir, VA: Defense Technical Information Center, January 2001. http://dx.doi.org/10.21236/ada391958.

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Peterson, P. D., D. J. Idar, R. Rabie, C. S. Fugard, W. King, G. A. Buntain, and N. B. Crane. Quasi-static multiaxial testing of PBX 9501: Creep effects on Estane molecular weight. Office of Scientific and Technical Information (OSTI), February 1999. http://dx.doi.org/10.2172/334296.

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Riveros, Guillermo, Hussam Mahmoud, and Santiago Lopez. Multiaxial fatigue strength of structural bolts under combined cyclic axial and shear demands. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33270.

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Ding, J. L., K. C. Liu, and C. R. Brinkman. Multiaxial deformation and life prediction model and experimental data for advanced silicon nitride ceramics. Office of Scientific and Technical Information (OSTI), June 1993. http://dx.doi.org/10.2172/10162954.

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Reese, Ronald. A MultiAir®/MultiFuel Approach to Enhancing Engine System Efficiency. Office of Scientific and Technical Information (OSTI), May 2015. http://dx.doi.org/10.2172/1228747.

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