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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 86 for “"Failure criteria"”.
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Multiaxial failure criteria for celluar materials
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1989.
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Constitutive equations and failure criteria for amorphous polymeric solids
Anand & Gurtin (2002) have recently developed a continuum theory for the elastic-viscoplastic deformation of amorphous solids. Their theory is motivated by and builds on the work of Parks, Argon, Boyce, Arruda, and their co-workers (e.g. Boyce et al., 1988; Arruda & Boyce, 1993) on modeling the …
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Sahraei failure criteria for detection of short circuit in lithium-ion batteries
… conditions and developing predictive models for failure is essential for enhancing safety and optimizing protective structures in EVs. This dissertation presents a comprehensive analysis of Li-ion battery behavior under multiple loading scenarios, supported by two novel modeling approaches: a …
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Failure Criteria and Cumulative Damage in Fatigue Under Multi-Axial Stress Conditions
… V, 4 new equation for predicting the fatigue failure of ductile metals under multiaxial stress is proposed based on the maximum range of shear stress modified for the effects of the normal stress acting on the maximum shear stress plane and of anisotropy. ý' This equation is shown to give …
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Optimal design and testing of laminated specimens to evaluate competing composite failure criteria
… find areas of maximum disagreement between the failure criteria of Tsai and Hart-Smith. The Tsai criterion is quadratic in the stresses and employs a selective and progressive ply-by-ply degradation scheme to predict ultimate load. Hart-Smith’s criterion is based on a fiber shear failure of the …
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First passage and other failure criteria in narrow-band random vibration: a discrete state approach.
Massachusetts Institute of Technology. Dept. of Civil Engineering. Thesis. 1970. Ph.D.
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Random delamination of graphite/epoxy laminated composites : stress analysis, failure criteria, experimental characterization and stochastic modeling
The delamination failure of laminated composites exhibits two distinct characteristics; (1) the corresponding failure strengths display considerable scatter, and (2) the morphologies of the fracture surfaces and the interlaminar strengths are dependent on the magnitude of the fiber orientation …
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Progressive Failure Analysis of Laminated Composite Structures
… composite structures requires a complete failure analysis, which includes both initiation and propagation of damage. In this work a progressive failure methodology is developed and implemented in the commercial Finite Element software package, Abaqus. Out of the numerous failure criteria …
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Reliability and failure analysis of composite beams and plates containing stress concentrations
… bending, ABAQUS is used. For stress and failure analysis of laminated composite plates under transverse loading, a nonlinear finite element analysis program ENCOMPLIT which accounts for the geometrical nonlinearity in von Karman sense and transverse shear deformation was developed. Both …
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High-Resolution peripheral Quantitative Computed Tomography Based Finite Element Modelling of Distal Radius Strength: Assessing Effect of Heterogeneous Material Properties and Scan Site
… mechanical properties. Further, the effect of failure criteria on the predictions acquired using this model and their precision error is not known. The aim of this study was to evaluate two different HR-pQCT-FE modeling approaches of distal radius for predicting failure load of the intact …
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Performance Analysis of Airport Flexible Pavements Subjected to New Generation Aircraft
… The NAPTF 1-inch surface upheaval pavement failure criteria did not yield consistent rut depths. A functional failure criteria (limiting rut depth at desired traffic level) is proposed. A 5-inch thick AC surface layer is not sufficient to prevent rutting under NGA loading in spite of having …
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Failure Initiation and Progression in Internally Pressurized Non-Circular Composite Cylinders
In this study, a progressive failure analysis is used to investigate leakage in internally pressurized non-circular composite cylinders. This type of approach accounts for the localized loss of stiffness when material failure occurs at some location in a structure by degrading the local material …
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The Deformation and Fracture of Thick Thermal Barrier Coatings
… industry, increased thickness causes some TTBCs failure to occur within the bulk of the coating materials and away from the interface. This necessitated the study of mechanical properties of the coating materials independent of the substrate. In order to enhance the performance and to predict the …
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Effective and total stress strength interpretation for silts
… undrained shear make it difficult to define failure. Because of this behavior, the test results were interpreted using different failure criteria to assess the effective stress friction angle and the undrained strength parameters. Test results indicate that the effective stress friction angle …
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Progressive damage and failure of unidirectional fiber reinforced laminates under impact loading with composite properties derived from a micro-mechanics approach
… damage initiation, damage progression, and failure of 16-ply unidirectional fiber reinforced laminates impacted at normal incidence by a rigid sphere. The damage is assumed to initiate when at least one of Hashin's failure criteria is satisfied with the evolving damage modeled by an …
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Response and Failure of Internally Pressurized Elliptical Composite Cylinders
… those of a circular cylinder. An evaluation of failure using the maximum stress and Hashin failure criteria and geometrically linear and nonlinear analyses is presented for elliptical cylinders. These failure criteria involve interlaminar shear stresses which are computed by integrating the …
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LS-Dyna for Crashworthiness of Composite Structures
… different crushing modes based on different failure criteria. Therefore it is important to have a tool that could simulate the crushing response of the composite tubes under crushing or impact load.</p><p>This thesis is aimed at the validation of finite element simulation methods for …
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Effect of processing induced defects on the failure characteristics of graphite epoxy angles
… was to investigate the bending strength and failure characteristics of AS4/3501-6 and AS4/1806 graphite/epoxy angles sections as a function of processing induced defects and porosity. The angle sections were removed from 30-inch long angles fabricated at Lockheed Georgia Company with two …
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Non-linear analysis of infilled frames.
… beams, interfaces and loading are developed. Failure criteria for concrete under multiaxial stress and also failure criteria for masonry under uniaxial compression are developed. The non-linear elastoplastic behaviour of concrete is modelled using the concept of equivalent uniaxial strain and …
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Finite element models for predicting crack growth characteristics in composite materials
… load level for crack extension and two new failure theories, modifications of the point stress and the Hashin failure criteria, are proposed to predict the direction of crack extension in composites. Comparisons are made with the Tsai-Wu failure criterion and the Sih strain energy density …
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