Global ETD Search
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 13 of 13 for “"T-stress"”.
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Crack Path Selection in Adhesively Bonded Joints
… are plastically deformed, various levels of T-stress are achieved in the specimens. Test results of the specimens with various T-stresses demonstrate that the directional stability of cracks in adhesive bonds depends on the T-stress level. Cracks tend to be directionally stable when the …
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Mixed-Mode Crack Propagation in Functionally Graded Materials
… in functionally graded materials (FGMs) include stress intensity factors (SIFs) and T-stress (non-singular stress). These two fracture parameters are important for determining the behavior of a crack under mixed-mode loading conditions in brittle FGMs (e.g. ceramic/ceramic such as TiC/SiC). The …
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Simulation of Ductile Fracture in Pipeline Steels Under Varying Constraint Conditions
… (1) to study the effect of non-singular T-stress (or constraint) variations on crack tip opening angle (CTOA) of pipeline steels using modified boundary layer (MBL), and (2) to simulate ductile crack propagation in pipeline steels using drop weight tear test (DWTT) and comparing these FE …
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Domain-Integral Methods for Computation of Fracture-Mechanics Parameters in Three-Dimensional Functionally-Graded Solids
… domain integral method to compute J-integral and stress intensity factor values along crack fronts in FGM configurations under mode-I thermo-mechanical loading. The proposed domain integral formulation accommodates both linear-elastic and deformation-plastic behavior in FGMs. Next discussed is the …
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Fracture of a Model Functionally Graded Material Manufactured From a Photo-Sensitive Polyethylene
… spatial variations of Young's modulus, failure stress and failure strain, were tested under remote pure opening (mode I) and in-plane mixed mode loading conditions. Mixed mode loading was generated by positioning the edge crack at an angle with respect to either the applied load or the specimen …
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Steady crack growth through ductile metals: Computational studies
… surrounding linear-elastic material. The global stress intensity factor (KI) and imposed T-stress fully specify displacement constraints along the far-field boundary, and in a three-dimensional setting, the panel thickness reflects the only natural length scale. The initial studies in this work …
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High resolution fatigue crack growth analysis of crack closure and slip irreversibility using digital image correlation
… horizontal displacements was developed, and the stress intensity factors, KI and KII, and the T-stress for the isotropic and anisotropic cases were determined. To further scrutinize the crack closure in both modes I and II, two-point digital extensometers were placed along the crack flanks. Crack …
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Numerical Modeling Issues in Finite Element Simulation of Plasticity Induced Crack Closure With an Emphasis on Material Model Effects
… the model is 3D, 2D plane strain, or 2D plane stress, and if the T-stress is compressive or tensile. This work reveals that cyclic accumulation of permanent deformation (strain ratcheting) is responsible for mesh dependence when the rate of growth depends on the element size. Mesh refinement …
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A design protocol for failure resilient architected metamaterials
… of 3D metamaterials. It is demonstrated that (i) stress intensity factor K_I is insufficient to characterize fracture and (ii) standard fracture testing protocols, established over the last 50 years, are inappropriate for such materials. We uncover the significance of T-stress (T) effects in …
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Micromechanical models of delamination in aluminum-lithium alloys
… correction terms into a standard objective stress rate integration, to accurately account for the kinematics of lattice deformation. The CP model implements slip system hardening with a modular approach to facilitate quick testing and calibration of different theories of hardening. The …
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An investigation of adolescent constructs of stress and academic achievement /
… investigation of adolescent constructs of stress and academic achievement. The study utilised a modified version of George Kelly's Repertory Grid Technique to provide direct insight into adolescent stress and academic achievement. The premise of the study was that only students who …