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Orthotropic damage models for fatigue crack initiation and propagation /Yu, Ligang. January 1993 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1994. / Includes bibliographical references (leaves 173-195).
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Orthotropic damage models for fatigue crack initiation andpropagation俞立剛, Yu, Ligang. January 1993 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy
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Prediction of Damage Zone Growth in Composites Using Continuum Damage MechanicsMcLendon, Wesley R. 2009 December 1900 (has links)
The continuum damage mechanics (CDM) approach is widely used to model damage in polymer matrix composite materials which are represented using the homogenized properties of the fiber and matrix constituents. CDM simplifies the problem of accounting for a large number of defects in a material by considering the homogenized effect of the defects as a change in constitutive properties of the material. However, recent investigations of textile composites have shown that CDM inaccurately predicts the direction of damage zone growth for some composite architectures which fail under shear load, tending to predict failure transverse to the fibers. This behavior is fundamentally attributable to the fact that shear failure in textiles results in large (tow-scale) matrix cracks, while CDM is intended to model distributed micro-cracks. It is shown that when CDM is used to model shear failure in anisotropic continua, material anisotropy tends to cause CDM to predict failure contrary to what is expected for these structures. An approach is presented that may allow CDM to better predict damage growth for shear failure in composites by encouraging the creation of an intial damage zone with sufficient directional bias to overcome the effect of material anisotropy.
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Prediction of Damage Zone Growth in Composites Using Continuum Damage MechanicsMcLendon, Wesley R. 2009 December 1900 (has links)
The continuum damage mechanics (CDM) approach is widely used to model damage in polymer matrix composite materials which are represented using the homogenized properties of the fiber and matrix constituents. CDM simplifies the problem of accounting for a large number of defects in a material by considering the homogenized effect of the defects as a change in constitutive properties of the material. However, recent investigations of textile composites have shown that CDM inaccurately predicts the direction of damage zone growth for some composite architectures which fail under shear load, tending to predict failure transverse to the fibers. This behavior is fundamentally attributable to the fact that shear failure in textiles results in large (tow-scale) matrix cracks, while CDM is intended to model distributed micro-cracks. It is shown that when CDM is used to model shear failure in anisotropic continua, material anisotropy tends to cause CDM to predict failure contrary to what is expected for these structures. An approach is presented that may allow CDM to better predict damage growth for shear failure in composites by encouraging the creation of an intial damage zone with sufficient directional bias to overcome the effect of material anisotropy.
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Development of an anisotropic damage mechanics model in ductile fracture /Wang, Chun. January 1987 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1988.
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An integrated approach to measure and model fatigue damage and healing in asphalt compositesKarki, Pravat 15 September 2015 (has links)
This study presents a test and analysis method to determine both damage and healing characteristics of asphalt composites using the same test specimen. The test involves applying multiple stretches of load cycles, each separated by a period of zero load introduced at several different levels of reduced stiffness. The analytical procedure involves (1) using modified correspondence principles to transform the time-dependent physical quantities (stress, strain and energy density) into time-independent pseudo-elastic quantities, and then (2) using viscoelastic continuum damage mechanics to quantify damage and healing properties of the material based on the transformed quantities. The results obtained using two different asphalt mortars subjected to uniaxial and shear load cycles confirmed the findings from the previous researchers that the characteristic pseudo stiffness versus damage relationship for a given material is independent of testing conditions. More importantly, this study demonstrated that the aforementioned relationship was also independent of the rest periods introduced intermittently during the cyclic tests. Results also show that healing defined in terms of the change in the internal state variable for damage represents the true healing potential of a material. Furthermore, healing properties obtained using the proposed test method (a) agreed with the properties obtained using a more rigorous protocol with multiple test specimens, and (b) were independent of the loading conditions used to induce fatigue damage. These observations strongly suggest that the proposed method can be used to predict damage and healing properties for any arbitrary loading condition from properties determined using the proposed protocol. / text
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Development of an anisotropic damage mechanics model in ductile fracture王軍, Wang, Chun. January 1987 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy
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Damage characterization of multi-directional laminates with matrix cracks and delamination劉英傑, Liu, Yingjie. January 1996 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy
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Damage characterization of multi-directional laminates with matrix cracks and delamination /Liu, Ying-jie. January 1996 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf 173-184).
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Thermodynamic formulation for damaging materials李德利, Li, Deli. January 1993 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy
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