New PDF release: Continuum Damage Mechanics and Numerical Applications

By Prof. Wohua Zhang, Prof. Yuanqiang Cai (auth.)

ISBN-10: 3642047076

ISBN-13: 9783642047077

ISBN-10: 3642047084

ISBN-13: 9783642047084

"Continuum harm Mechanics and Numerical functions" provides a scientific improvement of the speculation of Continuum harm Mechanics and its numerical engineering purposes utilizing a unified type of the mathematical formulations in anisotropic and isotropic harm types. The theoretical framework relies at the thermodynamic thought of strength and fabric dissipation and is defined by way of a collection of primary formulations of constitutive equations of broken fabrics, improvement equations of the broken kingdom, and evolution equations of micro-structures. in line with ideas of damage-dissipation of the cloth kingdom and potent evolution of fabric houses, a majority of these complex equations, which take nonsymmetrized results of wear facets under consideration, are constructed and transformed from the normal normal failure types in order that they are extra simply utilized and established in a variety of engineering practices through experimental testing.

Dr. Wohua Zhang is a Professor at Engineering Mechanics study middle in Zhejiang collage of China. Dr. Yuanqiang Cai is a Professor at division of Civil Engineering in Zhejiang college of China.

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Sample text

Many metals can fracture by this mechanism alone, though it is more usual for other mechanisms to contribute also. Grain boundary cavity formation is a kinetic phenomenon and its influence on deformation resistance and on the fracture mode under an arbitrary stress state depends critically on the cavity nucleation rate and growth rate. When both rates are high, there is a potential for a strong coupling between cavitations and creep rate through the mechanism of creep constrained cavity growth, leading to rapid tertiary creep [2-203].

In order to emphasize the influence of maximum principal stress on damage growth and strain rate for creep damage problems, Leckie and Martin [2-57], and Leckie and Hayhurst [2-58"-'59] presented a creep damage kinetic equation under maximum shear stress. In order to illustrate the creep speed sensitivity during the second and third creep stages, many researchers [2-14, 2-18, 2-29, 2-49, 2-194, 2-256] modified the Robotnov' model and suggested that the damage growth equations should include the influence of the effective stress rat e.

Material scientists studying creep damage are not content with this vague description of damage. The dissatisfaction is reinforced when attempts are made to model the growth of voids or cracks during creep, which can lead to equations that do not appear to resemble those of the continuum treatment. The weakness of the approach is further demonstrated by the obvious experimental fact that there are several mechanisms of creep damage, while the continuum equations appear to describe only one. Thus research into creep damage has been extended into the area of categorizing damage mechanisms.

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Continuum Damage Mechanics and Numerical Applications by Prof. Wohua Zhang, Prof. Yuanqiang Cai (auth.)

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