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

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

"Continuum harm Mechanics and Numerical purposes" offers a scientific improvement of the speculation of Continuum harm Mechanics and its numerical engineering functions utilizing a unified type of the mathematical formulations in anisotropic and isotropic harm types. The theoretical framework relies at the thermodynamic conception of strength and fabric dissipation and is defined through a suite of primary formulations of constitutive equations of broken fabrics, improvement equations of the broken kingdom, and evolution equations of micro-structures. in accordance with recommendations of damage-dissipation of the cloth kingdom and powerful evolution of fabric homes, a lot of these complicated equations, which take nonsymmetrized results of wear points under consideration, are constructed and transformed from the normal basic failure types in order that they are extra simply utilized and validated in quite a lot of engineering practices through experimental testing.

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

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Later, the thermodynamics of irreversible processes provided the necessary scientific basis to justify continuum damage mechanics as a theory (before 1993: Chaboche [2-33], Lemaitre and Chaboche [2-22], Leckie and Hayhurst [2-60], Murakami [2-48], Cordebois and Sidoroff [2-181] and Krajcinovic [245]; after 1993: Ibijola [2-2], Zhang and Valliappan [2-74], Voyiadjis [2-124], Tang et al. [2-164]' Massart [2-174], Abdul-Latif [2-180], Carol et al. [2-182 ]' Desmorat [2-183]). Models presented here are in the framework of thermodynamics that provides the possibility of identifying the damage by means of coupling with elasticity and plasticity.

The measure of damage considered by Pieichnik and Pachla [2-176] and Cheng [2-177] was the ratio of strain for damaged and undamaged cases as D = l -c/c* (2-5) The damage variable considered by Rosuselier [2-106] is measured from the mass density of material. From his calculations, the mass density of a damaged 20 2 Review of Damage Mechanics material p* must be less than the original undamaged one Po. Accordingly, the damage variable can be defined as n=1- p* j po (2-6) It should be noted that only in the case of large plastic deformation does this definition becomes valid [2-178].

The microstructure change was defined as the internal state variable due to the irreversible nature of the material behavior. 1 Constitutive Relations for Damaged Materials Due to the importance of the internal state variables they must be included in the constitutive equation for damaged materials. This concept has been previously utilized in continuum mechanics/thermodynamics for ductile and brittle materials by many investigators such as [2-22, 2-39, 2-45 , 2-120, 2-121 , 2-169]. A constitutive model should address equally the two distinct physical modes of irreversible changes and should satisfy the basic postulates of mechanics and thermodynamics, based on which Chow and Wang [2-214], Murakami et al.

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