期刊：
Theoretical and Applied Fracture Mechanics,2002年38(3):211-220 ISSN：0167-8442
通讯作者：
Tang, XS
作者机构：
[Jiang, CP; Tang, XS] Department of Flight Vehicle Design and Applied Mechanics, Beijing University of Aeronautics and Astronautics, P.O. Box 508, Beijing 100083, China;[Zheng, JL; Tang, XS] Department of Bridge and Structure Engineering, Changsha Communications University, Changsha, Hunan 410076, China
摘要：
Constitutive relations for damaged materials are usually derived by invoking empirical hypotheses. In what follows, the constitutive functional expansion method is developed from irreversible thermodynamics. The constitutive equations for anisotropic elastic damaged materials are derived. The “damage effect functions” in the constitutive equations are determined from micromechanics. This is accomplished by relating the macroscopic mechanical property of damaged materials to the corresponding microscopic damage behavior. Established in particular is the relationship between the microgeometrical and phenomenological damage variables.
作者机构：
[杨端生; 潘军] Dept. of Bridge and Structure Eng., Changsha Commun. Inst., Changsha 410076, China;[黄炎] Dept. of Space Technol., Natl. Univ. of Defense Technol., Changsha 410073, China
通讯机构：
Dept. of Bridge and Structure Eng., Changsha Commun. Inst., China
摘要：
Based on the irreversible thermodynamics, the continuum damage theories for the elastic, thermoelastic and viscoelastic materials were developed systematically. The limitations of the well-known strain equivalence hypothesis were overcome. The constitutive equations for various damaged materials contain a group of different damage effect functions, which are, related to the microscopic geometry of material damage (i.e. the shapes, orientations and distributions of microdefects). The damage effect functions can be obtained from the solutions. of micromechanics. Based on the developed theories and by using the damage mechanics-additional load-finite element method, the fatigue lives for notched bar specimens of 30CrMnSiNi2A material were predicted. The present work lays the foundations for the developments of the practical and effective methods of damage mechanics in the engineering applications.
摘要：
Problems of overall stability in a multistory framework become significant with the increase in its height. This paper presents the stability analysis to a one-bay multistory framework under uniformly distributed load by means of continuum model. Continuum model is a substituting column converted from multistory framework. So, the analysis to multistory frame, which is an indeterminate structure, is reduced to that to a determinate one. The formula of critical load is developed by Galerkin method. The effect of the axial compressive deformation of framework column is taken into consideration.
