【摘要】 本文从含微裂纹材料的变形能出发引出了裂纹的方位张量。在考虑裂纹受压闭合与滑动摩擦的基础上,给出了损伤张量、损伤应变及有效弹性常数。文中给出了损伤机构离散化的方法,并对方位密度给出了演化方程。最后给出一个单向拉压的应力应变关系例子,并揭示了裂纹扩展时的应力突跌现象。更多还原

【Abstract】 According to the concept of strain energy of cracked materials, the orientation tensor of crack is defined. Considering the crack-closing and friction between crack-surface under compression, the damage tensor, damage strain and effective elastic moduli are formulated. A method for discreted description of damage mechanism is given, and the evolution equation of discreted orientation density of cracks is obtained. Finelly, an example for uniaxial tension and compression is illustrated, and the stress drop phenomenon is revealed.更多还原