摘要
利用非局部弹性理论和最大拉应力准则，推导了陶瓷材料Ⅰ、Ⅱ型裂纹平面应变断裂韧度的理论计算公式。公式与裂纹几何无关，仅与材料参数有关。通过实验得出，断裂动度的理论值是测试值的下限。断裂韧度的理论计算公式将材料的宏观力学性能与微观结构参数联系起来，对全面理解材料断裂的物理机理是有益的。
The theoretical calculation formula for the plane strain fracture toughness of mode Ⅰ and Ⅱ cracksof ceramic materials is deduced in this paper by using the nonlocal elasticity theory and maximum tensile stress criterion. The deduced formula,which is independent of crack geometry,bears a relation to material parameters. It isshown through experiment that the theoretical value of fracture toughness is the lower limit of testing value. Thetheoretical calculation formula for fracture toughness relates the macromechanical performance of materials withthe microstructural parameters and,therefore,is beneficial to fully understanding the physical mechanism of materials rupture.
出处
《机械强度》
CAS
CSCD
北大核心
1996年第4期47-50,共4页
Journal of Mechanical Strength
基金
国家建材局行业基金
关键词
非局部弹性理论
断裂韧度
陶瓷材料
nonlocal elasticity theory, fracture toughness, ceramic meterial
