论文部分内容阅读
由力学方程及其解答的因次分析方法导出了不可压缩纯幂乘硬化材料的J积分和COD与标称应变(或标称形变功密度)及裂纹长度之间的简单函数表达式,并应用有限元计算结果的外推讨论了全塑性区中裂纹J积分关系J=2πα|σdε的有效性。给出了含深表面裂纹宽板弹塑性条件下COD和标称应变之间的近似关系,指出由于存在局部韧带屈服,Burdekin关系;δ/(2παεγ)=ε/(εγ)-0.25在这种含有深表面裂纹的全塑性宽板情况下并不适用。
The simple integral expression of J integral, COD, nominal strain (or nominal deformable work density) and crack length between incompressible pure power and hardened materials is deduced from the mechanics equation and its solution by means of factorial analysis. The validity of the J integral of crack J = 2πα | σdε in plastic zone is discussed by extrapolation of finite element results. The approximate relationship between the COD and the nominal strain under the condition of elastic-plastic stress with deep surface crack is given, and the Burdekin relation is given due to the yielding of local ligaments. Δ / (2παεγ) = ε / (εγ) -0.25 In this Not suitable for all plastic wide panels with deep surface cracks.