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首页> 外文会议>International Structural Engineering and Construction Conference(ISEC-03); 20050920-23; Shunan(JP) >New generation of elastic-plastic fracture theories Circumferential Strain Energy Theory (MN - r_p-σ_θ)
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New generation of elastic-plastic fracture theories Circumferential Strain Energy Theory (MN - r_p-σ_θ)

机译：新一代弹塑性断裂理论周向应变能理论（MN-r_p-σ_θ）

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摘要

In this paper a new generation of elastic-plastic fracture theories is developed. The new theory is called "Circumferential Strain Energy Theory (MN - r_p -σ_θ)" which means calculations of the components of strain energy density factors at the position of maximum circumferential tensile stress at the minimum radius of the plastic zone at crack vicinity. This theory can solve the problems of cracks under any load condition with higher accuracy than other criteria and theories. This theory is newly developed and introduced. It represents the great efforts for developing and investigating the accurate method to deal with the complicated problems of the cracks. This theory can be applied in linear elastic fracture mechanics LEFM and in elastic-plastic fracture mechanics EPFM for quasi-brittle homogeneous materials and brittle composites. It can be extended to be applied for ductile homogeneous materials and ductile composites. This theory can investigate each of the cracking load, crack propagation mechanism, crack propagation direction and crack propagation length. It can predict also the fracture toughness, crack growth path and the crack history. It can be bused for estimating of the safe life time of any structure made of these composites. It is developed for mixed mode cracks and can be applied for group of cracks of any type under static, cyclic or dynamic loading. Also, it can be applied for cracks under thermal stresses. It can be extended for the application of ductile structures and materials.
机译：本文提出了新一代的弹塑性断裂理论。新的理论称为“周向应变能理论（MN-r_p-σ_θ）”，这意味着计算裂纹附近塑性区最小半径处最大周向拉伸应力位置处的应变能密度因子的分量。该理论可以比其他标准和理论更高的精度解决任何载荷条件下的裂纹问题。该理论是新发展和引入的。它代表着开发和研究解决裂缝复杂问题的精确方法的巨大努力。该理论可用于准脆性均质材料和脆性复合材料的线性弹性断裂力学LEFM和弹塑性断裂力学EPFM。它可以扩展用于延展性均质材料和延展性复合材料。该理论可以研究开裂载荷，裂纹扩展机理，裂纹扩展方向和裂纹扩展长度。它也可以预测断裂韧性，裂纹扩展路径和裂纹历史。它可以用于估计由这些复合材料制成的任何结构的安全寿命。它是为混合模式裂纹而开发的，可应用于静态，循环或动态载荷下的任何类型的裂纹组。而且，它可以应用于热应力下的裂纹。它可以扩展用于延性结构和材料的应用。

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