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Generalization Of Mvcci Approach For Lefm Problems Using Numerical Integration

机译:Lefm问题的Mvcci方法的数值积分泛化

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摘要

Modified Virtual Crack Closure Integral (MVCCI) has become a valuable tool for estimation of mixed-mode fracture parameters in Linear Elastic Fracture Mechanics (LEFM) problems. When finite elements with fewer nodes and using polynomial shape functions are employed at the crack tip for fracture analysis, the expressions for MVCCI can easily be derived and many times also be expressed in closed form. For higher order elements they become unwieldy and so a numerical integration scheme is proposed and this can be used with any type of element. The scheme requires a two-step numerical integration: one to evaluate nodal forces exerted by the solid below the crack extension line on the portion above and the second to evaluate Strain Energy Release Rates. This development makes the post-processing for fracture parameters easy and computationally economical for 3-dimensional fracture problems. The technique is used to estimate fracture parameters in certain practical problems using higher order elements and typical numerical results are presented.
机译:改进的虚拟裂纹闭合积分(MVCCI)已成为评估线性弹性断裂力学(LEFM)问题中混合模式断裂参数的有价值的工具。当在裂纹尖端采用节点数较少的有限元并使用多项式形状函数进行断裂分析时,MVCCI的表达式可以轻松推导,并且很多时候也可以用闭合形式表示。对于高阶元素,它们变得笨拙,因此提出了一种数值积分方案,该方案可以与任何类型的元素一起使用。该方案需要两步数值积分:第一步是评估裂纹扩展线下方的固体在上方部分上所施加的节点力,第二步是评估应变能释放率。这种发展使裂缝参数的后处理变得容易,并且对于3维裂缝问题在计算上是经济的。该技术用于使用某些高阶元素估算某些实际问题中的裂缝参数,并给出了典型的数值结果。

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