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首页> 外文期刊>International Journal of Solids and Structures >Parameter identification for cracks in elastic plate structures based on remote strain fields
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Parameter identification for cracks in elastic plate structures based on remote strain fields

机译：基于远程应变场的弹性板结构裂缝参数识别

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摘要

A method for the detection of cracks in plate structures is presented. In contrast to most of the common monitoring concepts taking advantage of the reflection of elastic waves at crack faces, the presented approach is based on the strain measured at different locations on the surface of the structure. This allows both the identification of crack position parameters, such as length, location and angles with respect to a reference coordinate system and the calculation of stress intensity factors (SIF). The solution of the direct problem is performed on the basis of the BFM (body force method). The inverse problem is solved applying the particle swarm optimization (PSO) algorithm. The BFM is based on the principle of linear superposition which allows the calculation of the strain field in a cracked body. The strain at an arbitrary point in the structure is replaced by the strain provided by body force doublets in the uncracked structure. The doublets as well as external loads are parameters which have to be determined solving the inverse problem by minimizing a fitness function, which is defined by a square sum of residuals between measured strain distributions and computed ones for an assumed crack. The PSO algorithm applied to the fitness function operates on the basis of a swarm of candidate solutions. Once knowing loading and crack parameters, the SIF can be determined.
机译：提出了一种检测板结构裂缝的方法。与大多数利用裂缝表面弹性波反射的常用监测概念相比，本文提出的方法基于在结构表面不同位置处测得的应变。这样既可以识别裂纹位置参数，例如相对于参考坐标系的长度，位置和角度，也可以计算应力强度因子（SIF）。直接问题的解决是基于BFM（体力法）进行的。应用粒子群算法（PSO）解决了逆问题。 BFM基于线性叠加原理，可以计算裂纹体中的应变场。结构中任意点的应变被未破裂结构中的体力双峰所提供的应变所替代。双峰和外部载荷是必须通过使适应度函数最小化来确定来解决反问题的参数，适应度函数由所测应变分布与假定裂纹的计算应变分布之间的残差平方和定义。应用于适应度函数的PSO算法基于大量候选解决方案进行操作。知道载荷和裂纹参数后，即可确定SIF。

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