在四周固支板结构上施加一个静载荷,求所测得的应变向量的单位向量,该单位向量与载荷大小无关,与加载位置有关,称为"模式".根据有限元理论,当某个单元出现了损伤,损伤对应变场的影响相当于一些附加载荷作用在完好结构上,且这些附加载荷作用在损伤所在的单元节点上.损伤检测的问题就成为多载荷识别问题.将损伤前后的模式进行相关分析,可以识别附加载荷位置,判别加载点是否是损伤位置.通过在结构上逐点加载,可以发现结构上出现的所有损伤.
Abstract：
When a force loads on a four-edge clamped plate, the normalized strain vector which is called "pattern" is not related to the intensity of force. It is the structural response to the position of force. According to FEM theory, when an element is damage, the strain field can be affect by damage, the effect of damage can be equivalent to extra forces loading on intact structure. These extra forces act on the nodes of damaged element. Damage identification can be replaced by extra forces identification. The correlation coefficient is calculated by health pattern and damage pattern. The position of extra forces can be judged by correlation coefficient, and damage can be located by correlation coefficient too. Loading every position on structure, all damages in structure would be identified.
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