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基于归一化应变梯度变化的损伤识别方法研究

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摘要 针对传统静态损伤识别测量方法存在测量系统布置烦琐、测点有限以及基于应变参量的损伤识别受加载条件限制的问题,一种基于归一化应变梯度变化(Differential Gradient of Normalized Strain,DGNS)的损伤识别方法被提出.通过对只含有矩形槽的试件和同时含有方形通孔和裂纹的试件的数值计算,说明该方法能够有效识别塑性变形、裂纹等损伤.实验中,提出采用应变等值线密度变化(Differential of Strain Contour Density,DSCD)取代DGNS用以识别结构损伤,两者具有相同的物理意义,但DSCD更加有效地保证云图的平滑性和可视性,实验证明DSCD可以有效地识别塑性损伤.研究表明,DGNS(DSCD)可以很好地刻画出结构塑性变形、裂纹损伤特性,剔除由于结构自身不均匀造成的应变集中区域的影响,有效地孤立出损伤区域;DGNS(DSCD)是结构的本征参数,不依赖于外部载荷幅值;相比于传统的应变损伤识别,DGNS(DSCD)具有更加敏感、更早捕捉损伤的优势.
出处 《中国科学:技术科学》 EI CSCD 北大核心 2013年第5期574-584,共11页 Scientia Sinica(Technologica)
基金 中国科学院装备项目结构健康分析项目(批准号:074121YB1) 国家重点基础研究发展计划("973"计划)(批准号:2011CB711100) 中国科学院知识创新工程重要方向项目(批准号:KLCX2-EW-L04)资助
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