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悬索桥短吊索索力测试的探讨

齐东春,郭健,沈锐利

《中国工程科学》 2010年第12卷第7期页码 78-83

摘要：

因难以准确确定吊索的计算长度和抗弯刚度，按照公式法计算短吊索的索力误差一般较大。以新沟河大桥悬索桥吊索索力测试为研究背景，分析了吊索的边界条件、抗弯刚度、计算索长及线密度等因素对索力测试精度的影响，表明公式法的简化假设对短吊索不适用。介绍了有限元法分析吊索索力的方法，按吊索的实际尺寸建立有限元模型，首先识别出吊索的抗弯刚度，然后建立各吊索的索力—频率对应表格，查表即可得到实测频率对应的索力。该方法应用到新沟河大桥的施工监控，证明是一种行之有效的方法。

关键词：短吊索索力测试频率法抗弯刚度有限元法

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Finite element simulations of sheet metal forming under complex strain paths

CHEN Wei, YANG Jichang, WU Xiaofeng, LU Dun, GUO Weigang

《机械工程前沿（英文）》 2007年第2卷第4期页码 399-403 doi: 10.1007/s11465-007-0069-8

摘要： Fracture is a common defect in sheet metal forming and it is essentially caused by tensile instability. This paper analyzes some experiments and theories for building forming limit diagrams of sheet metal and points out the advantages and disadvantages of current experiments and theories. According to this, a method that integrates the finite element simulation and experiment was used to research the forming limit diagrams of the sheet metal under complex strain paths. Taking the rear hanger that undergoes twice stamping as an example, the strain paths of the dangerous point of the rear hanger is investigated. Finally, the forming method of the rear hanger is confirmed. Results indicate that finite element method (FEM) can achieve the complex strain paths and different strain paths will have great impacts on the result of the sheet metal forming.

关键词： dangerous forming method different hanger forming