Bending hinge characteristic of thin-walled square tubes
Bending hinge characteristic of thin-walled square tubes
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DOI：
10.1533/ijcr.2005.0346
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发表时间：
2005-03
影响因子：
1.9
通讯作者：
Xiaodong Huang;G. Lu
中科院分区：
文献类型：
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作者：
Xiaodong Huang;G. Lu
摘要以往的研究表明，薄壁方形金属管的整体弯曲坍塌铰由一系列固定铰线、滚动铰线和环面组成。特别是，他们已经表明，结构响应准静态测试的方式是，随着变形的进行，初始峰值力矩随后下降力矩。本文采用有限元分析的方法，进一步研究了带全局铰链的方形薄壁金属管的弯曲破坏机理。使用ABAQUS创建各种有限元模型。本文从弯矩-旋转合成曲线、整体破坏过程、塑性铰线的发展、截面轮廓以及沿截面的应力应变分布等方面进行了详细的数值计算。量纲分析理论表明，弯矩M取决于管材的宽厚比（b/t）、材料的流动应力（σ0）和相应的旋转角度（σ）。提出了弯矩的经验设计公式，并与现有试验结果进行了比较。最后，研究了材料的应变率效应对管材动态弯曲破坏的影响。
Abstract Previous studies have shown that a global bending collapse hinge of thin-walled square metal tubes composed with a series of stationary hinge lines, rolling hinge lines and toroidal surfaces. In particular they have shown that the structures respond to quasi-static testing by means of an initial peak moment followed by a falling moment as deformation proceeds. This paper further studies, using finite element analysis, the bending collapse mechanism of thin-walled square metal tubes with a global hinge. Various finite element models are created with ABAQUS. Detailed numerical calculations are made in terms of the resultant moment-rotation curves, the overall collapse process, development of plastic hinge lines, profiles of the cross-section and distributions of stress and strain along the cross-section. Dimensional analysis theory reveals that the bending moment, M, depends on the ratio of width to thickness of the tube (b/t), the flow stress of the material (σ0) and the corresponding rotation angle (σ). An empirical design formula for the bending moment is presented and compared with available test results. Finally, the strain-rate effect of the material is investigated for dynamic bending collapse of tubes.