| 外部加劲热轧钢管的分析和优化 |
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| 摘 要： | 利用非线性有限元法,分析了采用多种规格外部圆环加劲的圆柱形钢管的拟静力轴向破坏反应。加劲圆环将钢管沿竖向分为一系列的薄壁短柱结构。假定加劲肋的尺寸和形状由机械加工控制。研究了各种不同几何参数,如:钢管壁厚、环间距、环厚度和破坏时环的宽度,极限承载力和整体加劲钢管能量吸收的影响。将研究结果作为优化设计的基本原理。基于计算机模拟试验的分析,利用辐射函数,提出了关于平均承载力和能量消耗的后处理模型。运用单个对象和多个对象优化设计方程,得出不同反应特性的优化设计。根据渐进破坏屈曲得出的破坏模式依赖于加劲肋间距、加劲肋高度比、钢管壁厚以及加劲肋厚度比。优化结果显示,外加劲肋作为高效耗能构件是可靠的。
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| 关 键 词： | 加劲钢管 能量耗散 轴压破坏 优化 破坏模式 |
Analysis and Optimization of Externally Stiffened Crush Tubes |
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| Abstract: | Nonlinear finite element analysis is used to investigate the quasi-static axial collapse response of cylindrical tubes which are externally stiffened by multiple identical rings.The rings divide the long tube into a series of short thin-walled tubes.It is assumed that the size and shape of integral stiffeners are controlled through a machining process.The effects of various geometric parameters such as wall thickness,ring spacing,ring thickness and width on the collapse response,crush force and energy absor... |
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| Keywords: | Stiffened tubes Energy absorbers Axial crushing Optimization Collapse modes |
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