研究了薄壁正弦波纹管在轴向载荷作用下的力学行为。通过引入偏心因子和振幅因子并考虑材料的应变强化效应，根据能量守恒理论和塑性铰理论建立正弦波纹管的塑性屈曲理论模型，得到了压溃过程中的塑性弯曲耗散能、拉伸耗散能、压溃力的理论表达式。分析结果表明：理论分析与实验结果和数值模拟结果相吻合；平均压溃力与有效压缩距离因子和振幅因子有关；正则化压溃力随着波纹管的波长、振幅的增加而减小，但是随着振幅因子的增加而增加。
Abstract
The mechanical behaviors of a thin-walled sinusoid corrugated tube under axial loading were investigated. Introducing eccentricity factor, amplitude factor and considering strain- enhancing effect of material, the theoretical model for plastic buckling of a sinusoid corrugated tube was proposed based on the energy conservation principle and the plastic hinge theory. The theoretical expressions of plastic bending dissipation energy, stretch dissipation energy and crushing force of the sinusoid corrugated tube were obtained during the crushing process. The results showed that the theoretical analysis results agree well with those of tests and numerical simulation; the mean crushing force is related to effective compression distance factor and amplitude factor; the normalized crushing force decreases with increase in wavelength and amplitude of the sinusoid corrugated tube, and increases with increase in amplitude factor.
关键词
正弦波纹管 /
轴向载荷 /
压溃力 /
振幅因子
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Key words
sinusoid corrugated tube /
axial loading /
crushing force /
amplitude factor
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