Effect of the foam deformation modes on the crushing behavior of foam-filled circular tube
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摘要: 将泡沫填充圆管的平均压溃载荷视为圆管、泡沫及圆管与泡沫相互作用三部分之和, 基于作者提出的直链塑性铰改进模型, 研究了两种泡沫变形模式对泡沫填充圆管准静态压溃行为的影响, 得到了新的最优屈曲半波长和平均压溃载荷的理论计算公式, 并研究了两种泡沫变形模式下, 偏心率和塑性角参数对最优屈曲半波长和平均压溃载荷的影响。结果表明, 泡沫变形模式 Ⅰ 下的平均压溃载荷略高于泡沫变形模式 Ⅱ 下的相应值, 泡沫变形模式对最优屈曲半波长影响较大; 与文献[14]相比, 所得平均压溃载荷理论预测值与试验结果吻合得更好。Abstract: Based on the improved straight chain plastic hinge model proposed by authors recently, the effects of two foam deformation modes on the compressive properties of foam-filled circular tubes were investigated. Considering the average crushing forces as the sum of average force of non-filled column, uniaxial resistance of foam, and the interaction between tube and foam, the analytical expressions of the optimal buckling half-wavelength and the average crushing force were obtained. The results show that the average crushing force under the foam deformation mode Ⅰ is a little higher than that of under the foam deformation mode Ⅱ , and the foam deformation modes greatly affect the optimal buckling half-wavelength. Compared with reference [14], the theoretical predictions of average crushing forces derived in this paper agree better with the experimental results.
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Keywords:
- foam-filled circular tube /
- uniaxial crushing /
- crushing force /
- deformation mode /
- quasi-static
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