泡沫变形模式对泡沫填充圆管压溃行为的影响

摘要

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 ,the theoretical predictions of average crushing forces derived in this paper agree better with the experimental results.%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。