棱线强化薄壁方管轴向压溃力学特性
发布时间：2018-09-06 09:51
【摘要】：基于Wierzbicki和Abramowicz提出的方管理想化折叠机构和能量耗散模式,引入棱线与平板的屈服强度比,修正了棱线强化薄壁方管在准静态轴向压溃作用下的能量平衡方程,并推导出了平均压溃力理论预测公式.CAE(computer aided engineering)数值仿真完整再现了稳定压溃阶段棱线强化方管形成一个新折叠单元的塑性变形过程.仿真与理论结果对照表明,理论预测公式可以较准确地预测棱线强化薄壁方管准静态轴向压溃过程的平均压溃力,且最大偏差不超过4.3%;其次,对于截面长、宽、高分别为56,56,1.0 mm的方管,仅占整个截面周长9.09%的4根强化棱线可使其平均压溃力提升53.8%.
[Abstract]:Based on the ideal folding mechanism and energy dissipation model of square tube proposed by Wierzbicki and Abramowicz, the energy balance equation of thin-walled square tube strengthened by edge line under quasi-static axial crushing is modified by introducing the yield strength ratio between edge line and plate. The theoretical prediction formula of average crashing force is derived. The numerical simulation of CAE (computer aided engineering) completely reproduces the plastic deformation process of a new folding element formed by the stiffened square tube in the stable crushing stage. The comparison between the simulation and the theoretical results shows that the theoretical prediction formula can accurately predict the mean crushing force in the quasi-static axial crushing process of thin-walled square tubes strengthened by edges, and the maximum deviation is not more than 4.3. Secondly, for the length and width of section, the maximum deviation is less than 4.3. The square tubes with a height of 56 ~ 56 mm and only 9.09% of the circumference of the whole section can increase the average crashing force by 53.8%.
【作者单位】： 同济大学汽车学院;江西省科学院应用物理研究所;
【基金】：国家“八六三”高技术研究发展计划(2012AA111302) 江西省交通厅重点工程项目(2015C0008)
【分类号】：U467.14
本文编号：2225972
[Abstract]:Based on the ideal folding mechanism and energy dissipation model of square tube proposed by Wierzbicki and Abramowicz, the energy balance equation of thin-walled square tube strengthened by edge line under quasi-static axial crushing is modified by introducing the yield strength ratio between edge line and plate. The theoretical prediction formula of average crashing force is derived. The numerical simulation of CAE (computer aided engineering) completely reproduces the plastic deformation process of a new folding element formed by the stiffened square tube in the stable crushing stage. The comparison between the simulation and the theoretical results shows that the theoretical prediction formula can accurately predict the mean crushing force in the quasi-static axial crushing process of thin-walled square tubes strengthened by edges, and the maximum deviation is not more than 4.3. Secondly, for the length and width of section, the maximum deviation is less than 4.3. The square tubes with a height of 56 ~ 56 mm and only 9.09% of the circumference of the whole section can increase the average crashing force by 53.8%.
【作者单位】： 同济大学汽车学院;江西省科学院应用物理研究所;
【基金】：国家“八六三”高技术研究发展计划(2012AA111302) 江西省交通厅重点工程项目(2015C0008)
【分类号】：U467.14
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，本文编号：2225972
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