發(fā)布時(shí)間：2018-09-06 09:51

【摘要】：基于Wierzbicki和Abramowicz提出的方管理想化折疊機(jī)構(gòu)和能量耗散模式,引入棱線與平板的屈服強(qiáng)度比,修正了棱線強(qiáng)化薄壁方管在準(zhǔn)靜態(tài)軸向壓潰作用下的能量平衡方程,并推導(dǎo)出了平均壓潰力理論預(yù)測(cè)公式.CAE(computer aided engineering)數(shù)值仿真完整再現(xiàn)了穩(wěn)定壓潰階段棱線強(qiáng)化方管形成一個(gè)新折疊單元的塑性變形過(guò)程.仿真與理論結(jié)果對(duì)照表明,理論預(yù)測(cè)公式可以較準(zhǔn)確地預(yù)測(cè)棱線強(qiáng)化薄壁方管準(zhǔn)靜態(tài)軸向壓潰過(guò)程的平均壓潰力,且最大偏差不超過(guò)4.3%;其次,對(duì)于截面長(zhǎng)、寬、高分別為56,56,1.0 mm的方管,僅占整個(gè)截面周長(zhǎng)9.09%的4根強(qiáng)化棱線可使其平均壓潰力提升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%.
【作者單位】： 同濟(jì)大學(xué)汽車學(xué)院;江西省科學(xué)院應(yīng)用物理研究所;
【基金】：國(guó)家“八六三”高技術(shù)研究發(fā)展計(jì)劃(2012AA111302) 江西省交通廳重點(diǎn)工程項(xiàng)目(2015C0008)
【分類號(hào)】：U467.14

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