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金属圆管抗卷曲劈裂变形吸能特性研究
Study on deformation and energy-absorption properties of axial splitting and curling Inhibition of metal circular tubes
投稿时间: 2016-09-27  最后修改时间: 2017-02-22
DOI:
中文关键词:  金属圆管  轴向劈裂  抑制卷曲  恒定载荷  吸能特性  安全防护
英文关键词:metal circular tube  axial splitting  curling inhibition  constant load  energy-absorption property  safety protection
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
代连朋 辽宁工程技术大学 DAI_lianpeng1992@163.com 
潘一山 辽宁大学辽宁工程技术大学 panyish_cn@sina.com 
王爱文 辽宁工程技术大学 waw_lnt@126.com 
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中文摘要:
      为研究小尺寸、高吸能比率的安全防护吸能元件及其吸能特性,试验对比研究了壁厚3mm与4mm、内径均为26mm的两种类型金属圆管在抗卷曲轴向劈裂过程中的变形及能量吸收特性,并采用能量法分析了其吸能原理。研究结果表明:试件劈裂吸能过程分为“波动载荷”吸能阶段和“恒定载荷”吸能阶段,恒定载荷值达71.9kN ~ 143.1kN,相应的恒定载荷吸能量达4.74kJ ~ 7.61kJ,劈裂作用全程吸能总量达到5.68kJ ~ 11.24kJ;试件轴向劈裂变形稳定,形成放射状“螺旋式”扩展管条或“非螺旋式”扩展管条;试件劈裂过程主要是通过扩径塑性变形、管壁撕裂、管条摩擦、管条塑性展平耗散能量;试件恒定载荷值及相应吸能量的试验结果与理论分析结果相符合。由此,抗卷曲条件下金属圆管劈裂过程可实现恒定载荷的高效吸能作用。
英文摘要:
      In order to develop small components with high specific energy absorption, the deformation and energy-absorption properties of axial splitting and curling inhibition of metal circular tubes were studied with the tubes which were 26 mm in diameter and 3 mm or 4 mm in thickness. The energy absorption principle was analyzed by the energy method. The results show that there are two typical load stages in load-displacement curves, “fluctuant axial load” and “constant axial load”, and constant axial load reaches up to71.9kN ~ 143.1kN. The energy absorption value with constant load reaches up to 4.74kJ ~ 7.61kJ and the total value of energy absorption reaches up to 5.68kJ ~ 11.24kJ. The axial splitting specimens deform stably, producing radially spiral or straight strips. Axial splitting behavior dissipates energy by plastic deformation of diameter expansion, splitting of the tube wall, strip friction and plastic unbend of strips. The theoretical value of constant axial load and energy absorption is close to experimental value of that. The study presents that, the process of axial splitting and curling inhibition of metal circular tubes can achieve efficient energy-absorption action with constant axial load.
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