| 代连朋,潘一山,王爱文.金属圆管抗卷曲劈裂变形吸能特性研究[J].实验力学,2017,32(6):839~847 |
| 金属圆管抗卷曲劈裂变形吸能特性研究 |
| Study on Energy Absorption Characteristics of a Metal Circular Tube Subjected to Curling Splitting Deformation |
| 投稿时间：2016-09-27 修订日期：2017-02-22 |
| DOI：10.7520/1001-4888-16-191 |
| 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(51404131)；辽宁省煤炭资源安全开采与洁净利用工程研究中心开放基金(LNTU15KF11) |
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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：试件劈裂吸能过程可分为“波动载荷”吸能阶段和“恒定载荷”吸能阶段，恒定载荷值达71.9~143.1kN，相应的恒定载荷吸能量达4.74~7.61kJ，劈裂作用全程吸能总量达到5.68~11.24kJ；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 safety protection energy absorbing element with small size and high energy absorption ratio and its energy absorption characteristics, the deformation and energy absorption characteristics were experimentally and comparatively studied for two kinds of metal circular tube with the same 26mm inradium but different wall thicknesses (3mm and 4mm respectively) during curling axial splitting deformation process. The energy absorption principle was analyzed by energy method. Results show that the process of specimen's splitting energy absorption can be divided into two stages: “fluctuant load” energy absorption stage and “constant load” energy absorption stage; the constant loads are within a range of 71.9kN-143.1kN; the corresponding energy absorption values reach up to 4.74kJ-7.61kJ; and the total value of energy absorption in splitting process reaches up to 5.68kJ-11.24kJ. Specimen's axial splitting deformation is stable, producing radial spiral expansion strips or non-spiral straight strips. Axial splitting behavior dissipates energy by plastic deformation of diameter expansion, splitting of tube wall, friction among strips and plastic flattening of strips. The experimental values of constant load and corresponding energy absorption agree with experimental results. Therefrom, the splitting process of metal circular tube in curling deformation can achieve efficient energy-absorption action under constant axial loading condition. |
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