金属圆管抗卷曲劈裂变形吸能特性研究

发布时间：2018-12-26 11:24

【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。
[Abstract]:In order to study the small size and high energy absorption ratio of the safety protective energy absorption elements and their energy absorption characteristics, the deformation and energy absorption characteristics of two types of metal circular tubes with wall thickness of 3mm and 4mm and inner diameter of 26mm in the process of crimp axial splitting were studied. The principle of energy absorption is analyzed by energy method. The results show that the process of splitting and absorbing energy can be divided into "wave load" stage and "constant load" stage. The constant load value is 71.9 ~ 143.1kN, and the corresponding constant load energy absorption is 4.74 ~ 7.61kJ. The total amount of energy absorption in the whole process of splitting is 5.68 ~ 11.24 kJ; The axial splitting deformation of the specimen is stable and the radial "spiral" or "non-spiral" expanded tube strip is formed, and the splitting process of the specimen is mainly through expanding plastic deformation, tearing the pipe wall, friction of the tube strip, and plastic dissipation energy dissipation of the tube strip. The experimental results of the constant load and the corresponding absorbing energy of the specimen are in agreement with the theoretical analysis. Thus, the split process of metal pipe under crimp condition can achieve high energy absorption under constant load.
【作者单位】：辽宁工程技术大学力学与工程学院;
【基金】：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)
【分类号】：TG115

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