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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第7期    总第251期    2015年7月

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文章编号:1672-7207(2015)07-2744-06
列车车体铝合金动态力学性能及其对吸能的影响
杨超,朱涛,肖守讷

(西南交通大学 牵引动力国家重点实验室,四川 成都,610031)

摘 要: 为了研究车用5083H111铝合金材料的动态力学性能及其对结构吸能的影响,分别对该材料进行动态冲击拉伸和动态冲击压缩试验,获得不同应变率下的材料本构关系。以车辆防爬吸能结构为载体,采用3种材料模型,对比分析该铝合金材料的动态力学性能对车体吸能结构吸能容量的影响。研究结果表明:5083H111铝合金材料在低应变率情况下存在应变率软化效应,在中低应变率范围内存在应变率软化再强化特性;在高应变率情况下,这种材料表现出明显的应变率强化效应;列车碰撞的应变率数量级范围为0~2,属于中低应变率范围;对于5083H111铝合金制成的车体吸能结构,考虑应变率效应的结构的实际吸能量要比不考虑应变率效应的相同结构的吸能量小。

 

关键词: 5083H111铝合金;动态力学性能;应变率;能量

Dynamic mechanical properties of aluminum alloy used in carbodies of trains and effect on energy absorption
YANG Chao, ZHU Tao, XIAO Shoune

State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China

Abstract:In order to study dynamic mechanical properties of the aluminum alloy 5083H111 and the influence on energy absorption characteristics, dynamic impact tension tests and dynamic impact compression tests were conducted on the material. The material constitutive relations of different strain rates were obtained in terms of the tests. Three material models were performed on the anti-climbing energy absorption structure of railway vehicles. The influence of the material dynamic mechanical properties on the structure energy absorption was investigated. The results show that the aluminum alloy 5083H111 exhibits strain rate softening effect at low strain rates, and possesses the characteristic of first softening and then strengthening in the range of low-middle strain rates. The material presents distinct strengthening effect on the strain rate under the condition of high strain rates. The order of magnitudes of the strain rate for the train collision is 0-2, which belongs to the range of low-middle strain rates. For the energy absorption structure made of the aluminum alloy 5083H111, the practical absorbed energy of the structural model considering the strain rate effect is less than that of the same model without regarding the strain rate effect.

 

Key words: aluminum alloy 5083H111; dynamic mechanical property; strain rate; energy

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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