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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Crack propagation of Mg-Li alloys by impact load
QU Zhi-ming(曲志明)1, LIANG Xiao-ying(梁晓颖)1, ZHOU Xin-quan(周心权)2, SHI San-yuan(史三元)1

1. School of Civil Engineering, Hebei Engineering University, Handan 056038, China;
2. State Key Laboratory of Coal Resource and Safe Mining, China University of Mining and Technology, Beijing 100083, China

Abstract:Under impact load, using energy estimation and updated finite element method, the crack propagation of Mg-Li alloys was studied, and the relations between high speed impact, time interval and crack propagation velocity were deduced. The effects of impact pattern characteristic parameters such as impact range and time interval on impact fatigue crack growth and propagation rates were discussed. The results show that with the development of crack length, the crack propagation rate along the central sample alloy swiftly increases to the maximum. Then, the crack of other parts has different rate variations. The calculation and simulation results fit well with the experimental ones, which verifies the validity of energy estimation and updated finite element analysis. Impact loading usually induces materials and accelerates the fatigue crack growth.

 

Key words: crack propagation; Mg-Li alloys; impact load; finite element

ISSN 1672-7029
CN 43-1423/U

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