中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 17 Special 1 November 2007 |
（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
