期刊
OPTICS AND LASER TECHNOLOGY
卷 99, 期 -, 页码 382-391出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2017.09.026
关键词
Millisecond pulsed laser; Thermal fatigue; Cast iron; Crack evolution
资金
- National Natural Science Foundation of China [11272316, 11502269, 11672304, 11272317]
An approach based on millisecond pulsed laser is proposed for thermal fatigue property evaluation in this paper. Cyclic thermal stresses and strains within millisecond interval are induced by complex and transient temperature gradients with pulsed laser heating. The influence of laser parameters on surface temperature is studied. The combination of low pulse repetition rate and high pulse energy produces small temperature oscillation, while high pulse repetition rate and low pulse energy introduces large temperature shock. The possibility of application is confirmed by two thermal fatigue tests of compacted graphite iron with different laser controlled modes. The developed approach is able to fulfill the preset temperature cycles and simulate thermal fatigue failure of engine components. (C) 2017 Elsevier Ltd. All rights reserved.
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