During the working process, it bears thermal and mechanical loads simultaneously, because of which it tends to crack and even break.
它在工作过程中，受到热负荷和机械负荷的共同作用，工况恶劣，容易产生裂纹而导致破坏。
The study work is focused on the effect of temperature upon mechanical properties, creep, initiation and propagation of fatigue crack for the valve material.
着重温度对气门材料的力学性能、蠕变和疲劳裂纹形成与扩张的影响等问题进行分析和研究。
Based on the analysis of crack and residual stress, mechanical property of Laser Rapid Forming sample is studied.
在裂纹和残余应力分析的基础上，研究激光快速成形件的力学性能。
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