The cracking causes of a U shaped tube heat exchanger were analysed in material compositions, microstructure, properties with the help of optional microscope and SEM.
借助光学和扫描电子显微镜，从材料成分、微观组织和性能角度，分析了U 形管换热器开裂原因。
The mechanic affection on the blast hole walls is simply analysed and cracking propagation caused by shaped charge is explained in this paper.
简单分析了聚能爆破装药在孔内爆破的力学效应，阐明了聚能爆破对岩石定向破裂的控制机理。
It is concluded that the local tensile stress created during quenching process and the stress concentration due to sharp V-shaped notch are the primary reasons of cracking.
认为，淬火过程中产生的局部拉应力加上尖锐V型槽口引起的应力集中是造成开裂的主要原因。
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