Longitudinal crack of drill pipe box joint is brittle fracture at low stress.
钻杆接头的各种纵向开裂属于低应力脆性断裂。
The longitudinal shear stress is uniform distribution at the rage of element length;
组合板叠合面上的粘结应力在单元长度范围内是均匀分布的；
The longitudinal shear stress is uniform distribution at the rage of element length;
组合板叠合面上的粘结应力在单元长度范围内是均匀分布的；
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