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。

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Although it is hard to avoid the sources of fracture, the longitudinal fracture failure on the box joint can be prevented if proper measures are taken to prevent further extension of the fracture.

虽然裂纹源很难避免，但如果能够阻止裂纹的扩展，也能够防止钻杆内螺纹接头纵向开裂失效。

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The connection of the two bodies is built around a sequence of full and empty, with a courtyard and an elevator handled as transparent box, as the centerpiece of the joint.

这两个体量之间的联系是围绕着满与空的序列建造的，一个院落和一个透明盒子式的电梯作为这个节点的中央装饰品。

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