Plastic Collapse by Four-Hinge Mechanism. The four-hinge collapse mechanism is illustrated in Fig. 2. The formation of four plastic hinges allows collapse to occur while the four segments of the tube separated by the hinges remain rigid. As shown, this mechanism produces the well known dog bone final post-collapse configuration. This collapse mechanism has been proposed previously in addressing the problem of buckle propagation in submarine pipelines.
对钻井、完井方面不是很了解，大致看了一下，翻译成“四向铰合机理”不知是否合适，仅供参考
