深海耐压舱室寿命估算

Life Estimation of Deep Sea Pressure Cabin

耐压舱室在深海中下潜一定深度和收回过程中,受到的水压可以简化为底周期循环应力。在该循环应力作用下,根据断裂力学理论和结构损伤-安全设计原理,以临界裂纹尺寸的设计方法结合具体工程应用案例计算设备寿命,得出在一定初始裂纹深度和长度下设备的理论使用次数。采用计算机程序实现迭代计算。此应用案例在疲劳的可靠性计算中具有一定的工程指导意义。

When pressure cabin is diving into a certain depth and diving back,the external water pressure can be simplified as the low cycle pressure.Combined with specific engineering applications,based on the fracture mechanics theory and the principle of structure damage safe design,the critical size is used to calculate the device life under the condition of cycle pressure.The device usage time in theory is obtained under the condition of a certain initial crack depth and length.The computer program is used to realize the iterative calculation.This application has effect on the engineering in the fatigue reliability calculation.