油气管道平滑凹陷疲劳试验应变响应分析
Science Technology and Industry(2020)
Abstract
将含深度15%OD平滑凹陷的试验管段进行疲劳试验,并监测凹陷不同部位的应变响应,结果表明:疲劳失效位置出现凹陷边缘位置,失效方式为轴向疲劳裂纹;凹陷中心在疲劳试验过程中,环向受拉,轴向受压;凹陷轴向中间位置和45°中间位置,环向和轴向均为拉应变,而凹陷环向中间位置,环向为拉应变,轴向为压应变;凹陷轴向边缘的环向和轴向均受压,45°边缘的环向和轴向均受拉,而环向边缘在疲劳试验过程中环向受压,轴向受拉.
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