应变增长现象会对容器安全形成威胁.以往研究涉及的应变增长现象大多在壳体弹性变形范围内,本文中实验观察到球壳塑性变形时的应变增长现象,应变增长系数(最大应变值与第一个应变峰的比值)最大值达到1.16.实验还获得了容器内壁压力-时间曲线,并利用球壳响应理论分析出应变增长现象是由容器内壁的周期性多脉冲载荷引起的,该载荷存在3个较明显的脉冲,前两个脉冲对应变增长现象起主要作用.%Strain growth,whose related research has so far been concerned mostly with its behavior during the plastic response inside a spherical shell,poses a threat to the safety of explosion containment vessels.In the present work,the strain growth of the spherical vessel during the plastic response was observed by the experiment,and the strain growth factor (the ratio of the maximum strain of the strain curve to the first peak strain) reached up to 1.16.It was found through the theoretical analysis on the spherical shell response that it was the blast loading with three periodic pulses on the inner wall of the spherical vessel that brought about the strain growth,and that the first two pulses were mainly responsible for the strain growth.
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