基于压力容器自紧前后金属内衬的应力分析,利用子模型方法建立了含内衬表面圆裂纹的有限元模型,使用区域积分法计算了其在工作压力下裂纹前缘的J积分值,研究是否采用自紧工艺和不同自紧压力值情况下的裂纹尖端强度.结果表明:经过自紧工艺处理后裂纹前缘的J积分值将明显提高,且随自紧压力值的增大而增大；随着裂纹尺寸的增大,相应的J积分值也增大,并且沿裂纹前缘的J积分曲线变陡.由此说明自紧工艺压力值的提高和裂纹尺寸的增加均增大了内衬开裂的风险,因此复合材料缠绕压力容器自紧工艺压力值的确定需进行金属内衬的断裂分析.
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