周ABAQUS分析了法兰连接中不同A1包覆层厚度下Al-NiTi复合垫片密封面压紧力的分布,并与同等加载条件下的NiTi垫片、金属石墨缠绕垫片进行了对比.结果表明,相比NiTi垫片,Al包覆层降低了密封面的压紧力,随包覆层厚度增加,降低幅度增加；包覆Al层后,垫片密封面压紧力沿径向分布呈现波纹起伏,随包覆层厚度增加,波动幅度增加；Al-NiTi复合垫片内外侧附近出现密封压紧力急剧上升的突变,且随垫片厚度减少,突变值增加,这有利于提高密封效果；Al包覆层厚度为0.2 mm时,密封面压紧力数值较为理想,甚至超过NiTi垫片和金属石墨缠绕垫片.%The contact stress distributions of Al-NiTi gaskets were studied in flange joints with different aluminum cover thickness using finite element analysis ( ABAQUS) , and the conclusions were compared with that of spiral-wound gasket and NiTi gasket. The results show that gasket contact stress decreases with increasing thickness of the cover. Contact stresses fluctuate along the radial direction after gaskets are covered with aluminum sheet, and the range of fluctuation enlarges with the increasing thickness of the cover. Contact stress at the edge of Al-NiTi gasket increases sharply, and thin cover results in higher increment, which is benefit for sealing performance of the gasket. When the thickness of aluminum cover is 0. 2 mm, gasket contact stress is reasonable, e-ven beyond the stress of NiTi gasket or spiral-wound gasket.
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