焊接接头热影响区裂纹启裂行为的探讨
Discussion of HAZ crack initiation behaviour of mismatched welded joints
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摘要: 针对结构完整性评定中焊接接头难以评估问题，文中通过非匹配焊接接头“三材料”结构模型，建立热影响区中心裂纹启裂临界应力的失效评定图预测方法. 基于有限元ABAQUS软件分析，研究焊接接头热影响区裂纹启裂. 结果表明，高匹配焊缝促进热影响区裂纹启裂，软化的热影响区促进热影响区裂纹启裂，低匹配焊接接头，热影响区软化时，增加热影响区宽度促进热影响区裂纹启裂；热影响区硬化时，减小热影响区宽度促进热影响区裂纹启裂. 高匹配焊接接头，热影响区无论软化、硬化，增加热影响区宽度均促进热影响区裂纹启裂.
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关键词:
- 非匹配|热影响区|失效评定图|临界应力
Abstract: For structural integrity assessment of welded joints is difficult to assess, the failure assessment diagram prediction method for the critical stress of heat affected zone crack initiation of welded joints is established by using the "tri-material" assumption model of mismatched welded joints. Based on the finite element analysis of ABAQUS software, the crack initiation in the heat affected zone of welded joint is studied. Results indicated that over-matching weld promoted the HAZ crack initiation in mismatched welded joints. HAZ strength softening promoted the HAZ crack initiation in mismatched welded joints. When MW<1, MH<1, with the increase of heat affected zone width, it promoted the HAZ crack initiation, MH>1, with the decrease of heat affected zone width, it promoted the HAZ crack initiation. When MW>1, whether HAZ strength softening or hardening, with the increase of heat affected zone width, they promoted the HAZ crack initiation. -
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