双金属接头界面裂纹几何拘束与断裂韧性的统一关联
发布时间：2019-02-10 19:02
【摘要】：针对均质材料A508合金钢定义了可表征面内/面外几何拘束的统一拘束参数Ap,但在双金属接头或异种金属焊接接头中,除了存在面内/面外几何拘束外,还存在材料性能失配引起的材料拘束。针对均质材料定义的统一拘束参数Ap能否同时对几何拘束与材料拘束进行表征还需要进一步的研究。采用有限元数值模拟的方法,对不同面内、面外拘束的双金属接头界面裂纹尖端的等效塑性应变等值线所围面积进行了计算;并用嵌含有GTN损伤模型的有限元法计算了不同拘束状态下双金属接头界面裂纹的J-R阻力曲线和延性断裂韧性。之后,分析了Ap作为几何拘束与材料拘束统一表征参数的可行性。结果表明:Ap可作为统一拘束参数对几何拘束和材料拘束同时进行表征,并可用其建立双金属接头中几何拘束与断裂韧性之间的统一关联线。
[Abstract]:The uniform constraint parameter Ap, which can be characterized by in-plane / out-of-plane geometric constraint, is defined for homogeneous A508 alloy steel. However, in bimetallic joints or dissimilar metal welded joints, in addition to in-plane / out-of-plane geometric restraints, There is also material constraint caused by mismatch of material properties. It is necessary to study whether the uniform constraint parameter Ap can characterize both geometric constraint and material constraint at the same time. The area of equivalent plastic strain isoline at the crack tip of bimetallic joints in different plane and out of plane was calculated by finite element method. The J-R resistance curve and ductile fracture toughness of interfacial crack in bimetallic joints under different restraint states were calculated by finite element method with GTN damage model. Then, the feasibility of Ap as a unified parameter of geometric constraint and material constraint is analyzed. The results show that Ap can be used as a uniform constraint parameter to characterize both geometric constraint and material constraint, and it can be used to establish a unified correlation line between geometric constraint and fracture toughness in bimetallic joints.
【作者单位】： 上海理工大学能源与动力工程学院化工过程机械研究所;华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室;环境保护部华东核与辐射安全监督站;
【基金】：上海市自然科学基金(15ZR1429000) 上海高校青年教师培养计划项目(No.ZZslg15013)资助~~
【分类号】：TG407
[Abstract]:The uniform constraint parameter Ap, which can be characterized by in-plane / out-of-plane geometric constraint, is defined for homogeneous A508 alloy steel. However, in bimetallic joints or dissimilar metal welded joints, in addition to in-plane / out-of-plane geometric restraints, There is also material constraint caused by mismatch of material properties. It is necessary to study whether the uniform constraint parameter Ap can characterize both geometric constraint and material constraint at the same time. The area of equivalent plastic strain isoline at the crack tip of bimetallic joints in different plane and out of plane was calculated by finite element method. The J-R resistance curve and ductile fracture toughness of interfacial crack in bimetallic joints under different restraint states were calculated by finite element method with GTN damage model. Then, the feasibility of Ap as a unified parameter of geometric constraint and material constraint is analyzed. The results show that Ap can be used as a uniform constraint parameter to characterize both geometric constraint and material constraint, and it can be used to establish a unified correlation line between geometric constraint and fracture toughness in bimetallic joints.
【作者单位】： 上海理工大学能源与动力工程学院化工过程机械研究所;华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室;环境保护部华东核与辐射安全监督站;
【基金】：上海市自然科学基金(15ZR1429000) 上海高校青年教师培养计划项目(No.ZZslg15013)资助~~
【分类号】：TG407
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相关期刊论文 前1条
1 杨新岐,秦红珊,霍立兴,张玉凤;非匹配焊接接头中裂纹尖端三维拘束状态分析[J];机械强度;2001年03期
【共引文献】
相关期刊论文 前7条
1 杨杰;王国珍;王艺o，
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