Deformation Histories Relevant to Multipass Girth Welds: Temperature, Stress and Plastic Strain Histories
Deformation Histories Relevant to Multipass Girth Welds: Temperature, Stress and Plastic Strain Histories
复制标题
与多道环焊缝相关的变形历史记录：温度、应力和塑性应变历史记录
DOI：
10.4028/www.scientific.net/msf.681.61
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
J. Gunnars
中科院分区：
文献类型：
--
作者：
J. Mullins;J. Gunnars
众所周知，通过焊接模拟预测的残余应力对材料模型的选择很敏感。最近的工作表明，当使用不同类型的硬化模型（各向同性、运动学或混合模型）时，预测的残余应力曲线存在很大差异。需要有关焊接过程中存在的确切变形条件的更多信息。我们考虑两个多道不锈钢环焊缝的有限元模型。记录焊接材料和热影响区域 (HAZ) 中的温度、应力和塑性应变历史记录。据观察，焊缝和热影响区中的材料会经历三到五个主动塑性变形周期，然后是纯弹性热循环。应力状态从双轴压缩到三轴拉伸变化。这些变形历史被用作讨论制定合适的材料测试计划和随后的本构建模的基础。
Residual stresses predicted from welding simulations are known to be sensitive to the choice of material model. Recent work has shown large differences in the predicted residual stress profile when different types of hardening model are used (isotropic, kinematic or mixed models). More information is required regarding the exact deformation conditions that exist during welding. We consider finite element models of two multi-pass, stainless steel girth welds. Temperature, stress and plastic strain histories are recorded in the weld material and in the heat affected region (HAZ). Material in the weld and HAZ is observed to undergo three to five cycles of active plastic deformation followed by thermal cycling that is purely elastic. The stress state varies from biaxial compression to triaxial tension. These deformation histories are used as the basis for a discussion of the formulation of a suitable material testing schedule and subsequent constitutive modelling.