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关于焊接塑性应变的计算与讨论

Calculation and discussion of welding plastic strain

  • 摘要: 采用数值模拟的方法计算了平板熔焊对接接头的纵向塑性应变的分布和动态演变过程。就目前学者所提出的焊缝存在的拉伸塑性应变的观点与传统的残余压缩塑性应变理论所存在的分歧,对比了考虑熔化现象和不考虑熔化现象两种情况,分析了焊缝中心和热影响区焊接准稳态时纵向塑性应变的变化规律。结果表明,考虑熔化现象和不考虑熔化现象纵向塑性应变结果基本相同,在焊接加热过程中所产生的压缩塑性应变始终大于冷却过程中所产生的拉伸塑性应变,在考虑熔化现象的情况下,其热影响区也始终处于压缩塑性应变状态,只是在移动热源经过后,其压缩塑性应变值在冷却的过程中有所减小。

     

    Abstract: Numerical simulation method is employed to discuss welding longitudinal plastic strain distribution.Residual compressive plastic strain presents in the weld from traditional views, but the new viewpoint supports that the tensile plastic strain presents in the weld.Based on the two different viewpoints, the welding longitudinal plastic strain distribution is analy sed with and without the fusion phenomenon according to the calculation results.The simulated results show that there exists little different in the two situations, and compressive plastic strain in the heating process is larger than tensile plastic strain in the cooling process.When a fusion phenomenon is considered, the heat affected zone still keeps the compressive plastic strain all the time, and only the plastic strain value in the cooling process is smaller than the one in the heating process.

     

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