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首页> 外文期刊>Materials Science and Engineering >Modelling and experimental validation of material deformation at different zones of welded structural-steel under multiaxial loading
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Modelling and experimental validation of material deformation at different zones of welded structural-steel under multiaxial loading

机译：多轴载荷下焊接结构钢不同区域材料变形的建模与实验验证

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The fatigue life assessment of welds represents an engineering challenge regarding material inhomogeneity, welding residual stresses, notch stress effects and multiaxial loading conditions. In a weldment due to the nonuniform heating process the material in the weld metal and adjacent regions may exhibit heterogeneous mechanical properties. This makes the local stress-strain evaluations even more complicated under fatigue loading conditions. Therefore it is essential to characterize the variation of mechanical and particularly cyclic properties of the material in the vicinity of the weld notches. To improve the predictions of fatigue life estimation, numerical modelling techniques are complemented by experimental studies.The present work investigates the effects of weld induced microstructure variations in the multiaxial cyclic properties of the ferritic-pearlitic steels. A numerical model to describe the cyclic plastic deformation behavior of constructional steel S355J2H is established. Two material states present in the vicinity of a weld, the base material and the heat-affected zone (HAZ) are considered. Special attention was given to the non-proportional hardening of the material. Experimental results for both materials are used to calibrate the isotropic and kinematic hardening constants in the Chaboche plasticity model. The calibrated model is applied to multiaxial loading conditions. To account for non-proportional hardening effects, a constitutive motivated parameter by Tanaka is implemented. Therefore, first, the proportional results are reproduced and then the non-proportionality parameter is incorporated into the isotropic hardening law. The results of the calibration procedure for both proportional and non-proportional multiaxial load paths are discussed regarding its applicability in fatigue analysis and limitations of the model.
机译：焊缝的疲劳寿命评估代表了有关材料不均匀性，焊接残余应力，凹口应力效应和多轴加载条件的工程挑战。在由于不均匀的加热过程引起的焊接中，焊接金属和相邻区域中的材料可以表现出异质的机械性能。这使得局部应力 - 应变评估在疲劳负载条件下更加复杂。因此，必须表征焊接槽口附近的材料的机械和特别环状特性的变化。为了改善疲劳寿命估计的预测，通过实验研究补充了数值建模技术。目前的作品研究了焊接诱导微观结构变化在铁素体珠子钢的多轴环状特性中的影响。建立了一种描述结构钢S35592H循环塑性变形行为的数值模型。考虑了焊缝附近的两种材料状态，基材和热影响区域（HAZ）。特别注意材料的非比例硬化。两种材料的实验结果用于校准Chaboche塑性模型中的各向同性和运动硬化常数。校准模型应用于多轴加载条件。为了考虑非比例的硬化效果，实施了Tanaka的组成型动机参数。因此，首先，再现比例结果，然后将非比例参数结合到各向同性的硬化法中。关于其在模型的疲劳分析和限制的适用性讨论了比例和非比例多轴负荷路径的校准程序的结果。

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