Investigations on the Failure Behavior of Specimens Containing Crack Fields Made by Additive Manufacturing

L. Stumpfrock, U. Weber, S. Weihe, M. Seidenfuss, Linda Mally
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Abstract

Laminar and quasi-laminar orientations of hydrogen flakes with an inclination up to 16° to the pressure retaining surface were found in pressure vessels of Belgian nuclear power plants. Because of their orientation, these crack tips undergo predominantly mixed-mode loading conditions under internal pressure and the induced stress and strain fields of the single crack tips influence each other. In a former paper, the failure behavior under mixed-mode loading conditions was investigated at RT (Room Temperature) in the upper shelf and in the lower transition region of the steel 22NiMoCr3-7, respectively. In this paper, the failure behavior will be shown for many different levels of material toughness (beginning from upper shelf down to the lower shelf region) on experiments. Additionally numerical simulations are carried out with extended micromechanical based damage mechanics models. For the description of ductile failure mode the Rousselier model is used and the Beremin model to calculate the probability of cleavage fracture. To simulate the sensitivity for low stress triaxiality damage by shear loading, the damage mechanics model was enhanced with a term to account for damage evolution by shear. For numerical simulations in the transition region of brittle-to-ductile failure a coupled damage mechanics model (enhanced Rousselier & Beremin) will be used. In this paper, the current state of the ongoing research project is presented.
含裂纹场的增材制造试样破坏行为研究
在比利时核电站的压力容器中发现了层流和准层流取向的氢片,其与保压面倾斜度可达16°。由于它们的取向,这些裂纹尖端在内压下主要处于混合加载状态,并且单个裂纹尖端的诱导应力场和应变场相互影响。在之前的一篇论文中,分别研究了22NiMoCr3-7钢的上架和下过渡区在室温下混合模式加载条件下的破坏行为。在本文中,将在实验中显示许多不同级别的材料韧性(从上大陆架区域开始向下到下大陆架区域)的破坏行为。此外,采用扩展的微力学损伤力学模型进行了数值模拟。对于韧性破坏模式的描述,采用Rousselier模型和Beremin模型来计算解理断裂的概率。为了模拟剪切作用下低应力三轴损伤的敏感性,在损伤力学模型中增加了剪切作用下损伤演化的项。对于脆性到韧性破坏过渡区域的数值模拟,将使用耦合损伤力学模型(增强Rousselier & Beremin)。在本文中,介绍了正在进行的研究项目的现状。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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