Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests
Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests
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DOI：
10.1016/j.matdes.2013.02.020
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发表时间：
2013-08-01
影响因子：
8.4
通讯作者：
Zghal, Ali
中科院分区：
文献类型：
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作者：
Abbassi, Fethi;Mistou, Sebastien;Zghal, Ali
本研究的目的是通过解决颈缩过程中延性损伤演化的影响，对简单和复杂的载荷测试期间的断裂和不稳定性进行分析。在此背景下，开发了一种改进的实验方法，并成功用于评估单轴和双轴拉伸试验期间变形的局部化。双轴拉伸试验是使用双轴试验机加载的十字形样品进行的。在本实验研究中，立体图像相关技术用于生成样本表面内的异质变形图。使用扫描电子显微镜来评估断裂机制和微孔洞的生长。开发了单轴和双轴拉伸试验的有限元模型，其中延性损伤模型 Gurson-Tvergaard-Needleman（GTN）用于描述涉及损伤演化的材料变形。实验与仿真结果的比较表明了有限元模型预测失稳现象的准确性。先进的测量技术有助于更好地了解延性断裂机制。 (C) 2013 Elsevier Ltd. 保留所有权利。
The aim of the presented investigations is to perform an analysis of fracture and instability during simple and complex load testing by addressing the influence of ductile damage evolution in necking processes. In this context, an improved experimental methodology was developed and successfully used to evaluate localization of deformation during uniaxial and biaxial tensile tests. The biaxial tensile tests are carried out using cruciform specimen loaded using a biaxial testing machine. In this experimental investigation, Stereo-Image Correlation technique has is used to produce the heterogeneous deformations map within the specimen surface. Scanning electron microscope is used to evaluate the fracture mechanism and the micro-voids growth. A finite element model of uniaxial and biaxial tensile tests are developed, where a ductile damage model Gurson-Tvergaard-Needleman(GTN) is used to describe material deformation involving damage evolution. Comparison between the experimental and the simulation results show the accuracy of the finite element model to predict the instability phenomenon. The advanced measurement techniques contribute to understand better the ductile fracture mechanism. (C) 2013 Elsevier Ltd. All rights reserved.