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轴向压缩下焊接铝十字接头断裂行为的实验与数值研究

Experimental and Numerical Investigation of the Fracture Behavior of Welded Aluminum Cross Joints under Axial Compression.

作者信息

Panwitt Hannes, Heyer Horst, Sander Manuela

机构信息

Institute of Structural Mechanics, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Albert Einstein-Str. 2, 18059 Rostock, Germany.

出版信息

Materials (Basel). 2020 Sep 27;13(19):4310. doi: 10.3390/ma13194310.

DOI:10.3390/ma13194310
PMID:32992532
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7579255/
Abstract

In age-hardened high-strength aluminum alloys, the area with and around a joint has a large impact on the load-bearing capacity of a welded structure. Therefore, in this study the fracture behavior of welded EN AW 6082 T6 plates is investigated experimentally and numerically. From butt joints, smooth and notched tensile specimens as well as shear specimens have been manufactured and tested for the base material (BM), heat-affected zone (HAZ) and fusion zone (FZ). With numerical simulations of these tests, the dependency of the fracture strain on the stress triaxiality is determined, and two phenomenological fracture criteria are calibrated. Whereas the one-parameter Rice-Tracey/Cockcroft-Latham (RTCL) criterion describes the behavior of the tension specimens as accurately as the two-parameter Bao-Wierzbicki (BW) criterion, the BW criterion is more accurate for shear tests. Subsequently, the material model is validated on axial compression tests of welded X-profiles. The experiments comprise tests with different plate thicknesses (8 mm, 10 mm and 12 mm) and varying strain rates (up to 1/s locally), showing the same behavior for all specimens. After crack initiation within the FZ, coalescence of cracks leads to crack growth in axial direction and a subsequent reduction of the load-bearing capacity. This behavior is reproduced well by the numerical simulations with the BW criterion, whereas simulations with the RTCL criterion predict fracture initiation at too high displacements. Overall, the results show the strong influence of the ductility of the FZ on the crushing behavior of welded X-profiles.

摘要

在时效硬化高强度铝合金中，接头处及其周围区域对焊接结构的承载能力有很大影响。因此，在本研究中，对EN AW 6082 T6焊接板材的断裂行为进行了实验和数值研究。从对接接头制备了光滑和带缺口的拉伸试样以及剪切试样，并对母材（BM）、热影响区（HAZ）和熔合区（FZ）进行了测试。通过对这些试验的数值模拟，确定了断裂应变对应力三轴性的依赖性，并校准了两种唯象断裂准则。单参数的莱斯 - 特雷西/科克罗夫特 - 拉瑟姆（RTCL）准则对拉伸试样行为的描述与双参数的鲍 - 维尔兹比奇（BW）准则一样准确，但BW准则在剪切试验中更准确。随后，在焊接X型材的轴向压缩试验中对材料模型进行了验证。实验包括不同板厚（8mm、10mm和12mm）以及不同应变率（局部高达1/s）的试验，所有试样表现出相同的行为。在熔合区内裂纹萌生后，裂纹合并导致轴向裂纹扩展并随后降低承载能力。采用BW准则的数值模拟很好地再现了这种行为，而采用RTCL准则的模拟预测在过高位移时发生断裂起始。总体而言，结果表明熔合区的延性对焊接X型材的挤压行为有很大影响。

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本文引用的文献

1
Combined Calorimetry, Thermo-Mechanical Analysis and Tensile Test on Welded EN AW-6082 Joints.对焊接的EN AW-6082接头进行量热法、热机械分析和拉伸试验联用
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