Stress-state dependent fracture characterisation and modelling of an AZ31 magnesium sheet alloy at elevated temperatures
Stress-state dependent fracture characterisation and modelling of an AZ31 magnesium sheet alloy at elevated temperatures
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AZ31 镁板合金在高温下的应力状态相关断裂表征和建模
DOI：
10.1016/j.promfg.2019.02.161
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Dykiert
中科院分区：
文献类型：
--
作者：
Behrens;Chugreev;Dykiert
由于具有较高的比强度，镁合金在汽车工业的轻量化解决方案中具有很高的潜力。对于成形过程的数值设计来说，尽可能精确地描述材料的屈服和断裂行为是很重要的。为了充分表征AZ31镁合金板材在高温下的断裂行为，开发了一种单轴拉伸试验机的加热测试装置。该装置允许调整载荷应用角度，从而在试样中心实现应力变化。为了确定不同温度和不同应力状态下的断裂应变，采用剪切应力试样（也称为蝴蝶试样）进行力学实验。通过数值模拟，确定了在不同加载角度和温度下，裂缝区的比应力发展和应变值，用于标定应力状态裂缝模型。为此，采用了适合描述镁合金特殊流动行为（如压缩-拉伸不对称）的正交各向异性屈服准则CPB06。该方法为基于应力状态的常用裂缝模型的标定提供了充分的数据，并对修正Mohr-Coulomb裂缝模型进行了参数化。
Due to a high specific strength, magnesium alloys have a high potential to be considered for lightweight solutions in automotive industry. For the numerical design of forming processes, it is important to describe the yielding as well as the fracture behaviour of a material as precisely as possible. In order to fully characterise the fracture behaviour of an AZ31 magnesium sheet alloy at elevated temperatures, a heated test setup for uniaxial tensile machines was developed. The setup allows an adjustment of the load application angle whereby a stress variation is achieved in the centre of the specimen. In order to determine the fracture strain for different temperatures and for varying stress states, a shear stress specimen (also known as butterfly specimen) was considered to perform mechanical experiments by means of this setup. Using numerical simulations, the specific stress development and strain value in the fracture zone, which is needed to calibrate stress state fracture models, was determined for each loading angle and temperature. For this purpose, an orthotropic yield criterion CPB06, which is suitable for depiction of the particular flow behaviour of magnesium alloys (e. g. compression-tension asymmetry), was used. By this means, sufficient data for the calibration of common stress state based fracture models could be provided and the MMC- (Modified Mohr-Coulomb) fracture model was parameterised.
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