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Numerical Analysis and Experimental Studies on the Residual Stress of W/2024Al Composites

机译：W / 2024Al复合材料残余应力的数值分析与实验研究

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摘要

W/2024Al composites can be used for radiation shielding with desirable mechanical properties such as high strength, excellent corrosion resistance, and low density. The quench-induced residual stresses in W/2024Al composites were studied by experimental measurements and numerical analysis using ABAQUS software. Due to the accurate calculation of heat transfer coefficients and the established constitutive equation for description of the variation of yield stress at elevated temperature with different strain rates, the prediction of residual stresses in as-quenched composite blocks achieved by finite element method (FEM) is reliable. Moreover, X-ray diffraction and crack-compliance method were carried out to measure the stresses that developed at the surface and interior of the composites to validate the simulation results. Quenching residual stresses of composite blocks were investigated by taking the influence of quenching medium temperature into consideration. In addition, a comparative study on residual stress magnitudes of as-quenched 2024Al and W/2024Al composites was conducted, and the results show that stress magnitudes of W/2024Al composites are lower than that of 2024Al due to lower thermal gradients during the quenching process.
机译：W / 2024Al复合材料可用于具有理想机械性能（例如高强度，出色的耐腐蚀性和低密度）的辐射屏蔽。通过实验测量和使用ABAQUS软件的数值分析，研究了W / 2024Al复合材料中淬火引起的残余应力。由于传热系数的精确计算和建立的本构方程来描述高温下不同应变速率下屈服应力的变化，因此通过有限元方法（FEM）可以预测淬火复合材料块中的残余应力。可靠。此外，通过X射线衍射和裂纹顺应性方法测量了复合材料表面和内部产生的应力，从而验证了模拟结果。考虑到淬火介质温度的影响，研究了复合砌块的淬火残余应力。此外，对淬火后的2024Al和W / 2024Al复合材料的残余应力大小进行了比较研究，结果表明，由于淬火过程中较低的热梯度，W / 2024Al复合材料的应力大小低于2024Al。 。

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