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

Guosong Zhang,Tiantian Guo,Jian Wang,Changhui Mao,Ning Fan

doi:10.3390/ma12172746

Guosong Zhang, Tiantian Guo + Show 3 more

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https://doi.org/10.3390/ma12172746

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Abstract

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.

Highlights

The W/2024Al composite is a type of particle-reinforced aluminum matrix composite (PRAMC)
finite element method (FEM) analysis provided by ABAQUS software has been selected to investigate the stress distribution
Owing to the accurate calculation of heat transfer coefficients and the established constitutive equation for description of the variation of yield stress at various elevated temperatures with different strain rates, the prediction of the residual stress of as-quenched W/2024Al blocks obtained by FEM is reliable

Summary

Introduction

The W/2024Al composite is a type of particle-reinforced aluminum matrix composite (PRAMC)used as a noble candidate for radiation shielding with desirable mechanical properties such as high strength, excellent corrosion resistance, and low density [1,2,3,4]. The W/2024Al composite is a type of particle-reinforced aluminum matrix composite (PRAMC). The mechanical properties of PRAMC can be further improved by use of a high-temperature solution followed by rapid quenching and subsequent aging treatment [5,6]. An unfortunate consequence of heat treatment is the introduction of high-magnitude residual stresses because severe thermal gradients arise when quenching rapidly from the solution heat treatment temperature [7]. The first reason is attributed to the thermal expansion difference between the aluminum matrix and reinforced particles [8,9,10]. Residual stress is known for inducing premature failure through cracking, reducing fatigue strength, evoking stress corrosion or hydrogen cracking, changing the mechanical properties of materials and causing distortion and dimensional variation [14,15,16,17]

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