Study on macroscopic residual stresses in long fibre reinforced aluminum alloy
1.School of Material Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Foundry Institute, RWTH Aachen Universtiy, Aachen 52072, Germany)
Abstract：The macroscopic residual stresses between reinforced and unreinforced zones in long fibre reinforced aluminum samples were measured with the borehole method and simulated with FEM. The results indicate that there exist obvious macroscopic residual stresses in the samples, which are distributed very unequal. It was found that the macroscopic residual stresses at most locations in both the reinforced and unreinforced zones were not harmfully high. However, there were some small region with large tensile residual stresses in the unreinforced zone very close to the boundary. These high tensile residual stresses could reach 120 ～140 MPa in the samples locally reinforced with 50％ long fibre. The influence of fibre volumetric contents in the reinforced zone on the macroscopic residual stresses was analyzed with data comparisons. With increase of fibre volumetric contents the macroscopic residual stresses in the sample increase. The fibre volumetric contents have much greater effects on the maximal residual tensile stress in the sample. If the fibre volumetric contents exceed 65％, the maximal residual tensile stress appearing in the sample will reach more than 200 MPa.
2011, Vol. 32 
