Thermal relaxation of residual stress of a carbon nanotube reinforced aluminium matrix composite treated by stress peening

摘要

Recently, carbon nanotube (CNT) reinforced aluminum matrix composites have attracted wide and growing attentions to develop a new generation of high-stiffness metallic, high-strength, lightweight materials. With the increasing maturity of fabrication techniques, the potential of the material should be further explored. Stress peening is a special and important shot peening method. It is mainly used in peening forming to fabricate thin parts with complicated shapes, such as sheet with double curvatures, aerofoils. After stress peening, anisotropic compressive residual stress (CRS) fields were induced in peened layers. The CRS field could be considered as a superposition of two stress fields: one is a CRS field introduced by SP, another one is a stress field generated by release of the prestress. So thermal relaxation of CRS of the peened layers might be different in directions [1-3]. However, few investigation have been made on it.