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Thermal relaxation of residual stress in a carbon nanotube reinforced aluminium matrix composite

机译：碳纳米管增强铝基基复合材料中的残余应力的热弛豫

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摘要

Shot peening (SP) is an important method to enhance metallic superficial properties [1-4]. After SP, the introduced compressive residual field (CRS) and change of microstructure could improve the surface properties significantly [5-7], such as surface microhardness, stress corrosion property, fatigue life, ect [8,9]. Stress peening is a special and important shot peening method. It is mainly used in stress peening forming to fabricate thin parts with complicated shapes, such as sheet with double curvatures, aerofoils. In the process of stress peening, specimens were elastically prebended in certain directions for peening forming. And a CRS field, a critical parameter for the component, were induced by high energy "shots". After stress peening, the prestresses were released and the CRS field was changed by elastic recovery. This change 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. Specially, for different materials, the CRS field was different with same peening parameter and prestress [10-15].
机译：射击喷丸（SP）是增强金属表面性质[1-4]的重要方法[1-4]。在SP之后，引入的压缩残余场（CRS）和微观结构的变化可以显着改善表面性质[5-7]，例如表面显微硬度，应力腐蚀性，疲劳寿命，ECT [8,9]。压力喷丸是一种特殊而重要的喷丸法。它主要用于压力喷丸成型，以制造具有复杂形状的薄部件，例如具有双曲率的片材，翼型。在压力喷丸过程中，在某些方向上弹性地预先形成试样以进行喷丸成型。和CRS字段是由高能“射击”引起组件的关键参数。在压力喷丸后，释放预应力，并且通过弹性回收来改变CRS场。这种变化可以被认为是两个应力场的叠加：一个是由SP引入的CRS场，另一个是由预应力释放产生的应力场。特别是，对于不同的材料，CRS场与相同的Peening参数和预应力不同[10-15]。

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