Fatigue Induced Alteration of the Superficial Strength Properties of 2024 Aluminum Alloy

• 来源期刊: 材料科学技术学报：英文版
• 学科: 工学
• 关键词: 2024铝合金 疲劳载荷 强度特性 诱发 表面硬度 疲劳应力 机械性能 表面硬化
• 年，卷（期）: 2011,（9）
• 页码范围: 776-784
• 页数: 9页
• 分类号: TG146.21|O346.2
• 语种: 英文

摘要

aluminum alloy 2024 T3 specimens have been subjected to constant amplitude fatigue loading at R=0.1. During fatigue, an appreciable increase of the surface hardness of the material at the meso-scale can be observed and captured by means of nanoindentations. Surface hardness increases with increasing fatigue stress amplitude and advancing number of applied fatigue cycles. Observed increase of specimen surface hardening degree during fatigue causes an evolution of superficial mechanical strength properties of the alloy. Stress-strain curves associated with the evoluting superficial mechanical properties are derived, employing a developed finite element method （FEM）-supported evaluation procedure of nanoindentation experimental results.