【摘要】 基于临界面模型的方法提出一个新的多轴低周疲劳损伤准则。该准则与目前的临界面法不同的是,在预测多轴低周疲劳寿命的模型中,同时考虑临界面上最大剪应变和正应变在不同加载路径下对多轴低周疲劳损伤的贡献。试验结果表明,文中提出的多轴低周疲劳寿命预测模型,对于GH4169合金高温多轴疲劳寿命估算具有较高的准确性。更多还原

【Abstract】 The multiaxial fatigue behavior on notched specimen of GH4169 super alloy has been studied.Full reversed axial,torsional strain controlled fatigue testes were conducted at 650 ℃ by using a MTS 809 tension-torsional servo-controlled electro-hydraulic testing machine with proportional and non-proportional loading.The phase between axial strain and torsional strain were 0° in-phase(proportional) and 45°,90° out-of-phase(non-proportional) respectively.A new multiaxial fatigue damage criterion based on the critical approach has been proposed.The results of life prediction show that the new fatigue life prediction model are validated with experimental results.更多还原