摘要
为进一步精确评估缺口件的疲劳行为,基于应力场强法,针对传统疲劳损伤区域判定存在争议的问题,考虑晶粒尺寸和各点应力对损伤区域的综合作用,提出了一种心形疲劳损伤区域,对权函数和损伤区域界定准则进行了修正,建立了一种新的疲劳寿命预估模型。对泵头体材料40CrNi_(2)MoV进行了疲劳试验和算例验证,结果表明:新方法降低了计算成本,圆孔件和V形缺口件疲劳寿命预测精度分别提高了20%~50%及10%~35%,适用于不同缺口类型的疲劳寿命预测。
To further accurately evaluate the fatigue behavior of notched parts,based on the stress field intensity method,in view of the traditional determination of fatigue damage area is controversial,considering the comprehensive effect of the grain size and stress at each point on the damaged area,a heart-shaped fatigue damage area was proposed,the weight function and damage area definition standards were corrected,a new fatigue life prediction model was established.The fatigue test and example verification of the pump head material 40CrNi_(2)MoV were carried out,the results show that the calculation cost is reduced by the new method,and the fatigue life prediction accuracy of round hole parts and V-shaped notched parts are improved by 20%-50%and 10%-35%,respectively.It is suitable for fatigue life prediction of different notch types.
作者
曾云
黄博文
周思柱
ZENG Yun;HUANG Bo-wen;ZHOU Si-zhu(School of Mechanical Engineering,Yangtze University,Jingzhou 434023,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2023年第9期158-165,共8页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(52174018
51674040)
国家科技重大专项(2016ZX05038-001-LH002)。
关键词
疲劳寿命
应力场强法
心形疲劳损伤区域
缺口件
fatigue life
stress field intensity method
heart-shaped fatigue failure region
notch parts
