沈阳大学学报（自然科学版）2025，Vol.37Issue(2)：93-98,封2,封3,8.
内部气孔对TC17激光粉末增材成形件振动应力场的影响
Influence of Internal Porosity on Vibration Stress Field of TC17 Laser Powder Additive Manufactured Components
李永奎 1武朋达 1陈振林 2王海涛 3鲁志伟 1程明聪 1陈家伟1
作者信息
- 1. 沈阳大学机械工程学院,辽宁 沈阳 110044
- 2. 中国航发沈阳黎明航空发动机有限责任公司,辽宁沈阳 110862
- 3. 广东腐蚀科学与技术创新研究院,广东 广州 510530
- 折叠
摘要
Abstract
The influence of internal defects on fatigue life was addressed through the investigation of the high-frequency vibration stress field in titanium alloy TC17 specimens fabricated by laser powder additive manufacturing.Finite element models of TC17 laser powder additive specimens under high-frequency(1 100 Hz)vibration were constructed,including models both with and without internal porosity.The stress values at characteristic points of the specimens were measured using the small hole method,and the reliability of the finite element model under a displacement load of 4.5 mm was confirmed.Stress concentration was identified on both surface sides at the upper end of the transition arc,with stress concentration gradually alleviated from the outer to the inner part along the thickness direction,and the von Mises stress in the central region was found to be one-eleventh of the load.As the diameter of the porosity was increased and the distance between the porosity and the surface was decreased,the von Mises stress at the porosity was observed to gradually increase,even surpassing that on the surface.A relationship diagram of critical porosity size for corresponding locations was established,and the location of fatigue crack initiation was predicted.关键词
TC17钛合金/激光粉末增材/高频振动应力场/内部气孔/有限元模拟Key words
TC17 titanium alloy/laser powder additive manufacturing/high-frequency vibration stress field/internal porosity/finite element simulation分类
金属材料引用本文复制引用
李永奎,武朋达,陈振林,王海涛,鲁志伟,程明聪,陈家伟..内部气孔对TC17激光粉末增材成形件振动应力场的影响[J].沈阳大学学报（自然科学版）,2025,37(2):93-98,封2,封3,8.
