A unified creep life prediction method and fracture mechanism for
different notch acuity ratios round bars of high-temperature alloys
under multiaxial stress state
- Dongxu Zhang,
- Menghui Lv,
- Xiaowen Li,
- Jianwei Liang,
- Jiapo Wang,
- Zhixun Wen
Dongxu Zhang
Shaanxi University of Science and Technology
Corresponding Author:zhangdongxu@sust.edu.cn
Author ProfileJianwei Liang
Shaanxi University of Science and Technology
Author ProfileZhixun Wen
Northwestern Polytechnical University School of Mechanics Civil Engineering and Architecture
Author ProfileAbstract
This paper proposes a unified creep rupture life prediction method based
on continuous damage mechanics under multiaxial stress state. Instead of
the traditional method, this method can calculate the skeletal point
location for different size of notches in a uniform way. We also
conducted creep tests on Ni-based superalloy round bar specimens with
different notch parameters, which verified the accuracy of the method.
Meanwhile, we carried out creep rupture mechanism analysis for different
notch sizes by combining finite element simulation with experiment,
which analyzed the stress, damage, and explained the void growth based
on triaxial stress.
