TY - JOUR
T1 - 基于数字图像相关技术的 SLM-IN718 细观表面裂纹扩展机制研究
AU - Liu, Hui
AU - Sun, Rui
AU - Zhou, Yongkang
AU - Bai, Run
AU - Xia, Mingxing
AU - Cai, Xiaomei
AU - Wang, Feng
AU - Zhang, Wen
N1 - Publisher Copyright:
© 2023 Rare Metals Materials and Engineering Press. All rights reserved.
PY - 2023
Y1 - 2023
N2 - Combined with digital image correlation (DIC) technique, in-situ fatigue tests with different stress ratios (R=0.1 and R=-1) at room temperature were carried out to analyze the mesoscopic surface crack propagation mechanism of selected laser melted Ni-based superalloy (SLM-IN718) in the very high cycle fatigue regime. The results show that, firstly, the DIC analysis results indicate that a plastic strain zone, similar to a butterfly shape, appears at the crack tip when SLM-IN718 is loaded, which is consistent with the result by the Von Mises yield criterion. Secondly, the strain field characteristics and displacement field characteristics in front of the crack tip are analyzed for SLM-IN718, the crack opens when the load reaches 53% and 29% of the maximum load under R=0.1 and R=0, respectively. In addition, a model considering the crack closure effect is developed to evaluate the plastic zone size in front of the crack tip, the calculated values are in good agreement with the measured values. Finally, the surface crack propagation mechanism of SLM-IN718 under low stress conditions is discussed based on DIC analysis results.
AB - Combined with digital image correlation (DIC) technique, in-situ fatigue tests with different stress ratios (R=0.1 and R=-1) at room temperature were carried out to analyze the mesoscopic surface crack propagation mechanism of selected laser melted Ni-based superalloy (SLM-IN718) in the very high cycle fatigue regime. The results show that, firstly, the DIC analysis results indicate that a plastic strain zone, similar to a butterfly shape, appears at the crack tip when SLM-IN718 is loaded, which is consistent with the result by the Von Mises yield criterion. Secondly, the strain field characteristics and displacement field characteristics in front of the crack tip are analyzed for SLM-IN718, the crack opens when the load reaches 53% and 29% of the maximum load under R=0.1 and R=0, respectively. In addition, a model considering the crack closure effect is developed to evaluate the plastic zone size in front of the crack tip, the calculated values are in good agreement with the measured values. Finally, the surface crack propagation mechanism of SLM-IN718 under low stress conditions is discussed based on DIC analysis results.
KW - crack propagation mechanism
KW - digital image correlation technology
KW - in situ fatigue
KW - Ni-based superalloy
KW - selective laser melting (SLM)
UR - http://www.scopus.com/inward/record.url?scp=85176965388&partnerID=8YFLogxK
U2 - 10.12442/j.issn.1002-185X.20230296
DO - 10.12442/j.issn.1002-185X.20230296
M3 - 文章
AN - SCOPUS:85176965388
SN - 1002-185X
VL - 52
SP - 3433
EP - 3441
JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
IS - 10
ER -