TY - JOUR
T1 - Size effect on the shear damage under low stress triaxiality in micro-scaled plastic deformation of metallic materials
AU - Wang, Jilai
AU - Li, Chuanzheng
AU - Wan, Yi
AU - Zhang, Chengpeng
AU - Ran, Jiaqi
AU - Fu, M. W.
N1 - Funding Information:
The authors gratefully acknowledge funding supported by the Fundamental Research Funds of Shandong University , the Young Scholars Program of Shandong University , the Shenzhen Science and Technology Program ( JCYJ20170818104529523 ), the China Postdoctoral Science Foundation funded project ( 2018 M632672 ), Shandong Provincial Natural Science Foundation ( ZR2019BEE062 ), Natural Science Foundation of Jiangsu Province ( BK20190202 ), National Natural Science Foundation of China (Grant No. 1705333 , 51835011 , 51575465 ), the Natural Science Foundation of Guangdong Province (Grant No. 2017A030310352 ).
Funding Information:
The authors gratefully acknowledge funding supported by the Fundamental Research Funds of Shandong University, the Young Scholars Program of Shandong University, the Shenzhen Science and Technology Program (JCYJ20170818104529523), the China Postdoctoral Science Foundation funded project (2018 M632672), Shandong Provincial Natural Science Foundation (ZR2019BEE062), Natural Science Foundation of Jiangsu Province (BK20190202), National Natural Science Foundation of China (Grant No. 1705333, 51835011, 51575465), the Natural Science Foundation of Guangdong Province (Grant No. 2017A030310352).
Publisher Copyright:
© 2020 The Author(s)
PY - 2020/11
Y1 - 2020/11
N2 - Micro-forming is one of the major micro-manufacturing methods with promising application potentials, in which the damage response and fracture behavior need to be insightfully addressed. Among all the damage criteria to predict fracture, GTN model is a widely-used one and able to predict void-dominated fracture in micro-scale deformation. However, it is not very applicable under low stress triaxiality and shear-dominated condition. An in-depth understanding of shear damage and its potential size effect are crucial to explore the micro-scaled damage and fracture mechanisms. This research characterizes the size effect on flow stress via employing a combined constitutive model, and an approach for applying a phenomenological shear damage evolution law to the GTN-Thomason model via considering the size effect is developed. The prediction of micro-scaled fracture in a wide stress triaxiality range is thus enabled. Through simulation and experiment, the proposed model is validated and verified. In addition, stress state parameters including stress triaxiality, Lode parameter, and weight function, are also discussed, and the two damage parameters are analyzed quantificationally to reveal different fracture mechanisms occurring in different stress states and grain sizes. The research thus facilitates the physical insight and in-depth understanding of the size effect on damage evolution and fracture formation in micro-scaled plastic deformation of materials.
AB - Micro-forming is one of the major micro-manufacturing methods with promising application potentials, in which the damage response and fracture behavior need to be insightfully addressed. Among all the damage criteria to predict fracture, GTN model is a widely-used one and able to predict void-dominated fracture in micro-scale deformation. However, it is not very applicable under low stress triaxiality and shear-dominated condition. An in-depth understanding of shear damage and its potential size effect are crucial to explore the micro-scaled damage and fracture mechanisms. This research characterizes the size effect on flow stress via employing a combined constitutive model, and an approach for applying a phenomenological shear damage evolution law to the GTN-Thomason model via considering the size effect is developed. The prediction of micro-scaled fracture in a wide stress triaxiality range is thus enabled. Through simulation and experiment, the proposed model is validated and verified. In addition, stress state parameters including stress triaxiality, Lode parameter, and weight function, are also discussed, and the two damage parameters are analyzed quantificationally to reveal different fracture mechanisms occurring in different stress states and grain sizes. The research thus facilitates the physical insight and in-depth understanding of the size effect on damage evolution and fracture formation in micro-scaled plastic deformation of materials.
KW - Fracture mechanism
KW - GTN model
KW - Micro-scaled deformation
KW - Shear damage
KW - Size effect
UR - http://www.scopus.com/inward/record.url?scp=85090410150&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2020.109107
DO - 10.1016/j.matdes.2020.109107
M3 - Journal article
AN - SCOPUS:85090410150
VL - 196
JO - International Journal of Materials in Engineering Applications
JF - International Journal of Materials in Engineering Applications
SN - 0264-1275
M1 - 109107
ER -