Theoretical Research on Circumferential Stress of Four-point Bending Specimen of Unequal Thickness
LIAN Zhanghua, ZHANG Jin, WANG Yuhai, ZHANG Qiang, LIU Yonggang
西南石油大学学报(自然科学版) . 2020, (1): 161 -169 .  DOI: 10.11885/j.issn.1674-5086.2018.08.30.03