Size effects on springback behavior of H80 foils

作     者：Zhen-Wu Ma Zi-Yang Cao Jin-Bin Lu Yuan-Jing Zhang Wei Liu Zhen Yin 

作者机构：College of Mechanical EngineeringSuzhou University of Science and TechnologySuzhou 215009China Suzhou Key Laboratory of Precision and Efficient Machining TechnologySuzhou 215009China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2018年第37卷第12期

页      面：1082-1090页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the Foundation of Suzhou University of Science and Technology(No.XKQ2017005) 

主　　题：Foil bending Springback behavior Size effects Hardness increment characterization 

摘      要：Size effects make traditional bending theories infeasible in analyzing the springback behavior of H80 foils in the similarity bending experiment. It is observed that there is a certain critical thickness value, which divides the change trend of springback amount of foils into two opposite parts. In order to reveal the reason for size effects on the springback behavior of H80 foils, the method of hardness increment characterization was applied to describe the deformation distribution of foils. The competition between strengthening effect of geometrically necessary dislocations and weakening effect of surface grains determines the change trend of springback amount with foil thickness. When the thickness of foils is large, the weakening effects dominate the material behavior, resulting in that the springback amount decreases with the decrease in foil thickness. However, when the foil thickness is small, the strengthening effects dominate the springback tendency, leading to a sharp increase in the springback amount. Furthermore, the deformation distribution is disturbed due to the enhanced effects of individual grain heterogeneity with the decrease in the thickness of foils, leading to the large scatter of springback angle after unloading.