Prediction of forming limit curve for pure titanium sheet  

纯钛板成形极限曲线的预测（英文）

作　　者：Young-Suk KIM Bong-Hyun LEE Seung-Han YANG 

机构地区：[1]School of Mechanical Engineering, Kyungpook National University [2]Daegu-Gyeongbuk Center, Korea Automotive Technology Institute

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第2期319-327,共9页中国有色金属学报（英文版）

基　　金：supported by the National Research Foundation of Korea (NRF) granted by the Korea government [2014R1A2A2A01005903];Priority Research Centers Program (2010-0020089);support from a grant [R0003356] (Tuning Professional Support Center in Daegu Metropolitan City) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea)

摘　　要：Commercially pure titanium（CP Ti） has been actively used in the plate heat exchanger due to its light weight, high specific strength, and excellent corrosion resistance. However, researches for the plastic deformation characteristics and press formability of the CP Ti sheet are not much in comparison with automotive steels and aluminum alloys. The mechanical properties and hardening behavior evaluated in stress-strain relation of the CP Ti sheet are clarified in relation with press formability. The flow curve denoting true stress-true strain relation for CP Ti sheet is fitted well by the Kim-Tuan hardening equation rather than Voce and Swift models. The forming limit curve（FLC） of CP Ti sheet as a criterion for press formability was experimentally evaluated by punch stretching test and analytically predicted via Hora＇s modified maximum force criterion. The predicted FLC by adopting Kim-Tuan hardening model and appropriate yield function shows good correlation with the experimental results of punch stretching test.商业纯钛(CP Ti)由于其轻质,高比强度和优异的耐腐蚀性能而被广泛应用于板式换热器。然而,与汽车用钢和铝合金相比,关于CP Ti板的塑性变形特征和压制成形性的研究相对较少。本文研究与CP Ti板压制成形相关的应力-应变关系及其力学性能和硬化行为。结果表明,CP Ti板的真应力-真应变关系曲线符合Kim-Tuan硬化方程,而不是Voce和Swift模型。通过冲压试验验证CP Ti板的成形极限曲线(FLC)可作为压制成形性的标准,并可通过Hora改进的最大力准则来分析预测。通过Kim-Tuan硬化模型和合适的屈服函数预测的FLC与冲压试验的结果吻合良好。

关 键 词：Kim-Tuan hardening equation Hora modified maximum force criterion pure titanium sheet forming limit curve 

分 类 号：TG146.23[一般工业技术—材料科学与工程]