首页|采用延性损伤模型和数值方法预测Ni-Cr基合金在温成形条件下的断裂极限

采用延性损伤模型和数值方法预测Ni-Cr基合金在温成形条件下的断裂极限

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为了确定IN625合金的安全成形和断裂极限,在300和673 K下分别进行拉伸成形和深拉延成形实验.将实验获得的基于应力的断裂成形极限图(FFLD)转变为基于应力的σ-FFLD和有效塑性应变(EPS)跟三轴度(η)的关系曲线,以消除断裂极限对应变的过度依赖.为了预测断裂极限,校准7种不同的损伤模型.结果显示,Oh模型对断裂轨迹的预测能力最好,绝对误差最小.虽然实验得到的断裂极限仅用于数值分析,但没有一个损伤模型预测整个应力三轴度范围(0.33<η<0.66)的断裂应变.在不同的温度和润滑条件下深拉延成形圆柱杯,深拉延工艺窗口有助于确定起皱、安全和断裂区域.在润滑条件下,673 K时达到最大的拉延比2.利用Hill 1948各向异性屈服函数对拉伸成形和深拉延成形过程的数值预测结果均在可接受的误差范围内.
Prediction of fracture limits of Ni-Cr based alloy under warm forming condition using ductile damage models and numerical method
The stretch forming and the deep-drawing processes were carried out at 300 and 673 K to determine the safe forming and fracture limits of IN625 alloy. The experimentally obtained strain-based fracture forming limit diagram (FFLD) was transformed into a stress-based (σ-FFLD) and effective plastic strain (EPS) vs triaxiality (η) plot to remove the excess dependency of fracture limits over the strains. For the prediction of fracture limits, seven different damage models were calibrated. The Oh model displayed the best ability to predict the fracture locus with the least absolute error. Though the experimentally obtained fracture limits have only been used for the numerical analysis, none of the considered damage models predicted the fracture strains over the entire considered range of stress triaxiality (0.33<η<0.66). The deep drawing process window helped to determine wrinkling, safe and fracture zones while drawing the cylindrical cups under different temperature and lubricating conditions. Further, the highest drawing ratio of 2 was achieved at 673 K under the lubricating condition. All the numerically predicted results of both stretch forming and deep drawing processes using the Hill 1948 anisotropic yielding function were found to be good within the acceptable range of error.

IN625 alloywarm formingductile damage modelsformabilityforming limit diagramdeep drawingprocessing windowfinite element analysis

Ayush MORCHHALE、Anand BADRISH、Nitin KOTKUNDE、Swadesh Kumar SINGH、Navneet KHANNA、Ambuj SAXENA、Chetan NIKHARE

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Department of Mechanical Engineering, Birla Institute of Technology and Science-Pilani, Hyderabad Campus, Hyderabad, India

Mechanical Engineering Department, Gokaraju Rangaraju Institute of Engineering and Technology, Hyderabad, India

Advanced Manufacturing Laboratory, Institute of Infrastructure Technology Research and Management (IITRAM), Ahmadabad, India

Department of Mechanical Engineering, G. L. Bajaj Institute of Technology and Management, Greater Noida, India

Mechanical Engineering Department, the Pennsylvania State University, Erie, PA, United States

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IN625合金 温成形 延性损伤模型 成形性 成形极限图 深拉延 工艺窗口 有限元分析

ECR/2016/001402

2021

10.1016/S1003-6326(21)65660-1

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(8)
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