Journal
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
Volume 28, Issue 8, Pages 1009-1018Publisher
SPRINGER
DOI: 10.1007/s42243-021-00567-5
Keywords
Forming limit curve; Modified maximum force criterion; Graphical method; Hardening law; Finite element method; Boron steel sheet; Elevated temperature
Categories
Funding
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [107.02-2019.300]
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A new method for predicting forming limit curves (FLCs) at elevated temperatures was proposed, improving the accuracy of FLC prediction at high temperatures through tensile tests at different temperatures and the establishment of mathematical relationships. The predicted FLCs at elevated temperatures were found to agree well with corresponding experimental data.
A new approach for predicting forming limit curves (FLCs) at elevated temperatures was proposed herein. FLCs are often used to predict failure and determine the optimal forming parameters of automotive parts. First, a graphical method based on a modified maximum force criterion was applied to estimate the FLCs of 22MnB5 boron steel sheets at room temperature using various hardening laws. Subsequently, the predicted FLC data at room temperature were compared with corresponding data obtained from Nakazima's tests to obtain the best prediction. To estimate the FLC at elevated temperatures, tensile tests were conducted at various temperatures to determine the ratios of equivalent fracture strains between the corresponding elevated temperatures and room temperature. FLCs at elevated temperatures could be established based on obtained ratios. However, the predicted FLCs at elevated temperatures did not agree well with the corresponding FLC experimental data of Zhou et al. A new method was proposed herein to improve the prediction of FLCs at elevated temperatures. An FLC calculated at room temperature was utilized to predict the failure of Nakazima's samples via finite element simulation. Based on the simulation results at room temperature, the mathematical relationships between the equivalent ductile fracture strain versus stress triaxiality and strain ratio were established and then combined with ratios between elevated and room temperatures to calculate the FLCs at different temperatures. The predicted FLCs at elevated temperatures agree well with the corresponding experimental FLC data.
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