Thermal Expansion Analysis Based on Forming Limit Diagram for Improving the Formability of Automotive Hot-forming Advanced High Strength Steel Parts

2014 ◽  
Vol 50 (24) ◽  
pp. 73
Author(s):  
Ying CHANG
Keyword(s):  
Thermal Expansion ◽  
High Strength Steel ◽  
Forming Limit Diagram ◽  
High Strength ◽  
Hot Forming ◽  
Forming Limit ◽  
Advanced High Strength Steel

Establishment and Application of Forming Limit Diagram of Multi-Gauge Laser Tailor-Welded Blanks

2010 ◽  
Vol 97-101 ◽  
pp. 420-425
Author(s):  
Wei Chen ◽  
S. Cheng ◽  
Y. Ding ◽  
Y.Q. Guo ◽  
L. Xue
Keyword(s):  
High Strength Steel ◽  
Research Method ◽  
Forming Limit Diagram ◽  
High Strength ◽  
Failure Criteria ◽  
Limit Strain ◽  
Measuring System ◽  
Forming Limit ◽  
Forming Process ◽  
Tailor Welded Blanks

The method for establishing the forming limit diagram (FLD) of multi-gauge high strength steel laser tailor-welded blanks (LTWB) is introduced based on analyzing the failure mechanism of multi-gauge LTWB. The Nakazima test is performed to generate the limit strain of multi-gauge high strength steel LTWB. By means of the ARGUS strain measuring system, the limit strain is measured and the FLD of LTWB is plotted subsequently. The FLD established by the Nakazima test is introduced into the FEA forming process as the failure criteria. Compared with the predicted result of the FLD of thinner metal, better correlation between the simulation and experimental results is indicated by adopting the FLD of LTWB as the necking criteria, which also reveals the validity and practicability of the FLD research method for multi-gauge high strength steel LTWB.

Hot Forming Analysis of Car Door Bar for Ultra High Strength Steel

2010 ◽  
Vol 160-162 ◽  
pp. 836-841
Author(s):  
Yun Kai Gao ◽  
Da Wei Gao ◽  
You Zhi Deng ◽  
Wei Cao
Keyword(s):  
High Strength Steel ◽  
Thickness Distribution ◽  
High Strength ◽  
Simulation Method ◽  
Hot Forming ◽  
Forming Limit ◽  
Boron Steel ◽  
Shell Elements ◽  
Forming Simulation ◽  
Ultra High Strength Steel

Ultra high strength steel plays an important role of light weighting in automotive industry. The hot forming simulation of car door bar is processed with 22MnB5 ultra high strength boron steel. FEM is built with the 12 nodes shell elements and MAT 106 is selected in LS-DYNA. The hot forming processes include two heat transfers. One is the process from the oven to the tools after the blank is heated. The other is the process after the blank contacts the tools. The hot forming simulation results are obtained by LS-DYNA. The results show that the thickness distribution, the forming limit and the maximum effective plastic strain and other performances attain to standards. It is proved that the hot forming simulation method is correct.

Analysis of hot forming of a sheet metal component made of advanced high strength steel

2013 ◽  
Author(s):  
Sinem Demirkaya ◽  
Haluk Darendeliler ◽  
Mustafa İlhan Gökler ◽  
Murat Ayhaner
Keyword(s):  
Sheet Metal ◽  
High Strength Steel ◽  
High Strength ◽  
Hot Forming ◽  
Advanced High Strength Steel ◽  
Metal Component ◽  
Sheet Metal Component

scholarly journals Prediction of Strain Limits via the Marciniak-Kuczynski Model and a Novel Semi-Empirical Forming Limit Diagram Model for Dual-Phase DP600 Advanced High Strength Steel

2020 ◽  
Vol 66 (10) ◽  
pp. 602-612
Author(s):  
Ilyas Kacar ◽  
Fahrettin Ozturk ◽  
Serkan Toros ◽  
Suleyman Kilic
Keyword(s):  
Forming Limit Diagram ◽  
High Strength ◽  
Forming Limit ◽  
Dual Phase ◽  
Advanced High Strength Steel ◽  
Proposed Model ◽  
Yield Functions ◽  
Semi Empirical ◽  
Prediction Capability ◽  
Anisotropy Coefficients

The prediction capability of a forming limiting diagram (FLD) depends on how the yield strength and anisotropy coefficients evolve during the plastic deformation of sheet metals. The FLD predictions are carried out via the Marciniak-Kuczynski (M-K) criterion with anisotropic yield functions for DP600 steel of various thicknesses. Then, a novel semi-empirical FLD criterion is proposed, and prediction capabilities of the criterion are tested with different yield criteria. The results show that the yield functions are very sensitive to anisotropic evolution. Thus, while the FLD curves from the M-K model and the proposed model are not the same for each thickness, the proposed model has better prediction than the M-K model.

A Contrastive Analysis of the Crashworthiness between 22MnB5 and DP590 Front Bumper Inner Plates

2012 ◽  
Vol 538-541 ◽  
pp. 959-964
Author(s):  
Yi Ming Zhao ◽  
Hong Xie ◽  
Jian Ping Lin
Keyword(s):  
High Strength Steel ◽  
Collision Energy ◽  
High Strength ◽  
Hot Forming ◽  
Passive Safety ◽  
Contrastive Analysis ◽  
Advanced High Strength Steel ◽  
Front Side ◽  
Maximum Displacement ◽  
Absorption Section

The front bumper inner plate was researched based on contrastive analysis of the crashworthiness considering using 22MnB5, a typical hot forming AHSS (Advanced High Strength Steel) and DP590, a kind of general high strength steel. In this paper, we contrasted energy absorption, section force, and maximum displacement of the two different front bumper systems in low-speed collision. The analysis shows the front bumper inner plate using hot forming AHSS can improve the crashworthiness of automobiles and make it more balanced and reasonable to transfer collision energy and force. As a result, the maximum displacement of the front bumper system decreases and other parts such as front side rails can be safer. Thus, using hot forming AHSS in designing a front bumper inner plate can improve the passive safety of automobiles.

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