Analysis of forming limits based on a new ductile damage criterion in St14 steel sheets

2015 ◽  
Vol 68 ◽  
pp. 134-145 ◽  
Author(s):  
Xinkai Ma ◽  
Fuguo Li ◽  
Jinghui Li ◽  
Qianru Wang ◽  
Zhangwei Yuan ◽  
...  
Keyword(s):  
Ductile Damage ◽  
Forming Limits ◽  
Damage Criterion ◽  
Steel Sheets ◽  
St14 Steel

Forming Limits of Several High-Strength Steel Sheets under Proportional/Non-Proportional Deformation Paths

2014 ◽  
Vol 939 ◽  
pp. 260-265 ◽  
Author(s):  
Ryutaro Hino ◽  
Satoki Yasuhara ◽  
Yutaka Fujii ◽  
Atsushi Hirahara ◽  
Fusahito Yoshida
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Experimental Results ◽  
Forming Limit ◽  
Type Analysis ◽  
Forming Limits ◽  
Steel Sheets ◽  
Path Dependent ◽  
Forming Limit Curves ◽  
Good Agreement

Forming limits of several high-strength steel (HSS) sheets under non-proportional deformation paths were examined experimentally and predicted analytically. Forming limit curves (FLCs) for 590MPa, 780MPa and 980MPa grade HSS sheets were obtained by performing stretch forming tests under proportional deformation and two types of non-proportional deformation. The experimental results showed strong path-dependent characteristics of FLCs of HSS sheets. Forming limits of equi-biaxially prestrained HSS sheets became markedly lower compared to the original FLCs under proportional deformation, while forming limits of uniaxially prestrained HSS sheets became partially higher than the original FLCs. It was confirmed that Marciniak-Kuczyński type analysis gave reasonably good predictions of forming limits under non-proportional deformation paths. Especially forming limit predictions of equi-biaxially-prestrained sheets showed good agreement with the corresponding experimental results.

scholarly journals Forming Limit Diagrams of Ground St14 Steel Sheets with Different Thicknesses

2012 ◽  
Vol 5 (1) ◽  
pp. 60-64 ◽  
Author(s):  
Ramin Hashemi ◽  
Amir Ghazanfari ◽  
Karen Abrinia ◽  
Ahmad Assempour
Keyword(s):  
Forming Limit ◽  
Forming Limit Diagrams ◽  
Steel Sheets ◽  
St14 Steel

Prediction of fracture limits of IN625 alloy by coupling ductile damage models and anisotropic yielding functions with the classical Marciniak and Kuczyński model

2021 ◽  
pp. 095440542110518
Author(s):  
Ayush Morchhale ◽  
Nitin Kotkunde ◽  
Swadesh Kumar Singh ◽  
Navneet Khanna
Keyword(s):  
Manufacturing Industry ◽  
Forming Limit Diagram ◽  
Ductile Damage ◽  
Inconel 625 ◽  
Forming Limit ◽  
Uniaxial Tensile ◽  
Forming Limits ◽  
Damage Models ◽  
Uniaxial Tensile Testing ◽  
Anisotropic Yielding

The fracture forming limit diagram (FFLD) is gaining special attention in high strength materials where the necking tendency rarely occurs during sheet metal forming processes. In the present work, the classical Marciniak and Kuczyński (MK) model has been modified by coupling it with different ductile damage models (Cockcroft and Latham, Brozzo, Oyane, Ko, Oh, Rice and Tracey, McClintock and Clift) and anisotropic yielding functions (Hill 1948 and Barlat 1989) to predict the fracture limits of Inconel 625 (IN625) alloy at different temperatures. Firstly, uniaxial tensile testing has been conducted for the determination of important mechanical properties. Consequently, stretch forming experiments have been performed to analyze the forming limits of a material. It has been found that the safe and fracture forming limits of the material increased by approximately 17.26% and 22.22%, respectively, on increasing the temperature from 300 to 673 K. From the comparative analysis of different combinations of ductile damage models and yielding functions, the Cockcroft and Latham (C-L) damage model in combination with the Barlat 1989 yielding function helped in best predicting the theoretical FFLD as it displayed the least average root mean square error (RMSE) of 0.033. The other ductile damage models used for predicting the theoretical fracture limits displayed large error; hence, they should not be considered while designing a critical component in the manufacturing industry using IN625 alloy.

Effect of quasi-static pre-strain on electromagnetic forming limits for high strength steel sheets

2017 ◽  
Vol 12 (5/6) ◽  
pp. 436
Author(s):  
Xifan Zou ◽  
Shiwei Yan ◽  
Mengcheng Zhou ◽  
Yu Lei ◽  
Shangyu Huang ◽  
...  
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Electromagnetic Forming ◽  
Forming Limits ◽  
Steel Sheets

Prediction of Forming Limit of Dual-Phase 500 Steel Sheets Using the GTN Ductile Damage Model in an Innovative Hydraulic Bulging Test

JOM ◽  
2018 ◽  
Vol 70 (8) ◽  
pp. 1542-1547 ◽  
Author(s):  
Xiao-Lei Cui ◽  
W. W. Zhang ◽  
Zhi-Chao Zhang ◽  
Yi-Zhe Chen ◽  
Peng Lin ◽  
...  
Keyword(s):  
Damage Model ◽  
Ductile Damage ◽  
Forming Limit ◽  
Dual Phase ◽  
Steel Sheets ◽  
Bulging Test ◽  
Hydraulic Bulging

A hybrid approach for modelling of plasticity and failure behaviour of advanced high-strength steel sheets

2012 ◽  
Vol 22 (2) ◽  
pp. 188-218 ◽  
Author(s):  
J Lian ◽  
M Sharaf ◽  
F Archie ◽  
S Münstermann
Keyword(s):  
Damage Evolution ◽  
Damage Mechanics ◽  
Hybrid Approach ◽  
High Strength Steels ◽  
High Strength ◽  
Numerical Approach ◽  
Ductile Damage ◽  
Dissipation Energy ◽  
Damage Models ◽  
Steel Sheets

The ductile damage mechanisms dominating in modern high-strength steels have emphasised the significance of the onset of damage and the subsequent damage evolution in sheet metal forming processes. This paper contributes to the modelling of the plasticity and ductile damage behaviour of a dual-phase steel sheet by proposing a new damage mechanics approach derived from the combination of different types of damage models. It addresses the influence of stress state on the plasticity behaviour and onset of damage of materials, and quantifies the microstructure degradation using a dissipation-energy-based damage evolution law. The model is implemented into ABAQUS/Explicit by means of a user material subroutine (VUMAT) and applied to the subsequent numerical simulations. A hybrid experimental and numerical approach is employed to calibrate the material parameters, and the detailed program is demonstrated. The calibrated parameters and the model are then verified by experiments at different levels, and a good agreement between the experimental and numerical results is achieved.

Numerical Prediction of Forming Limit in Hemispherical Punch Bulging by Lemaitre's Ductile Damage Model

2011 ◽  
Vol 110-116 ◽  
pp. 1437-1441 ◽  
Author(s):  
Farhad Haji Aboutalebi ◽  
Mehdi Nasresfahani
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Damage Mechanics ◽  
Thin Sheet ◽  
Damage Model ◽  
Ductile Damage ◽  
Forming Limit ◽  
St14 Steel ◽  
Hemispherical Punch

Prediction of sheet metal forming limits or analysis of forming failures is a very sensitive problem for design engineers of sheet forming industries. In this paper, first, damage behaviour of St14 steel (DIN 1623) is studied in order to be used in complex forming conditions with the goal of reducing the number of costly trials. Mechanical properties and Lemaitre's ductile damage parameters of the material are determined by using standard tensile and Vickers micro-hardness tests. A fully coupled elastic-plastic-damage model is developed and implemented into an explicit code. Using this model, damage propagation and crack initiation, and ductile fracture behaviour of hemispherical punch bulging process are predicted. The model can quickly predict both deformation and damage behaviour of the part because of using plane stress algorithm, which is valid for thin sheet metals. Experiments are also carried out to validate the results. Comparison of the numerical and experimental results shows good adaptation. Hence, it is concluded that finite element analysis in conjunction with continuum damage mechanics can be used as a reliable tool to predict ductile damage and forming limit in sheet metal forming processes.

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