Effect of mechanical and fractographic properties on hole expandability of various automobile steels during hole expansion test

2009 ◽  
Vol 47 (1-4) ◽  
pp. 365-380 ◽  
Author(s):  
R. Narayanasamy ◽  
C. Sathiya Narayanan ◽  
Palani Padmanabhan ◽  
T. Venugopalan
Keyword(s):  
Hole Expansion ◽  
Expansion Test ◽  
Hole Expansion Test

Anisotropic Plastic Behavior of TRIP 780 Steel Sheet in Hole Expansion Test

2012 ◽  
Vol 504-506 ◽  
pp. 89-94 ◽  
Author(s):  
Sansot Panich ◽  
Vitoon Uthaisangsuk ◽  
Surasak Suranuntchai ◽  
Suwat Jirathearanat
Keyword(s):  
Steel Sheet ◽  
Flow Behavior ◽  
Plastic Anisotropy ◽  
Yield Potential ◽  
Uniaxial Tensile ◽  
Plastic Behavior ◽  
Biaxial Test ◽  
Hole Expansion ◽  
Expansion Test ◽  
Hole Expansion Test

Plastic behavior of advanced high strength steel sheet of grade TRIP780 (Transformation Induced Plasticity) was investigated using three different yield functions, namely, the von Mises’s isotropic, Hill’s anisotropic (Hill’48), and Barlat’s anisotropic (Yld2000-2d) criterion. Uniaxial tensile and balanced biaxial test were conducted for the examined steel in order to characterize flow behavior and plastic anisotropy in different stress states. Additionally, disk compression test was performed for obtaining the balanced r-value. According to the different yield criteria, yield stresses and r-values were calculated for different directions and then compared with experimental data. To verify the modeling accuracy, a hole expansion test was carried out experimentally and numerically by FE simulation. Stress-strain curve from the biaxial test was described using voce and swift hardening models. Punch load and stroke, final hole radius, and strain distribution on specimen surface along the hole circumference and the specimen diameter in rolling and transverse directions were determined and compared with the experimental results. It was found that the simulations applying Yld2000-2d yield function provided an acceptable agreement. Consequently, it is noted that the anisotropic yield potential significantly affects the accuracy of the predicted deformation behavior of sheet metal subjected to hole expanding load.

Image Processing Algorithm for Real-Time Crack Inspection in Hole Expansion Test

2019 ◽  
Vol 20 (7) ◽  
pp. 1139-1148 ◽  
Author(s):  
Seungho Choi ◽  
Kwangyoon Kim ◽  
Jaeho Lee ◽  
Sung Hyuk Park ◽  
Hye-Jin Lee ◽  
...  
Keyword(s):  
Image Processing ◽  
Real Time ◽  
Processing Algorithm ◽  
Image Processing Algorithm ◽  
Hole Expansion ◽  
Expansion Test ◽  
Hole Expansion Test

A Numerical Investigation of the Hole Expansion Test

2012 ◽  
Vol 14 (1) ◽  
pp. 218-221
Author(s):  
Ji Hoon Kim ◽  
M. G. Lee ◽  
Hyo-Dong Shin ◽  
Daeyong Kim
Keyword(s):  
Numerical Investigation ◽  
Hole Expansion ◽  
Expansion Test ◽  
Hole Expansion Test

Hole expansion test of third generation steels

2017 ◽  
Author(s):  
Julen Agirre ◽  
Joseba Mendiguren ◽  
Lander Galdos ◽  
Eneko Sáenz de Argandoña
Keyword(s):  
Third Generation ◽  
Hole Expansion ◽  
Expansion Test ◽  
Hole Expansion Test

scholarly journals Study on the influence of the yield surface shape in the hole expansion test

2020 ◽  
Vol 967 ◽  
pp. 012085
Author(s):  
M C Oliveira ◽  
D M Neto ◽  
J L Alves ◽  
LF Menezes
Keyword(s):  
Yield Surface ◽  
Surface Shape ◽  
Hole Expansion ◽  
Expansion Test ◽  
Hole Expansion Test

scholarly journals Impact of machining-induced surface defects on the edge formability of commercially pure titanium sheet at room temperature

2020 ◽  
Vol 2 (12) ◽  
Author(s):  
J. S. Kwame ◽  
E. Yakushina ◽  
P. Blackwell
Keyword(s):  
Room Temperature ◽  
Surface Defects ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Hole Expansion ◽  
Expansion Test ◽  
Hole Expansion Test ◽  
Edge Surface ◽  
Cp Ti ◽  
The Impact

AbstractDespite the good properties of titanium, which have drawn the interest of various industries over the years, one of the major drawbacks of this material is its poor machinability. This has largely been attributed to its low thermal conductivity and elastic modulus. The ability to attain the optimum sheet edge performance during forming is dependent on the quality of the edges produced. Also, the demanding nature of aerospace part design has provoked the interest of both industry and academia to continually explore avenues tailored at enhancing part performance. The sort of edge surface integrity produced for aerospace part fabrication thus becomes a vital consideration in the quest to ensuring prime performance of components. This work seeks to study the influence of different machining-induced surface defects on the sheet edge performance of CP-Ti (grade 2) at room temperature. Hole expansion test was used to assess the edge surface formability of CP-Ti with different machining-induced edge defects. The research found that machining-induced surface defects act as stress concentration sites during the hole expansion test and have a major impact on the material flow. Electro-discharge machined edges were observed to exhibit high edge formability compared to laser and abrasive water jet cut edges due to the impact of machining-induced microstructural changes.

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