A modified Johnson-Cook model with damage degradation for B4Cp/Al composites

2021 ◽  
pp. 115029
Author(s):  
Z.L. Chao ◽  
L.T. Jiang ◽  
G.Q. Chen ◽  
Qiang. Zhang ◽  
N.B. Zhang ◽  
...  
Keyword(s):  
Cook Model

Modified Johnson-Cook model of aluminum alloy 6016-T6 sheets at low dynamic strain rates

2021 ◽  
pp. 141565
Author(s):  
Zhe Jia ◽  
Ben Guan ◽  
Yong Zang ◽  
Yuan Wang ◽  
Lei Mu
Keyword(s):  
Aluminum Alloy ◽  
Dynamic Strain ◽  
Strain Rates ◽  
Cook Model

Failure Strain and Fracture Prediction During Shock Tube Impact Forming of AA 5052-H32 Sheet

2021 ◽  
pp. 1-39
Author(s):  
Saibal Kanchan Barik ◽  
Ganesh R Narayanan ◽  
Niranjan Sahoo
Keyword(s):  
Finite Element ◽  
Flow Stress ◽  
Shock Tube ◽  
Failure Strain ◽  
Experimental Situation ◽  
Rate Sensitivity ◽  
Fracture Pattern ◽  
Failure Model ◽  
Stress Models ◽  
Cook Model

Abstract The present study deals with both numerical and experimental evaluation of failure strain and fracture pattern during shock tube impact forming of 1.5 mm thick AA 5052-H32 sheet. A hemispherical end nylon striker is propelled to deform the sheet at different velocities. Here the main objective is to understand the effect of flow stress models and fracture models on the forming outputs. The experimental situation is modelled in two stages, i.e., incorporating the pressure in the first stage, and displacement of the striker in the second stage in finite element simulation using the finite element (FE) code (DEFORM-3D). A new strategy followed to evaluate the rate-dependent flow stress data from the tensile test of samples sectioned from shock tube-based deformed sheet is acceptable, and finite element simulations incorporating those properties predicted accurate failure strain and fracture pattern. Out of all the flow stress models, the modified Johnson-Cook model has a better flow stress predictability due to the inclusion of the non-linear strain rate sensitivity term in the model. During the prediction of the failure strain and necking location, Cockcroft-Latham failure model, Brozzo failure model, and Freudenthal failure model have a fair agreement with experimental data in combination with the two flow stress models, i.e., Johnson-Cook model and modified Johnson-Cook model.

Effect of Loading Rate on Tensile Properties of Automotive Steel Sheet

2013 ◽  
Vol 690-693 ◽  
pp. 211-217
Author(s):  
Jin Gui Qin ◽  
Fang Yun Lu ◽  
Yu Liang Lin ◽  
Xue Jun Wen
Keyword(s):  
Strain Rate ◽  
Testing Machine ◽  
Structural Response ◽  
Tensile Tests ◽  
Dynamic Tests ◽  
Static Tests ◽  
Split Hopkinson Tensile Bar ◽  
Axial Tensile ◽  
Static Tensile ◽  
Cook Model

Results of uni-axial tensile loading of three automotive steels at different strain rates (0.0011–3200s-1) are reported here. Quasi-static tensile tests were performed under the strain rate of 1.1×10-3 s-1 using an electromechanical universal testing machine, whereas dynamic tests were carried out under the strain rate in the range of 1100 to 3200 s-1 using a Split Hopkinson Tensile Bar apparatus. Based on the experimental results, the material parameters of widely used Johnson–Cook model which described the strain rate and temperature-dependent of mechanical behaviour were determined. The experiments show that strain-rate hardening is superior to thermal softening: yield stresses, tensile strength, deformation, and energy dissipation increase with the strain rate from quasi-static tests to dynamic tests. The Johnson–Cook model can describe the behaviour of these steels and provides the opportunity to study the material and structural response.

scholarly journals FEM simulation for orthogonal cutting of Titanium-alloy considering ductile fracture to Johnson-Cook model

2016 ◽  
Vol 3 (2) ◽  
pp. 15-00536-15-00536 ◽  
Author(s):  
Makoto NIKAWA ◽  
Hiroki MORI ◽  
Yuki KITAGAWA ◽  
Masato OKADA
Keyword(s):  
Titanium Alloy ◽  
Ductile Fracture ◽  
Orthogonal Cutting ◽  
Fem Simulation ◽  
Cook Model

Constitutive model of 6063 aluminum alloy under the ultrasonic vibration upsetting based on Johnson-Cook model

Ultrasonics ◽  
2019 ◽  
Vol 96 ◽  
pp. 1-9 ◽  
Author(s):  
Zhendong Xie ◽  
Yanjin Guan ◽  
Jun Lin ◽  
Jiqiang Zhai ◽  
Lihua Zhu
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Model ◽  
Ultrasonic Vibration ◽  
6063 Aluminum Alloy ◽  
Cook Model
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