FEM on Constitutive Equation of High Strength Stress Steel GCr15

2012 ◽  
Vol 500 ◽  
pp. 569-573
Author(s):  
Xian Li Liu ◽  
Cai Xu Yue ◽  
Ming Ming Yu ◽  
Jia Yi Zhang ◽  
Ming Yang Wu
Keyword(s):  
Constitutive Equation ◽  
Constitutive Model ◽  
High Strength Steel ◽  
High Speed ◽  
Physical Property ◽  
High Strength ◽  
Model Parameters ◽  
Workpiece Material ◽  
High Speed Cutting ◽  
Influence Of Temperature On

Accuracy of cutting simulation model mostly depends on whether its material constitutive equation describes workpiece physical property under cutting state. It is necessary to research on the constitutive properties of cutting material in the high strain state of temperature. In this paper high strength steel GCr15 is used as a research object under the high speed cutting state. By FEM Johnson-cook constitutive model in Hopkinson Experiment is simulated, and the sensitivity of constant on constitutive model is also analyzed. Also influence of temperature on workpiece material stress and strain is revealed. The result provides reference for Johnson-cook model parameters of high strength steel GCr15, and it provides theory basis of material properties analysis in cutting state as well.

scholarly journals On the Development of Material Constitutive Model for 45CrNiMoVA Ultra-High-Strength Steel

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 374 ◽  
Author(s):  
Xin Hu ◽  
Lijing Xie ◽  
Feinong Gao ◽  
Junfeng Xiang
Keyword(s):  
Constitutive Model ◽  
Strain Rate ◽  
High Strength Steel ◽  
Split Hopkinson Pressure Bar ◽  
High Strength ◽  
Model Parameters ◽  
Hopkinson Pressure Bar ◽  
Simulation Accuracy ◽  
Ultra High Strength Steel ◽  
Split Hopkinson

For the implementation of simulations for large plastic deformation processes such as cutting and impact, the development of the constitutive models for describing accurately the dynamic plasticity and damage behaviors of materials plays a crucial role in the improvement of simulation accuracy. This paper focuses on the dynamic behaviors of 45CrNiMoVA ultra-high-strength torsion bar steel. According to investigation of the Split-Hopkinson pressure bar (SHPB) and Split-Hopkinson tensile bar (SHTB) tests at different strain rate and different temperatures, 45CrNiMoVA ultra-high-strength steel is characterized by strain hardening, strain-rate hardening and thermal softening effects. Based on the analysis on the mechanism of the experimental results and the limitation of classic Johnson-Cook (J-C) constitutive model, a modified J-C model by considering the phase transition at high temperature is established. The multi-objective optimization fitting method was used for fitting model parameters. Compared with the classic J-C constitutive model, the fitting accuracy of the modified J-C model significantly improved. In addition, finite element simulations for SHPB and SHTB based on the modified J-C model are conducted. The SHPB stress-strain curves and the fracture morphology of SHTB samples from simulations are in good agreement with those from tests.

Study on the hybrid laser-arc welding of 3 mm thick high-strength steel with high speed

2018 ◽  
Vol 6 (2) ◽  
pp. 026546 ◽  
Author(s):  
Zhang Peilei ◽  
Gu Siyuan ◽  
Liu Zhengjun ◽  
Yu Zhishui
Keyword(s):  
High Strength Steel ◽  
Arc Welding ◽  
High Speed ◽  
High Strength ◽  
Hybrid Laser Arc Welding

Wear mechanisms of coated tools in high-speed hard turning of high strength steel

2017 ◽  
Vol 94 (9-12) ◽  
pp. 4553-4563 ◽  
Author(s):  
Guangming Zheng ◽  
Li Li ◽  
Zhiyong Li ◽  
Jun Gao ◽  
Zongwei Niu
Keyword(s):  
Wear Mechanisms ◽  
High Strength Steel ◽  
High Speed ◽  
Hard Turning ◽  
High Strength ◽  
Coated Tools

Lap Joint Properties of FSBRed Dissimilar Metals AZ31 Mg Alloy and DP600 High-Strength Steel with Various Parameters

2011 ◽  
Vol 228-229 ◽  
pp. 427-432 ◽  
Author(s):  
Chang Qing Zhang ◽  
Bo Qiang Li ◽  
Xi Jing Wang
Keyword(s):  
Shear Strength ◽  
High Strength Steel ◽  
High Strength ◽  
Frictional Heat ◽  
Lap Joint ◽  
Workpiece Material ◽  
High Rotational Speed ◽  
Friction Stir ◽  
Az31 Mg Alloy ◽  
Joint Properties

The Friction stir blind riveting (FSBR) process consists of a blind rivet is driven at high rotational speed and brought into contact with the workpieces, thereby generating frictional heat between the rivet and the workpiece, which softens the workpiece material and enables the rivet to be driven into the workpieces under reduced force. The riveting of lap joint of AZ31B(3mm) magnesium alloys plate and a DP600 (1mm) high strength steel plate was produced by FSBR using 2200rpm rotation speed, various feet rates and different lap mode to investigate the effects of the joint morphology and strength. The joint strength depended strongly on the shank of rivet itself shear strength，however in which case the strength of joint impacted by rivet assembly quality (the lap of plates, the tightness rivet of workpiece). So positioning the steel sheet on the top is desirable, the maximum shear strength of the joint reached about 6.0KN.

Investigation for High Speed Ultrasonic Cutting of Aluminum Alloy

2012 ◽  
Vol 516 ◽  
pp. 367-372 ◽  
Author(s):  
Keisuke Hara ◽  
Hiromi Isobe ◽  
Yoshihiro Take ◽  
Toshihiko Koiwa
Keyword(s):  
High Speed ◽  
Cutting Speed ◽  
Cutting Conditions ◽  
Ultrasonic Oscillation ◽  
Workpiece Material ◽  
Machined Surface ◽  
High Speed Cutting ◽  
Cemented Carbide Tool ◽  
Cutting Operation ◽  
Ultrasonic Cutting

This study investigated phenomena of ultrasonic cutting in the case of high-speed conditions. Ultrasonically assisted cutting techniques were developed by Kumabe in the 1950s. He found a critical cutting speed that limits cutting speed to obtain ultrasonically assisted effects and is calculated by frequency and amplitude of oscillation. In general, ultrasonically assisted cutting is not suitable for high-speed cutting conditions because the effects of ultrasonic application are cancelled due to tool contacts with the workpiece during the cutting operation. Present ultrasonically assisted cutting cannot allow increased cutting speed because cutting speed is limited by a critical cutting speed that is less than that compared with general cutting speed. And ultrasonically assisted cutting cannot improve productivity due to long processing time. We conducted high-speed ultrasonic cutting, and the maximum cutting speed in this research was 300 m/min which is higher than general critical cutting speed. The workpiece material was A5056 and cemented carbide tool inserts were employed in this research. Without ultrasonic oscillation, machined surface retained some built up edge and surface roughness is 28 μmRz. In the case of ultrasonic cutting, surface hasnt built up edge and periodically marks due to ultrasonic oscillation remained on the surface. The roughness of conventionally cut surface is better than in ultrasonic cutting. The cutting phenomena of ultrasonic cutting are different compared with those under conventional cutting conditions.

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