A Modified Johnson-Cook Model for Hot Deformation Behavior of 35CrMo Steel

Wang, Sanxing; Huang, Yuanchun; Xiao, Zhengbing; Liu, Yu; Liu, Hui

doi:10.3390/met7090337

Cited by 21 publications

(7 citation statements)

References 45 publications

(42 reference statements)

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“…In this study, Johnson Cook material model equation parameters are defined as material model and Eq. 1gives material model parameters [12]. (1) where σ denotes the stress, is the plastic deformation, A is the yield strength, B is the hardening parameter, n is the hardening exponent, and T m is the temperature effect.…”

Section: Finite Element Modellingmentioning

confidence: 99%

Agricultural Tractor Cabin Safety Analysis and Test Correlation

Karakulak¹,

Yetkin²

2020

International Journal of Automotive Science and Technology

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Tractors are important vehicles for agricultural fields and they are widely used. Even if they do not be in the traffic due to their intended use, safety of the driver is important if the tractor is rollover. In tractor, the impact energy is provided by cabin or protective profile structure during rollover. Safety test conditions have been established by Organization for Economic Cooperation and Development (OECD) by determining the loads that may occur in case of rollover. According to the standard which developed by OECD, the effects of the energy to be generated during rollover or impact on the structure are examined by performing tests under the specified loads. In this study, static loading test of tractor cabins is simulated by finite element method according to the ISO 3471 standart. Tractor cabin finite element models have been prepared with HyperMesh and HyperCrash software. Nonlinear explicit analysis of the model was performed under the loads applied during the test.. The analysis were carried out using RADIOSS software, based on the operating principle of the load carrying mechanism in order to simulate the test loads. The finite element model is limited to the frame connection points and the deformations are examined for three loading conditions. According to the results which are obtained from the test, the finite element analysis of the designed cabin was also validated.

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Section: Finite Element Modellingmentioning

confidence: 99%

Agricultural Tractor Cabin Safety Analysis and Test Correlation

Karakulak¹,

Yetkin²

2020

International Journal of Automotive Science and Technology

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“…During thermal processing, different thermal deformation parameters have significant effects on the microstructure and properties of the material [5,6]. Numerous studies have been done into the evolution of the microstructure during thermal deformation in recent years [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hot Deformation Process Parameters on Microstructure and Corrosion Behavior of 35CrMoV Steel

Yang

Zhou

et al. 2019

Materials

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Hot deformation experiments of as-cast 35CrMoV steel, with strain rates of 0.01 s−1 and 10 s−1, deformation temperatures of 850, 950, and 1050 °C, and an extreme deformation reaching 50%, were carried out using a Gleeble-3810 thermal simulator. Electrochemical corrosion experiments were conducted on the deformed specimens. The microstructure was observed by optical microscope (OM), and the corrosion morphology and corrosion products of the specimens were investigated by scanning electron microscopy (SEM), energy disperse spectroscopy (EDS), confocal laser scanning microscopy (CLSM), and X-ray diffraction (XRD) techniques. The results show that the grain size increased gradually with an increase in the deformation temperature at the same strain rate, whereas the corrosion resistance deteriorated. At the same deformation temperature, the grain size becomes smaller as the strain rate increases, which enhances the corrosion resistance. This is mainly attributed to the fine grains, which can form more grain boundaries, increase the grain boundary area, and accelerate the formation of the inner rust layer at the beginning of corrosion. Moreover, fine grains can also refine the rust particles and enhance the bonding strength between the inner rust layer and the matrix. The denseness and stability of the inner rust layer increases as the corrosion process progresses, thereby improving corrosion resistance.

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“…Generally, constitutive models are of great importance for the analysis of hot deformation behaviors. There are three categories of constitutive models, among which the phenomenological 2 of 13 models are the most widely used, due to fewer material parameters compared to the physical-based ones [10,11]. The strain-compensated Arrhenius model was found to provide more precise descriptions on the flow stress at evaluated temperatures [12,13].…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of a 2024 Aluminum Alloy Sheet and its Modeling by Fields-Backofen Model Considering Strain Rate Evolution

Zhang

Wang

Lin

et al. 2019

Metals

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The deformation behavior of a 2024 aluminum alloy sheet at elevated temperatures was studied by uniaxial hot tensile tests over the nominal initial strain rate range of 0.001–0.1 s−1 and temperature range of 375–450 °C. In order to analyze the deformation behavior with higher accuracy, a digital image correlation (DIC) system was applied to determine the strain distribution during hot tensile tests. Local stress-strain curves for different local points on the specimens were calculated. The strain rate evolution of each point during the tensile tests was investigated under different deformation conditions. Then, an improved Fields–Backofen (FB) model, taking into account the local strain rate evolution instead of the fixed strain rate, was proposed to describe the constitutive behaviors. It has been found that obvious non-uniform strain distribution occurred when the true strain was larger than 0.3 during hot tensile tests. The strain rate distribution during deformation was also non-uniform. It showed increasing, steady, and decreasing variation tendencies for different points with the increasing of strain, which led to the local flow stress being different at different local points. The flow stresses predicted by the improved FB model showed good agreement with experimental results when the strain rate evolutions of local points during tensile tests were considered. The prediction accuracy was higher than that of traditional FB models.

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A Modified Johnson-Cook Model for Hot Deformation Behavior of 35CrMo Steel

Cited by 21 publications

References 45 publications

Agricultural Tractor Cabin Safety Analysis and Test Correlation

Agricultural Tractor Cabin Safety Analysis and Test Correlation

Effect of Hot Deformation Process Parameters on Microstructure and Corrosion Behavior of 35CrMoV Steel

Hot Deformation Behavior of a 2024 Aluminum Alloy Sheet and its Modeling by Fields-Backofen Model Considering Strain Rate Evolution

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