Plastic deformation of 1020 steel over a wide range of strain rates and temperatures

1997 ◽  
Vol 13 (6-7) ◽  
pp. 611-632 ◽  
Author(s):  
Amos Gilat ◽  
Xinrong Wu
Keyword(s):  
Plastic Deformation ◽  
Strain Rates ◽  
Wide Range

Comparison between thermal and deformation-induced structural relaxation in atomic glasses

2002 ◽  
Vol 754 ◽  
Author(s):  
Magesh Nandagopal ◽  
Marcel Utz
Keyword(s):  
Plastic Deformation ◽  
Structural Relaxation ◽  
Interatomic Distance ◽  
Thermal Relaxation ◽  
Preliminary Evidence ◽  
Strain Rates ◽  
Intermediate Structure ◽  
Plastic Yielding ◽  
Lennard Jones ◽  
Wide Range

ABSTRACTPlastic yielding in glassy solids has been interpreted as a strain-biased relaxation process, or, equivalently, as a strain-induced glass transition. In the present work, the atomic motions caused by athermal plastic deformation of a binary Lennard-Jones glass are compared to thermal motion in the liquid in terms of the self part of the intermediate structure factor. We find that like at finite temperature, athermal plastic deformation leads to diffusive atomic motion at all length scales beyond about one interatomic distance, effectively promoting structural relaxation. The present approach allows to study the interplay of deformation-induced and thermal relaxation. Preliminary evidence is presented that these two processes occur independently of each other over a wide range of strain rates.

scholarly journals Modelling plastic deformation of metals over a wide range of strain rates using irreversible thermodynamics

2009 ◽  
Vol 3 ◽  
pp. 012006 ◽  
Author(s):  
Mingxin Huang ◽  
Pedro E J Rivera-Díaz-del-Castillo ◽  
Olivier Bouaziz ◽  
Sybrand van der Zwaag
Keyword(s):  
Plastic Deformation ◽  
Irreversible Thermodynamics ◽  
Strain Rates ◽  
Wide Range

Dynamic Mechanical Responses of Ultrafine-Grained IF Steel Over a Wide Range of Temperatures

2018 ◽  
Vol 10 (04) ◽  
pp. 1850044 ◽  
Author(s):  
Jiejian Liu ◽  
Tao Suo ◽  
Yuqing Fan ◽  
Jianguo Li ◽  
Fenghua Zhou ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Temperature Rise ◽  
Shear Localization ◽  
Adiabatic Shear ◽  
Strain Rates ◽  
Interstitial Free ◽  
If Steel ◽  
Ultrafine Grained ◽  
Wide Range

The ultrafine-grained interstitial free (UFG-IF) steel was fabricated using the equal channel angular pressing (ECAP) method. Transmission electronic microscope (TEM) observations showed that the grains were refined to sub-micrometer scale and the average grain size was several hundred nanometers (nm). Uniaxial compression tests were conducted over a wide range of strain rates (up to 6000/s) and temperatures (from −196[Formula: see text]C to 300[Formula: see text]C) to understand the dependence of mechanical behaviors on the strain rate and temperature. It is found that the UFG-IF steel showed a weak strain rate sensitivity and displayed a strong temperature sensitivity only within a very narrow temperature range. Microstructural observations on the specimens deformed dynamically at temperatures below −20[Formula: see text]C via scanning electronic microscopy (SEM) and TEM indicated the occurrence of adiabatic shear localization. In order to explain the reason why adiabatic shear localization formed at the low temperatures and high strain rates, the susceptibility factor to adiabatic shear band (ASB) was estimated. It is proposed that more heat generated during the adiabatic plastic deformation process due to the enhanced flow stress of the UFG-IF steel at lower temperatures may play a dominant role in the formation of ASB. Meanwhile, the experimental results also provide strong evidence that for the UFG-IF steel the dynamic recrystallization which results from the severe plastic deformation and high temperature rise only occurs at the later stage of ASB evolution. With regard to the formation of ASB in the UFG IF steel, the localized plastic flow at a lower stress level indicates that localized deformation happens firstly and the temperature rise in the localized shearing zone leads to the final plastic instability.

scholarly journals Моделирование временных эффектов необратимого деформирования на основе релаксационной модели пластичности

2019 ◽  
Vol 61 (6) ◽  
pp. 1015
Author(s):  
Н.С. Селютина ◽  
Ю.В. Петров
Keyword(s):  
Plastic Deformation ◽  
Yield Strength ◽  
High Strength ◽  
High Rate ◽  
Smooth Transition ◽  
Strain History ◽  
Strain Rates ◽  
Relaxation Model ◽  
Yield Drop ◽  
Wide Range

The analysis of plastic deformation of metals and polymethylmethacrylate under dynamic loading is carried out using a relaxation model of plastic deformation. The invariance of the parameters of the relaxation model of plasticity to the strain history allows us to obtain any set of deformation curves from a united viewpoint, both monotonic, with varying yield strength, and non-monotonic, with emerging and varying yield drop, as it is observed in experiments. The increase of the yield strength of high-strength 2.3Ni-1.3Cr steel together with the hardening effect both under high-rate and slow deformation is also modeled on the basis of the relaxation model. Using DP600 steel and nanocrystalline nickel as an example it is shown that the relaxation model of plasticity allows one to predict a smooth transition to the plastic deformation stage at slow quasi-static effects of ~ 10–3 s – 1, and also the appearance of a yield drop effect at strain rates of 500–6000 s –1. It is also shown that the developed approach allows one to simulate similar effects under high-rate deformation of polymethylmethacrylate. Thus, it was demonstrated using specific materials as an example that it is possible to effectively predict the deformation dependencies of the materials studied in a wide range of strain rates of 10-4-104 s-1 based on the parameters of the relaxation model of irreversible deformations.

scholarly journals Microstructural Characterization and Mechanical Properties of Ti-6Al-4V Alloy Subjected to Dynamic Plastic Deformation Achieved by Multipass Hammer Forging with Different Forging Temperatures

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Xiurong Fang ◽  
Jiang Wu ◽  
Xue Ou ◽  
Fuqiang Yang
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Volume Fraction ◽  
Microstructural Characterization ◽  
Optical Microscope ◽  
Strain Rates ◽  
Materials Properties ◽  
Forging Process ◽  
Hammer Forging ◽  
Dynamic Plastic Deformation

Dynamic plastic deformation (DPD) achieved by multipass hammer forging is one of the most important metal forming operations to create the excellent materials properties. By using the integrated approaches of optical microscope and scanning electron microscope, the forging temperature effects on the multipass hammer forging process and the forged properties of Ti-6Al-4V alloy were evaluated and the forging samples were controlled with a total height reduction of 50% by multipass strikes from 925°C to 1025°C. The results indicate that the forging temperature has a significant effect on morphology and the volume fraction of primary α phase, and the microstructural homogeneity is enhanced after multipass hammer forging. The alloy slip possibility and strain rates could be improved by multipass strikes, but the marginal efficiency decreases with the increased forging temperature. Besides, a forging process with an initial forging temperature a bit above β transformation and finishing the forging a little below the β transformation is suggested to balance the forging deformation resistance and forged mechanical properties.

Free volume based nonlinear viscoelastic model for polyurea over a wide range of strain rates and temperatures

2021 ◽  
Vol 152 ◽  
pp. 103650
Author(s):  
Chencheng Gong ◽  
Yan Chen ◽  
Ting Li ◽  
Zhanli Liu ◽  
Zhuo Zhuang ◽  
...  
Keyword(s):  
Free Volume ◽  
Viscoelastic Model ◽  
Strain Rates ◽  
Nonlinear Viscoelastic ◽  
Wide Range ◽  
Nonlinear Viscoelastic Model
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