Mechanical and optical characterization of an anelastic polymer at large strain rates and large strains

1974 ◽  
Vol 14 (1) ◽  
pp. 10-18 ◽  
Author(s):  
K. W. Chase ◽  
W. Goldsmith
Keyword(s):  
Large Strain ◽  
Optical Characterization ◽  
Large Strains ◽  
Strain Rates

Dynamic Recrystallization of Zircaloy-4 during Working within the Upper α-Range

2004 ◽  
Vol 467-470 ◽  
pp. 1151-1156 ◽  
Author(s):  
Cédric Chauvy ◽  
Pierre Barbéris ◽  
Frank Montheillet
Keyword(s):  
Dynamic Recrystallization ◽  
Large Strain ◽  
Large Angle ◽  
Rate Sensitivity ◽  
Large Strains ◽  
Strain Rates ◽  
Compression Tests ◽  
Continuous Dynamic Recrystallization ◽  
Ebsd Technique ◽  
Continuous Dynamic

Compression tests were used to simulate simple deformation paths within the upper a-range of Zircaloy-4 (i.e. 500°C-750°C). The mechanical behaviour reveals two different domains : at low temperatures and large strain rates, strain hardening takes place before flow softening, whereas this first stage disappears at lower flow stress levels. Strain rate sensitivity and activation energy were determined for both domains. Dynamic recrystallization was investigated using the Electron BackScattering Diffraction (EBSD) technique. It appears that the mechanism involved here is continuous dynamic recrystallization (CDRX), based on the increasing misorientation of subgrain boundaries and their progressive transformation into large angle boundaries. At low strains (e £ 0.3), CDRX kinetics are similar whatever the deformation conditions, while higher temperatures and lower strain rates promote recrystallization at large strains.

Microcracking, Strain Rate and Large Strain Deformation Effects in Molybdenum Disilicide

1993 ◽  
Vol 322 ◽  
Author(s):  
D. A. Hardwick ◽  
P. L. Martin
Keyword(s):  
High Purity ◽  
Dislocation Substructure ◽  
Large Strain ◽  
Molybdenum Disilicide ◽  
Large Strains ◽  
Strain Rates ◽  
Transmission Microscopy ◽  
Purity Material ◽  
Subgrain Formation ◽  
Microstructural Examination

AbstractHigh purity molybdenum disilicide was deformed in compression to strains ranging from 5 to >50%. The deformation was accomplished at temperatures in the range 1200°-1400°C and at strain rates from 10−3 to 10−5 sec−1. The strength of this high purity material was found to be at least twice that of MoSi2 produced by the hot pressing of commercial powder. Microstructural examination revealed that subgrain formation resulted from modest strains (≈10%) while dynamic recrystallization was observed following large strains. Transmission microscopy revealed a significant change in the dislocation substructure after straining as the temperature was increased from 1300°C to 1400°C.

Characterization of Hardening Behavior at Ultra-High Strain Rate, Large Strain, and High Temperature

2016 ◽  
Vol 725 ◽  
pp. 138-142
Author(s):  
Ming Jun Piao ◽  
Hoon Huh ◽  
Ik Jin Lee
Keyword(s):  
High Temperature ◽  
High Strain ◽  
Large Strain ◽  
Thermal Softening ◽  
Ofhc Copper ◽  
Strain Rates ◽  
High Strain Rates ◽  
Softening Effect ◽  
Wide Range

This paper is concerned with the characterization of the OFHC copper flow stress at strain rates ranging from 10−3 s−1 to 106 s−1 considering the large strain and high temperature effects. Several uniaxial material tests with OFHC copper are performed at a wide range of strain rates from 10−3 s−1 to 103 s−1 by using a INSTRON 5583, a High Speed Material Testing Machine (HSMTM), and a tension split Hopkinson pressure bar. In order to consider the thermal softening effect, tensile tests at 25°C and 200°C are performed at strain rates of 10−3 s−1,101 s−1, and 102 s−1. A modified thermal softening model is considered for the accurate application of the thermal softening effect at high strain rates. The large strain behavior is challenged by using the swift power law model. The high strain rates behavior is fitted with the Lim–Huh model. The hardening curves are evaluated by comparing the final shape of the projectile from numerical simulation results with the Taylor impact tests.

Initial Testing and Constitutive Modeling of Cellular Rubber Subjected to Large Strains and High Strain Rates

2020 ◽  
Author(s):  
James A. Bieler ◽  
Brad G. Davis
Keyword(s):  
High Strain ◽  
Large Strain ◽  
Constitutive Models ◽  
Cementitious Materials ◽  
Large Strains ◽  
Materials Testing ◽  
Elastic Model ◽  
Strain Rates ◽  
High Strain Rates ◽  
Suitable Material

Abstract In order to allow for the numerical modeling of impacts for the design of live fire facilities commonly used by military and law enforcement personnel against next generation and environmentally friendly ammunition currently in development, constitutive models for novel target materials must be developed. Many existing facilities are constructed from AR500 steel, coupled with a layer of cellular rubber to reduce impact velocities and contain projectile fragments. High strain rate models, such as the commonly used Johnson-Cook constitutive model, are widely available to characterize AR500 steel, but calibrated models do not currently exist to characterize the cellular rubber. This project seeks to address this shortfall and provide a suitable material model for designers of these facilities in order to ensure the safety of users and the public. Appropriate constitutive models that account for the large strain, high strain rates, and temperature effects experienced during ballistic events and the porosity of the material were researched and a plan developed for future materials testing. Three suitable models were selected for further analysis — A Non-Linear Elastic Model described by Johnson in his work with polyurethane coupled with a Mie-Gruneisen equation of state to account for the porosity of the material, an Osborn-Hull model developed for use with crushable solids, and the Holmquist-Johnson-Cook Model commonly used for cementitious materials.

Crystal Growth and Electro-optical Characterization of In2Se2.7Sb0.3 Compound

2020 ◽  
Vol 12 (4) ◽  
pp. 04022-1-04022-4
Author(s):  
Piyush Patel ◽  
◽  
S. M. Vyas ◽  
Vimal Patel ◽  
Himanshu Pavagadhi ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Optical Characterization

Optical Characterization of Monodispersed Aaqueous Cu2+-Doped CdS Nanoparticles Prepared Under Microwave Irradiation Conditions

2014 ◽  
Vol 01 (999) ◽  
pp. 1-1
Author(s):  
Wei Zhu ◽  
Qihui Shen ◽  
Xinjian Bao ◽  
Xiao Bai ◽  
Tingting Li ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Optical Characterization ◽  
Cds Nanoparticles

Application of Kubelka-Munk model on the optical characterization of translucent dental zirconia

2021 ◽  
Vol 258 ◽  
pp. 123994
Author(s):  
Luciana M. Schabbach ◽  
Bruno C. dos Santos ◽  
Letícia S. De Bortoli ◽  
Márcio Celso Fredel ◽  
Bruno Henriques
Keyword(s):  
Optical Characterization

Analytical Solutions for Circular Bars Subjected to Large Strain Plastic Torsion

1990 ◽  
Vol 57 (2) ◽  
pp. 298-306 ◽  
Author(s):  
K. W. Neale ◽  
S. C. Shrivastava
Keyword(s):  
Closed Form ◽  
Analytical Solutions ◽  
Large Strain ◽  
Kinematic Hardening ◽  
Flow Theory ◽  
Constitutive Laws ◽  
Isotropic Hardening ◽  
Large Strains ◽  
Inelastic Behavior ◽  
Rate Dependent

The inelastic behavior of solid circular bars twisted to arbitrarily large strains is considered. Various phenomenological constitutive laws currently employed to model finite strain inelastic behavior are shown to lead to closed-form analytical solutions for torsion. These include rate-independent elastic-plastic isotropic hardening J2 flow theory of plasticity, various kinematic hardening models of flow theory, and both hypoelastic and hyperelastic formulations of J2 deformation theory. Certain rate-dependent inelastic laws, including creep and strain-rate sensitivity models, also permit the development of closed-form solutions. The derivation of these solutions is presented as well as numerous applications to a wide variety of time-independent and rate-dependent plastic constitutive laws.

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