scholarly journals On constitutive models of oxygen-free high-conductivity copper at high pressure and high strain rates

2009 ◽  
Vol 58 (4) ◽  
pp. 2612
Author(s):  
Chen Da-Nian ◽  
Fan Chun-Lei ◽  
Hu Jin-Wei ◽  
Tan Hua ◽  
Wang Huan-Ran ◽  
...  
Keyword(s):  
High Pressure ◽  
High Strain ◽  
Constitutive Models ◽  
High Conductivity ◽  
Strain Rates ◽  
High Strain Rates

Evolution of Anand Parameters With Elevated Temperature Aging for SAC Leadfree Alloys

2020 ◽  
Author(s):  
Pradeep Lall ◽  
Vikas Yadav ◽  
Jeff Suhling ◽  
David Locker
Keyword(s):  
Experimental Data ◽  
High Strain ◽  
Constitutive Models ◽  
Tensile Tests ◽  
Model Parameters ◽  
Strain Rates ◽  
Automotive Electronics ◽  
High Strain Rates ◽  
Operating Temperatures ◽  
Electronic Assemblies

Abstract Electronic equipment in automotive, agricultural and avionics applications may be subjected to temperatures in the range of −55 to 200°C during storage, operation and handling in addition to high strain-rates. Strain rates in owing to vibration and shock may range from 1–100 per sec. Temperature in electronic assemblies depends typically on location, energy dissipation and thermal architecture. Some investigators have indicated that the required operating temperature is between −40 to 200°C for automotive electronics located underhood, on engine, on transmission. Prior data indicates the evolution of mechanical properties under extended exposures to high temperatures. However, the constitutive models are often only available for pristine materials only. In this paper, effect of low operating temperatures (−65°C to 0°C) on Anand-model parameters at high strain rates (10–75 per sec) for aged SAC (SAC105 and SAC-Q) solder alloys has been studied. Stress-Strain curves have been obtained at low operating temperatures using tensile tests. The SAC leadfree solder samples were subjected to isothermal-aged up to 4-months at 50°C before testing. Anand Viscoplastic model has been used to describe the material constitutive behavior. Evolution of Anand Model parameters for SAC solder has been investigated. The computed parameters of the experimental data were used to simulate the tensile test and verified the accuracy of the model. A good correlation was found between experimental data and Anand predicted data.

Influence of Temperature and Strain Rate on the Mechanical Behaviour of Aluminium Alloy AA6060

2014 ◽  
Vol 794-796 ◽  
pp. 520-525
Author(s):  
Vincent Vilamosa ◽  
Arild H. Clausen ◽  
Odd Sture Hopperstad ◽  
Tore Børvik ◽  
Svein Skjervold
Keyword(s):  
Strain Rate ◽  
High Speed ◽  
High Strain ◽  
True Strain ◽  
Constitutive Models ◽  
Local Deformation ◽  
Minor Effect ◽  
Strain Rates ◽  
High Strain Rates ◽  
A Minor

In an attempt to improve the constitutive models for 6xxx aluminium alloys at high temperatures and high strain rates, a comprehensive test series has been carried out for AA6060. Uniaxial tension tests were performed at various strain rates from 0.01 s-1to 1000 s-1and temperatures from 20 °C to 350 °C. The tests were carried out using a standard tensile machine for low to moderate strain rates and a split-Hopkinson tension bar (SHTB) system for high strain rates. In both cases, an induction apparatus was used to heat the sample while local deformation measurements were obtained with a high-speed camera and used to estimate the true strain beyond necking. Strong coupling between the influence of strain rate and temperature on the stress-strain behaviour was found. At room temperature, the strain rate has a minor effect on the behaviour of AA6060. On the other hand, a significant increase of the yield stress and work-hardening with strain-rate is observed for temperatures above (K), being the melting temperature; i.e., above 673 K.

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.

Constitutive Modeling of Sea Ice

1987 ◽  
Vol 109 (2) ◽  
pp. 200-205
Author(s):  
V. Chen ◽  
E. S. Chen ◽  
V. Vivatrat
Keyword(s):  
Constitutive Modeling ◽  
High Strain ◽  
Constitutive Models ◽  
Strain Rates ◽  
Rate Dependency ◽  
High Strain Rates ◽  
Reliable Prediction ◽  
Softening Behavior ◽  
Analytical Work ◽  
Ice Loads

Realistic constitutive models for ice are necessary for reliable prediction of ice loads and ice-structure interaction. Previous analytical work has tended to concentrate on ice behavior at low strain rates. Under high strain rates, the post peak softening behavior becomes more important than rate-dependency. This paper proposes a new constitutive model for ice under high strain rates, incorporating strain softening and pressure sensitivity. In its present form, the model is incrementally linear and can be easily implemented in a finite element computer program to solve monotonic loading problems.

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