Identification of optimized constitutive model parameters at a high strain rate using electromagnetic ring expansion test results

2011 ◽  
Vol 225 (4) ◽  
pp. 781-789 ◽  
Author(s):  
M Sedighi ◽  
M Khandaei ◽  
H Shokrollahi
Keyword(s):  
Experimental Data ◽  
Constitutive Model ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Optimization Procedure ◽  
Ring Expansion ◽  
Model Parameters ◽  
Test Results ◽  
Expansion Test

In this article, parameters of the material constitutive model have been identified at high strain rate electromagnetic ring expansion test using experimental data taken from literature for oxygen-free electronic copper (OFE Cu). The experimental data were processed using a finite-element optimization procedure in which the measured deformation has been applied to a specimen. An optimal set of material constants for JohnsonCook constitutive model have been computed by minimizing the standard deviation of differences between experimental and calculated stressstrain curves. The applicability of identified parameters has been validated successfully by using simulation of reverse Taylor impact test results. The presented method in this article was found to be an effective method for identifying the material model parameters at high strain rates.

scholarly journals Suitability of the electromagnetic ring expansion test to characterize materials under high strain rate deformation

2016 ◽  
Vol 80 ◽  
pp. 15002
Author(s):  
Kang Yang ◽  
Geoffrey Taber ◽  
Thaneshan Sapanathan ◽  
Anupam Vivek ◽  
Glenn S Daehn ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Ring Expansion ◽  
Expansion Test ◽  
High Strain Rate Deformation

Experimental and Numerical Study of Soft Tissue Surrogate Behavior Under Ballistic Loading

2012 ◽  
Author(s):  
Ericka K. Amborn ◽  
Karim H. Muci-Küchler ◽  
Brandon J. Hinz
Keyword(s):  
Soft Tissue ◽  
Constitutive Model ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Numerical Study ◽  
Constitutive Models ◽  
Material Behavior ◽  
Good Representation

Studying the high strain rate behavior of soft tissues and soft tissue surrogates is of interest to improve the understanding of injury mechanisms during blast and impact events. Tests such as the split Hopkinson pressure bar have been successfully used to characterize material behavior at high strain rates under simple loading conditions. However, experiments involving more complex stress states are needed for the validation of constitutive models and numerical simulation techniques for fast transient events. In particular, for the case of ballistic injuries, controlled tests that can better reflect the effects induced by a penetrating projectile are of interest. This paper presents an experiment that tries to achieve that goal. The experimental setup involves a cylindrical test sample made of a translucent soft tissue surrogate that has a small pre-made cylindrical channel along its axis. A small caliber projectile is fired through the pre-made channel at representative speeds using an air rifle. High speed video is used in conjunction with specialized software to generate data for model validation. A Lagrangian Finite Element Method (FEM) model was prepared in ABAQUS/Explicit to simulate the experiments. Different hyperelastic constitutive models were explored to represent the behavior of the soft tissue surrogate and the required material properties were obtained from high strain rate test data reported in the open literature. The simulation results corresponding to each constitutive model considered were qualitatively compared against the experimental data for a single projectile speed. The constitutive model that provided the closest match was then used to perform an additional simulation at a different projectile velocity and quantitative comparisons between numerical and experimental results were made. The comparisons showed that the Marlow hyperelastic model available in ABAQUS/Explicit was able to produce a good representation of the soft tissue surrogate behavior observed experimentally at the two projectile speeds considered.

Experimental and Modelling of Constitutive Equation of Polycarbonate Material

2015 ◽  
Vol 667 ◽  
pp. 286-291
Author(s):  
Hai Tao Liu ◽  
Neng Chen ◽  
Ya Zhou Sun
Keyword(s):  
Constitutive Model ◽  
High Strain Rate ◽  
Strain Rate ◽  
Ant Colony Algorithm ◽  
High Strain ◽  
Dimensional Structure ◽  
Comparative Results ◽  
Coefficient Of Viscosity ◽  
Viscoelastic Constitutive Model ◽  
Low Strain Rate

In this paper, according to the principle of building the constitutive model of polymer material, the one-dimensional structure of the ZWT material constitutive model is added to dashpot element in parallel, and in which strain rate and coefficient of viscosity is introduced and the nonlinear viscoelastic constitutive model of Polycarbonate material is achieved. Additionally, tensile test at low strain rate and Hopkinson test at high strain rate of polycarbonate material are carried out, and the change rule of yield strength of polycarbonate material is obtained both at high strain rate and low strain rate. According to the experimental data, the parameters of the constitutive model have been optimized and fitted using ant colony algorithm, and then the fitted results are compared with experimental results. The comparative results show that the improved ZWT constitutive model can reasonably represent the nonlinear characteristics of polycarbonate material at different strain rate.

Dynamic behavior and a modified Johnson–Cook constitutive model of Inconel 718 at high strain rate and elevated temperature

2013 ◽  
Vol 580 ◽  
pp. 385-390 ◽  
Author(s):  
Xiangyu Wang ◽  
Chuanzhen Huang ◽  
Bin Zou ◽  
Hanlian Liu ◽  
Hongtao Zhu ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Constitutive Model ◽  
High Strain Rate ◽  
Strain Rate ◽  
Dynamic Behavior ◽  
Inconel 718 ◽  
High Strain

Evaluation of Bodner-Partom Model Parameters at High Strain Rate

1986 ◽  
Vol 108 (1) ◽  
pp. 75-80 ◽  
Author(s):  
A. M. Rajendran ◽  
S. J. Bless ◽  
D. S. Dawicke
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Material Behavior ◽  
Model Parameters ◽  
Plate Impact ◽  
Plane Plate ◽  
Wide Range ◽  
Split Hopkinson ◽  
Stress States

The objective of this paper is to model the high strain rate material behavior of metals using Bodner-Partom visco-plastic constitutive model. A unique algorithm has been developed to evaluate the model parameters from the split Hopkinson Bar and plane plate impact tests data. The model parameters were successfully determined for the 6061-T6 aluminum, 1020 steel, and HY 100 steel. Using the evaluated model parameters, the test data obtained from an unusually wide range of stress states for these three metals were successfully modeled.

scholarly journals Intermediate Strain Rate Testing Devices

2020 ◽  
Author(s):  
Trunal Bhujangrao
Keyword(s):  
Experimental Data ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Full Range ◽  
Strain Rates ◽  
Intermediate Strain Rate ◽  
Wide Range ◽  
Rate Testing ◽  
Rate Test

The existing experimental tests are mainly designed to study the mechanical response of materials at various strain rates. Many researchers performed the experimental test in tension, compression, and shear (with torsion test) over a wide range of strain rates. They found out that material exhibits an increase in yield stress as well as flows stress with an increase in strain rate. It illustrates that there is a need for experimental data to study the material behaviour over the full range of strain rates, from quasi-static to high strain rate test. Many special techniques have been developed to bridge the strain rate gap between quasi-static and high strain rate testing to provide a method for an intermediate strain rate test for engineering materials. Some researchers have tried to conduct intermediate strain rate tests with standard servo-hydraulic load frames. However, the results of such tests are not accurate. The problem is that during the experiment, the whole machine is not in static equilibrium. The inertial effect influences the experimental data. The records obtained from these machines are often noisy with large oscillation. therefore, the comprehensive review is given to describes the development and evolution of the existing intermediate strain rate testing devices which includes the working principles, some critical theories, technological innovation in load measurement techniques, components of the device, basic technical assumption, and measuring techniques. In addition, some research direction on future implementation and development of an intermediate strain rate apparatus is also discussed in detail.

Sign in / Sign up

Export Citation Format

Share Document