Strain rate dependent constitutive model for predicting the material behaviour of polyurea under high strain rate tensile loading

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.

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ANN constitutive model for high strain-rate deformation of Al 7075-T6

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2006.11.228 ◽

2007 ◽

Vol 186 (1-3) ◽

pp. 339-345 ◽

Cited By ~ 29

Author(s):

Jamal Sheikh-Ahmad ◽

Janet Twomey

Keyword(s):

Constitutive Model ◽

High Strain Rate ◽

Strain Rate ◽

High Strain ◽

High Strain Rate Deformation ◽

Al 7075

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Experimental and Modelling of Constitutive Equation of Polycarbonate Material

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.667.286 ◽

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.

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Dynamic Deformation of Frozen Soil at a High Strain Rate: Experiments and Damage-Coupled Constitutive Model

Acta Mechanica Solida Sinica ◽

10.1007/s10338-021-00273-5 ◽

2021 ◽

Author(s):

Z. W. Zhu ◽

W. R. Tang ◽

G. Z. Kang

Keyword(s):

Constitutive Model ◽

High Strain Rate ◽

Strain Rate ◽

High Strain ◽

Dynamic Deformation ◽

Frozen Soil

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Response and failure of fiber metal laminates subjected to high strain rate tensile loading

Journal of Composite Materials ◽

10.1177/0021998318804620 ◽

2018 ◽

Vol 53 (11) ◽

pp. 1489-1506 ◽

Cited By ~ 3

Author(s):

Ankush P Sharma ◽

Sanan H Khan ◽

Venkitanarayanan Parameswaran

Keyword(s):

High Strain Rate ◽

Strain Rate ◽

Glass Fiber ◽

High Speed ◽

High Strain ◽

Image Correlation ◽

Fiber Metal Laminates ◽

Rate Dependent ◽

Dependent Behavior ◽

Fiber Metal

The tensile behavior of fiber metal laminates consisting of layers of aluminum 2024-T3 alloy and glass fiber reinforced composites under high strain rate loading is investigated. Fiber metal laminates having four different layups, but all having the same total metal layer thickness, were fabricated using a combined hand lay-up cum vacuum bagging method. The fiber metal laminate specimens were loaded in high strain rate tension using a split Hopkinson tensile bar. The rate-dependent behavior of the glass fiber composite was also obtained as baseline data. The strain on the gage area of the specimen was measured directly using high-speed digital image correlation. Another high-speed camera was used to capture the sequence of damage by viewing the specimen edgewise. The results indicated that the strength of the fiber metal laminates increased at high strain rates primarily due to the rate-dependent behavior of the composite used. The response was also influenced by the distribution of the metallic layers in the fiber metal laminates. The failure in the case where the individual composite layers were separated by metallic layers was more progressive in nature.

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Static and Impact-Dynamic Characterization of Multiphase TRIP Steels

Materials Science Forum ◽

10.4028/www.scientific.net/msf.638-642.3585 ◽

2010 ◽

Vol 638-642 ◽

pp. 3585-3590 ◽

Cited By ~ 2

Author(s):

Joost Van Slycken ◽

Jérémie Bouquerel ◽

Patricia Verleysen ◽

Kim Verbeken ◽

Joris Degrieck ◽

...

Keyword(s):

High Strain Rate ◽

Strain Rate ◽

High Strain ◽

Material Behavior ◽

Experimental Program ◽

Dynamic Conditions ◽

Split Hopkinson Tensile Bar ◽

Rate Dependent ◽

Study Results ◽

Steel Grades

In this study, results are presented of an extensive experimental program to investigate the strain rate dependent mechanical properties of various Transformation Induced Plasticity (TRIP) steel grades. A split Hopkinson tensile bar setup was used for the high strain rate experiments and microstructural observation techniques such as LOM, SEM and EBSD revealed the mechanisms governing the observed behavior. With elevated testing temperatures and interrupted tensile experiments the material behavior and the austenite to martensite transformation is investigated. In dynamic conditions, the strain rate has limited influence on the material properties. Yet an important increase is noticed when comparing static to dynamic conditions. The differences in strength, elongation and energy absorption levels observed between the investigated materials can be attributed to their chemical composition. Adiabatic heating during high strain rate deformation tends to slow down the strain induced martensitic deformation. The elongation of the ferritic and austenite constituents is found to be strain rate dependent and the strain induced martensitic transformation occurs gradually in the material.

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