PRESSURE-SENSITIVITY AND TENSILE STRENGTH OF AN ELASTOMER AT HIGH STRAIN RATES

2008 ◽  
Author(s):  
T. Jiao ◽  
R. J. Clifton ◽  
S. E. Grunschel ◽  
Mark Elert ◽  
Michael D. Furnish ◽  
...  
Keyword(s):  
Tensile Strength ◽  
High Strain ◽  
Strain Rates ◽  
Pressure Sensitivity ◽  
High Strain Rates

PRESSURE-SENSITIVITY AND CONSTITUTIVE MODELING OF AN ELASTOMER AT HIGH STRAIN RATES

2009 ◽  
Author(s):  
T. Jiao ◽  
R. J. Clifton ◽  
S. E. Grunschel ◽  
Mark Elert ◽  
Michael D. Furnish ◽  
...  
Keyword(s):  
Constitutive Modeling ◽  
High Strain ◽  
Strain Rates ◽  
Pressure Sensitivity ◽  
High Strain Rates

scholarly journals An Image-Based Impact Test for the High Strain Rate Tensile Properties of Brittle Materials

2018 ◽  
Vol 183 ◽  
pp. 02042
Author(s):  
Lloyd Fletcher ◽  
Fabrice Pierron
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
High Strain Rate ◽  
Strain Rate ◽  
Stress Wave ◽  
High Strain ◽  
Brittle Materials ◽  
Test Method ◽  
Strain Rates ◽  
High Strain Rates

Testing ceramics at high strain rates presents many experimental diffsiculties due to the brittle nature of the material being tested. When using a split Hopkinson pressure bar (SHPB) for high strain rate testing, adequate time is required for stress wave effects to dampen out. For brittle materials, with small strains to failure, it is difficult to satisfy this constraint. Because of this limitation, there are minimal data (if any) available on the stiffness and tensile strength of ceramics at high strain rates. Recently, a new image-based inertial impact (IBII) test method has shown promise for analysing the high strain rate behaviour of brittle materials. This test method uses a reflected compressive stress wave to generate tensile stress and failure in an impacted specimen. Throughout the propagation of the stress wave, full-field displacement measurements are taken, from which strain and acceleration fields are derived. The acceleration fields are then used to reconstruct stress information and identify the material properties. The aim of this study is to apply the IBII test methodology to analyse the stiffness and strength of ceramics at high strain rates. The results show that it is possible to identify the elastic modulus and tensile strength of tungsten carbide at strain rates on the order of 1000 s-1. For a tungsten carbide with 13% cobalt binder the elastic modulus was identified as 516 GPa and the strength was 1400 MPa. Future applications concern boron carbide and sapphire, for which limited data exist in high rate tension.

scholarly journals Measurement of fracture properties of concrete at high strain rates

2017 ◽  
Vol 375 (2085) ◽  
pp. 20160174 ◽  
Author(s):  
V. Rey-De-Pedraza ◽  
D. A. Cendón ◽  
V. Sánchez-Gálvez ◽  
F. Gálvez
Keyword(s):  
Tensile Strength ◽  
High Speed ◽  
High Strain ◽  
Experimental Testing ◽  
Direct Analysis ◽  
Strain Rates ◽  
High Strain Rates ◽  
Dynamic Tensile Strength ◽  
Element Analysis ◽  
Initial Work

An analysis of the spalling technique of concrete bars using the modified Hopkinson bar was carried out. A new experimental configuration is proposed adding some variations to previous works. An increased length for concrete specimens was chosen and finite-element analysis was used for designing a conic projectile to obtain a suitable triangular impulse wave. The aim of this initial work is to establish an experimental framework which allows a simple and direct analysis of concrete subjected to high strain rates. The efforts and configuration of these primary tests, as well as the selected geometry and dimensions for the different elements, have been focused to achieve a simple way of identifying the fracture position and so the tensile strength of tested specimens. This dynamic tensile strength can be easily compared with previous values published in literature giving an idea of the accuracy of the method and technique proposed and the possibility to extend it in a near future to obtain other mechanical properties such as the fracture energy. The tests were instrumented with strain gauges, accelerometers and high-speed camera in order to validate the results by different ways. Results of the dynamic tensile strength of the tested concrete are presented. This article is part of the themed issue ‘Experimental testing and modelling of brittle materials at high strain rates’.

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