Determination of High-Strain-Rate Stress–Strain Response of Granite for Blast Analysis of Tunnels

Abstract With advances in computational techniques, numerical methods such as finite element method (FEM) are gaining much of the popularity for analysis as these substitute the expensive trial and error experimental techniques to a great extent. Consequently, selection of suitable material models and determination of precise material model constants are one of the prime concerns in FEM. This paper presents a methodology to determine the Johnson-Cook constitutive equation constants (JC constants) of 97 W Tungsten heavy alloys (WHAs) under high strain rate conditions using machining tests in conjunction with Oxley’s predictive model and particle swarm optimization (PSO) algorithm. Currently, availability of the high strain rate data for 97 WHA are limited and consequently, JC constants for the same are not readily available. The overall methodology includes determination of three sets of JC constants, namely, M1 and M2 from the Split-Hopkinson pressure bar (SHPB) test data available in literature by using conventional optimization technique and artificial bee colony (ABC) algorithm, respectively. However, M3 is determined from machining tests using inverse identification method. To validate the identified JC constants, machining outputs (cutting forces, temperature, and shear strain) are predicted using finite element (FE) model by considering M1, M2, and M3 as input under different cutting conditions and then validated with corresponding experimental values. The predicted outputs obtained using JC constants M3 closely matched with that of the experimental ones with error percentage well within 10%.

Download Full-text

Taylor impact test revisited: Determination of plasticity parameters for metals at high strain rate

International Journal of Solids and Structures ◽

10.1016/j.ijsolstr.2020.02.020 ◽

2020 ◽

Vol 193-194 ◽

pp. 357-374 ◽

Cited By ~ 2

Author(s):

Subhajit Sen ◽

Biswanath Banerjee ◽

Amit Shaw

Keyword(s):

High Strain Rate ◽

Strain Rate ◽

Impact Test ◽

High Strain ◽

Taylor Impact ◽

Taylor Impact Test

Download Full-text

High Strain-Rate Compressive Behavior and Constitutive Modeling of Selected Polymers Using Modified Ramberg-Osgood Equation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.566.80 ◽

2014 ◽

Vol 566 ◽

pp. 80-85

Author(s):

Kenji Nakai ◽

Takashi Yokoyama

Keyword(s):

High Strain Rate ◽

Strain Rate ◽

Compressive Stress ◽

Constitutive Modeling ◽

High Strain ◽

Strain Rates ◽

Stress Strain ◽

Strain Behavior ◽

Least Squares Fit ◽

Wide Range

The present paper is concerned with constitutive modeling of the compressive stress-strain behavior of selected polymers at strain rates from 10-3 to 103/s using a modified Ramberg-Osgood equation. High strain-rate compressive stress-strain curves up to strains of nearly 0.08 for four different commercially available extruded polymers were determined on the standard split Hopkinson pressure bar (SHPB). The low and intermediate strain-rate compressive stress-strain relations were measured in an Instron testing machine. Six parameters in the modified Ramberg-Osgood equation were determined by fitting to the experimental stress-strain data using a least-squares fit. It was shown that the monotonic compressive stress-strain behavior over a wide range of strain rates can successfully be described by the modified Ramberg-Osgood constitutive model. The limitations of the model were discussed.

Download Full-text