Dynamic fracture characteristics of highly brittle materials by using Instrumented Charpy Impact Test |
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Authors: | Ouk Sub Lee Seong Kyeong Hong |
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Affiliation: | (1) Mechanical Engineering Department, Inha University, 402-751 Inchon, Korea |
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Abstract: | In This study we investigate the dynamic fracture characteristics of a tungsten carbide cobalt (WC-6wt%Co) composite material.
The dynamic fracture initiation toughness and some of the dynamic fracturing characteristics are evaluated by using the Instrumented
Charpy Impact Testing (ICIT) procedure. The dependence of measured time-to-fracture on the tup impact velocity and the dynamic
fracture toughness for the WC-6wt%Co composite material are obtained by using ICIT. The effect of the loading rate on fracture
initiation toughness is found to be negligible when the time-to-fracture is on the order of 50μsec. At significantly higher
rates of loading it is impossible to determine the apparent dynamic fracture initiation toughness because of the influence
of the inertia force on fracture loading. It is found that the impact velocities affect the time-to-fracture significantly
at lower impact velocities for various engineering materials. It is shown that with the decrease of tup impact velocities
the time-to-fracture is increased and the dynamic fracture initiation toughness converges to static fracture toughness. |
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Keywords: | Dynamic Fracture Initiation Toughness Inertia Force ICIT (Instrumented Charpy Impact Test) Stress Intensity Factor Strain Tungsten Carbide Cobalt Composites Time-to-Fracture Tup Impact Velocity |
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