MSE_104_W08_handout for impact and hardness test copy

MSE_104_W08_handout for impact and hardness test copy -...

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Department of Materials Science and Engineering, UCLA MSE 14 Impact and Hardness Testing of Metallic Alloys Part 1: Charpy Impact Test: 1. Introduction Fracture mode includes: Ductile: high energy absorption, large plastic deformation Brittle: low energy absorption, little or no plastic deformation. Toughness: a measure of the ability of a material to absorb energy up to fracture. There are two standardized tests to measure impact energy: Charpy Impact Test and Izod Impact Test. Impact energy depends on strength, ductility, impact rate and testing temperature. Equipment and specimen used for Charpy impact test is as shown in Figure 1 and Figure 2.
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Ductile-to-Brittle-Transition: Transition from brittle to ductile fracture with increasing temperature (Figure 3). Only BCC and HCP alloys display this behavior around room temperature. 2. Objective Understand how temperature affects the ductile-brittle property of low carbon steel 3. Experiment Materials : The specimens tested are low carbon steel and PMMA
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