LAB+3+IMPACT+TEST - MFGT 150 Intro to Engineering Materials...

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MFGT 150: Intro to Engineering Materials Fall 2015 Lab 3: Charpy Impact Test Assignment Date: _____2/15/16_______ Student Names:_________________________ _______________________________________ _______________________________________ Purpose: Describe assignment purpose here… The purpose of this assignment is to measure impact energy on a piece of material through destructive testing. Introduction The Charpy V-notch (CVN) test was designed to measure the impact energy, sometimes called notch toughness. The specimen is in the shape of a bar of square cross-section, into which a V-notch is machined. The load is applied as an impact blow from a weighted pendulum hammer that is released from a cocked position at a fixed height (2 ft or 4 ft). There are three scales and these depend upon the weight of the hammer used: 15# Head reads 30 – 60 ft.lb, 30# Head reads 60-120 ft.lb and 60# Head reads 120-240 ft.lb. The tester for your lab has a 30 lb hammer set for 2 ft drop. The specimen is positioned at the base. Upon release, a knife edge mounted on the pendulum strikes and fractures the specimen at the notch, which acts as a point of stress concentration for this high velocity impact blow. The pendulum continues its swing, rising to a maximum height which is lower than the original height. The energy absorption computed from the difference between the heights is a measure of the impact energy (toughness). PRECAUTIONS WITH THE USE OF IMPACT TESTER 1. Be sure that the pendulum is free-swinging, and that fragments of broken specimens are removed before each test. 2. Be sure that the specimen is properly located and that the proper striking edge is securely fixed in the bob.
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