A novel method for determining dynamic fracture toughness

Anderson, C. E.; Popelar, C. H.; Nagy, A.; Walker, J. D.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p505
Academic Journal
Drop weight or pendulum machines are frequently used to determine the dynamic fracture toughness of a material. Determination of the dynamic fracture toughness requires an analysis of the experiment, but unfortunately the boundary and loading conditions are not directly measurable in these tests or have a degree of uncertainty making the analysis difficult. A novel dynamic fracture test that overcomes many of these difficulties is described. A gas gun launches a striker bar at a known speed that impacts a transmitter bar in contact with a pre-cracked three-point bend specimen and fractures the specimen. The specimen is instrumented with a crack ladder gage, crack opening displacement gage and strain gages. A fracture mechanics model is used to determine the dynamic fracture toughness.


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