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A computerized test system used for the determination of the ductile fracture toughness value JIc is described. The system is comprised of a Westinghouse 2500 computer coupled to a servohydraulic test machine by a 12-bit data acquisition system. A considerable savings in time has been realized in the data reduction and plotting of the data using this system.
The possible bounds on the accuracy of the overall testing system is discussed along with the effects on the calculated JIc value due to these inaccuracies. Examples of test data on ASTM Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels (A 508-77) and HY-130 high-strength structural steel is shown along with graphic plots of the JIc results.
It is expected that a fully computer controlled test will result from this initial test program.
computers, elastic, plastic, testing, toughness, ductile, automation, data acquisition
Senior engineer, Structural Behavior of Materials Department, Westinghouse Research and Development Center, Pittsburgh, Pa.
Senior technician, Plasma Physics Laboratory, Princeton University, Princeton, N.J.