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Краткое название
Apparatus for impact-fatigue testing
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A standard impact machine was extensively modified to allow the measurement of the response of specimens to repeated, controlled impact pulses. This equipment enables one to vary the temperature (76-297 K), specimen geometry (uniaxial, biaxial, triaxial stress systems), and load levels. At stress levels in the neighborhood of the yield stress, on the order of 10,000 impact cycles are needed to fatigue specimens to fracture. Strain rates achieved are moderately high, of the order of 1000 min-1, which conveniently form intermediate data between tensile (max. of about 100 min-1) and explosive straining data (about 6000 min-1). Contrasted to standard fatigue tests, no constraint is placed on specimen elongation and only unidirectional stresses are imposed. Typical impact-fatigue results for AISI 310 stainless steel are presented.