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When a fastener is simultaneously subjected to a tensile and transverse shear load, it is unclear from the literature whether the tensile load results in a reduced allowable ultimate shear load and, if so, by how much. The relationship was investigated experimentally using test samples of 6Al-4V titanium and 17-4PH stainless steel. The specimens were loaded in tension and then pulled to failure in three-point shear. The tensile load was varied from 0% of the material's ultimate strength (pure shear failure) to 100% (pure tensile failure). In preliminary tests, the tensile load would drop as the specimen was tested due to lengthening of the specimen as a result of the shearing process. This would seem to indicate that in most practical applications, the tensile load will be greatly reduced as the fastener deforms in shear. The final test fixture kept a nearly constant tensile load on the specimens as they were sheared. Analysis of the resulting data revealed that a squared stress ratio interaction curve providedsatisfactory estimates of the ultimate shear strength of a fastener shank subjected to a constant tensile load.
combined loading, stress ratio, shear strength, shear loading, fastener strength
SVG Lithography, Wilton, CN