Publications

Evaluating the Influence of Size Effects on Load-Displacement Behavior and Failure in Threaded Fasteners, Part I: Experimental Testing

Bosiljevac, Thomas B.; Veytskin, Yuriy B.; Mersch, John P.; Smith, Jeffrey A.; Grimmer, Peter W.; Susan, Donald F.

In an effort to enhance both the experimental testing and computational modeling of small threaded fasteners, a collaborative investigation consisting of experimental tensile testing and computational modeling was conducted to observe the effects of threaded fastener size on load-displacement behavior and failure. This paper focuses on the experimental tests performed on NAS1351N00–4, NAS1352N02–6, NAS1352N04–8, NAS1352N06–10, and NAS1352N4–24 (referred to herein as #00, #02, #04, #06 and #4, respectively) A286 fasteners. Displacement measurements were obtained from three unique sources/locations: Differential Variable Reluctance Transducers (DVRTs) inserted in the top bushing to measure the relative displacement of the bushing faces, Linear Variable Differential Transducers (LVDTs) located on the outside edge of the bushing fixtures to measure a more global response of the bushing displacement, and the stroke of the test frame. This test series clarified many ambiguities in the experimental process and further established a feasible testing method for small fasteners.