SWAGE TYPE FASTENER WITH OPTIMIZED LOCK GROOVES AND CRESTS AND METHOD OF DESIGNING SAME

摘要

A fastening system (10) is provided that includes a fastener having a pin (24) member (24) with a lock groove (26) and crest geometry that is optimized to receive swaged material from collars (14) of materials of different strengths for securing workpieces (18, 20) for different load applications. The lock grooves (26) have the longest width required for collars (14) of lower strength for one application or greater strength for a second application and the crests have the longest width required for collars of greater strength for the second application whereby satisfactory clamp and tensile loads and resistance to failure will result when the lock grooves (26) are filled with collar materials of different strengths. The lock groove (26) and crest geometry is of a uniform construction for the plurality of applications with pin members of a common diameter. Certain collars (14) of different materials have similar outside diameters for installation by a tool (48) having a swage anvil (56) with a uniform swage cavity that swages the collars (14) into the lock grooves for securing workpieces in shear, shear/tension, shear composite and shear/tension composite applications. A method of designing a fastener is also provided that has a uniform lock groove and crest geometry for use in the plurality of applications.