Piezoelectric Washer for Accurate Application of Bolt Preload

A concept is proposed for monitoring bolt preload that offers accuracy and low-cost features not not available in existing preload monitoring systems. Existing washer size and load carrying capability information will be used to initiate the design. The goal is to retrofit the proposed Piezoelectric Fiber Composite Washer (PFCW) into a fastener assembly. PFCW prototypes will be fabricated using 3D printing technology. Comprehensive laboratory tests will be conducted to determine the load-voltage relationship. A prototype of a handheld device will be developed to demonstrate the real-time preload monitoring by relating the load to the collected voltage in the piezoelectric materials. More »