Bridge Fatigue Monitoring Device

摘要

This program involved development and design of the Twin Coupon FatigueMonitoring System and the concept validation in the laboratory. The Armored Vehicle Launched Bridge (AVLB) was selected as the basis for the design of the Fatigue Life Indicator (FLI) system. The Directorate of Combat Engineering at Ft. Belvoir, VA provided static test data and design life criteria for the bridge. No fatigue data was available for this bridge. The twin coupons were initially designed for a wide stress range. In consideration of the fact that the load rating of the AVLB may be upgraded and that this FLI system may be later applied to higher stress bridges such as the Light Assault Bridge (LAB), initial material selection and sizing calculations were made at 24 Ksi. Later in the program, the initial crack lengths were adjusted to better suit field proof-of-concept testing on the AVLB.