Experimental Analysis of an MMC Military Track Shoe

Abstract

Abstract This paper describes the experimental analysis techniques used during the design of a prototype military track shoe utilizing cast metal matrix composite (MMC) material for use on future military vehicles. The program requirements were to retain the same functionality, strength, durability and wear characteristics as production forged steel track shoes, but with a significant weight reduction and comparable cost. In order to achieve these goals with such significant differences in mechanical properties, a thoroughly integrated design phase combining analytical modeling and experimental techniques was used. Finite element analyses were conducted during the initial design phase to optimize the structure. Various experimental techniques were used to validate the computer models and obtain reliable information in regions not accurately modeled. Destructive tests of the final design were also performed to determine failure loads. Experimental techniques were employed in three distinct phases: reflective photoelasticity and strain gage analysis of an aluminum filled epoxy model for initial analytical verification, transmissive analysis of a 3-D photoelastic model, and finally reflective photoelastic and strain gage analysis of the actual prototype MMC shoe. The results from all phases are discussed, but with greater emphasis on the experimental techniques.