Technology Development Report -Model 301 HLH/ATC Cargo Handling System Coupling.

摘要

The report contains the results of a two-part Heavy Lift Helicopter (HLH) coupling development program. Part 1was a stress analysis of photoelastic epoxy models of two HLH cargo load beam configurations. The 'L'shape proved to be more efficient than the 'C'shape in minimizing the weight of the coupling;and high-strength steel proved to be a more efficient material for this application than titanium. In Part 2, a complete load beam was instrumented and tested in order to evaluate stress levels through ultimate failure. During testing,the load beam met the limit load requirement,but ultimate failure was premature due to the brittle nature of the material. Corrective measures,including more stringent material specifications and processes and redesign of the load beam trunnion,were recommended to overcome the discrepancy. Part 3contains the results of the ultimate test on the improved load beam. (Author)