Evaluation of Materials for Air Force Systems and Hardware Applications.

摘要

This report summarizes the evaluation of a variety of materials and related engineering studies completed under contract to the Materials Support Division of the Air Force Materials Laboratory. It is divided into two sections, one covering mechanical properties of structural materials and the other the evaluation of nonstructural materials. Included in the first section are studies involving the crack resistance of B-1 materials and the evaluation of a landing gear side brace which were conducted in direct support of Air Force systems. Other more general studies were conducted on 7475 and X2040 aluminum alloys, Ti-6-4 and Ti-6-6-2 annealed forgings, beta processed titanium, and D6ac steel. The second section of the report describes in detail a comprehensive test program to evaluate elastomeric ground water seals for missile silos. High temperature sealants for use in F-111 and C-130 aircraft fuel tanks were also evaluated. Another program discussed involves the evaluation of O-ring packings in a dynamic test mode. Two structural adhesives were evaluated to determine their performance in a high temperature, high humidity environment. The final program discussed involves the evaluation of thermoplastics for use as rotating bands on 20mm projectiles. A total of eighteen injection molded thermoplastic materials were evaluated along with eleven adhesives and four primers. Results of the screening tests (Falling dart type) as well as actual gunfire testing are discussed. (Author)