Evaluation of ultimate strength of high temperature composite materials for sst structures at elevated temperatures and after thermal aging

摘要

The objective of this experimental study was to evaluate the effect of thermal aging on the ultimate strength of three kinds of carbon/high-temperature polymer composite materials, which are current candidate structural materials for a super sonic transport of the next generation. The notched and unnotched panels, before being machined to specimens, next generation. The notched and unnotched panels, before being machined to specimens, next generation. The notched and unnotched panels, before being machined to specimens, were aged at 120 deg C and 180 deg C for up to 15,000 hours. Static tests at room and elevated temperatures before and after thermal aging provided the notched tensile, notched compressive, and short beam shear strengths. Moreover, the effects of five oxidation resistant treatments on notched compressive strength at 180 deg C were investigated after thermal aging of 5,000 hours at 180 deg C. The obtained results were presented and a possibility to develop an accelerated environment test methodology is examined.