Evaluation of a design standpoint of structural CFRP used in space

Results of an experimental investigation tracing the effects of the thermal cycle and irradiation on mechanical properties of CFRP and adhesives are reported. The IM-6/6376 toughened epoxy composite and T800/PMR-15 heat-resistant polyimide composite, as well as nine typical types of epoxy adhesives were selected as candidate structural materials for future space applications. These materials were subjected to up to 10 MGy irradiation and/or 3000 thermal cycle (-100 to 100 C), which simulates the space environmment. Specimens were mechanically tested over the above temperature ranges. The IM-6/6376 composite was not affected by irradiation and/or the thermal cycle, and it exhibited essentially good overall durability performance in the space environment. T-800/PMR-15 was not affected by irradiation, and showed good durability against radiation. The adhesives were greatly affected by irradiation and/or the thermal cycle, and showed sensitivity to the space environment. 6 refs