抄録
Glassfiber reinforced plastics (GFRP) are becoming increasingly useful for insulating and structural applications of cryogenic machines. The pureose of this paper is to point out the special stress-strain characteristics of GFRP at cryogenic temperature.
GFRP was the only composite which showed the increasing burst elongation at 77°K. But clear knee point had appeared on stress-strain diagram and over this knee point clear cracks in matrix had appeared.
The elongation to this knee point or to the first crack appearance was shown to be influenced by the matrix elongation. The difference of crack appearance at 300°K and 77°K was explained by microwave measurement.
