Effects of Freeze/Thaw Cycles on Hydrostatically Conditioned E-Glass/J-2 Composite.

摘要

A study was performed to determine if freeze/thaw cycles of a polymer matrix composite(PMC) with high moisture content cause increased mechanical property degradation. The PMC was a 36 ply glass fiber with a thermoplast matrix. Moisture was added hydrostatically at high pressure. it was observed that freeze/thaw cycles did not appreciably decrease the maximum load. However, from short beam shear(SBS) specimens taken from the top, middle and bottom of the hydrostatically conditioned sample, the load characteristics depended on specimen location. The middle SBS specimen had a maximum load very close to that for off the shelf dry samples. From optical microscopy it was observed that the freeze/thaw specimens failed with multiple delaminations while the dry samples failed with single delaminations. Further investigation of this observation is suggested.... Polymer matrix composite, E-Glass fibers, J-2 Thermoplast matrix, Moisture absorption, Hydrostatic pressure, Short beam shear strength.