Ply-Level Behavior of Carbon/Epoxy Composites Mechanically Cycled at Cryogenic Temperatures

Document Type

Conference Paper

Publication Date


Publication Source

46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, Structures, Structural Dynamics, and Materials and Co-located Conferences


Polymer matrix composites are candidate materials in tanks, lines, ducts, and valves used to store and transport cryogenic liquids. The use of these materials at cryogenic temperatures necessitates an understanding of the fatigue life and microcracking extent (which could effect permeation and leakage) at these reduced temperatures.

This study presents ply-level (90° and +/-45°) fatigue life test results for Cytec IM7/977-2, a carbon fiber reinforced toughened epoxy. The test results showed a power-law relationship between the applied stress level and the cycles to failure for both the 90° and +/-45° laminates, and for the three test temperatures of -321°F, room temperature, and 300°F. In addition, for both stacking sequences, the laminates tested at the cryogenic temperature showed longer fatigue lives, for a given cyclic stress level, than those tested at room temperature as well as elevated temperature.




Permission documentation filed.


American Institute of Aeronautics and Astronautics

Place of Publication

Austin, TX