Mechanical performance of CF/polymer composite laminates under cryogenic conditions

Takahira Aoki, Takashi Ishikawa, Hisashi Kumazawa, Yoshiki Morino

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

The basic mechanical performances of carbon fiber reinforced plastics (CFRP) material systems are experimentally and analytically evaluated to discuss their applicability to the cryogenic propellant tanks of planned future reusable launch vehicles. The materials are based on different types of epoxy matrices, bismaleimide matrix and PEEK. The temperature dependent anisotropic elastic constants and thermal expansion coefficients are experimentally obtained and used in the analytical predictions of delamination propagation, matrix crack onset, and propellant leakage. The use of temperature dependent material constants is essential for analysis with higher accuracy. Static tensile tests revealed that the matrix cracks tend to take place at drastically lower mechanical load under cryogenic environment, posing the possibility of propellant leakage through the chain of these matrix cracks. Interlaminar fracture toughness of epoxy based composite increased at cryogenic condition. Numerical predictions of delaminations and matrix cracks based on the simple energy release rate calculations are shown to be in good agreement with the experimental results. Simple conductance model of thicknesswise propellant leakage through the chain of matrix cracks is developed and successfully compared with the gas helium leakage test.

Original languageEnglish
Title of host publication41st Structures, Structural Dynamics, and Materials Conference and Exhibit
Publication statusPublished - 2000
Externally publishedYes
Event41st Structures, Structural Dynamics, and Materials Conference and Exhibit 2000 - Atlanta, GA
Duration: 2000 Apr 32000 Apr 6

Other

Other41st Structures, Structural Dynamics, and Materials Conference and Exhibit 2000
CityAtlanta, GA
Period00/4/300/4/6

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanics of Materials
  • Building and Construction
  • Architecture

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