Material degradation of laminated composites subjected to laser irradiation

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:89889

Chen, J K; Allahdadi, F A ^[1]

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1. Phillips Laboratory, Kirtland AFB, NM (United States)

The effects of laser irradiation on the dynamic and buckling characteristics of organic-matrix composite laminates were investigated. An integral methodology used considers the evaluation of heat transfer process, thermal stresses, failure modes, and eigenvalues for natural frequency or buckling load. To model the heat transfer process, a modified Crank-Nicholson finite difference scheme, which includes the effects of surface ablation, degradation of thermophysical properties at elevated temperatures, and radiation and convection heat losses, was employed. The resulting geometry configuration and temperature distribution were incorporated into a laminated composite-plate finite element code for thermal stress, failure mode, free vibration, and buckling analyses. It was shown that material removal due to ablation and mechanical property degradation at elevated temperatures could significantly alter the dynamic and buckling characteristics of laminated composites.

• OSTI ID: 89889
• Report Number(s): CONF-9409291--; ISBN 1-56676-220-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
DEFORMATION
EPOXIDES
FAILURES
FINITE ELEMENT METHOD
GRAPHITE
HEAT TRANSFER
LASER RADIATION
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
STRESS ANALYSIS
THERMAL DEGRADATION
THERMAL STRESSES