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The Influence of Hygrothermal Conditions on the Damage Processes in Quasi-isotropic Carbon/epoxy Laminates by K. Ogi; H.S. Kim; T. Maruyama; Y. Takao is a Engineering article available to read on EtoBox.

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The eects of hygrothermal conditions on damage development in quasi-isotropic carbon-®ber/epoxy laminates are described. First, monotonic and loading/unloading tensile tests were conducted on dry and wet specimens at ambient and high temperatures to compare the stress/strain response and damage development. The changes in the Young's modulus and Poisson's ratio were obtained experimentally from the monotonic tensile tests. The critical stresses for transverse cracking and delamination for the above three conditions are compared. The delamination area is measured by using scanning acoustic microscopy (SAM) at various loads to discuss the eects of delamination on the nonlinear stress/strain behavior. Next, the stress distributions under tensile load including hygrothermal residual stresses are computed by a ®nite-element code and their eects on damage initiation are discussed. Finally, a simple model for the prediction of the Young's modulus of a delaminated specimen is proposed. It is found that moisture increases the critical stresses for transverse cracking and delamination by reducing the residual stresses while high temperature decreases the critical stresses in spite of relaxat

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Author

K. Ogi; H.S. Kim; T. Maruyama; Y. Takao

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0266-3538)

Published

1999

Language

EN

Field

Engineering (Physical Sciences)