Abstract
Various matrix failure modes (intralaminar and interlaminar) in T300/934 graphite/ epoxy laminates are studied. The intralaminar mode is considered by using centre-notchedtension. surface-notched-tension, three-point-bend and compact-tension specimens where transverse fracture toughness and 0° split initiation are investigated. The interlaminar fracture is studied by using double-cantilever-beam and cracked-lap-shear specimens for mode 1 and mode 2 respectively. A simple method for the prediction of split initiation is given and it is seen that the predicted and experimental results agree well. In addition to testing the dry specimens. a few hygrothermal conditions are also used to assess the influence of environment on various failure modes. The effect of environment shows a mixed trend on fracture toughness depending on damage mechanisms involved in the failure modes. The moisture and temperature show a deleterious effect on interface-controlled failure modes, but a beneficial effect on the modes controlled by matrix cleavage.
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