Abstract
The long-term mechanical fatigue of AS4/3501-6 graphite/epoxy quasi-isotropic laminates has been investigated to determine the influence of loading parameters on impact-induced delamination growth during constant amplitude, block, and spectrum fatigue loading. From the observed fatigue damage growth it is suggested that conservative damage tolerance criteria in the presence of barely visible impact damage should be based on static loading tests and a limited number of fatigue tests to determine the load levels that initiate delamination growth. For the type of impact damage and laminate configuration investigated in this study the fatigue limit is found to be 60% CSAI (compression strength after impact) in constant-amplitude compression-compression loading, and 65% CSAI under the spectrum loading conditions. Furthermore, the results of spectrum loading tests suggest that the durability testing can be accelerated by omitting from the standardized test sequence load levels in which the stress range is less than 20% CSAI.
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