A combined analytical and experimental investigation has been undertaken to determine the effects of flaws on the static strength and fatigue life of graphite/epoxy (ASI/3501-6) laminates. Both bond-lined defects in sandwich beam construction and interlaminar disbond flaws were studied. Up to present, compressive strength test data have been obtained for ambient and elevated temperature, moisture-saturated conditions, including results from thermal-spike cycling simulating supersonic flight. In addition,baseline data have been obtained to define the strength parameters assocaited with the tensor polynomial lamina failure criterion. Although this model was originally derived for static 'unflawed' strength predictions, it is being extended to include the effect of holes and flaws. In the latter case, a finite element approach is described to illustrate the methodology for computing the influence of flaws. Finally, a formulation for predicting the fatigue life of laminates is presented based on the experimental evaluation of fatigue functions which are utilized in a form of the tensor polynomial failure criterion.
Computation of influence of defects on static and fatigue strenght of composites
Berechnung des Fehlereinflusses auf die statische und die Dauerfestigkeit von Verbundwerkstoffen
1983
17 Seiten, 23 Bilder, 4 Tabellen, 25 Quellen
Aufsatz (Konferenz)
Englisch
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