Research On Fatigue Failure Property Of Composites Laminates

Composite materials have been widely used in many industries such as marine, automobile and aerospace. Among all composite materials the one with fabric draws more and more attention of researchers and engineers for its high strength, material designability, and thermal expansion coefficient and many other advantages. Based on the fatigue test of fabric layer composite materials, the article explored the fatigue properties of the fabric composite laminated plates. A fatigue life prediction method of cumulative damage failure which is suitable for fabric composite laminates was developed.Secondly, quasi-static tension of the fabric unidirectional laminates were carried out and then its tensile and shear strength were analyzed. T-T fatigue tests were conducted after that and the stress-life curves of unidirectional fabric panels were obtained. The different fatigue failure modes could be analyzed from the curves above. Mathematical software was utilized to fitting the strength and stiffness degradation formulas of fabric composites.Thirdly, based on the cumulative damage life prediction method of fabric composite laminates which was promoted in this article, the ABAQUS UMAT was coded by the FORTRAN program in order to do more analysis for instance the stress analysis of containing holes, asymmetric ply fabric laminate, determination of failure modes of fatigue damage, the gradual and sudden degradation of material properties and fatigue life prediction.Finally, fatigue test of fabric laminates with a hole was conducted to verify the numerical simulation in this article. Comparison between test and simulation confirmed the rationality and reliability of cumulative damage fatigue life prediction method for the fabric composite laminates which was developed in this article.