Prediction of fatigue damage and life for composite laminates under service loading spectra

Abstract A residual stiffness degradation model, which has been proved to be capable of estimating the cumulative damage in composite laminates under constant amplitude loading, is used to investigate the fatigue damage of composite laminates subjected to service loading spectra. Baseline stiffness reduction data under spectrum loadings are incorporated in this model to predict the statistical distributions of the residual stiffness as well as the residual stiffness of an individual specimen. An empirical failure criterion is proposed and fatigue life distributions for composite laminates subjected to different levels (or severities) of spectrum loadings are theoretically derived. Experimental tests were conducted on graphite/epoxy laminates to generate statistically meaningful data for the verification of the theoretical approaches presented. Experimental test results demonstrate that the predictive capabilities of the proposed theoretical methods are quite satisfactory.

[1]  W. Hwang,et al.  Fatigue of Composites—Fatigue Modulus Concept and Life Prediction , 1986 .

[2]  Et Camponeschi,et al.  Compression of Composite Materials: A Review , 1987 .

[3]  J. N. Yang,et al.  Modulus reduction and fatigue damage of matrix dominated composite laminates , 1992 .

[4]  W. S. Johnson,et al.  Mechanisms of fatigue damage in boron/aluminum composites , 1982 .

[5]  R. Kim,et al.  Fatigue Behavior of Composite Laminate , 1976 .

[6]  Anoush Poursartip,et al.  The fatigue damage mechanics of a carbon fibre composite laminate: II—life prediction , 1986 .

[7]  H. Whitworth,et al.  Modeling Stiffness Reduction of Graphite/Epoxy Composite Laminates , 1987 .

[8]  H. Whitworth,et al.  Cumulative Damage in Composites , 1990 .

[9]  Tk O'Brien,et al.  Fatigue Damage: Stiffness/Strength Comparisons for Composite Materials , 1977 .

[10]  W. Hwang,et al.  Cumulative Damage Models and Multi-Stress Fatigue Life Prediction , 1986 .

[11]  Douglas L. Jones,et al.  A Stiffness-Based Statistical Model for Predicting the Fatigue Life of Graphite/Epoxy Laminates , 1989 .

[12]  Kenneth Reifsnider,et al.  Characterization and Analysis of Damage Mechanisms in Tension-Tension Fatigue of Graphite/Epoxy Laminates , 1984 .

[13]  T. O'Brien.  Characterization of delamination onset and growth in a composite laminate , 1982 .

[14]  Isaac M Daniel,et al.  Fatigue damage mechanisms and residual properties of graphite/epoxy laminates , 1986 .

[15]  J. N. Yang,et al.  Prediction of fatigue life for matrix-dominated composite laminates , 1993 .

[16]  W. Johnson.  Modeling stiffness loss in boron/aluminum laminates below the fatigue limit , 1983 .

[17]  Peter W. R. Beaumont,et al.  Matrix cracking and stiffness reduction during the fatigue of a (0/90)s GFRP laminate , 1985 .

[18]  Douglas L. Jones,et al.  A Stiffness Degradation Model for Graphite/Epoxy Laminates , 1988 .

[19]  M. Ashby,et al.  The fatigue damage mechanics of a carbon fibre composite laminate: I—development of the model , 1986 .