Modelling the flexural behaviour of sandwich composite materials under cyclic fatigue

Fatigue Performance of Sandwich Composites

“…Amplitude and energy level were found to be solely a function of material composition and independent of specimen geometry or mode of failure. This classification matched reasonably with the qualitative results reported in the literature [1,7,8].…”

“…Crack growth activity was dominated by the propagation near the interface between the facesheets and the core that lead to weakening of the two phase action and subsequent cracking of the facesheets. Some similarities to the failure sequence reported in the literature were observed except that in the current work significant fiber rupture never took place until catastrophic failure [1,7,8]. In the literature, the endurance limit for sandwich composites has been reported to be as low as 60% of the ultimate static load [7], however, life was found to be unlimited below 75% in the current study.…”

Static and Fatigue Characterization of Nomex Honeycomb Sandwich Panels

“…However, a comprehensive data base would be required in the fatigue analysis of sandwich composites, based on stiffness reduction, unless mathematical relationships can be developed to relate the residual stiffness to other readily material properties. If such a relationship could be established, extrapolation of data at various stress levels would be derived, thus the amount of test data needed to characterize the materials behaviour [13]. The modelling of the fatigue behaviour of composite material during three point bending tests has been proposed by different studies [14]- [15].…”

Experimental analysis of behavior and damage of sandwich composite materials in three-point bending. Part 2. Fatigue test results and damage mechanisms

“…Finally, the performances in fatigue can be characterized by the number of cycles necessary to cause failure o f the material when this number of cycles is reached. In our investigation, we have chosen the criterion N 10, which is the most frequently used in the literature [3][4][5][6][7][8][9][10][11][12][13]. Beyond 10%, many damage mechanisms are involved and their description becomes more difficult, for example, for higher damage rates, the effect o f local heating in the specimen cannot be neglected [7].…”