Shahrood University of Technology Journal of Solid and Fluid Mechanics 2251-9475 6 1 2016 03 20 Life prediction of reinforced Glass-Epoxy and Graphite-Epoxy polymers subjected to various loading conditions Life prediction of reinforced Glass-Epoxy and Graphite-Epoxy polymers subjected to various loading conditions 153 165 694 10.22044/jsfm.2016.694 FA I. Ahmadi University of Zanjan M. Khanmohammadi University of zanjan, Journal Article 2015 09 22 Investigation of the fatigue behavior of the reinforced polymer composites is necessary in order to design reliable and durable structure. Due to the difference between the fatigue properties of the reinforced polymers and the traditional isotropic engineering materials, introducing criteria for prediction of the fatigue life of the reinforced polymers will be very useful in design and analysis. This paper is aimed to life prediction of reinforced plates which is subjected to bending fatigue loads. The Glass-Epoxy and Graphite-Epoxy plates which are subjected to the distributed and concentrated bending loads are studied based on the strength degradation model. The distribution of the stresses at the plies of the plate subjected to transverse load is obtained using the first shear deformation plate theory. Then the strength degradation model is used to predict the strength reduction of each plies of the plate in each loading cycle. The degradation of plies and reduction of the strength in each loading stage are accumulated and the residual strength of plies is obtained as function of the load cycles. This procedure is repeated until the plies fail and the final catastrophic failure occurs in the plate. Investigation of the fatigue behavior of the reinforced polymer composites is necessary in order to design reliable and durable structure. Due to the difference between the fatigue properties of the reinforced polymers and the traditional isotropic engineering materials, introducing criteria for prediction of the fatigue life of the reinforced polymers will be very useful in design and analysis. This paper is aimed to life prediction of reinforced plates which is subjected to bending fatigue loads. The Glass-Epoxy and Graphite-Epoxy plates which are subjected to the distributed and concentrated bending loads are studied based on the strength degradation model. The distribution of the stresses at the plies of the plate subjected to transverse load is obtained using the first shear deformation plate theory. Then the strength degradation model is used to predict the strength reduction of each plies of the plate in each loading cycle. The degradation of plies and reduction of the strength in each loading stage are accumulated and the residual strength of plies is obtained as function of the load cycles. This procedure is repeated until the plies fail and the final catastrophic failure occurs in the plate. https://jsfm.shahroodut.ac.ir/article_694_7a80c0cc74ccec6198838b003f4e68ac.pdf