Static and fatigue tests of interface peeling of GFRP-balsa broken core beam
A"broken core beam"specimen with interfacial and core material cracks was designed based on the engineering applicable glass fiber reinforced composite(GFRP)-light wood sandwich structure.The regularity of the interfacial peeling failure of GFRP light wood sandwich structures was studied through three-point bending static and fatigue tests,the a-N curves of specimens under different span height ratios,stress ratios,and load levels were obtained,and the effects of different parameters on interfacial fatigue peeling failure were analyzed;and a fatigue crack growth rate model was established based on Paris theory.The results show that the designed broken core beam specimen can achieve stable interfacial crack growth;in fatigue tests,the interfacial peeling failure exhibits a distinct"three stage"characteristic,and the fatigue crack peeling rate increases with the de-crease of stress ratio and the increase of load level,respectively;the fatigue crack growth rate model using the strain energy release rate range as the control parameter can better describe the interfacial stripping process.
NETL
NSTL
万方数据
