Experiments on mixed Ⅰ/Ⅱ interface debonding of GFRP-Balsa sandwich structure
In order to study the interface bonding property and debonding failure mechanism of light wood sandwich composite structure for engineering suitability,the single leg bending test(SLB)on different span height ratios of the glass fiber reinforced composite Balsa light wood(GFRP)was conducted,and the mixed Ⅰ/Ⅱdebonding failure mode,load displacement variation law and crack growth length curve were obtained,the strain energy release rate of interface crack was calculated and the applicability of the linear propagation crite-rion of interface crack was verified.Results show that the surface layer of glass fiber will be damaged during crack development,and glass fiber delamination and fracture will occur on the surface of core material after interface debonding;with the reduction of span height ratio,the time of crack initiation is slower,the propaga-tion speed is smaller,and the ultimate load is larger;after interface debonding,the debonding load decreases with the continuous growth of cracks;the strain energy release rate increases with the crack growth,and in-creases significantly with the decrease of the span height ratio.
compositesandwich structureinterface debondingstrain energy release rateinterface crack ex-tension criterion
NETL
NSTL
万方数据
