Buckling Buhavior And Delamination Expansion Of Composite Laminates With Delamination Damage

Since the composite material has a very good material properties and less dense, so the aircraft structure design has been widely used. However, hierarchical and stratified expansion buckling phenomenon Composites serious impact on stability of the composite material structure, and therefore the composite buckling and delamination growth of research has a very important significance.In this paper, the composite laminates designed a series of pre-stratified, including different hierarchical position hierarchical dimensions, layered size and quantity as stratification variables, set pre-stratified, so that different pre-stratified study buckling load of laminate, layered effect extended its fatigue life.Firstly, with the percentage PATRAN containing sub-layer laminate board preset numerical simulation, the critical buckling load, and then take a different buckling load loading, delamination growth trend observed Laminates. Then again no damage laminates buckling simulation, critical buckling load, containing pre-sub-layer plywood compare and analyze the different stratification factors buckling load and load-bearing capacity of the composite laminate. And then were to no damage laminates and composites containing pre-layered composite laminates compression test, get their buckling load, analyze, and then with the numerical simulation results were analyzed. Finally, the pre-sub-layer laminate containing the fatigue test to obtain a number of different pre-fatigue life of laminated board minutes, and then analyzes the effects of different pre-stratification of laminates fatigue life. Thereby obtaining the following conclusions:1 When the pre-stratified size, shape homogeneous at the same time, the preset distance farther stratified center layer laminate, laminate carrying capacity greater decline, the carrying capacity of the weaker.2 When the preset hierarchical position, while the shape of the homogeneous, pre-tiered hierarchical larger the area, the carrying capacity of laminate decline greater carrying capacity weaker.3 When the pre-stratified size, location homogeneous at the same time, pre-tiered circular layered laminate than the preset rectangular laminate carrying capacity is weak.4 The number of pre-tiered hierarchical more carrying capacity laminate decline, the more prone to buckling.5 Coupled prefabricated hierarchy center at the center of the circular pre-tiered test pieces fell more than the pre-tiered hierarchical preset at the edge of the rectangle bearing capacity, more prone to buckling, and thus destroyed.6 The preset sub-layer laminate expansion trend is to extend along the vertical stratification first loading direction, and then to extend along a direction parallel to the load.7 containing pre-strong central sub-layer laminate board resistance to fatigue, the fatigue test is applied to 80% of its buckling load is not likely to cause its delamination growth. Including pre-edge sub-layer laminate panels weak resistance to fatigue, the fatigue test is applied to 80% of its buckling load likely to cause its delamination growth.