复合材料圆柱壳体的层间断裂韧性分析

Analysis of the Interlaminar Fracture Toughness of Composite Cylindrical Shells

针对复合材料圆筒的层间性能分析,通过双悬臂梁试验(Double Cantilever Beam,DCB),得到了复合材料I型层间开裂与载荷对应关系,并根据GIC计算公式得到了材料I型断裂韧性。通过三点弯试验(EndNotched Flexure,ENF),计算了材料II型断裂韧性。建立了有限元模型,将I型断裂韧性、II型断裂韧性代入材料本构模型参数,对该结构层间性能设计与评估提出理论指导。

The interlaminar performance of composite cylinders is analyzed.Through the Double Cantilever Beam(DCB)test,the correspondence between the Type I interlaminar cracking and load of the composite material is ob-tained,and its Type-I fracture toughness is obtained according to the G1C calculation formula.Through the three-point End-Notched Flexure(ENF)test,the Type-II fracture toughness of the material is calculated.A finite ele-ment model is established,and Type-I fracture toughness and Type-II fracture toughness are substituted into the constitutive model parameters of the material,which provides theoretical guidance for the design and evaluation of the interlaminar performance of the structure.