A Study On Interface Damage Of Shape Memory Alloy Fiber Reinforced Composite

Composite material has played an important role in many areas of the industry withits unique material performance, especially in the aerospace, automobile structure, etc. Inthose industries, materials which have high strength-to-weight ratio, highstiffness-to-weight ratio and can be convenient to use and install are demanded. But thereare some shortages in composite materials, such as debonding; delamination; matrixfracture etc. These shortages lead to a significant decline in structure strength. Therefore,the safety and reliability of composite can be improved by reducing interface damage.Based on the cohesive zone model (CZM), this paper investigates the interfacedamage of composite material. In the first part, some factors which affect on interfacialdebonding are considered, such as fiber packing pattern, the modulus ratio of the fiber tomatrix, fiber volume fraction and direction of the load. In the second part, the conceptwhich improves damage resistance of composite materials by embedding small amountsof fibrous super-elastic shape memory alloy materials into brittle composite materialsunder the low velocity impact is investigated. This idea is examined via Finite ElementMethod (FEM) code ANSYS/LS-DYNA; several factors, such as temperature and thelocation of shape memory alloy materials are also investigated in the second part.Result of FEM calculation shows that particular fiber packing pattern, the modulusratio of the fiber to matrix can help to reduce the interface debonding. Delamination areacan be reduced greatly by embedding super-elastic shape memory alloy materials, becausea large amount of impact energy can be absorbed by shape memory alloys. Delaminationarea reduces as shape memory alloy materials are farther from impact face. But theinfluence of temperature on the results is not significant.