BIAXIAL TESTING OF GLASS FIBER REINFORCED MATERIAL SYSTEMS

摘要

To study the behaviour of fibre reinforced composite laminates under static and cyclic in-plane complex stress states; a biaxial loading frame has been developed. Using four independent servo-hydraulic actuators a cruciform type specimen is biaxially loaded in its plane. During the test an appropriate control unit keeps the centre of the specimen at the same position. For obtaining reliable biaxial failure data the design of the cruciform specimen is of paramount importance. Finite element simulations of the cruciform specimen in combination with experiments using both strain gages and an optical-numerical full field method for strain determination over the entire biaxially loaded test zone have been carried out. This led to the proposal of an optimized geometry with a circular central region of reduced thickness and an adapted corner fillet at the intersection of the arms.