Abstract
In the previous study, the authors proposed hybrid FRP sheets consisting of several types of fibers with various specific properties and investigated their mechanical properties. The observed stress drop due to the gradual rupture of higher modulus, higher strength and/or higher ductility fibers is a concern and should be controlled. It was experimentally confirmed that integrated performance, including tensile strength, stiffness, and ductility could be thoroughly realized through appropriately hybridizing high modulus fibers, high strength fibers, and high ductility fibers for which the stress drop can be controlled within a required range. In this study, a control index for controlling the stress drop is first designed. Through a quantitative investigation with an experimental program, the relationships between the control index and stress drop are identified for different hybridizations including high modulus-high strength hybrid fibers sheet, high strength-high ductility hybrid fibers sheet and high modulus-high ductility hybrid fibers sheet.
