Experimental and Numerical Investigation of Mode I and Mode II Interlaminar Behavior of Ultra-Thin Chopped Carbon Fiber Tape-Reinforced Thermoplastics

摘要: This manuscript describes an experimental and numerical study conducted to investigate two representative cases of delamination in ultra-thin chopped carbon fiber tape-reinforced thermoplastics (UT-CTT): a double cantilever beam (DCB, mode I) end-notched flexure (ENF, II). In examples I delamination, unstable crack growth resulted sawtooth-like load–displacement curves after the initial stage increasing load, while some specimens displaying II exhibited stable propagation. The surfaces DCB ENF UT-CTT were observed by three-dimensional measurement macroscope scanning electron microscope. values interlaminar fracture toughness obtained based on linear elastic mechanics theory reference JIS K 7086 standard, respectively. Furthermore, analysis utilizing surface-based cohesive zone model triangular traction–separation law was used predict behavior UT-CTT. minimum maximum critical strain energy release rate define range corresponding propagation under I, parameters including shear strength friction taken into account for predictions II. numerically predicted showed good correlation with theoretical results. research provides mechanical properties damage modeling simulation method express behaviors structures.