The effect of water absorption on the stress transferability across E‐glass fiber/nylon 6 interface has been studied using the embedded single fiber composite technique. The behavior of silane coated fiber and untreated fiber composites after periods of water immersion were compared. The silane coating provided both higher interfacial shear stress transferability and protection from permanent water damage in the interphase region. It was found that water absorption in the nylon matrix reduced the shear stress transferability through plasticization of the matrix, weakening of the interface, and the development of tensile swelling stresses at the phase boundaries. In untreated materials the shear stress transferability was limited by decoupling of the matrix from the broken fiber ends by either interface slippage or local plane strain fracture in the interphase region near the fiber end. In the silane treated materials the shear stress transferability was limited by constrained yielding of the polysiloxane/nylon interphase at the fiber end, thus indicating plasticization of the matrix was the primary factor. After 20 days of water immersion, there was permanent deterioration of stress transferability in the untreated samples, but very little permanent damage in the treated samples.
Abstract:In order to study the impact resistance of new resin-based fiber composite materials and apply them to the electric vehicle battery PACK box, the dynamic simulation for fiber composite laminates is carried out based on ANSYS ACP module and Explicit Dynamics module. In the calculation of the finite element model, the damage of the material is judged according to the change of the maximum stress and the maximum strain of the top surface about experiment samples. Calculate the difference between the stress or strain of the carbon fiber and the glass fiber at different impact heights to determine whether they have a good resistant ability to impact. Finally, compared with the results of hammer-dropping test, verify the accuracy and reliability of numerical simulation method.
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