No abstract

The demand for Composite structures is increasing in different engineering fields such as automobile, aircraft, civil because of its higher specific mechanical properties. It’s very important to consider failure modes like fiber breakage, delamination, matrix cracking, etc. when it is impacted by a foreign object such as dropping of tool (impact type events). Susceptibility of damage due to low velocity impact is more in the laminated composite structures than metal. It is important to study the response of composite for varying velocities with different boundary conditions in case of low velocity impact analysis. Thus, this paper presents the combined effect of different boundary conditions with varying velocities of impactor on low velocity impact modelling of CFRP composite laminates. Numerical analysis is performed on T700GC/M21 material with layup [02/452/902/-452]s to study the force-time/displacement curve. Numerical analysis is performed using ABAQUS 6.14. First, Numerical analysis is carried out for impactor velocities varying from 2.5 m/s to 10 m/s. In ABAQUS/Explicit, two boundary conditions i.e. simply supported edges boundary condition SSSS and Clamped supported edges, CCCC are used to study the force-time/displacement curve. Out of that numerical results of impactor velocity 5 m/s with boundary condition SSSS is validated with results of literature by studying force-time/displacement curves. The numerical findings revealed that; as impactor velocity increases, the force and displacement also increases. Also, current simulation results are closely matching with the existing numerical and experimental data.

No abstract

Present work aimed to investigate the hybridization effect of Kevlar and glass fibers to enhance the impact performance of CFRP composites under low velocity by numerical analysis. Analyzing the stack sequencing of Kevlar and glass fibers becomes essential to improve the impact resistance of CFRP composite structures. It is important to know the dynamic behavior of hybrid composites under LVI. To get the best possible stack sequence, numerical simulations were carried out on different stacking sequence combinations of Kevlar and glass with carbon fiber epoxy composites for 25 J energy levels. A virtual drop weight impact test conditioned numerical model created in Abaqus software mimics the actual intralaminar and interlaminar failure. Intralaminar models based on continuum damage mechanics and interlaminar, that is, delamination failure based on cohesive modeling used to evaluate the damage development and material behavior. From the obtained simulation results, the hybrid composites having Kevlar fibers exhibited superior impact resistance.

No abstract