Penetration Fracture Characteristics of CFRP Curved Shells According to Oblique Impact

Abstract

CFRP (Carbon Fiber Reinforced Plastics) of the advanced composite materials as structural materials for vehicles, has a wide application in light weighs structural materials of airplanes, ships and automobiles because of high strength and stiffness. However, there is a design variable to be considered in practical application of the laminate composite material, that is, this material is vulnerable to transverse impact. This paper aims at evaluating the effects of curvature and oblique impact on the penetration characteristics of composite laminate shells. They are stacked to [02/902]S, [03/903]S and [02/903/0]S, [0/902/0]S and their interlaminar number two and four. Those specimens were prepared to varied curvature radius (R=100, 150, 200mm and ∞). They are cured by heating to the appropriate hardening temperature (130oC) by means of a heater at the vacuum bag of the autoclave. Test specimens were prepared with dimensions 100mm×140mm. When the specimen is subjected to transverse impact by a steel ball, the velocity of the steel ball was measured both before and after impact by determining the time for it to pass two ballistic-screen sensors located a known distance apart. In general, the critical penetration energy increased as the curvature increased, interface decreased and slope angle on the impact surface increased.

Parameters influencing the impact response of fiber-reinforced polymer matrix composite materials: A critical review

“…Interestingly, they also noticed that the energy dissipated by the target reduced and then rose with the angle of impact. In 2006 Yang, I. Y et al [291] studied the influence of oblique impact on the penetration characteristics of composite laminates, reporting that the penetration energy raised as the angle of slope on the target increased. W. Xie et al [292] studied the ballistic impact response of CFRP composites at impact angles of 0°, 30° and 45° with the velocity ranging from 70 to 280 m/s.…”

Study on High-Velocity Impact Perforation Performance of CFRP Laminates for Rail Vehicles: Experiment and Simulation

“…The parameters affecting the performance of fiber-reinforced composites under dynamic impact can be classified into four types, including material-based parameters, geometry-based parameters, impactor-based parameters, and environmental-based parameters [15]. Many studies have also carried out parametric response studies for high-velocity impacts through experiments and simulations [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The mechanical properties of the laminate itself have a decisive influence on the resistance to high-velocity impact.…”

“…An analytical model was developed by Lopez-Puente et al [24] to predict the residual velocity as well as the ballistic limit. Another critical factor is the obliquity of HVI [25][26][27][28]. Yuan et al [23] investigated the laws governing the effects of projectile size and mass on the impact response of CFRP laminates.…”