Repeated impact behavior of glass/epoxy laminates

Abstract

The response of glass–epoxy composites to repeated impact for various impact energies ranging from 5 to 15 J was investigated. Specimens with two different stacking sequences were studied; [0/90/0/90]S and [0/90/+45/−45]S. In addition to the room temperature, impact tests were also performed at −40°C environmental test temperature for impact energy of 15 J. Contact force‐deflection and energy‐time curves at each test and the number of impacts to failure (Nf) were obtained for each experiment. Compression after impact (CAI) tests were also conducted to determine the residual load carrying capacity of the damaged specimens. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers

Influence of multi-impacts on GFRP composites laminates

“…Damage area increases with number of impacts, but after certain number of impacts it does not increase significantly [20]. Experimental tests developed by Icten [21] on Glass/Epoxy composites show that, except for the first three impacts, the maximum contact force decreases and energy absorbed by the composite increases with the impact number. At same time, the laminates impacted at low temperature (-40ºC) reveal higher peak force and lower absorbed energy than that impacted at room temperature.…”

Damage accumulation in braided textiles-reinforced composites under repeated impacts: Experimental and numerical studies

“…In real life, structural materials are subjected to repeated impacts more often than single impact, during manufacturing, routine maintenance and daily service activities [5]. Although single impact generates only minor damage, these flaws can easily accumulate because of repeated impacts [6][7][8].…”

“…Thus, it is important to study such accumulating effects of repeated impacts on composite structures [9]. Comparing with many studies on the single-impact response, there are a few works concerning repeated impacts and damage accumulation [5,10,11]. Hosur et al [5] studied the effect of stitching on a composite subjected to a certain number of repeated impacts with various impact energies.…”

“…Comparing with many studies on the single-impact response, there are a few works concerning repeated impacts and damage accumulation [5,10,11]. Hosur et al [5] studied the effect of stitching on a composite subjected to a certain number of repeated impacts with various impact energies. Belingardi et al [12] developed an analytical model to describe a life time of composite materials subjected to repeated impact loadings.…”

Low velocity impact damage evaluation in fiber glass composite plates using PZT sensors

“…Suemasu et al [13] concluded that the load carrying capability of the delaminated plate is reduced by the delamination propagation, and the strength of the damaged plate is strongly dominated by the beginning of the delamination growth. On the other hand, during the manufacturing process, routine maintenance operations or in-service conditions, some components can be subjected to repeated impacts at localized positions [14,15]. Sevkat et al [15] studied the effect of repeated impacts on the response of composites and concluded that the lay-up sequence has significant effect on the repeated impact response of the hybrid composites, and that repeated impacts can caused very quick damage accumulation and promotes a progression of the damage.…”