Characterization of Resin-Injection Repair of Impact Damage in Polymer Matrix Composite
13 Nov 2015-
TL;DR: In this article, the authors used an in-house developed repair methodology to repair impact damage in polymer matrix composites using a resin injection repair methodology, which is effective for the repair of low energy impact damage but not in the case of medium and high energy impact damages.
Abstract: Resin injection repair of impact damage in polymer matrix composites is studied using an in-house developed repair methodology. Carbon fiber reinforced polymeric composite specimens were impacted for three levels of impact damage (23 J, 35 J and 51 J — typical of low energy, medium energy, high energy) using a drop tup test rig and the damage zone was characterized using ultrasonic C-scan technique. The impact damaged specimens were repaired using a resin infiltration method. The selection of low viscosity room temperature curing resin, and process parameters such as resin injection pressure and vacuum levels to be maintained were studied to arrive at optimum repair method. The tension, compression strength of laminates prior to impact and post-impact as well as post-repair was studied to assess the quality of repair method. The results indicate that the chosen resin injection repair is effective for the repair of low energy impact damage but not in the case of medium and high energy impact damage.Copyright © 2015 by ASME
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TL;DR: In this article, a composite laminate under a flexural load was repaired by micro-bolts and adhesive resin, and the results showed that the resin-injection repair, which injects resin into the delamination to bond the entire separated surface area, is more effective than using microbolts if the flexural loading is predominant.
14 citations
TL;DR: In this article, a study of drilling-induced damage in barely visible impact damaged (BVID) carbon fibre reinforced polymer (CFRP) laminates where small circular holes were intentionally drilled into the impacted zone as an intermediate step of the resin-injection repair process was described.
14 citations
TL;DR: In this article , a shape delamination cracks in carbon fiber composites were successfully repaired utilizing the capillary action of acetone-diluted resin solutions (without hardener) by applying the normal resin/hardener mixture at the open delamination edge so the hardening process could take place inside the resin-filled delamination cracked with time.
Abstract: Shape delamination cracks in carbon fiber composites were successfully repaired utilizing the capillary action of acetone-diluted resin solutions (without hardener). Resin pre-coating (RPC) solutions with 5, 10, 15, 30 and 45 wt% resin were tested and their repair effectiveness were compared. Resin curing inside narrow delamination cracks was achieved by applying the normal resin/hardener mixture at the open delamination edge so the hardening process could take place inside the resin-filled delamination cracks with time. Compressive tests were performed after 7, 21 and 42 days of repair to study the influence of curing period. The edge delamination was introduced through light impact at the edge of CFRPs panels. Compressive failure loads after repair showed that the 30 wt% of RPC solution yielded the most favorable repair result for the 7-day curing time. With 21- and 42-day curing times, even the least favorable repair condition of 5 wt% of the RPC solution produced significantly improved repair results. X-ray scanning was used to reveal the internal delamination before and after repair.
7 citations
TL;DR: In this article , the authors presented the details of multi-wall carbon nanotubes (MWCNTs)-modified resin injection repair aiming to enhance the mechanical properties, considering the flexural and compression behavior.
Abstract: This study presented the details of multi-wall carbon nanotubes (MWCNTs)-modified resin injection repair aiming to enhance the mechanical properties, considering the flexural and compression behavior. The resin injection of epoxy resin dispersed with MWCNTs (0.1, 0.3, and 0.5 wt.%) as low viscosity resin that delaminated composite structure repair was conducted using a developed vacuum-based resin injection system at 80°C with constant injection pressure. The quasi-static indentation (QSI) method with a circular window was applied to create the barely visible impact damage (BVID) in the laminate specimen and thus obtain the delamination damage with reproducibility. The flexural strength and compression after impact (CAI) test were conducted on repaired carbon fiber reinforced laminates to assess the effect of the dispersion of the MWCNTs in the epoxy resin injection approach compared to neat epoxy resin. The mechanical test results exhibited that the recovery rate was better improved in the case of the modified resin infiltration approach in laminate composites dispersed with nanoparticles. It was attributed to their more enhanced strengthening mechanisms under effective interaction in mixed interface of fiber-matrix-MWCNTs, mainly attributing to bridge connection and stronger interfacial adhesion properties.
1 citations
TL;DR: In this paper , the authors present a glimpse of results to understand the fatigue damage progression in structural materials; infrared thermography was used to understand fatigue damage in copper, while X-ray computed tomography is used to study damage progression of carbon fiber reinforced plastic laminate.
Abstract: Fatigue failure is catastrophic once the material reaches the critical damage, but the damage accumulation is, in general, gradual. Several methods are used to study the fatigue damage progression, such as: microstructural investigation, stiffness degradation measurements, and loss of ductility etc. to predict the remaining life of dynamically loaded components. Non-destructive test methods such as ultrasonic, eddy current and infrared thermography are the other techniques that are used to sense the change in material response due to fatigue loading. This paper presents a glimpse of results to understand the fatigue damage progression in structural materials; infrared thermography is used to understand fatigue damage in copper, while X-ray computed tomography is used to study damage progression in an impact damaged carbon fiber reinforced plastic laminate. The damage volume is measured based on CT images and correlated with stiffness drop. Based on the study, it was observed that the use of multiple sensors and measurement techniques in tandem with other conventional experimental methods provides an insight into damage progression.