Material Characterization for Reliable Resin Transfer Molding Process Simulation

Falaschetti, Maria Pia; Rondina, Francesco; Zavatta, Nicola; Gragnani, L.; Gironi, Martina; Troiani, Enrico; Donati, Lorenzo

doi:10.3390/app10051814

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…Therefore, thermal ageing caused by exposure to such temperatures can become a major issue over the component’s lifetime. Accurate assessment of the mechanical properties of the material aged under these conditions is of paramount importance for the design of composite structures [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Ageing on the Mechanical Strength of Carbon Fibre Reinforced Epoxy Composites

et al. 2021

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Applications of Carbon Fibre Reinforced Polymers (CFRP) at temperatures over 150–200 °C are becoming common in aerospace and automotive applications. Exposure of CFRP to these temperatures can lead to permanent changes in their mechanical properties. In this work, we investigated the effect of thermal ageing in air on the strength of carbon fabric/epoxy composites. To this end, accelerated artificial ageing at different temperatures was performed on carbon fabric/epoxy specimens. The flexural and interlaminar shear strengths of the aged specimens were assessed by three-point bending and short beam shear tests, respectively, and compared to those of unaged samples. For ageing at temperatures below the glass transition temperature of the resin, Tg, a moderate reduction of strength was found, with a maximum decrease of 25% for 2160 h at 75% Tg. On the other hand, a rapid strength decrease was observed for ageing temperatures above Tg. This was attributed to degradation of the epoxy matrix and of the fibre/epoxy interface. In particular, a 30% strength decrease was found for less than 6 h at 145% Tg. Therefore, it was concluded that even a short exposure to operating temperatures above Tg could substantially impair the load-carrying capability of CFRP components.

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Section: Introductionmentioning

confidence: 99%

Effect of Thermal Ageing on the Mechanical Strength of Carbon Fibre Reinforced Epoxy Composites

et al. 2021

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“…This process was chosen because it allows to have desired volume fractions, and is easy to handle and also used in several industrial sectors. 33 Before shaping the luffa mat, they were placed in a 100-ton thermo-compression machine and then pressed for 90 minutes at a temperature of 40°C, in order to reduce the thickness of the laminate and to have a uniform surface.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Characterization of low-velocity impact and post-impact damage of luffa mat composite using acoustic emission and digital image correlation

Grabi

Chellil

Habibi

et al. 2022

Journal of Composite Materials

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In this paper, low-velocity impact and compression after impact damage tolerance of composite reinforced with natural luffa mat were studied for the first time. The effect of impact energy and the influence of the damaged area on the residual mechanical properties under compression were investigated. Acoustic emission (AE), digital image correlation (DIC) and scanning electron microscopy (SEM) were used for the evolution of different damage modes and displacement fields. The findings of the experiments reveal that compression after impact tests of 1, 2, and 3J show a significant effect of the residual damage which decreases residual compressive strength by 12.61, 24.14, and 30.9%, respectively, compared to the unimpacted composite, but Young’s modulus was not significantly affected. Multivariable statistical analysis of the AE signals identified four classes of damage: matrix cracking, fiber-matrix debonding, delamination, and fiber failure. It also showed that the damage mode of unimpacted composites which presents the majority of the amplitude events of the AE signals is mainly due to fiber failure, by contrast, for impacted composites the damage mode is mainly due to fiber-matrix debonding. The AE results are convincing and they were confirmed by SEM images of the fractured faces of the specimens, which revealed the main causes of material failure during the compression after impact test. The DIC system monitored the effect of pre-existing damage under compressive loading and found that increasing impact energy increases the stress concentration around the impacted area and has a significant effect on residual crack development, much more in the loading direction.

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“…Fiber takviyeli plastikler (FRP), sert cam fiber takviye ve sünek polimer matristen oluşan kompozit malzeme türleridir (Santa et al 2016). FRP'ler uzay, havacılık, enerji, otomotiv ve birçok alanda sunduğu avantajlar ile ön plana çıkmaktadır (Falaschetti et al 2020). FRP'ler sağladıkları; hafiflik, üstün mekanik özellikler, korozyon özellikleri ve tasarım özgürlüğü ile diğer malzeme türlerine karşı büyük avantaj sunmaktadır.…”

Section: Introductionunclassified

The Effect of Gelcoat and Lamination Plan on Mechanical Properties of the Final Product in RTM Method

TOPBAŞOĞLU

Kaboglu

KELEŞ

2023

Afyon Kocatepe University Journal of Sciences and Engineering

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Bu çalışmada, Reçine Transfer Kalıplama (RTM) yöntemiyle üretilmiş cam fiber takviyeli kompozit plakalarda elyaf ağırlığının ve jelkotun mekanik özelliklere etkisi incelenmiştir. Üç farklı laminasyon planı ve bu planların jelkotlu halleri kullanılmıştır. Numunelerin incelenmesi için çekme testi, üç nokta eğme testi ve Barcol sertlik testleri yapılmıştır. Laminasyon planlarında 300 g/m2, 450 g/m2, 600 g/m2 olmak üzere 3 farklı ağırlıkta elyaf kullanılmıştır. Ayrıca laminasyon arasında 180 g/m2 ve 250 g/m2 polipropilen köpük malzeme kullanılmıştır. Her laminasyon için bir jelkotlu, bir jelkotsuz plaka üretilmiştir. Üretim sonunda kalınlıkları 2.5 – 3.2 mm arasında değişen 6 plaka üretilmiştir. Üç nokta eğme ve çekme testi için 10’ar numune kesilmiştir, Barcol sertlik testi plaka üzerinde 5 noktadan alınmıştır. Testler sonucunda elyaf ağırlığının artmasıyla mukavemet değerlerinin arttığı, uzama değerlerinin azaldığı gözlemlenmiştir. Her laminasyonun jelkotlu hallerinde %5 - 15 aralığında mekanik özellik düşüşü gözlemlenmiştir.

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Material Characterization for Reliable Resin Transfer Molding Process Simulation

Cited by 7 publications

References 26 publications

Effect of Thermal Ageing on the Mechanical Strength of Carbon Fibre Reinforced Epoxy Composites

Effect of Thermal Ageing on the Mechanical Strength of Carbon Fibre Reinforced Epoxy Composites

Characterization of low-velocity impact and post-impact damage of luffa mat composite using acoustic emission and digital image correlation

The Effect of Gelcoat and Lamination Plan on Mechanical Properties of the Final Product in RTM Method

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