Structural, physical and mechanical properties of carbon fibre‐reinforced composites of diglycidyl ether of bisphenol‐A and bisphenol‐C

Soni, Hitesh K.; Patel, Ranjan G.; Patel, V. S.

doi:10.1002/apmc.1993.052110101

Cited by 4 publications

(1 citation statement)

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“…In load-bearing applications, it is the fibre-dominated properties which dictate the response of the AFRC to applied stress and temperature. However, the matrix-dominated properties such as interlaminar shear strength [1,2], resin failure strain [3], void content [4], crosslink density [5], etc can influence damage development and progression in the composite. Factors which can influence the properties of the matrix include: (i) chemical composition and stoichiometry of the reagents, for example relative amine and epoxy concentration; (ii) cure schedule used to process the resin; and (iii) the absorbed moisture content as a function of repeated freeze-thaw cycles for materials such as pre-pregs.…”

Section: Introductionmentioning

confidence: 99%

In situcure monitoring of epoxy resins using optical fibre sensors

Crosby

Powell

Fernando

et al. 1996

Smart Mater. Struct.

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This paper describes a comparative study of in situ cure monitoring by three methods: (i) evanescent wave spectroscopy; (ii) refractive index change; and (iii) near-infrared spectroscopy.The cure characteristics of an epoxy/amine reaction were followed in real-time during the crosslinking reaction via the above-mentioned techniques. The evanescent wave spectroscopy technique was based on monitoring the characteristic infrared absorption bands of the resin system to compute the concentration of the amine hardener as a function of cure time. Good correlation was obtained between the evanescent wave spectroscopy data and a conventional method of studying cure reactions, i.e. infrared spectroscopy.During the cure reaction, the refractive index of the resin system increases as a function of the crosslink density. This increase in the refractive index was monitored using two optical fibre techniques. In the first case, a declad region of the optical fibre was immersed in the resin system and in the second method an optical fibre reflectometer was used to track the changes in the refractive index. Once again, good correlation was obtained between the optical fibre techniques and infrared spectroscopy cure data. The results obtained from the optical fibre sensor experiments were used to model the cure kinetics of the resin system. The cure kinetic models were found to predict the cure reaction up to approximately 60% of the reaction.

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