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Bending, Buckling, and Vibration of Laminated Plates
Published in Robert M. Jones, Mechanics of Composite Materials, 2018
When other composite materials are considered, the effect of bending-extension coupling on the buckling load depends essentially on the orthotropic modulus ratio, E1/E2, as shown in Figure 5-27. There, the buckling load is normalized by the buckling load of a specially orthotropic square plate (B11 = 0). Values of G12/E2 and ν12 are fixed because they do not vary significantly and their influence on the buckling load is small compared to that of E1/E2. As the modulus ratio decreases from the graphite-epoxy value of 40, the influence of bending-extension coupling decreases slowly. As noted previously, the reduction in buckling load of a square two-layered graphite-epoxy plate from the specially orthotropic plate is about 65%. For a square boron-epoxy plate, the reduction is about 43%. From the design-analysis point of view, the specially orthotropic plate solution is too high by 183% for a graphite-epoxy plate and by 74% for an analogous boron-epoxy plate. Obviously, bending-extension coupling is extremely important when the plate has only two layers. However, the influence of coupling dies out quite rapidly as the number of layers increases. For example, the reduction in buckling load for a six-layered graphite-epoxy plate is only about 7% and about 5% for a boron-epoxy plate.
Laboratory development and evaluation of an oleylamine curing Epoxy Asphalt
Published in International Journal of Pavement Engineering, 2022
Fenglei Zhang, Lei Zhang, Xiaoxuan Guo, Dongliang Hu, Zhenyu Cai, Kai Huang
The dosage of the amine curing agent is determined according to Eqs. 1 and 2. The proportion of amine curing agents needs to be very accurate to ensure the complete curing of epoxy resin and meet the mechanical strength requirements. The amount of curing agent is related to the epoxy value of epoxy resin and the variety of amine curing agents. Where, is the relative molecular weight of amine curing agent;
Acrylic-based monocoat eco-friendly, anticorrosive coating for cathodic electrodeposition
Published in Surface Engineering, 2022
Shiv Charan Prajapati, Pramod Kumar Kamani
The epoxy value and amine values of the resins were determined by titration. The epoxy value is the number of moles of the epoxy group per 100 g of resin. The amine value is determined as the weight (in mg) of KOH required to neutralise 1 g of sample with protonated amine groups.