Determination of the ranges of the optimal content of a dispersed filler in epoxy composites
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DETERMINATION OF THE RANGES OF THE OPTIMAL CONTENT OF A DISPERSED FILLER IN EPOXY COMPOSITES I. H. Dobrotvor,1 P. D. Stukhlyak,1 and A. V. Buketov1, 2
UDC 667.64:678.026
Criteria based on the determination of the filler content in epoxy composites with increased operating indices are formulated. Taking into account each criterion, we determine ranges of the optimal and less appropriate filler contents in composites. Keywords: composite material, residual stresses, adhesion strength, dispersed filler.
One of the methods for checking the adequacy of selected criteria for the formation of a mathematical model of properties of an investigated object during planning an experiment is an analysis of the correlation between outlets of the model. It was established that the dependence of the adhesion strength of composite materials (CMs) on the contents of fillers correlates with an analogous dependence of residual stresses [1]. Here, residual stresses are the result of physical and chemical interactions on the interface filler–binder, which, in turn, determines the cohesion strength of the materials. Analyzing ratios of residual stresses to the adhesion strength of a CM, one can determine the optimal content of dispersed fillers in a binder for the formation of materials with increased operating characteristics. If the absolute values of residual stresses are larger than the absolute values of the adhesion strength of composites by 6–8%, it is considered that these materials are nondurable due to self-exfoliation in operation [1, 2]. Moreover, an analysis of the criterion of change in the adhesion strength with respect to residual stresses in materials with increase in the content of dispersed fillers in the binder is of importance. Using these criteria in the aggregate, one can obtain a model that accounts for the input and output factors and that allows him to determine the ranges of the optimal content of dispersed fillers in CMs with improved properties and ranges of the content of particles in composites with low physicomechanical characteristics. The aim of the investigation is to determine the optimal content of a dispersed filler in composite materials on the basis of an analysis of criteria that take into account the relation between the adhesion strength and residual stresses. Materials and Technique We investigated ED-20 epoxy oligomer (GS 10587-84). As a curing agent, polyethylenepolyamine (TU 6-05-241-202-78) was used, and as fillers in the formation of CMs, we used powders of electrocorundum (TU 6-09-426-75), 1500 N3 ferrite, copper oxide, chromium oxide (GS 2912-79), brown slime, 400 cement, and silicon and boron carbides with a particle size of 63 μm, which were introduced in the different amounts, namely 10, 20, 40, 60, and 80 m.p. (here and in what follows, the filler contents are presented in m.p. per 100 m.p. of the binder). 1 2
Pulyui Ternopil State Technical University, Ternopil, Ukraine. Corresponding author; e-mail: [email protected].
Translated from Fizyko-Khimichna Mekhanika Materiali
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