Abstract

The mechanical behavior of filled elastomeric (rubber and rubber-like) materials is known to beincompressible, or nearly-incompressible, hyperelastic and time-dependent, or viscoelastic. Thiscomplex behavior of rubbery materials needs more understanding, and good knowledge is required forsuch behavior in order to achieve a good constitutive modeling for better design of a rubber componentfor a specific application. This work concentrated on studying the effect of carbon black type on themechanical properties of rubbery material characterization. To do this, different tests were performedon filled rubber with three different kinds of carbon black N326, N375, and N660. All tests wereperformed at room temperature. The tests include rheometer tests, hardness tests, tensile tests, specificgravity tests, compression tests, relaxation test, and cyclic loading tests. Tensile tests were done withdifferent strain rate, relaxation tests done under different mean strain.Tensile stress-stretch curves were generated from the test data at strain rate ranging from 10 to 500mm/min and several transitions associated with strain-induced crystallization were observed in allmaterials. The filled rubber became stiffer when the strain rate increased from 10-200 mm/min, andbecame more compliant when the strain rate increased from 200 to 500 mm/min.Hardness and specific gravity tests showed that rubber filled with carbon black N375 is harder andhas specific density more than other two types of filled rubber.The mechanical compression set tests, which performed on rubber with three kinds of carbon blackand found that compression set for rubber filled with carbon black N375 is more than the other twokinds of filled rubber.Relaxation stress-time curves were generated from test data at varying mean strain ranging (50% to200%) from the effective length of the specimen, at constant strain rate (200 mm/min). Generally, itwas observed that the stress reduces with time when the specimen hold at specific strain. This reductionis faster at strain between 50% and 100% than the strain between 150 to 200% till reaches steady state.Series of cyclic tension tests were carried out at room temperature on a rubber compound understrain rate 200 mm/min. All these cyclic strain-controlled experiments showed that the filled rubbermaterials, used in the present work are time-dependence with hysteresis. It came out that hysteresis forrubber with carbon black N375 is more than the rubber with other two kinds of carbon black

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The article was added to IASJ on 2013-12-16

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