Testing cord-to-elastomer adhesion
AssigneeThe Goodyear Tire & Rubber Company
InventorKenneth K. Klar
Life of this patent
Estimating the term…
Abstract
The adhesion of cord or wire to the elastomer, rubber, or rubbery material is measured by exerting forces or loads collinear with the cords or wires such that one of the cords or wires is pulled from between a pair of cords. The three cords are embedded in a predetermined length of the elastomer. In a static test the opposing forces are exerted at a predetermined rate. In a dynamic test the opposing forces oscillate at predetermined frequency. Fixtures adapting an MTS high-speed oscillating tester are provided. The foregoing abstract is not to be taken as limiting the invention of this application, and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to the accompanying drawing and the following detailed description.
Claims8
A method of testing a cord-to-rubber adhesion comprising selecting a specimen of cords embedded in a rubber matrix, said specimen having three parallel cords, applying a force longitudinally of the first cord in a first direction and applying a force to each cord of the pair thereof having the first cord therebetween in a second direction, and measuring the force required to cause separation between said first cord and said pair thereof.
A method of testing a cord-to-rubber adhesion comprising providing a test specimen of cord ply having a matrix of rubber and a plurality of side-by-side parallel cords embedded therein, establishing a test zone of predetermined length parallel to said cords and extending transversely thereof intermediate the ends of the specimen, slitting said matrix between cords of each adjacent pair thereof outwardly from said zone to the respective ends of the specimen, gripping a first cord near one end of the specimen in a first clamp gripping each cord of the pair thereof having the first cord therebetween in a second clamp near the other end of the specimen, moving one of said clamps and the cord or cords gripped therein relatively of the other thereof in a direction parallel to said cords, and measuring the force exerted by said clamps to pull said first cord from between said pair thereof.
Apparatus for testing cord-to-rubber adhesion comprising means for exerting linear oscillation on a test specimen including a pair of rams arranged in opposing collinear alignment one being a fixed ram having a load cell and the other being a ram for effecting oscillation of a predetermined frequency and amplitude, a chamber disposed about said rams for controlling the test environment, a pair of fixtures each having a pair of clamp jaws and means for adjustably spacing said jaws relatively of one another, one of said fixtures being associated with the fixed ram the other of said fixtures being associated with the oscillating ram, one pair of said jaws being engageable to clamp opposite ends of a selected one of a plurality of parallel cords the other pair of jaws being engageable to clamp opposite ends of a pair of said cords having the selected cord therebetween.
Dependencies are inferred from the claim text.