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Testing adhesion of cord or wire in rubber

机译:测试橡胶线或电线在橡胶中的附着力

摘要

A novel method and mold apparatus for testing adhesion of cord or wire in rubber which measures "intrinsic" adhesion, i.e. adhesive strength independently of the tearing strength and stiffness of the rubber matrix. Each test specimen is formed of two uncured preformed or premolded blocks, called coupons, in respective preform molds. Two wire segments are inserted coaxially between the coupons in preformed grooves and the assembly is molded and cured. The proximate ends of the segments are buried in or embedded within the body of the specimen, but spaced apart along the axis of the wire segments and the body of the test specimen. The specimen is stressed only by the wire segments. In an Instron or like test machine, the free ends of the wire segments are pulled at a selected rate to failure. Failure of the adhesion is observed to start at the embedded end of the wire segment and progress outwardly along the segment which is pulled from the body or matrix. The force required is recorded and the maximum observed force, together with the otherwise determined rubber stiffness, provides a measure of the intrinsic face-to-face adhesion of the particular wire to the particular rubber. A preferred mold apparatus provides mold plates useful both in preforming the coupons and in mold curing the specimens.
机译:一种新颖的方法和模具设备,用于测试橡胶中的电线或电线的粘合力,该方法和模制设备测量“本征”粘合力,即粘合强度与橡胶基体的撕裂强度和刚度无关。每个试样由两个未固化的预成型或预成型块(称为样板)在各自的预成型模具中形成。将两个线段同轴地插入在预制槽中的试样夹之间,并对组件进行模制和固化。线段的近端埋在或嵌入样品主体内,但沿导线段的轴线和测试样品的主体间隔开。样品仅受到线段的应力。在Instron或类似的测试机中,以选定的速率拉动线段的自由端以使其失效。观察到粘合失败始于导线段的嵌入端,并沿着从主体或基体拉出的段向外发展。记录所需的力,并且最大观察到的力以及另外确定的橡胶刚度,提供了特定金属丝与特定橡胶之间固有的面对面粘附力的量度。优选的模具设备提供可用于预成型试样和模具固化样品的模具板。

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