A rectangular test piece of coated fabric is sewn into a cylindrical shape. The cylinder of coated fabric is mounted between two discs and secured into position. One of the discs oscillates and its axis through approximately 90°. This includes twisting in the coated-fabric test piece cylinder. At the same time, the other disc reciprocates along its axis, thus causing the cylindrical test piece to compress along its length. This twisting and simultaneous compressing of the cylindrical test piece is continued for either a pre-set number of cycles or until damage to the test piece is apparent.