BS ISO 1922:2018 pdf free

BS ISO 1922:2018 pdf free.Rigid cellular plastics一Determination of shear properties
A test machine capable of applying a sufficient force within the maximum displacement experienced in the shear test.
It shall be capable of operating at a constant rate of movement of the movable head of (1±0,5) mm/min in a direction parallel to the longitudinal axis of the test specimen assembly.
The test machine shall exert longitudinal shear forces through parallel plates bonded to a single test specimen of dimensions as in 6.2. The parallel plates shall be rigid with one plate attached to the fixed parts and the other to the movable parts of the test machine.
The test machine shall exert longitudinal shear forces through parallel plates bonded to a double test specimen of dimensions as in 6.3. The parallel plates shall be rigid with the outer plates attached to the fixed parts and the central plate to the movable parts of the test machine.
Two flat rigid specimen supports with a length 330 mm, a width of 50 mm and a thickness of(16±1) mm shall be attached to the grips of the test machine via an adaptor and universal joint.
The procedure of attaching the specimen supports to the grips is shown in Figure 1. The thickness of the adaptors that connect the specimen supports to the test machine grips shall be the same as the thickness of the test specimen.
NOTE Flat, rectangular-sectioned mild steel plates with a thickness of 16 mm have proved to be suitable for the support material.
Three flat rigid specimen supports with a length of 330 mm, a width of 50 mm and a thickness of (16±1) mm shall be attached to the grips of the test machine via an adaptor and universal joint.
NOTE The essential features are three flat rigid supports of which two can be maintained with their planes parallel and vertical. A suitable arrangement is shown in Figure 2.
Experience gained using both the single and double test specimen procedures with several products indicated that it is of paramount importance that the specimen supports are very rigid. With the double test specimen arrangement, the fixed support should be maintained in parallel vertical plates, the arrangements shown in Figure 2 have proved suitable.BS ISO 1922 pdf free download.