ISO 1922 pdf download

ISO 1922 pdf download.Rigid cellular plastics — Determination of shear strength 1 Scope This International Standard specifies a method of determining the shear strength of rigid cellular plastics. It also provides for the optional determination of shear modulus. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 291 :1 997, Plastics — Standardatmospheres forconditioning andtesting. ISO 1 923:1 981 , Cellularplastics andrubbers — Determination oflineardimensions. 3 Principle A shear stress is applied to a test specimen of defined shape by means of metal supports bonded to the specimen. 4 Apparatus 4.1 Test machine The test machine (see Figure 1 ) shall be such that: a) a test specimen having the form and dimensions specified in clause 5 is held vertically between two fixing devices each comprising a metal support, one of these devices being fixed and the other movable, and the stress being transmitted along the longitudinal axis of the specimen; b) the movable grip will be moved away from the fixed grip at a constant rate of (1 + 0,5) mm per minute in a direction parallel to the longitudinal axis of the specimen; c) the force exerted on the specimen shall be known with a maximum error of 1 %, and the distance between the grips shall be known with a maximum error of 0,01 mm, by means of recording devices. 4.2 Metal supports These shall consist of flat, rectangular-sectioned, mild-steel plates, machined on one side, with a thickness of (1 6 + 1 ) mm and a width of 1 0 50 + mm. The thickness of the adaptors that connect the metal supports to the test machine grips shall be equal to the thickness of the test specimen. 4.3 Adhesive The adhesive used to fix the metal supports to the test specimen shall be such that the shear strength and modulus of the adhesive film are significantly greater than that of the cellular material under...