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ISO 8013-2012 pdf free download
ISO 8013-2012 pdf free download.Rubber, vulcanized — Determination of creep in compression or shear
Caoutchouc vulcanisé — Determination du fluage en compression ou en cisaillement.
the operating surfaces of the plates be lubricated. The plates shall be sufficiently rigid to withstand the force without bending and of sufficient size to ensure that the whole of the compressed test piece is within the area of the plates.
NOTE For most purposes, a silicone or fluorosilicone liquid having a kinematic viscosity of 0.01 m2ls at standard laboratory temperature is a suitable lubricant
One of the plates shall be rigidly mounted so that it does not move in any direction under the action of the compressive force. The other plate shall be able to move In a friction-free manner in one direction only, I.e. in a direction coincident with the axis of the test piece (see Figures 1 and 2).
The apparatus shall be capable of applying the full force with negligible overshoot and maintaining it constant to within 0,1 %. The mechanism for applying the force shall be such that the line of action of the applied force remains coincident with the axis of the test piece as it creeps.
Suitable equipment shall be connected to the compression device so that the deformation of the test piece can be determined, to an accuracy of ±0,1 % of the initial test piece thickness, at different times after the force has been fully applied.
Many types of apparatus have been used, with mechanical, electronic or optical measurement of deformation. Figure 2 shows a typical example using a micrometer dial gauge for the determination of creep in compression. The measuring device shall not exert a pressure of more than 22 kPa on the test piece before the test load is applied.
If the tests are carried out at an elevated temperature, the test piece and the flat plates of the compression device shall be inside a temperature-controlled chamber (see 4.4).
4.3 Shear device for measurements In shear
The apparatus shall be capable of measuring the shear deflection in the test piece due to the application of a constant shear force.
The apparatus shall be capable of applying the full force with negligible overshoot and maintaining It constant to within 0,1 %.
The force shall be applied either to the central metal plate, with the outer plates rigidly mounted. or to the outer metal plates with the central plate rigidly mounted. The line of action of the applied force shall be in the plane of the central plate, and pass through its centre in a direction perpendicular to the undeformed rubber test pieces. This line of action shall be maintained as the test piece creeps (see Figure 3).
The movement of the central plate relative to the outer plates shall be in a friction-free manner and only in the direction of the line of action of the applied force.
Suitable equipment shall be connected to the test piece so that relative movement of the central plate with respect to the outside plates can be determined with an accuracy of r 0,01 mm at different times after the force has been fully applied.ISO 8013-2012 pdf free download.
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