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ISO 6312-2010 pdf free download
ISO 6312-2010 pdf free download.Road vehicles — Brake linings — Shear test procedure for disc brake pad and drum brake shoe assemblies
Véhicules routiers — Garnitures de freins — Méthode d’essai de cisaillement des ensembles de plaquettes de freins a disque et segments de freins a tambour.
5 Sampling and conditioning
This procedure can also apply for samples during product development, on finished products. or after special treatment (such as that covered by ISO 6314) or usage (inertia-dynamometer testing or field use) with the appropriate preparation.
Perform the testing on a complete assembly or a section (coupon) of the assembly. When testing a section or coupon, apply the load In the radial or tangential direction relative to the vehicle mounting position. Indicate the test orientation on the test report.
If needed, prepare the sample edges to ensure good contact with the loading and fixed tools. Remove noise insulating shims before the test.
When testing a lined shoe, the test area may cover the full assembly or segments of an assembly confined by saw cutting down to the carrier (see Figure 1).
Use five samples for standard testing.
NOTE The test procedure applies a load in a direction that might not be In accordance with the loading direction of the product in service. A high aspect ratio, chamfered, or slotted pads might influence the shear behaviour of the pad assembly.
6 Test rig and fixtures
6.1 Test rig
The test rig shall be a compression or tensile testing machine or similar (shear testing) machine of sufficient capacity to apply the shearing load by activating a ram.
The test rig shall provide equipment to register the exact load applied at the instant of shear failure.
The load application rate shall be controlled in such a way that the load increases at an average rate of (4 500 ± 1 000) N/s (as determined from typical vehicle-based evaluation). If a constant crosshead speed machine is being used, the load rate shall be set to (10 ± 1) mm/mm. Indicate on the test report the type of machine control (load rate or crosshead speed) used for the test, so that it allows comparisons of results between different test rigs. Avoid any shock loading during the test.ISO 6312-2010 pdf free download.
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