BS ISO 11839:2010 pdf free download Machinery for forestry — Glazing and panel materials used in operator enclosures for protection against thrown sawteeth — Test method and performance criteria
1 Scope
This International Standard specifies test procedures and performance requirements for determining theprotective ability of panel materials used in forestry-machinery operator enclosures intended to protect theoperator against sawteeth thrown by circular-saw components. This particular type of hazard is specificallydefined by the size and velocity of the sawteeth and is unique to these cutting devices.
This International Standard is applicable to panel materials for forestry machines defined in lSO 6814 thatinclude an integrated or attached circular sawing device,controlled or powered by the primary machine(e.g. topping saws, felling saws or bucking saws).
lt does not address protection from chain-shot hazards (see ISO 11837).
2Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences,only the edition cited applies. For undated references,the latest edition of the referenceddocument (including any amendments) applies.
ISO 6814,Machinery for forestry — Mobile and self-propelled machinery – Terms,definitions andclassification
3Tests
3.1Test equipment
3.1.1 Projectile launcher, capable of propelling the specified test projectiles at the required velocities. Thelauncher shall have a controllable means of adjusting ‘velocity. The launcher shall also have a means oforienting and directing the test projectile in relatively linear motion with the cutting surface towards the target.The test projectile may be supported in the launcher by a test projectile holder(i.e. a sabot).Such a testprojectile holder should be less than 10 % of the mass of the tooth projectile being propelled, and any impactof the holder on the test panel shall be clearly inconsequential to the test result (see Figure 1).
3.1.2Test projectile (F1), consisting of a representative four-pointed sawtooth,300 g ± 5 g, with a cuttingsurface 50 mm t 1 mm square (see Figure 2).
3.1.3Test projectile (F2), consisting of a representative, four-pointed sawtooth, 800 g ± 5 g, with a cuttingsurface 60 mm ± 1 mm square (see Figure 2).
3.1.4 Target panel opening,consisting of a rigid steel frame surrounding a square opening of450 mm ± 1 mm × 450 mm ± 1 mm.
3.1.5 Corrugated cardboard indicator panel,500 mm × 500 mm,positioned 250 mm ± 5mm direclybehind the target panel opening.
3.1.6 Target support structure that rigidly positions the target assembly perpendicular to the line of motionof the test projectile,with the target surface 3 000 mm ± 50 mm from the muzzle of the launcher.
3.1.7 Means of measuring test projectile velocity to an accuracy of ± 2 m/s.
3.1.8 Means of measuring panel surface temperature to an accuracy of ± 1 ℃.
3.1.9 Containment structure surrounding the test projectile line of motion, target assembly and indicatorpanel to provide suitable protection for test personnel.
3.2Test samples and mounting
3.2.1 Test samples shall be representative of the commercial specification of the given product material.Appropriate material properties shall be determined and reported to verify test conditions.
3.2.2 Test samples shall be mounted onto the target panel opening using the manufacturer’s specifiedattachment methods. The exception to this are test samples from materials that are typically attached usingpermanent methods such as welding; these may be attached to a separate frame that is then bolted to thetarget panel opening. Mounting details shall be recorded and reported.
3.3Test method
3.3.1 Five samples shall be tested at low temperature and five samples at room temperature.Each sampleshall be impacted once. The low-temperature samples shall be conditioned for 3 h prior to testing with theimpact side exposed to -32 C± 3 °C, and the operator side shall be exposed to a room temperature of+22 C±3°℃.The room temperature samples shall be conditioned for 3 h at +22 °C±3 ℃.
3.3.2 Five samples of non-metallic materials shall also be high-temperature-tested at +49°C± 3 °℃.Samples shall be conditioned at the elevated temperature for a minimum of 3 h prior to testing.
3.3.3 Each material shall be tested at the appropriate energy level, namely either
– 1 084 J to 1 311 J for F1, or
– 4 840 J to 5 856 J for F2.
The selection of the energy level shall be based on consideration of the type of thrown sawteeth hazard thematerial will face, in accordance with Annex B.
3.3.4 The F1 test projectile shall impact the target at a velocity of 85 m/s to 94 m/s. The F2 test projectileshall impact the target at a velocity of 110 m/s to 121 m/s.
3.3.5lf the velocity of the test projectile is less than the minimum specified velocity and the sample does notfail, the test shall be repeated. If the velocity of the test projectile is less than the minimum velocity and thesample fails, the test result (failure) is accepted. If the velocity of the test projectile is more than the maximumvelocity, and the test sample passes, the test result (pass) is considered acceptable.
3.3.6The test projectile shall impact the panel with the cutting surface forward in at least three of thesample impacts and within the target opening.