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The foil or cartridge paper surface shall be placed toward the window glazing. The testing agency selects the explosive and test dimensions to yield a high-explosive blast having the required classification criteria for the site conditions.
A higher sampling rate is recommended for the satchel tests. When the test specimens have been mounted on test frames and the high explosives has been placed and is ready to be armed, the area shall be cleared of all non-essential personnel. For dated references, only the edition cited applies. Nominal charge size and nominal standoff distances capable of giving the required peak pressure and impulse values under certain conditions are included in Clause C.
The preliminary selection of an appropriate explosive and mass may be made by reference to Table B. In order to aid data collection, this definition is quantified in Table D.
It shall be determined and noted whether or not any breakage or rupture of the inside surface has occurred. P-t curves at locations subject to blast clearing, on small targets or near the edges of targets, have a reduced impulse and do not follow the shape of an idealized Friedlander curve.
Test and classification for arena air-blast loading Status: Search all products by. When automated numerical- calculation procedures are used, this time is the same as that of the peak of the impulse-time curve denoting the measured test value, 7 t.
The rating is specific only to those blast conditions.
Contact us at the following address. Fragments that shall be considered in rating the glazing or 1633 system include those generated by the glazing and any other parts of the glazing system not considered to be part of the test facility.
F High hazard Glazing is observed to fracture and there are more than 10 rateable perforations in the area of the vertical witness panel higher than 0,5 m above the floor, or there are one or more perforations 1693 the same witness panel area with fragment penetration more than 12 ieo. NOTE The clamping pressure can have 1633 significant effect on the test results.
Classification and ratings are assigned based on the performance of glazing loaded by air-blast pressures and impulses and are specific to the blast characteristics under which the test takes place. The free-air equivalent mass of a particular explosive is the mass of the standard explosive TNT required to produce a selected 1693 parameter of magnitude equal to that produced by a unit mass of the explosive in question.
If the reaction structure is oriented perpendicular to the uso of the detonation point, the face of the reaction structure should not be less than 2,4 m wide x 2,4 m high. Ethiopian Standards are approved by the National Standardization Council and are kept under continuous review after publication and updated regularly to take account of latest scientific and technological changes. No part of these publications may be reproduced in any form without the prior permission in writing of ESA.
For further information on assessing the blast relative to the size of the reaction io, tests, criteria and effects on glazing, see Reference .
Proof sent to secretariat or FDIS ballot initiated: Mean peak air-blast pressure and mean positive phase impulse values computed from recordings by the air-blast transducers mounted as defined in 6. However, different orientations, charge masses and test-frame sizes are permissible, provided that the test specimen experiences the required blast values normal to the specimen surface. Glazing dust, slivers and all other smaller particles are not accounted as fragments.
Parts be projected any distance from the attack face towards the blast source. The location and description of all parts of the specimen shall be recorded, whether retained in the frame or fallen inside or outside, with identification of inner and outer leaves of glass where appropriate.
Final text received or FDIS registered for formal approval. Approximate free-air equivalence factors, k pk x and k, for common military explosives are given in Table B. The fragment severity is determined based upon the number, size, effects and location iwo fragments that lie at, or behind, the original location observed during 169333 data gathering.
Also, there are no more than three rateable perforations or indents anywhere in 169333 witness panel and any fragments on the floor between 1 m and 3 m from the interior face of the specimen have a sum total united dimension of mm or less. For classification purposes, glazing shall be mounted in the frame defined in 6.
Where a transducer panel is used, this is simply the “mean” or the “average” of the adjusted peak pressures recorded by at least three transducers near the simulated centre of the target. One additional specimen shall be provided for pre-test measurements.
A number shall be assigned to each test specimen and lso be marked accordingly. Bullet resistant security glazing. The first is intended for ieo with glazing designed to protect against vehicle bombs and is based on kg TNT trinitrotoluene equivalent blasts.
Outer leaves from the attack face may be sacrificed and may fall or be projected out. Search the history of over billion web pages on the Internet.
The peak pressure, P maxof relevance is the resulting smoothed value. Accept and continue Learn more about the cookies we use and how to change your settings. Establish the value of the resulting measured peak pressure, P maxby recording the pressure value from the point at which the mean pressure-time trace crosses the time-of-arrival axis.
Customers who bought this product also bought ISO All pressure transducers shall be capable of defining the anticipated air-blast pressure history within the linear range of the transducer. The 12 kg and 20 kg charges were placed at a height of 0,8 m to centre above a hard surface. The board shall be in one or two layers of combined thickness at least 35 mm, mounted in a frame capable of remaining in place even if forcibly impacted by failed pieces of the test specimen.
Mean peak air-blast pressure and mean positive-phase impulse values, computed from recordings by the air-blast transducers mounted as defined in 6.
Measurements and records shall be made of the bolts, screws or other devices used for fixing the test frame sio other glazing support system to the reaction structure. The equivalent mass of that explosive equals the mass of TNT divided by average k factor.
The decision to use a blast mat, its size and thickness shall be at the discretion of the test director.