ASTM_F_330_-_10.pdf

Designation:F33010Standard Test Method forBird Impact Testing of Aerospace Transparent Enclosures1This standard is issued under the fixed designation F330;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers conducting bird impact testsunder a standard set of conditions by firing a packaged bird ata stationary transparency mounted in a support structure.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardstatements,see Section 8.2.Terminology2.1 Definitions:2.1.1 birdthe carcass that is used to impact the test article.2.1.2 bird packagethe bird and container that encases thebird to prevent disintegration enroute to target.2.1.3 gunthe device that propels the bird toward thetarget.2.1.4 sabotthe container that is used to carry the birdpackage down the gun barrel.2.1.5 stripperthe device that stops the sabot at the end ofthe gun barrel so that only the bird package impacts the testarticle.2.1.6 test articlethe transparency and supporting struc-ture.3.Summary of Test Method3.1 This test method employs a smooth-bore bird gun thatfires a chicken carcass so that it impacts a stationary aerospacetransparency mounted in a supporting structure.3.2 The specific parameters described by this test methodare:3.2.1 Bird weight and condition,3.2.2 Bird velocity,and3.2.3 Instrumentation.4.Significance and Use4.1 This test method may be used for:bird impact testing ofaircraft crew compartment transparencies and supporting struc-ture to verify the design;compilation of test data for use inverification of future transparency and supporting structuredesign and analytical methods;and comparative evaluation ofmaterials.5.Apparatus5.1 Gun,compressed gas,conforming in principle to Fig.1,comprising:5.1.1 Pressure Tank,of capacity and working pressure asdiscussed in Note 1.NOTE1A gun capable of propelling a 4-lb(1.81-kg)bird in excess of650 knots(334 m/s)has a barrel 60 ft(18.3 m)long,bore of 6 in.(153mm),and a pressure tank volume of 30 ft3(0.849 m3)with an allowableworking pressure of 250 psi(1.725 106Pa).5.1.2 Release Mechanism,comprised of a firing solenoid,diaphragm,and a cutter.Upon initiation of the firing sequence,the release mechanism allows the compressed gas stored in thepressure tank to flow rapidly into the gun barrel and propel theprojectile.NOTE2The most common designs normally use either one or twodiaphragms in the release mechanism.In the single diaphragm design,thediaphragm is mechanically ruptured upon firing(see Fig.1).In the dualdiaphragm system,pressurized gas between the two pressurized gasdiaphragms is bled to initiate firing by allowing the stored gas to bursteach diaphragm in rapid succession.5.1.3 Barrel(Launch Tube),a smooth bore tube that guidesthe packaged bird(and sabot if used)during its acceleration bythe expanding air from the pressure tank.The bore and lengthof the barrel is chosen both to accommodate the largest of theprojectiles to be used and for the overall performance require-ments of the gun.1This test method is under the jurisdiction of ASTM Committee F07 onAerospace and Aircraft and is the direct responsibility of Subcommittee F07.08 onTransparent Enclosures and Materials.Current edition approved May 1,2010.Published June 2010.Originallyapproved in 1979.Last previous edition approved in 2004 as F330 89(2004).DOI:10.1520/F0330-10.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.4 Sabot Stripper may be mounted at the end of thelauncher tube.The purpose of the sabot stripper is to arrest ordeflect the sabot,allowing only the packaged bird to impact thetest article.5.2 Velocity Measurement System:5.2.1 The essential features of the velocity measurementsystem are that it be accurate and repeatable,not be triggeredby small stray objects that may be traveling with the projectile,and not alter the flight path or damage the projectile.5.2.2 Preferred velocity measurement systems use timingstations,located between the gun barrel and the test specimen,which are triggered by the projectiles breakage of a mechanicallink“break wire”or through the interruption of a light beam.The velocity is then computed and averaged from the knowndista