ASTM F3324-2018 Standard Test Method for Measurement of Cut Resistance to Chainsaw in Leg-Protective Devices.pdf

1、Designation: F3324 18Standard Test Method forMeasurement of Cut Resistance to Chainsaw in Leg-Protective Devices1This standard is issued under the fixed designation F3324; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of

2、 last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method measures cut resistance of garmentsand devices worn to protect the lower body (legs) whenoperating a

3、 chainsaw.21.2 This test method may be used to test for compliance tominimum performance requirements in established safety stan-dards.1.3 The values stated in SI units are to be regarded asstandard.NOTE 1The values stated in each system may not be exact equiva-lents; therefore, each system must be

4、used independently of the other,without combining values in any way.1.4 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, health, and environmental practices and

5、 deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-m

6、endations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3D123 Terminology Relating to TextilesD1056 Specification for Flexible Cellular MaterialsSponge or Expanded RubberD1776/D1776M Practice for Conditioning and Testing T

7、ex-tilesF1494 Terminology Relating to Protective Clothing2.2 Military Standard:4MIL-STD-105 Sampling Procedures and Tables for Inspec-tion by Attributes2.3 Federal Standard:4FS 5100-86 Type II, Cloth, Duck, Nylon, PolyurethaneCoated3. Terminology3.1 Definitions:3.1.1 chainsaw, na portable, power-ope

8、rated tool used forcutting wood that has cutters linked in a chain.3.1.2 chain speed, nthe speed of synchronized movementof linked cutters around a guide bar and sprocket.3.1.3 chain stop, nthe resulting action when a materialclogs (jams) the drive sprocket or slows the speed sufficientlyto prevent

9、advancement of the saw chain.3.1.4 cut resistance, nin chainsaw testing, the ability of amaterial, while in contact with the linked cutters, to resistcut-through of the cutters of a moving saw chain independentof either jamming or chain stop.3.1.5 cut-through, nfor chainsaw cut resistance, the actio

10、nof a running chainsaw after complete breakthrough of either aprotective garment or protective device.3.1.5.1 DiscussionWhen a cut-through is effected, speedof the saw chain must be measured.3.1.6 jamming, nfor chainsaw cut resistance, the cloggingaction manifested by a protective garment or a devic

11、e that canproduce a chain stop.3.1.7 lower body, nthat part of the human body whichincludes all portions between the waist and feet, not to includethe feet.3.1.8 protective clothing, nan item of clothing that isspecifically designed and constructed for the intended purposeof isolating all or part of

12、 the body from a potential hazard, orisolating the external environment from contamination by theclothing.1This test method is under the jurisdiction ofASTM Committee F23 on PersonalProtective Clothing and Equipment and is the direct responsibility of SubcommitteeF23.20 on Physical.Current edition a

13、pproved Aug. 15, 2018. Published September 2018. Originallyapproved in 2018. DOI: 10.1520/F3324-18.2This standard was developed as a replacement for the archived CAN/BNQ1923-450.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org.

14、For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,Philadelphia, PA 19111-5094, http:/quicksearch.dla.mil.Copyright ASTM International, 100 Barr Harbor Drive, PO Bo

15、x C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by t

16、he World Trade Organization Technical Barriers to Trade (TBT) Committee.13.1.8.1 DiscussionFor chainsaw cut-resistant protectiveclothing, the potential hazard is exposure to a running powersaw chain.3.1.9 saw chain, na closed loop of cutters linked togetherfor use in a portable, power-operated tool.

17、3.1.10 threshold stopping speed, nchain speed that resultsin a14-in. cut in the bottom layer of the protective pad liner ina chainsaw leg-protective device.3.1.10.1 DiscussionThis value establishes the relationshipbetween the probability of cutting through the protectiveclothing (or foot-protective

18、device) and the speed of the sawchain. For lower chain speeds, the probability of cut-throughapproaches zero, while for higher chain speeds, the probabilityof cut-through approaches one.3.2 For definitions of other textile terms used in this testmethod, refer to Terminology D123.3.3 For definitions

19、of other protective clothing terms used inthis test method, refer to Terminology F1494.3.4 Pass/fail is a threshold stopping speed value measured inmeters per second (feet per minute) of chain travel speed thatresults in the stated 6-mm (14-in.) cut in the bottom of thelining of the performance pad

20、of a chainsaw-protective device.(See 3.1.10.)4. Summary of Test Method4.1 Test specimens are securely mounted on a test apparatusthat simulates a human leg.4.2 A chainsaw, of specific characteristic and operating at adesignated speed, is brought into contact with the test speci-men.4.2.1 The cutting

21、 action of the saw chain will achieve one ofthe following results: (1) complete cut-through with chain stop,(2) complete cut-through without chain stop, (3) no cut-through with a chain stop, or (4) no cut-through without a chainstop.4.3 Chain speed is measured electronically just prior tocontact wit

22、h test specimen. Chain speed is adjusted andreported based on these measurements.NOTE 2Materials may be characterized by repeated testing at differentspeeds; for quality control, results may be reported as “pass” or “fail” atone pre-selected chain speed.5. Significance and Use5.1 The purpose of this

23、 test method is to provide a measur-able criterion of performance about the level of cut resistanceprovided by different types of protective garments and protec-tive coverings worn by chainsaw operators.5.2 This test method is intended to show to what level aprotective garment can offer resistance t

24、o the cutting action ofa chainsaw.5.3 The protection that can be demonstrated by the garmentsand coverings tested in accordance with this test method isachieved by: (1) the cut resistance of the material to cuttingwhen put in contact with saw chain; (2) pulling a part of thematerial or yarns in the

25、material so that they are drawn into thechain and drive mechanism to block the chain movement; (3)the fibers of the materials used to demonstrate both highresistance to cutting and the capacity to absorb rotationalenergy, so that chain speed can be slowed down sufficiently tostop the movement of the

26、 saw chain; or (4) any combination ofthese.5.4 This test method does not purport to evaluate comfort oflower body protective garments.5.5 In case of a dispute arising from differences in reportedtest results when using this test method for acceptance testingof commercial shipments, the purchaser and

27、 the suppliershould perform comparative tests to determine if there is astatistical bias between their laboratories. Competent statisticalassistance is recommended for the investigation of bias. As aminimum, the two parties should take a group of test speci-mens from the same lot of components to be

28、 evaluated. The testspecimens should then be randomly assigned in equal numbersto each laboratory for testing. If a bias is found, either its causemust be determined and corrected or the purchaser and thesupplier must agree to interpret future test results in light of theknown bias.6. Apparatus56.1

29、Apparatus consists of three main components:6.2 Specimen Holder:6.2.1 A stationary wooden cylinder having a diameter of150 mm (6 in.) and a minimum length of 350 mm (14 in.) (seeFigs. 1 and 2).6.2.1.1 The cylinder is covered with a vinyl nitrile foamhaving a thickness of 18 mm (0.75 in.) (see Figs.

30、1 and 2). Thiscovering shall have a density between 55 and 80 kg m2and itsresistance to a 25 % compression shall be between 10 and20 kPa, measured in accordance with the testing procedure inSpecification D1056.NOTE 3Ensolite M, a synthetic foam rubber made of PVC and NBR,meets the requirements stipu

31、lated in Specification D1056.6.2.1.2 Two specimen attachment plates, each secured bytwo screws to the wooden cylinder parallel to the axis of thatcylinder. Each plate is 75 by 25 mm (3 by 1 in.) (see Figs. 1and 2).6.2.1.3 The stationary wooden cylinder shall be attached toa swivel mechanism that all

32、ows the mandrel to be moved to anangle of either 45 or 90 to the vertical plane of the guide bar.Specimen must be securely attached to mandrel to preventmovement of specimen.6.3 Chainsaw and Related Equipment:6,76.3.1 Saw:6.3.1.1 A gas-powered chainsaw, having an idle speed of2250 6 250 rpm and a ma

33、ximum power of 3.3 6 0.3 kW at8500 rpm that meets the following specifications: (1) minimum5See Appendix X1 to review maintenance checklist.6Husqvarna Model 570 XP, with an eight-tooth drive sprocket, available fromHusqvarna, http:/.7This is the sole source of supply known to the committee at this t

34、ime. If you areaware of alternative suppliers, please provide this information to ASTM Headquar-ters. Your comments will receive careful consideration at a meeting of theresponsible technical committee,1which you may attend.F3324 18266.7 cm3or 4.0 in.3;(2) bore 50 mm; (3) stroke 34 mm; (4)clutch eng

35、agement speed of 3450 6 250 rpm; (5) maximumno-load speed of 12 500 rpm; (6) maximum no-load chainspeed of 27 m s (5475 fpm); and (7) eight-tooth rim drivesprocket. (See Figs. 3 and 4.)6.3.1.2 Throttle control mechanism is used to maintainconstant saw chain speed.6.3.1.3 The engine of the chainsaw i

36、s a two-stroke enginethat uses a gasoline/oil mixture. The gasoline shall be premiumunleaded without alcohol additive and having a minimumanti-knock rating of 90. The oil shall be a high-quality,two-stroke oil specially developed for chainsaws. Mix ratio is50+1(2%two-stroke oil to 98 % gasoline).6.3

37、.1.4 The chainsaw shall be fitted with a resistive-typeplug to reduce interference with the chain speed electronics.NOTE 4When testing constraints prevent dynamometer verification,technician is responsible for checking that the engine is running smoothly,starts readily, has a clean screen, if presen

38、t, a good spark plug, and soforth.NOTE 5All requirements of the chainsaw are determined in accor-dance with many manufacturers published specifications.6.3.2 Chain:8,76.3.2.1 A chain with a pitch of 10 mm (38 in.), a 0.058-in.gage, and a round ground full chisel cutter.6.3.2.2 New chain may be used

39、without sharpening, or thechain must be sharpened using the sharpening procedure notedin Annex A1 before testing.6.3.3 Guide Bar:6.3.3.1 Aguide bar having a length of 500 mm (20 in.), withan eleven-tooth roller-nose sprocket, designed to accommodatea 10-mm (38-in.) pitch, 0.058-in. gage saw chain.6.

40、3.3.2 The roller nose on the guide bar will need to becleaned at periodic intervals. To facilitate repeated cleanings,the rivets attaching the roller nose to the bar should bereplaced. Modification requires that rivets be removed and8The sole source of supply of the saw chain with a pitch of 10 mm (

41、0.40 in.),38,72LP(73LP) Oregon Type, known to the committee at this time is Blount, Inc., 4909S. E. International Way, PO Box 22127, Portland, OR 97222. If you are aware ofalternative suppliers, please provide this information to ASTM InternationalHeadquarters.Item Quantity DescriptionA 1 steel plat

42、e 0.25 by 576 by 670 mmB 2 steel plate 0.25 by 216 by 375 mmC 2 steel plate 0.25 by 208 by 216 mmD 1 steel tube 0.75 by ID 1 mm OD by 172 mmE 1 aluminum plate 0.5 by 4 by 14.5 mmF 1 hardwood or white pine 152 by 400 mmG 2 hinge3by3by116 in.H 1 foam pad 15 by 180 by 360 mm + glueI 6 threaded rod 0.40

43、 by 16 by 120 mmJ 12 bolt0.40by16mmK 8 wood screw 8 by 0.75 mm TRL 1 steel axle 0.75 mm diameter 350 threaded0.75 mm 10 mm 80 mm at each endM 2 pillow block VPS112 valuline browingN 5 bolt0.75by10mmO 1 hexbolt0.75by10by70mmP 1 square 30 mm 90 mm 316 75LQ 1 stopping block 20 mm 40 mm 60LR 1 lever sup

44、port316 80 mm 130 mmS 1 lever 0.25 by 60 by 120 mmT 1 axle 0.250U 1 compression springV 1 micro-switchW 1 safety shield pivoting on DNOTE 1Measurements are in millimetres. Arcs of a circle aremeasured on the circumference of the wood cylinder.FIG. 1 Specimen Holder (Front View Facing Chainsaw)FIG. 2

45、 Specimen Holder (Attachment and Positioning)FIG. 3 Post Contact with Specimen (Front View) and Data Acqui-sition SystemF3324 183holes be enlarged by drilling, so that aircraft-quality bolts andlocking nuts can be used.6.3.4 Chain Guidance and Lubrication:6.3.4.1 The saw chain shall be able to turn

46、freely around thedrive sprocket and roller nose. The system shall be adequatelylubricated. Chain tension shall be adjustable so that applicationof a force of 15 N on the middle of the guide bar causes a chaindeflection of 6 6 0.5 mm.6.4 Chainsaw Support Bracket:6.4.1 The saw is attached to a metal p

47、late that rotates freelyaround the axle (see Figs. 5-7).6.4.2 The horizontal distance between the pivot of the sawand the central axis of the specimen support is 365 6 1mm(14.2 6 0.125 in.) (see Figs. 5 and 6).6.4.2.1 The vertical distance between the pivot of the sawand the center of the drive spro

48、cket cannot exceed 130 mm(5 in.).6.4.3 The mounting mechanism of the chainsaw to thebracket shall be fixed.6.4.4 The guide bar falls perpendicular to the support axisand exerts a static force of 15 N at the point of contact.6.4.5 The vertical dropping distance to the point of contactwith foam is 50

49、mm (2 in.). The longitudinal axis of the guidebar is virtually horizontal at the moment of contact (see Figs.3 and 4).6.4.6 A trigger release mechanism allows freefall withoutinitial acceleration (see Fig. 4 and Fig. 6).6.5 Interfaced Data Acquisition System:6.5.1 The cutting time between wires placed on the top andbottom of the specimen is measured to 60.001 s.6.5.1.1 These wires are connected to the circuitry.6.5.2 The speed of the saw chain may be measured in metresper second or feet per minute (63 %) by mea