1、Designation: D5277 92 (Reapproved 2015)Standard Test Method forPerforming Programmed Horizontal Impacts Using anInclined Impact Tester1This standard is issued under the fixed designation D5277; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、 revision, the year of 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 covers the procedures for reproducingand comparing shock damage, such as that
3、which may resultfrom rail switching or pallet marshalling impacts, using anincline impact tester. It is suitable for simulating the types ofshock pulses experienced by lading in rail switching of rail carswith standard draft gear, but not for those with long travel draftgear or cushioned underframes
4、. The test method can also beused for pallet marshalling tests.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
5、 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 hazardsstatements, see
6、Section 6.2. Referenced Documents2.1 ASTM Standards:2D664 Test Method for Acid Number of Petroleum Productsby Potentiometric TitrationD880 Test Method for Impact Testing for Shipping Contain-ers and SystemsD996 Terminology of Packaging and Distribution Environ-mentsD4003 Test Methods for Programmabl
7、e Horizontal ImpactTest for Shipping Containers and SystemsD4169 Practice for Performance Testing of Shipping Con-tainers and SystemsD4332 Practice for Conditioning Containers, Packages, orPackaging Components for TestingE122 Practice for Calculating Sample Size to Estimate, WithSpecified Precision,
8、 the Average for a Characteristic of aLot or Process3. Terminology3.1 DefinitionsGeneral terms and definitions used in thistest method may be found in Terminology D996.3.2 Definitions of Terms Specific to This Standard:3.2.1 programming materiala resilient elastomer withcharacteristics suitable to c
9、ontrol the shock pulse generated, orany other suitable means of control.3.2.2 velocity changethe sum of the velocity at impact andthe rebound velocity.4. Significance and Use4.1 This test method is for use in evaluating the capability ofa container or shipping system to withstand sudden shocks andcr
10、ushing forces, such as those generated from rail switchingimpacts or pallet marshalling, or to evaluate the capability of acontainer and its inner packing, or shipping system, to protectits contents during the sudden shocks and crushing forcesresulting from rail switching or pallet marshalling impac
11、ts.This test method may also be used to compare the performanceof different container designs or shipping systems. The testmay also permit observation of the progressive failure of acontainer or shipping system and damage to the contents. SeePractice D4169 for additional guidance.4.2 This test metho
12、d is not suitable for reproducing impactresulting from the switching of rail cars using long-travel draftgear or cushioned underframes. Refer to Method D4003(revised) as a more suitable method for testing under thesecircumstances, or when more precise control of shock inputs isrequired.5. Apparatus5
13、.1 Inclined Impact Test Equipment, conforming to thefollowing requirements:5.1.1 The incline track, backstop, and carriage shall con-form to the requirements of Method D880, except that the1This test method is under the jurisdiction of ASTM Committee D10 onPackaging and is the direct responsibility
14、of Subcommittee D10.21 on ShippingContainers and Systems - Application of Performance Test Methods.Current edition approved April 1, 2015. Published May 2015. Originallyapproved in 1992. Last previous edition approved in 2008 as D5277 92 (2008).DOI: 10.1520/D5277-92R15.2For referenced ASTM standards
15、, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 194
16、28-2959. United States1backstop need not have a solid steel plate surface or a solidintegral mass at least 50 times the mass of the test specimen.5.1.1.1 No removable hazard shall be fitted.5.1.1.2 In lieu of steel wheels, wheels of polyoxymethylene(Delrin) plastic may be used in order to reduce noi
17、se andimprove shock pulse recording.5.1.2 Aprogramming material or device is required to shapeand control the shock pulse seen by the test specimen(s). Thismaterial or device may be fastened to either the backstop or theimpacting face of the bulkhead.Any material or device may beused, provided that
18、is yields a repeatable, controllable test.Package cushionings of suitable elasticity have been found tobe satisfactory.5.1.3 The carriage shall be fitted with a bulkhead at a90-degree 6 30 min (90 612-degree) angle to the top surfaceof the carriage. The bulkhead shall be fitted so that, uponrelease,
19、 either the bulkhead impacts first on the programmingmaterial, or the carriage and bulkhead impact on the program-ming material at the same time. The bulkhead shall be attachedsecurely to the carriage and shall be sufficiently rigid towithstand impact shocks without significant distortion.5.1.4 When
20、 specified, a backload suitable to reproduce thecrushing forces from other products impacting the test unitshall be provided. This will necessitate sufficient carriage andbulkhead strength, as well as rigidity in the backstop, towithstand the additional forces generated without significantdistortion
21、. The face of this backload that contacts the testspecimen shall replicate a backload of the same product indimension, area of contact, and resilience.5.1.5 To prevent secondary impacts, the test apparatus shallbe fitted with a means of arresting the motion of the carriageafter the primary impact.5.
22、1.6 Instrumentation shall be provided to determine thevelocity at impact and the rebound velocity to an accuracy of6 5 %. Additional instrumentation shall be provided to recordthe shock pulse shape, magnitude, and duration. The shockrecording instrumentation shall have a frequency response atleast 2
23、0 times the frequency being recorded, a cross-axissensitivity maximum of 5 % of full scale, and an accuracy of 62 % of the actual values as measured.5.1.6.1 Instrumentation sensors shall be placed on the out-side of the carriage bulkhead within 6 in. (150 mm), measuredperpendicularly to the programm
24、ing material.5.1.6.2 Optional instrumentation may include optical ormechanical timing devices for measuring the carriage impactand rebound velocities for determining the total velocitychange. If used, this system shall have a response for eachvelocity measurement accurate to within 6 2.5 % of the ac
25、tualvalue.5.1.7 Conditioning ApparatusAdequate facilities shall beprovided for conditioning test specimens at the proper humid-ity and temperature prior to testing, in accordance with thespecification covering the containers or shipping systems to betested.5.1.7.1 ConditioningDepending on the purpos
26、e of thetests, containers may be conditioned prior to the programmedimpact test by either a different physical test, water immersion,exposure to water spray, or exposure to standard or other fixedconditions of air temperature or humidity. It is recommendedthat special atmospheres for conditioning be
27、 selected fromthose given in Practice D4332. Unless otherwise specified,fiberboard or paperboard containers shall be conditioned inaccordance with the preconditioning and standard conditioningatmospheres specified in Practice D4332 (see also PracticeD4169 for additional guidance).5.1.7.2 Where the m
28、oisture content of fiberboard containersis determined, it should be determined in accordance withMethod D664.6. Hazards6.1 This test method may produce severe mechanical re-sponses in the test specimen and apparatus. Operating person-nel must therefore remain alert to potential hazards and takeneces
29、sary safety precautions. The test area should be clearedprior to each impact. The testing of hazardous materials orproducts may require special precautions that must be ob-served. Safety equipment may be required, and its use must beunderstood before starting the test.7. Sampling7.1 The test specime
30、ns and number of samples shall bechosen to permit an adequate determination of representativeperformance. Practice E122 is recommended.7.2 In the absence of any sampling plan, at least threerepresentative specimens should be selected for performanceevaluation.8. Test Specimens8.1 When the protective
31、 capability of a container or ship-ping system is to be evaluated, it is preferable to pack thecontainer with the actual contents for which it was designed(Note 1). When the integrity of a container or shipping systemis to be evaluated, pack the container or shipping system witheither the actual con
32、tents or a load simulating the contents.Regardless of which procedure is used, close the container orshipping system in the same manner that will be used inpreparing it for shipment.NOTE 1Where the use of actual contents is not feasible because ofexcessive cost or danger, a dummy load simulating the
33、 contents withrespect to dimensions, center of gravity, moment of inertia, density, flowcharacteristics, etc. may be used.9. Procedure9.1 Prior to initiating the test, write a test plan that includesthe following information.9.1.1 State the number of impacts the test unit will receive(Note 2).NOTE 2
34、The number of impacts to which a product will be subjectedin transit may range from 1 to more than 15. The velocity changes mayrange from 1 to 10 mph (1.6 to 16.1 kph). The duration of the impactshocks is dependent on both the draft gear of the rail cars used to transportthe product and the draft ge
35、ar of impacting or impacted rail cars. Forstandard draft gears, this will range from 30 to 50 milliseconds. Theacceleration levels observed are normally a function of the velocitychange and pulse duration. The accelerations corresponding to the abovedurations are in the range of 15 g (147 m/s2). Bec
36、ause rail car switchingimpacts may occur many times during a shipment, it is recommended thatD5277 92 (2015)2a test consist of a number of lower level impacts or an incremental seriesof increasing impact magnitude, rather than a single large magnitudeimpact. This type of testing also provides better
37、 information by bracketingthe failure between two impact levels.9.1.2 State the velocity change for each impact.9.1.3 State the pulse duration of the impact shock.9.1.4 State the mass, configuration, and friction character-istics of the backload, if used (Note 3).NOTE 3The backload weight/friction r
38、equirement is not well defineddue to insufficient environmental measurement of lading force levels.Through preliminary testing, backload pressures ranging from 0.3 to 1.0psi (2 to 7 kPa) on the container impacting surface have created damagelevels normally observed in the distribution environment. T
39、hese pressuresare based on a coefficient of friction of 0.5. See Appendix X1 foradditional information.9.1.5 State whether conditioning is required and the condi-tioning to be used, if any, including the preconditioning andconditioning atmosphere required.9.1.6 Use a suitable test procedure for pall
40、et marshallingimpact tests; one is set out in Method D4003.9.2 After the test parameters have been established, placedummy weights equivalent to the test unit specimen on thecarriage at the center position of the specimen mountingsurface, with the face or edge that is to receive the impactpositioned
41、 firmly against the upright bulkhead. Use a duplicatespecimen, if available. Then backload the dummy weight withthe backload weights, where specified, to represent the back-load conditions specified in the test plan. Impact the carriagefrom various pullback distances into the selected programmerto a
42、chieve the desired velocity changes (impact plus reboundvelocity). Record these pullback distances.NOTE 4The type of programmer material or device used shall beselected on the basis of the shock pulse, waveform, and duration desired.9.2.1 This pretesting is not required if the testing parametersare
43、known from previous experience.9.3 Replace the dummy load with the test specimen andplace it on the center of the carriage, with the face or edge thatis to receive the impact positioned firmly against the uprightbulkhead. Backload the test specimen with additional productor the dummy weight.9.4 Test
44、 the containers that have been conditioned in theconditioned atmosphere or immediately upon removal fromthat atmosphere.9.5 Pull the carriage back the distance necessary to achievethe desired velocity change (impact plus rebound velocity) fora single impact. Measure to determine both the velocity ch
45、angeof the carriage and the acceleration time profile of the carriagebulkhead.9.6 The packaging, shipping system, and product may beinspected for damage after each impact.9.7 Subject the test unit to the number of impacts, and atvelocity changes, specified in the test plan, or until failureoccurs. E
46、ach axis of concern can be evaluated as specified in9.2 through 9.7.10. Report10.1 Report the following information:10.1.1 Reference to this test method, noting any deviationsfrom the test method.10.1.2 Dimensions of the container or shipping systemunder testing; complete structural specifications;
47、kinds ofmaterials; description and specifications for blocking andcushioning, if used; spacing, size, and kind of fasteners;method of closing and strapping, if any; and tare and grossmasses.10.1.3 Description of the contents of the container orshipping system under testing and, if not tested with th
48、e actualcontents intended to be shipped, description of these actualcontents.10.1.4 Number of specimens tested per sample.10.1.5 Method of conditioning the container, if any.10.1.6 Description of apparatus, backload, and specialinstrumentation, including whether the wheels were made fromsteel or Del
49、rin. Where other values for F than those recom-mended in Appendix X1 are used, state of the value.10.1.7 Pullback distance used for each test.10.1.8 Measured velocity change, velocity at impact, shockpulse amplitude, duration, and waveform of each test.10.1.9 Detailed record of the test results for each containeror shipping system, including damage to the container orshipping system and contents, together with any other obser-vation that may assist in interpreting the results correctly or aidin improving the design of the container or shipping system orthe method of packag
