【英文标准名称】:StandardTestMethodforImpactResistanceofFlat,RigidPlasticSpecimenbyMeansofaStrikerImpactedbyaFallingWeight(GardnerImpact)
【原文标准名称】:使用落锤冲击(Gardner冲击)法的扁平硬质塑料试样耐冲击性能的标准试验方法
【标准号】:ASTMD5420-2010
【标准状态】:现行
【国别】:
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D20.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:镖冲击;落锤重量冲击;Gardner冲击;冲击;抗冲击;平均破坏能;平均破坏高度;硬质塑料;镖冲击方法;破坏端点-塑料;落锤测试-塑料;Gardner冲击试验;冲击测试-塑料;平均破坏能量/高度/重量;重锤冲击试验;
【英文主题词】:dartimpact;fallingweightimpact;Gardnerimpact;impact;impactresistance;mean-failureenergy;mean-failureheight;rigidplastic;Dartimpactmethod;Failureendpoint--plastics;Fallingweighttest;Gardnerimpacttest;Impacttesting--plastics;Me
【摘要】:Plasticsareviscoelasticitisandthereforepossiblethattheyaresensitivetochangesinvelocityofweightsfallingontheirsurfaces.However,thevelocityofafree-fallingobjectisafunctionofthesquarerootofthedropheight.Achangeofafactoroftwointhedropheightwillcauseachangeofonly1.4invelocity.Hagan,etal(2)foundthatthemean-failureenergyofsheetingwasconstantatdropheightsbetween0.30and1.4m.Differentmaterialsresponddifferentlytochangesinthevelocityofimpact.ThetestconditionsusedinGeometryGAarethesameasthoseusedinGeometryFAofTestMethodD5628(seeTable1).ThetestconditionsofGeometryGBareequivalenttothegeometryusedfortheGardnerVariableHeightImpactTest(3).ThetestconditionsofGeometryGCcauseapunch-sheartypeoffailurebecausethesupport-plateholeisclosetothediameterofthestriker.ThetestconditionsofGeometryGDarethesameasthoseinTestMethodD3763.ThetestconditionsofGeometryGEarethesameasthoseinTestMethodD4226,impactorheadconfigurationH.25.Becauseofthenatureofimpacttesting,theselectionofatestmethodandstrikermustbesomewhatarbitrary.Considertheenduseenvironmentandrequirementswhenchoosingfromtheavailablestrikergeometries.However,theselectionofanyoneofthestrikergeometriesispermitted,aftersuchconsideration.Note28212;Materialprocessingcanhaveasignificantaffectonthedevelopmentofaplastic''sphysicalproperties.Consultrelevantmaterialstandardsforprocessingguidelines1.1Thistestmethodcoversthedeterminationoftherelativerankingofmaterialsaccordingtotheenergyrequiredtocrackorbreakflat,rigidplasticspecimensundervariousspecifiedconditionsofimpactofastrikerimpactedbyafallingweight.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThereisnosimilarorequivalentISOstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_140_10
【页数】:8P.;A4
【正文语种】: