Damage Boundary Curve破损边界曲线

DamageBoundaryCurve破损边界曲线1135217疏家伟1135219李鹏NewWordsProtocol[‘prəʊtəkɒl]n.协议，规则Cylinder[‘sɪlɪndə(r)]n.汽缸Pneumatic[nju:ˈmætɪk]n.气动的Specimen[‘spesɪmən]n.(试验）样品、试件PhrasesandExpressionsvelocitychange速度改变（量）inertiaforce惯性力shockpulse冲击脉冲trapezoidalpulse梯形脉冲pulseduration脉冲（持续）时间Contents1432ShockfragilityDrawingdamageboundarycurveConductingafragilitytestDamageboundarytheoryInthecirculationprocessofapackage,valuelosscausedbypoorpackingproducts,suchasthedeformationofthinwallproducts,fragileproductsburst,thefailureoftheinstrument,containerleakage,etc.Damageisakindofaccident,whichontheonehand,theinherentpropertiesoftheproducts(material),density,structure,ontheotherhand,influencedbyexternalcirculationenvironment.Thedamagevalueisusedtodescribethatforfragility.包装件在流通过程中，由于包装不良而造成的产品价值损失，如薄壁产品的变形，易碎产品的破裂、仪器的失灵、容器泄漏等。破损是一种流通事故，它一方面受产品的固有属性(材质、密度、结构)的支配，另一方面又受外部流通环境的影响。将这种破损用量值来描述，即为脆值。•Fragilityisabletowithstandthemaximumaccelerationvalueproducts.Thefragilityofthesizeofthesaidproductintheprocessofcirculationunderexternalload,accelerationofgravityiscommonlyusedinmultiplesofG.脆值,它是产品所能承受的最大加速度值。脆值的大小表示了产品在流通过程中承受外部载荷的能力,一般用重力加速度的倍数G来表示ShockfragilityThecharacterizedbythemaximumtolerableaccelerationlevel.脆值定义为产品不发生物理的或功能的损伤所能承受的最大加速度值Productfragilityreflectsthemechanicalpropertiesoftheproductitself产品的脆弱性反映了产品本身的机械性质G-value​​andthedamageboundarycurvesaretwomethodstodeterminetheproductsfragility.However,ithaslimitationstoreflecttheimpactresistanceoftheproductwithG-value,itfailstofullyreflecttheimpactresistanceofproducts.G值和损坏边界曲线两种方法都可来判别产品的脆值。但G值在反映产品抗冲击性能上有其局限性，不能完全反映。In1968,Newtonfirstintroducedtheconceptofdamageboundarypackagingsystemdesign,thefragilityvalueofusedproductscanwithstandtypicalaccelerationpulseamplitudeandthevelocitychangeamounttoindirectdescriptionoftheproduct,makethedamageboundarycurve.1968年Newton首次将损坏边界的概念引入包装系统设计,用产品所能经受的典型加速度脉冲冲击的幅值和速度变化量来间接描述产品的脆值,作出破损边界曲线。DamageboundarytheoryIntheearly1970s,thedamageboundarytheoryoflabsintheschoolofpackaging,MichiganstateuniversityintheUnitedStatesgottheexperimentalverification.Shortlythereafter,thetheorywonwidespreadrecognitionandapplicationinpackagingbusiness,andinthecommoditypackagingdesignisseenasaeffectivemethodtocomputethefragility.20世纪70年代初期，破损边界理论在美国密歇根州立大学包装学院的实验室里得到了实验验证。此后不久，这一理论在包装企业界获得了普遍认可和应用，并且被视为确定商品包装设计中脆值计算的有效方法。DamageboundarytheoryAtthesametime,theexperimentandMaterialsassociation(AmericanSocietyforTestingandMaterials,ASTM)setouttheASTMD3332mechanicalimpacttesterareusedtodetermineproductshockfragilityofstandardtestmethodforTestingstandards同时，美国实验与材料协会（AmericanSocietyforTestingandMaterials，ASTM）制定出了ASTMD3332《使用冲击试验机确定产品机械冲击脆值的标准试验方法》的测试标准。DamageboundarytheoryRectangularwavetrapezoidalwavehalfsinewavesawtoothwave矩形波梯形波半正弦波锯齿波TheinfluenceofshockpulseshapeonthedamageIntheproductunderrectangularwavepulseimpactcausedthemostdamage承受矩形波冲击脉冲的产品造成的危害最大。Intheproductcirculationenvironmentconditionsundertheconditionofunclear,indeterminingthefragilityoftheproduct,ofteninrectangularwavepulseasthebasisofexperimentandtest.在产品的流通环境条件不甚明了的情况下，在确定产品的脆值时，通常以矩形波脉冲作为试验和测试的基础。TheinfluenceofshockpulseshapeonthedamageDamageBoundaryCurveTheboundarycurvebasedonpeakaccelerationastheordinate,theabscissadenotesthevelocityincrementofaplanecurve,thecurveisdamagedareaandthedamagedareaboundary.破损边界曲线是以加速度峰值为纵坐标，以速度增量为横坐标的一条平面曲线,这条曲线是破损区和非破损区的分界线.Velocitychange,itssizeisequaltotheaccelerationpulsepointsoftime.速度变化量，其大小等于脉冲加速度对时间的积分.ConductingafragilitytestTodetermineadamageboundaryrequiresrunningtwosetsoftests.Velocitytestisusedtodeterminetheproduct’sΔVcandaccelerationtestisusedtodetermineG.Howtodrawadamageboundarycurve？VelocityTest(Figure14.3)todeterminetheverticallineofthedamageboundary确定破损边界的垂直线Step1.Step2.AccelerationTest(Figure14.4)todeterminethehorizontallineofthedamageboundaryUsingasmoothcurvetoconnecttwolines确定破损边界的水平线，并用平滑曲线连接两线Twothingsmaybelearnedfromthedamageboundaryplot.Ifthevelocitychangewhichthepackageditemwillexperienceisbelowthecriticalvelocity,nocushioningforshockprotectionisneededIfthevelocitychangewhichthepackageditemwillexperienceisabovethecriticalvelocity,acushionshouldbedesignedsothatittransmitslessaccelerationthanthecriticalaccelerationlevel