Damage Boundary Curve破損邊界曲線

DamageBoundaryCurve破損邊界曲線1135217疏家偉1135219李鵬NewWordsProtocol[‘pr??t?k?l]n.協(xié)議，規(guī)則Cylinder[‘s?l?nd?(r)]n.汽缸Pneumatic[nju:?m?t?k]n.氣動的Specimen[‘spes?m?n]n.(試驗）樣品、試件PhrasesandExpressionsvelocitychange速度改變（量）inertiaforce慣性力shockpulse沖擊脈沖trapezoidalpulse梯形脈沖pulseduration脈沖（持續(xù)）時間Contents1432ShockfragilityDrawingdamageboundarycurveConductingafragilitytestDamageboundarytheoryInthecirculationprocessofapackage,valuelosscausedbypoorpackingproducts,suchasthedeformationofthinwallproducts,fragileproductsburst,thefailureoftheinstrument,containerleakage,etc.Damageisakindofaccident,whichontheonehand,theinherentpropertiesoftheproducts(material),density,structure,ontheotherhand,influencedbyexternalcirculationenvironment.Thedamagevalueisusedtodescribethatforfragility.包裝件在流通過程中，由于包裝不良而造成的產(chǎn)品價值損失，如薄壁產(chǎn)品的變形，易碎產(chǎn)品的破裂、儀器的失靈、容器泄漏等。破損是一種流通事故，它一方面受產(chǎn)品的固有屬性(材質(zhì)、密度、結(jié)構(gòu))的支配，另一方面又受外部流通環(huán)境的影響。將這種破損用量值來描述，即為脆值。Fragilityisabletowithstandthemaximumaccelerationvalueproducts.Thefragilityofthesizeofthesaidproductintheprocessofcirculationunderexternalload,accelerationofgravityiscommonlyusedinmultiplesofG.脆值,它是產(chǎn)品所能承受的最大加速度值。脆值的大小表示了產(chǎn)品在流通過程中承受外部載荷的能力,一般用重力加速度的倍數(shù)G來表示ShockfragilityThecharacterizedbythemaximumtolerableaccelerationlevel.脆值定義為產(chǎn)品不發(fā)生物理的或功能的損傷所能承受的最大加速度值Productfragilityreflectsthemechanicalpropertiesoftheproductitself產(chǎn)品的脆弱性反映了產(chǎn)品本身的機械性質(zhì)G-value??andthedamageboundarycurvesaretwomethodstodeterminetheproductsfragility.However,ithaslimitationstoreflecttheimpactresistanceoftheproductwithG-value,itfailstofullyreflecttheimpactresistanceofproducts.G值和損壞邊界曲線兩種方法都可來判別產(chǎn)品的脆值。但G值在反映產(chǎn)品抗沖擊性能上有其局限性，不能完全反映。In1968,Newtonfirstintroducedtheconceptofdamageboundarypackagingsystemdesign,thefragilityvalueofusedproductscanwithstandtypicalaccelerationpulseamplitudeandthevelocitychangeamounttoindirectdescriptionoftheproduct,makethedamageboundarycurve.1968年Newton首次將損壞邊界的概念引入包裝系統(tǒng)設(shè)計,用產(chǎn)品所能經(jīng)受的典型加速度脈沖沖擊的幅值和速度變化量來間接描述產(chǎn)品的脆值,作出破損邊界曲線。DamageboundarytheoryIntheearly1970s,thedamageboundarytheoryoflabsintheschoolofpackaging,MichiganstateuniversityintheUnitedStatesgottheexperimentalverification.Shortlythereafter,thetheorywonwidespreadrecognitionandapplicationinpackagingbusiness,andinthecommoditypackagingdesignisseenasaeffectivemethodtocomputethefragility.20世紀70年代初期，破損邊界理論在美國密歇根州立大學包裝學院的實驗室里得到了實驗驗證。此后不久，這一理論在包裝企業(yè)界獲得了普遍認可和應(yīng)用，并且被視為確定商品包裝設(shè)計中脆值計算的有效方法。DamageboundarytheoryAtthesametime,theexperimentandMaterialsassociation(AmericanSocietyforTestingandMaterials,ASTM)setouttheASTMD3332"mechanicalimpacttesterareusedtodetermineproductshockfragilityofstandardtestmethodforTestingstandards同時，美國實驗與材料協(xié)會（AmericanSocietyforTestingandMaterials，ASTM）制定出了ASTMD3332《使用沖擊試驗機確定產(chǎn)品機械沖擊脆值的標準試驗方法》的測試標準。DamageboundarytheoryRectangularwave>trapezoidalwave>halfsinewave>sawtoothwave矩形波>梯形波>半正弦波>鋸齒波TheinfluenceofshockpulseshapeonthedamageIntheproductunderrectangularwavepulseimpactcausedthemostdamage承受矩形波沖擊脈沖的產(chǎn)品造成的危害最大。Intheproductcirculationenvironmentconditionsundertheconditionofunclear,indeterminingthefragilityoftheproduct,ofteninrectangularwavepulseasthebasisofexperimentandtest.在產(chǎn)品的流通環(huán)境條件不甚明了的情況下，在確定產(chǎn)品的脆值時，通常以矩形波脈沖作為試驗和測試的基礎(chǔ)。TheinfluenceofshockpulseshapeonthedamageDamageBoundaryCurveTheboundarycurvebasedonpeakaccelerationastheordinate,theabscissadenotesthevelocityincrementofaplanecurve,thecurveisdamagedareaandthedamagedareaboundary.破損邊界曲線是以加速度峰值為縱坐標，以速度增量為橫坐標的一條平面曲線,這條曲線是破損區(qū)和非破損區(qū)的分界線.Velocitychange,itssizeisequaltotheaccelerationpulsepointsoftime.速度變化量，其大小等于脈沖加速度對時間的積分.Conducting

afragilitytestTodetermineadamageboundaryrequiresrunningtwosetsoftests.Velocitytestisusedtodeterminetheproduct’sΔVcandaccelerationtestisusedtodetermineG.Howtodrawadamageboundarycurve？VelocityTest(Figure14.3)todeterminetheverticallineofthedamageboundary確定破損邊界的垂直線Step1.Step2.AccelerationTest(Figure14.4)todeterminethehorizontallineofthedamageboundaryUsingasmoothcurvetoconnecttwolines確定破損邊界的水平線，并用平滑曲線連接兩線Twothingsmaybelearnedfromthedamageboundaryplot.Ifthevelocitychangewhichthepackageditemwillexperienceisbelowthecriticalvelocity,nocush