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(dòng)的Specimen[‘spes?m?n]n.(試驗(yàn)）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(shí)間Contents1432ShockfragilityDrawingdamageboundarycurveConductingafragilitytestDamageboundarytheoryInthecirculationprocessofapackage,valuelosscausedbypoorpackingproducts,suchasthedeformationofthinwallproducts,fragileproductsburst,thefailureoftheinstrument,containerleakage,etc.Damageisakindofaccident,whichontheonehand,theinherentpropertiesoftheproducts(material),density,structure,ontheotherhand,influencedbyexternalcirculationenvironment.Thedamagevalueisusedtodescribethatforfragility.包裝件在流通過(guò)程中，由于包裝不良而造成的產(chǎn)品價(jià)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(lái)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(guò)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(lái)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(jī)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(lái)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(jì),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(lái)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(jì)70年代初期，破損邊界理論在美國(guó)密歇根州立大學(xué)包裝學(xué)院的實(shí)驗(yàn)室里得到了實(shí)驗(yàn)驗(yàn)證。此后不久，這一理論在包裝企業(yè)界獲得了普遍認(rèn)可和應(yīng)用，并且被視為確定商品包裝設(shè)計(jì)中脆值計(jì)算的有效方法。DamageboundarytheoryAtthesametime,theexperimentandMaterialsassociation(AmericanSocietyforTestingandMaterials,ASTM)setouttheASTMD3332"mechanicalimpacttesterareusedtodetermineproductshockfragilityofstandardtestmethodforTestingstandards同時(shí)，美國(guó)實(shí)驗(yàn)與材料協(xié)會(huì)（AmericanSocietyforTestingandMaterials，ASTM）制定出了ASTMD3332《使用沖擊試驗(yàn)機(jī)確定產(chǎn)品機(jī)械沖擊脆值的標(biāo)準(zhǔn)試驗(yàn)方法》的測(cè)試標(biāo)準(zhǔn)。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(shí)，通常以矩形波脈沖作為試驗(yàn)和測(cè)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(biāo)，以速度增量為橫坐標(biāo)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(duì)時(shí)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