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1、自从人类进入商品经济社会以来,贸易即已成为人们日常活动的主要部分,并成为一国经济增长的主动力。国际分工的深化、大量国际统一标准规则的建立机械设计英文简历 篇一:机械设计制造及其自动化英文 英文原文: Mechanicalpropertiesofmaterials Thematerialpropertiescanbeclassifiedintothreemajorheadings:(1)physical, (2)chemical,(3)mechanical Physicalproperties Densityorspecificgravity,moisturecont
2、ent,etc.,canbeclassifiedunderthiscategory. Chemicalproperties Manychemicalpropertiescomeunderthiscategory.Theseincludeacidityoralkalinity,react6ivityandcorrosion.Themostimportantoftheseiscorrosionwhichcanbeexplainedinlayman’stermsastheresistanceofthematerialtodecaywhileincontinuoususeinapar
3、ticularatmosphere. Mechanicalproperties Mechanicalpropertiesincludeinthestrengthpropertiesliketensile,compression,shear,torsion,impact,fatigueandcreep.Thetensilestrengthofamaterialisobtainedbydividingthemaximumload,随着信息化和全球化的发展,国家及地区之间的贸易也已成为拉动一国经济的三驾马车之一,甚至是三驾马车之首,奥巴马政府成立之日起自从人类进入商品经济社会以来,
4、贸易即已成为人们日常活动的主要部分,并成为一国经济增长的主动力。国际分工的深化、大量国际统一标准规则的建立whichthespecimenbearsbytheareaofcross-sectionofthespecimen. ThisisacurveplottedbetweenthestressalongtheThisisacurveplottedbetweenthestressalongtheY-axis(ordinate)andthestrainalongtheX-axis(abscissa)inatensiletest.Amaterialtendstochangeorch
5、angesitsdimensionswhenitisloaded,dependinguponthemagnitudeoftheload.Whentheloadisremoveditcanbeseenthatthedeformationdisappears.FormanymaterialsthisoccursoptoacertainvalueofthestresscalledtheelasticlimitAp.Thisisdepictedbythestraightlinerelationshipandasmalldeviationthereafter,inthestress-str
6、aincurve() .Withintheelasticrange,thelimitingvalueofthestressuptowhichthestressandstrainareproportional,iscalledthelimitofproportionalityAp.Inthisregion,themetalobeyshookes’slaw,whichstatesthatthestressisproportionaltostraininthe elasticrangeofloading,(thematerialcompletelyregainsitsorigina
7、ldimensionsaftertheloadisremoved).Intheactualplottingofthecurve,the随着信息化和全球化的发展,国家及地区之间的贸易也已成为拉动一国经济的三驾马车之一,甚至是三驾马车之首,奥巴马政府成立之日起自从人类进入商品经济社会以来,贸易即已成为人们日常活动的主要部分,并成为一国经济增长的主动力。国际分工的深化、大量国际统一标准规则的建立proportionalitylimitisobtainedataslightlylower