机械工程专业英语文本施平07

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1、第7次课的教学整体安排授课时间第7周周4第3、4节课时安排2授课题目(教学章、节或主题)：EngineeringDesignandSafetyFactors教学目的、要求（分掌握、理解、了解三个层次）：掌握本课的专业词汇学习并掌握专业英语的翻译技巧教学内容（包括基本内容、重点、难点）：EngineeringDesignandSafetyFactorsThedesignprocess;Safetyfactorsinengineeringdesigns;Thematerialssystem讲解课文和专业词汇重点：在翻译的过程中句子表达的准确性和整篇文章的逻

2、辑性。难点：在科技英语翻译过程中语言的转换技巧讨论、思考、作业：作业：复习课文背诵专业词汇参考资料（含参考书、文献等）：教学过程设计：复习10分钟，授新课90分钟，安排讨论　分钟，布置作业　分钟授课类型：　理论课　讨论课　实验课　练习课　其他教学方式：　讲授　　讨论　　指导　　其他教学资源：　多媒体　　　模型　　　实物　　挂图　　　音像　　其他填写说明：1.每项页面大小可自行添减；2.教学内容与讨论、思考题、作业部分可合二为一。7EngineeringDesignandSafetyFactors工程设计和安全系数Anyconsiderationofen

3、gineeringmaterialsandengineeringdesignofsystemsutilizingmaterialsmustinitiallydealwith(涉及到)Murphy’sLawforMaterialssystemsandthelawsofmaterialsapplications:Murphy’sLaw:Ifanymaterialcanfail,itwill.Lawsofmaterialsapplications(1)Allmaterialsareunstable.(2)Thematerialssystemisonlyass

4、trongorasstableasitsweakestormostunstablecomponent.Althoughtheyarebothobviousandincontrovertible(无可争辫的),wemightelaborateupontheselaws,especiallythelawsofmaterialsapplications.Allmaterialsareindeedunstable.Evensuchmaterialsasplatinumcanbedegradedinparticularenvironments.Understre

5、ss(应力，strain应变),allmaterialsrespondtothatstress.Creep(蠕变)isanexample.Givenenoughtime,failure(失效)canbecalculatedtooccurinallmaterialsundercreepstress.Stressandenvironmentcanactinconcerttocausefailure,forexample,stresscorrosioncracking.Creep-temperatureeffectsandstress-temperature

6、effectscancontributetothedegradationofpropertiesandcomponentsandsystemfailure.ThedesignprocessThedesignprocessusuallybeginswithaspecificationofasolution.Wesometimesalludetoadesigncycle,buttheprocessmaycontainadesigncycleplusdesignimplementation,whichinvolvesactualproductionbased

7、uponthedesign.Thedesigncyclecaninvolvetheoriginalthoughts,sketches,andknowledgethatinthespecificationstageproduceengineeringdrawings.Computer-aideddesign(CAD,CAM计算机辅助制造)isnowemployedtoimplementacycleinwhichvariousdesignsordesignideasmaybetestedorsimulated.Evenintheearlydesigncyc

8、le,itisusefultohavesomeconceptofavailablemateri