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机器设计-综合方法p0627.pdf

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MACHINEDESIGN-AnIntegratedApproach,4thEd.6-27-1

PROBLEM6-27

Statement:AstoragerackistobedesignedtoholdthepaperrollofProblem6-8asshowninFigureP6-12.

Determineasuitablevaluefordimensionainthefigureforaninfinite-lifefatiguesafetyfactorof

2.Assumedimensionb=100mmandthatthemandrelissolidandinsertshalfwayintothe

paperroll.

(a)ThebeamisaductilematerialwithSut=600MPa.

(b)Thebeamisacast-brittlematerialwithSut=300MPa.

3

Given:PaperrolldimensionsOD1.50mRolldensityρ984kgm

ID0.22mDesignsafetyfactorN2

fd

L3.23mBrittletensilestrengthS300MPa

rollutb

DuctiletensilestrengthS600MPa

uta

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