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1Machine Component DesignNew Chapter Fundamentals of Dimension DeterminationA Combined Chapters of 4, 6, 8 and 17Mainly use the Teaching NotesChapter 6 (Reference book)Fundamentals of Dimension DeterminationLinkages of machine parts need to have adequate strength and rigidity to support the forces acting on the parts. There are several considerations that apply in the design of machine elements. 6-1 Strength and Failure Strength: It means to make part strong enough so that it will not fail in service. Failure: It not only means breaking of a part but also related with wear, noise, plastic and elastic deformation, and creep of materials. The designer, in considering all the possible modes of failure, must consider calculations of the followings: 1.Allowable Stress 2.Rigidity 3.Stability 4.Wear Usually, the calculations will give the minimum permissible dimensions. In practical usage, these need to be modified. 6-2 Service Life and Reliability This will consider how long a mechanism or machine can run. This is a statistical problem. 6-3 Factor of Safety If life is to be infinite loadservicenormalloadsafeimumsfmax..=------------ (1) If life is to be finite lifeservicedesiredlifeserviceusefulsf=..------------- (2) If stress is main concern, from (1) by dividing area
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