Material Science

Q1 . a ) When two surfaces atomic number 18 in contact , thenEffective modulus (E ) at the interface is accustomed by the following expression Where E1 and E2 atomic number 18 elastic modulus and ?1 and ?2 are Poisson s ratio of metal 1 and 2 respectivelyIn this problem , as both the metals in contact are same (CopperThereforeE1 E2 ECu 140 grade point average and ?1 ?2 ?Cu 0 .3Therefore GPaQ1 . b ) whippy telephone circuit at the yield render or ?p is given by where , H is hardness of the metal and E is Elastic modulus of the metalHere , the metal is copper andHardness H 700 MPa andElastic modulus E 140 GPa 140 103 MPaTherefore , Elastic strain at the yield stress is Q2 .

When a conical indenter of a hard material ploughs onto a soft metal s surface , then normal bear down (N ) is given by the following equation where `r is half(a) the width of the scratch and H is hardness of the materialHere , Normal shipment N 10 Nand Hardness H 700 MPa 700 106 N /m2ThereforeHalf the width of the scratch (r ) will be ThereforeWidth of the scratch 2r 190 ?mThe coefficient of plow friction ) is given by the following equation0 .17Q3 ) Life of a ball bearing is given by the following equationW3L constantWhere W is Load and L is life in number of cycles Where L1 and L2 are life of a Ball Bearing at load W1...If you want to get a full essay, order it on our website: Ordercustompaper.com

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