CME Study Sheet Test 2

CME Study Sheet Test 2 - Study Sheet Chapters 6-9 Chapter 6...

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Study Sheet Chapters 6-9 Chapter 6 Vocabulary Anelasticity- time dependent elastic (nonpermanent) deformation Design stress ( σ d )- product of the calculated stress level (on the basis of estimated maximum load) and a design factor (which has a value greater than unity). Used to protect against unanticipated failure. Ductility- a measure of a material’s ability to undergo an appreciable plastic deformation before fracture; it may be expressed as percent elongation (%EL) or percent reduction in area (%RA) from a tensile test. Elastic deformation- deformation that is nonpermanent—that is, totally recovered upon release of an applied stress. Elastic recovery- nonpermanent deformation that is recovered or regained upon the release of a mechanical stress engineering stress( )- the instantaneous load applied to a specimen divided by its cross- σ sectional area before any deformation engineering strain ( )- the change in gauge length of a specimen (in the direction of an ε applied stress) divided by its original gauge length hardness- the measure of a material’s resistance to deformation by surface indentation or by abrasion modulus of elasticity ( E )- the ratio of stress to strain when deformation is totally elastic; also a measure of the stiffness of a material plastic deformation- deformation that is permanent or non-recoverable after release of the applied load. It is accompanied by permanent atomic displacements. poisson’s ratio-the ratio of lateral and axial strains proportional limit- the point on a stress-strain curve at which the straight line proportionality between stress and strain ceases. resilience- the capacity of a material to absorb energy when it is elastically deformed safe stress ( σ w )- a stress used for design purposes; for ductile metals, it is the yield strength divided by a factor of safety shear- a force applied so as to cause or tend to cause two adjacent parts of the same body to slide relative to each other, in a direction parallel to their plane of contact tensile strength (TS)- the maximum engineering stress, in tension, that may be sustained without fracture. Often termed ultimate (tensile) strength toughness- a measure of the amount of energy absorbed by a material as it fractures. Toughness is indicated by the total area under the material’s tensile stress-strain curve. yielding- the onset of plastic deformation yield strength( σ y )- the stress required to produce a very slight yet specified amount of plastic strain; a strain offset of 0.002 is commonly used.
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Chapter 6 Equations: = F/A σ 0 =(l ε i -l 0 )/l 0 = l/l Δ 0 = F/A τ 0 =E (Hooke’s Law) σ ε =G τ γ v= - ε x / ε z =- ε y / ε z E =2G(1+ v ) G 0.4 E in most metals %EL =[(l f -l 0 )/l 0 ]*100 %RA=[(A 0 -A f )/A 0 ]*100 U r = 0 y ε * σ d ε U r = ½* σ y * ε y =1/2* σ y *( σ y /E) = σ 2 y /(2* E ) Ε T =ln(l i /l 0 ) σ T = (1+ ) σ ε ε T =ln(1+ ) ε σ T = K ε n T TS (MPa)=3.45*HB TS (psi)= 500*HB
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σ w = σ y /N Chapter 7 Vocabulary Cold working- the plastic deformation of a metal at a temperature below that at which it
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CME Study Sheet Test 2 - Study Sheet Chapters 6-9 Chapter 6...

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