b) Fabe 24. (2) at rupture, ductile materials a) fracture without yield b) ruptu
ID: 2088648 • Letter: B
Question
b) Fabe 24. (2) at rupture, ductile materials a) fracture without yield b) rupture without necking c) have fibrous cup and cone shape d) none of these e) Fracture 30. (2) strain when unloading after plastic motion is: a) permanent set b) strain hardening c) elastic region d) elastic recovery e) none of these 25. (2) Which point on stress strain curve occur after proportionality limit? a) Elastic limit b) Yield point c) Ultimate point d) Breaking point e) None of these 31. (2) Yield strength is always well defined 26. (2) brittle materials neck at rupture for metals a) True b) False b) false 27. (2) engineering stress is alwaysExplanation / Answer
24. (c) Has fabrous cup and cone shape
25. (c) Elastic limit
26. (b) false ( flat fracture surface in brittle fracture )
27 (a) true
28 (e) fracture
29 (a) yield point
30 (d) elastic recovery
31 (b) false ( yield strength is well defined for ductile materials )
32 (b) false ( logitudinal tension causes lateral contraction and lnngitudinal compresson causes latral expansion )
33 ( b) false ( max value of poison's ration is 0.5 as elastic constants can't be negative E = 3K(1-2?) )
34 (b) false ( Bending produces tension on one side of neutral axis and compression on other side of neutral axis in beam. In case of pure bending there is no shear stress in beam )
35 (d) electro-resistive gauge ( strain gauge )
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