SE 312 FINAL EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026

SE 312 FINAL EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026 Elastic Modulus -only found in mat w linear relat in elastic regions -approximated using .2% yield strength -relates stress to strain by hooke's law - Answers False (also non-lin) False (thats the secant modulus) True (for linear materials) (Tension) Yielding -type of failure? -found using secant modulus -is the lower yield point for mat w upper and lower YP - Answers True False (not even close) True (upper is unstable) (Tension) Elastic Region -No permanent deformation -always obeys Hooke's law -mat that catastrophically fail in this reg are brittle -uniform stress state - Answers True False (PMMA/Cast Iron dont) True True (Tension) Plastic Region -Perm Deformation -young's modulus relates stress to strain in this region -Fractures are 90 deg to princip diection of stress -uniform stress state - Answers True False (thats the elastic region) False False (uniform before necking, nonuni after) Aluminum -Upper and lower yield -ductile -orange peel on deformed surfaces - Answers False True True 1045 Steel -Mill scale on specimen -ductile behavior in tension -upper and lower yield points - Answers -True -True -True Cast Iron -similar behav in tens and compress -heterogeneous -has a linear elastic region in tension - Answers False True (graphite flakes) False (Secant modulus) Rockwell hardness -Scale B = soft mat, scale C = hard mat -Require correction if performed on curved surfaces -number based on diameter of indentation - Answers True True (curvature correction) False (depth of indentation) Brinell Hardness -Only for homegeneous mat -good for soft and hard mat -largest of the indenters - Answers False True True (10 mm diamter indent)