MAT E 273 TEST 2 EXAM QUESTIONS AND CORRECT ANSWERS. VERIFIED 2025/2026.

MAT E 273 TEST 2 EXAM QUESTIONS
AND CORRECT ANSWERS. VERIFIED
2025/2026.




Describing the force: Stress - ANS Stress= F/A



Describing the response: Strain - ANS Percent change in materials length/Original Length



Hooke's Law - ANS Stress=Ee



young modulus units - ANS GPa



Stress units - ANS MPa



Strain units - ANS unitless



What is Poissons ratio? - ANS Relates change in longitudinal direction to change in transverse
direction



Poissons ratio equation - ANS v=-strain(trans)/strain(axial)


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, Ductile - ANS Strain at failure



Toughness - ANS Area under the curve until fracture



Resilience - ANS area under the curve until yielding (Under linear portion)



Dislocations prefer to move along: - ANS -Planes with highest planar density

-Directions with highest linear density



Resolved Shear Stress equation - ANS T(r)=stress(cos(phi)*cos(lambda))

aka schmidt factor



Where is tensile strength on the stress/strain graph? - ANS Max value



Where is yield strength on the stress/strain graph - ANS Where the linear portion ends



In the resolved shear stress equation, what is phi? - ANS The angle between the normal
vector of the plane of interest and the loading axis



In the resolved shear stress equation, what is lambda? - ANS The angle between the direction
of interest on the plane and the axis of loading



Magnified stress equation: - ANS magnified stress=2*original stress(a/p(t))^1/2



Stress concentration factor equation: - ANS K(t)=magnified stress/original stress

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