Problem 1 30 pts Short Answer Answer only 2 of the following

Problem 1 (30 pts) Short Answer. Answer only 2 of the following 3 questions Only the first 2 responses will be graded. (15 pts Each) 1· Refer to the stres train relationship shown below that was and from an urkom material (15 pts) a) Using the labels in the figure (1,2,3, and 4), identify which portions of the aurve likely represent the following If the term applies to more than one region, list all applicable regions Liner-Bastic Behavior: Rastic Behavior grain Hardening 2 YIeld Ratear During what part of the curve is the material mostly likely\'necking: For which part of the curve is Poisson\'s Ratio applicable Yield Stress b) Also using labelsin the Figure(1,2,3, and 4), answer the following c) Estimate, with units the following values Bastic Modulus ( Ultimate Engineering Sress 2 3 4 100 80 60 20 0.02 0.03 0.00 0.01 Engineering Strain

Solution

YELID STRESS IS = 60 KSI from the graph.

ELASTIC MODULUS IS = STRESS/STRAIN WITH IN THE ELSTIC LIMIT (AS PER HOOKS LAW)

ELASTIC MODULUS IS = 60/0.002

= 30000 KSI (STRESS & STRAIN VALUES ARE COMPUTED FROM GRAPH SHOWN ABOVE)

ULTIMATE STRESS IS = 90 KSI from the graph.