Graphs are in order of A,B,C,D Consider the stress vs. strain curves for four di

Question

Graphs are in order of A,B,C,D

Consider the stress vs. strain curves for four different materials, as shown below. Rank the materials in order of increasing stiffness. E.g., if A is the least stiff, then B, then C, and D is the stiffest, enter ABCD. You have 6 tries.

2.
Rank the materials from most brittle to most ductile. E.g., if A is the least ductile, then B, then C, and D is the most ductile, enter ABCD. You have 6 tries.

Graphs are in order of A,B,C,D. Graphs are in order of A,B,C,D Consider the stress vs. strain curves for four different materials, as shown below. Rank the materials in order of increasing stiffness. E.g., if A is the least stiff, then B, then C, and D is the stiffest, enter ABCD. You have 6 tries. Rank the materials from most brittle to most ductile. E.g., if A is the least ductile, then B, then C, and D is the most ductile, enter ABCD. You have 6 tries.

Explanation / Answer

1. Stiffness => High modulus of elasticty

E = slope

Slope A = 200/10 = 20

Slope B = 240/6 = 40

Slope C = 24/6 = 4

Slope D = 320/4 = 80

CABD

2. Brittle => more strain from yield point to break point

Strain A = 15 -10 = 5

Strain B = 9 - 6 = 3

Strain C = 10 - 6 = 4

Strain D = 5.5 - 4 = 1.5

most brittle = D

Most ductile = A

DBCA

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