Question

Identify the material. that fits the stress-strain curve.

A)

Instructions CLI Tesile TesTeR Test Specimens Material - Mild Steel ruanne PRINT 45 40 35 30 25 Load (kN) 20 15 10 5 5 10 15 Extension (mm) CLI - Tensile tester YOU HAVE SELECTED... MILO STEEL START

MILD STEEL

Yield Strength: 30 kN, Ultimate Strength: 40 kN, Young Modulus: 30/0.7 kN/mm = 43 kN/mm

B)

ALUMINUM

Yield Strength: 20 kN, Ultimate Strength: 26 kN, Young Modulus: 20 kN/mm

C)

CAST IRON

Yield Strength: N/A, Ultimate Strength: 20 kN, Young Modulus: 20/0.4 kN/mm = 50 kN/mm

D)

COPPER

Yield Strength: 30 kN, Ultimate Strength: 35 kN, Young Modulus: 30 kN/mm

Answer 1

In case of MILD STEEL , ALUMINIUM AND COPPER as they are ductile in nature , these material shows ductile fracture .Ductile fracture is a type of fracture which is characterized by visible plastic deformation. This usually occurs before the actual fracture. The term "ductile fracture" refers to the failure of highly ductile materials. In such cases, materials pull apart instead of cracking.

Nature show by the mild steel fracture is usually cup and cone in nature

While in case of the CAST IRON which is brittle in nature shows Brittle fracture .brittle fracture is the sudden, very rapid cracking of material under stress where the material shows little or no evidence of ductility or plastic deformation before the fracture occurs.

Answer:- CAST IRON is the material which fits the stress-strain curve.