Mechanical Properties of Materials (Assignment #5)

If engineering stress and true stress were measured simultaneously during a tensile test which would have a higher value?

True stress.

Which of the following materials has the high hardness:

Alumina ceramic

The transverse rupture strength is a property usually associated with which one of the following material types:

Ceramics

Which if the following statements are the basic types of static stresses to which a material can be subjected?

Compression, shear, and tensile.

Which one of the following materials has the highest modulus of elasticity?

Diamond.

Which one of the following types of stress strain relationship best describes the behavior of metals at temperatures above their respective recrystallization points:

Elastic and perfectly elastic

Which of the following types of stress/strain relationship best describes the behavior of most metals at room temperature?

Elastic and strain hardening.

Hooke's Law defines which one of the following regions of the stress and strain relationship for engineering materials?

Elastic region.

If engineering strain and true strain were measured simultaneously during a tensile test, which would have the higher value?

Engineering strain.

Viscosity can be defined as the ease with which a fluid flows, true or false?

False

The plastic region of the stress-strain curve for a metal is characterized by a proportional relationship between stress and strain?

False.

Which one of the following types of stress/strain relationships best describes the behavior of brittle materials such as ceramics and thermosetting plastics?

Perfectly elastic.

The formation of new strain-free grains in a metal that has been heated to an elevated temperature is called which one of the following:

Recrystallization

The flow curve describes the property of metals known as which one of the following?

Strain hardening.

Which one of the following is the correct definition of ultimate tensile strength, as derived from the results of a tensile test on a metal specimen?

The maximum load divided by the original area of the specimen.

Most hardness tests involve pressing a hard object into the surface of a test specimen and measuring the resulting indentation or its effect, true or false?

True

Viscoelasticity can be defined as the property of a material that determines the strain it experiences when subjected to combinations of stress and temperature over time, true or false?

True

The modulus of elasticity is also known as which one of the following?

Young's modulus.

A newtonian fluid is a fluid best defined by which one of the following:

its viscosity remains constant as shear rate changes

The shear strength of a metal is usually:

less than its tensile strength

Hardness is best defined as which one of the following:

resistance to permanent indentation.

The shear strength of a metal is commonly determined in which one of the following tests:

torsion test