Chapter 3

Which of the following are the three basic types of static stresses to which a material can be subjected (three correct answers):

(a) compression (d) shear (e) tensile

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

(a) elastic region

Which one of the following materials has the highest hardness:

Alumina Ceeamic

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

True streas

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

elastic and strain hardening

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

(b) diamond

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

(b) false

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

(c) perfectly elastic

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:

(c) the maximum load divided by the original area of the specimen

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

(d) Young's modulus

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

(d) strain hardening

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

False

The shear strength of a metal is usually

Less than its tensile strength

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

Metals

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

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

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

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

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 plastic

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

its viscosity remains constant as shear rate changes