# Mechanical Properties and Behavior of Materials

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## 77 Questions

Poisson's ratio

Resilience

Toughness

Impact test

Fatigue

### What are mechanical properties?

Physical properties describing the behavior of materials under load

77 kg

### What is stress in relation to an external applied force?

Equal in intensity and opposite in direction to the applied force

Kilogram

### What do mechanical properties of a solid depend on?

Nature and strength of its atomic binding forces

### What is the equation for stress?

Stress = (force / area)

Tensile stress

### What is the modulus of elasticity?

A measure of rigidity or stiffness

### What is the proportional limit?

The greatest stress that a material can sustain without deviation from the proportionality of stress to strain

### What is Poisson's Ratio?

The reduction in cross section as a material elongates

### Which type of hardness test involves the use of an indenter in the shape of a ball, pyramid, or cone?

Brinell hardness test

### Which hardness test is suitable for measuring the hardness of small areas and very hard materials, such as gold castings and tooth structure?

Vickers hardness test

### Which hardness test was developed to fulfill the need for a microindentation test and can test the hardness of elastic materials without fracture?

Knoop hardness test

Dental amalgam

Hardness

### What is the measure of the amount of energy necessary to cause fracture called?

Fracture toughness

Impact test

Poisson's ratio

Ductility

Fatigue strength

Stress

Tensile stress

Yield strength

Flexibility

### What is the term for the constant relation between stress and strain?

Modulus of elasticity

### Which type of hardness test involves the use of an indenter in the shape of a blunt-point that tapers to a cylinder?

Shore hardness test

### In which hardness test is a hardened steel ball of special diameter pressed into a polished surface of a material under a specific load?

Brinell hardness test

### Which hardness tester uses a diamond square-based pyramid cone for measuring the hardness of small areas and very hard materials such as gold castings and tooth structure?

Vickers hardness test

Amalgam fillings

### Which stage of creep involves a transient or primary creep that tends to have a large effect?

Transient or primary creep

### What is the average biting force of a person with natural teeth on the posterior part of the mouth?

Approximately 1925 kg/cm2

Newton

### What is Poisson's Ratio?

The ratio of lateral strain to axial strain within the elastic range

Tensile stress

### What is the proportional limit?

The point beyond which the material will not return to its original shape when the load is released

Polymerization

### Which type of polymers are produced in the laboratory by chemical reactions?

Synthetic Polymers

Natural Polymers

Monomer

### Which type of polymers can be produced for medical use, such as dialysis and oxygenator membranes?

Synthetic Polymers

Natural Polymers

### What is the classification of polymers based on the spatial polymerization reaction called?

Spatial Polymerization

Thermal Spatial

### Which type of polymer can be reshaped by heat and maintains its shape after cooling, with polymer chains bonded by secondary bonds?

Thermoplastic polymer

### What type of polymer forms a network with cross-links and cannot be remelted or reformed into another shape?

Thermosetting polymer

Branched polymer

Benzoyl peroxide

Propagation

### What factor is associated with polymerization and results in a strong exothermic reaction due to breaking of bonds?

Evolution of heat

Inhibitor

### What property is characterized by increased strength, hardness, brittleness, and stiffness in longer chains and higher molecular weight polymers?

Degree of polymerization property

### Which factor affects the properties of polymers by influencing the number of branches and the cross-links between polymer chains?

Degree of polymerization

### What is the term for the internal resisting force that resists elongation or stretching in a body?

Modulus of elasticity

### Which type of polymer forms a network with cross-links and cannot be remelted or reformed into another shape?

Thermosetting polymer

Inhibitor

Molecular weight

### What is the classification of polymers based on thermal polymerization reaction called?

Thermosetting polymers

### In which type of polymerization does the reaction occur between two molecules to form a larger molecule without the elimination of a smaller molecule?

Condensation polymerization

Hardness

### What is the measure of the amount of energy necessary to cause fracture called?

Fracture toughness

### What is the term for the maximum stress that a material can sustain without deviation from the proportionality of stress to strain?

Proportional limit

Poisson's Ratio

### What is the classification of polymers based on the spatial polymerization reaction called?

Thermosetting polymers

### What is the term for the internal resisting force that resists elongation or stretching in a body?

Proportional Limit

### Which type of polymer chain shows higher strength, hardness, and less water sorption compared to linear polymers?

Branched polymers

Elastic Modulus

Resilience

### Which type of test is suitable for measuring the hardness of small areas and very hard materials, such as gold castings and tooth structure?

Knoop Hardness Test

### What is the term for an impurity in the monomer that can react with free radicals and inhibit or retard the polymerization reaction?

Polymerization Inhibitor

Toughness

### What is the classification of polymers based on thermal polymerization reaction called?

Test your knowledge of mechanical properties and behavior of materials with this quiz covering topics such as compressive loading, Poisson's ratio, ductility, and malleability.

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