Mechanical properties and testing of materials pdf

Different Mechanical Properties of Metals: 1. Strength: The ability of a material that can withstand to Mechanical load is called Strength of that particular material. A strength of the material depends upon the directions in which it is loaded. For example, Tensile Test. 3 3. Properties of materials We shall concern ourselves with three types of issues: (a) Mechanical properties of materials (strength, toughness, hardness, ductility, elasticity, fatigue and creep). (b) Physical properties (density, specific heat, melting and boiling point, thermal expansion and conductivity, electrical and magnetic properties) determining material properties many material properties can be determined from the results of a tensile test once the graph of force against displacement has been converted with equations1.2and1.3intooneofstressversusstrain.figure1.3bshowsthe stress-straincurveforatypicaltoughmaterial,suchasametal.likemany, but by no means all, materials, this … We select a material by matching its mechanical properties to the service conditions required of the component. The first step in the selection process requires that we analyse the application to determine the most important characteristics that the material must possess. Should it be strong, or stiff, or ductile? Why materials testing is required ? • To test mechanical properties like UTS, YS, % elongation etc. which is used as a design input. • Make informed choices in using raw materials. • To check properties of material after heat treatment. Introduction to Material Properties •New Focus on: -Fundamental information on the bulk properties of biomaterials -Basic level to enable understanding of metallic, polymeric, and ceramic substrates •In the next few classes we will cover: -Crystal structure -Stress-strain behavior -Creep, fracture, fatigue, and wear of materials Ductility is a property of a solid material which indicates that how easily a material gets deformed under tensile stress. Ductility is often categorized by the ability of material to get stretched into a wire by pulling or drawing. This mechanical property is also an aspect of plasticity of material and is temperature dependent. •mechanical properties determine a material's behavior when subjected to mechanical stresses properties include elastic modulus, ductility, hardness, and various measures of strength •dilemma: mechanical properties desirable to the designer, such as high strength, usually make manufacturing more difficult the manufacturing engineer should … The mechanical properties of a material affect how it behaves as it is loaded. The elastic modulus of the material affects how much it deflects under a load, and the strength of the material determines the stresses that it can withstand before it fails. The ductility of a material also plays a significant role in determining when a material Polymer components, like other materials, may fail to perform their intended functions in specific applications as a result of; 1.Excessive elastic deformation Particularly in structural, load-bearing applications, due to inadequate rigidity or stiffness. For such failure, the controlling material mechanical property is the elastic modulus. • Types of tests for determining the mechanical behavior of materials. • Elastic and plastic features of stress-strain curves and their significance. •