I am an enthusiast and always has the will to take up any challenges.
I completed my B.E. from VTU and is currently pursuing Mtech from KTU.

Joel George

The course will be giving a basic idea about various properties of materials like chemical, physical and thermal properties. Further classification of these properties are also studied deeply giving special preference for mechanical properties of material. The significance of material properties and relevance while doing an analysis is also discussed in this course. The effect of various mechanical properties on the stress and strain acting on the material is tutored with proper and neat explanations. Stress and strain diagram is discussed with different valid points on it which is significant in determining various mechanical properties like toughness, strength. Various points on this stress and strain curve is important in many material studies.

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English

Basics of Mechanical Engineering

Mechanical Properties of Material

Strength of Material

Mechanical Engineering

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This lesson provides an overview of various properties like physical, chemical, mechanical and manufacturing. The effect of these properties in determining the optimum material for a specific application is also discussed in this lesson. Various points to be remembered during material selection process is explained briefly. A short description about hot working process and cold working process is discussed along with its recrystallization temperature. Effect of manufacturing properties and economical value of the component is discussed. Material selection criteria for die casting and welding is also discussed in this lesson. Various properties like ductility and strength are discussed and also the effectiveness of these properties is differentiated when the same metal is hot worked and cold worked.

Basics of Material Properties

The importance of physical properties is as much important as mechanical properties when it comes to material selection and manufacturing. Various physical properties will be affecting the aesthetics and ergonomic considerations of materials. These considerations are to be made with reference to physical properties. The importance of these physical properties will be reviewed in this lesson. Machining capabilities for different materials is different depending upon the physical properties. Indirectly, physical properties play an important role in determining the application of material along side with mechanical properties. Different physical properties like density, melting point and boiling point of material plays an important role in determining the abilities of the material to change its phase. Different other physical properties like thermal conductivity, thermal expansion, electrical conductivity and corrosion resistance explains the application of different materials in different situation.

Physical Properties of Materials

Basics of mechanical properties include a study about stress and strain, how are these terms defined theoretically as well as experimentally. The concepts of stress and strain are very much important in understanding the load versus elongation curves.The importance of tensile testing and the machine used to test the tensile properties of materials are also discussed. The size, shape and the loading condition for various specimens play an important role in interpreting the results of tensile testing. The fundamental difference between true stress and engineering stress, true strain and engineering strain are discussed in this lesson. The impact of overall area and instantaneous area for determining true and engineering stress and strain is significant. The graphical representation of stress versus strain considering to cases I.e. true stress and strain versus engineering stress and strain is plotted.

Introduction to Mechanical Properties and Terminologies

Stress strain curve or stress strain diagram is an important topic in almost every syllabus across the globe. The importance of stress and strain diagram is vast. The relationship between stress and strain is depicted from this curve. The validity of Hooke's law under the the elastic limit is discussed briefly in this lesson. The invalidness of the same under plastic region is also discussed in this lesson. Various points on stress and strain diagram like elastic limit (El), proportionality limit(Pl), yield stress(yield point) and ultimate tensile strength point are discussed briefly in this lesson. Different phases of material deformation when subjected to tensile testing is discussed with proper images and explanations. The different stages of deformation are elastic region, uniform strain, Necking and finally fracture of specimen. The crack propagation while neckoing and the end effect of this cracking is also discussed in this lesson.

Stress-Strain Diagram and its Terminologies

Various elastic properties of materials play an important role in categorizing materials. From the previous lesson we understood the exact meaning of elastic region and plastic region. From these regions we can derive the elastic modulus, shear modulus which is related to shear stress and shear strain and also Poisson's ratio. The relation between these three factors is very much important while we are solving problems in many competitive examination. This relation helps us to understand the link between dimension changes and normal as well as shear stress and strain. A prominent property of material called An elasticity is discussed briefly in this lesson. The effect of strain and work hardening on anelastic property of material is explained briefly. Ductile and brittle fracture is explained with the help of neat graphs in this lesson.

Elastic Properties of Materials

Tensile properties are obtained by applying uniaxial stress in opposite direction but that is not the case in compressive testing and shear testing. Compressive and shear testing is done to obtain the compressive and shear properties of the material. Compressive properties of concrete is to be satisfactory or else it might cause fatal accidents. Shear properties are considered in cases where torsion occurs like in the case of shafts of automobiles or machineries. These properties play an important role in determining the overall performance or overall efficiency when applied to a specific condition. The effect of creep and various stages of creep is also explained with the help of proper and neat sketches. The strain rate at primary stage creep is rapid but tends to be constant as it moves to secondary stage. At the third stage of creep there is a development of necking in material which results in the reduction of area of cross section. This thereby results in the increase of strain rate.

Non-tensile Properties of Materials

Two of the most prominent mechanical properties are resilience and toughness. The ability of the material to absorb energy or stresses in elastic region is called as resilience. Whereas, the ability of material to absorb shock and stresses in elastic region is called as toughness. The features of resilience is very much important while selecting materials for specific applications. The toughness property of a material finds application where ocassional loading or stresses are developed. Different classification of toughness like impact toughness, notch toughness and fracture toughness are discussed in this lesson. The importance of performing Charpy and Izod test are discussed briefly in this lesson. The impact toughness test plays an important role in understanding the relevance of the material while under impact loading. Notch toughness test is done to materials or specimens that have a flaw. The toughness of these king of specimen is comparatively very low. The different classification of fracture toughness is also discussed briefly in this lesson.

Resilience and Toughness

Hardness of the material is the ability of the material to resist indentation, penetration or scratch. Hardness is one of the prominent mechanical property when it comes to specific applications like using carburized steel in machine building operations. The hardness of material can be determined by conducting various hardness test. Mohs hardness scale for many minerals are also discussed in this lesson. Rockwell hardness test, Brinell hardness test and Vickers hardness test are the different test procedures used to determine hardness of a material. The usage of diamond and steel ball indenters in various hardness test are also discussed in this lesson. The various scales in which hardness of a  material can be determined is also discussed in this lesson. The application of minor load and major load with its generalized concept is discussed in this lesson. Hardness test with the help of optical microscope is done for specimens of small size. Microhardness test is very much efficient in determining the hardness of small specimens.

Hardness and Different methods of determining the Hardness of Material

I am M Tech from COEP. I have 2 years of teaching experience in Mech Engg. Currently I am trainer in Infosys (Mech Stream).
I love to teach.

Rahul Muthal

This course will guide the students to prepare for Material Science subject. Which will help them in their GATE, IES and other competitive exams preparation for Material Science subject.
This course will also help the students, who are preparing for their university exam of Material Science subject.
In overall this course will help in enhancing the basic concepts of Material Science and knowing interesting relevance of different materials properties and their behaviour.

(Hindi) Material Science for GATE and competitive exams

Hi this is chandrasekar KL, I have worked at Reckitt Benckiser india at hosur for 1.5 years

Chandrasekar Kl

This course explains about classification, specification, motions, control, path generated,, need and application.

Introduction to Robots and Fundamentals: Part - 2

UNACADEMY TOP EDUCATOR 2017
Sr. Physics faculty in Motion Education , Kota
Teaching experience of more than 6years .

Sanjeev Tiwari

Shear and bending moment diagrams are analytical tools used in conjunction with structural analysis to help perform structural design by determining the value of shear force and bending moment at a given point of a structural element such as a beam. In this Course, Sanjeev has made an effort to explain all the possible Shear force and bending diagrams of the beam because of loads and moment acting on it. Tags: Shear force and bending moment, Shear force and bending moment diagram examples, How to draw shear force and bending moment diagram, Shear force and bending moment diagram for cantilever beam, Shear force and bending moment diagram solved examples, Shear force and bending moment diagram for fixed beam, Shear force and bending moment diagram for uniformly varying load, GATE preparation.

(Hindi) How to Draw Shear Force and Bending Moment Diagrams

I am Saurav Kumar.I was lecturer in BITT polytechnic Ranchi and have experience of 2 year in teaching.

Saurav Kumar

Gate previous question discussion is done in this course

Lessons

8 lessons • 1h 31m

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Basics of Material Properties

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Physical Properties of Materials

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Introduction to Mechanical Properties and Terminologies

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Stress-Strain Diagram and its Terminologies

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Elastic Properties of Materials

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Non-tensile Properties of Materials

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Resilience and Toughness

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Hardness and Different methods of determining the Hardness of Material