Bachelor of technology from IIT-Patna | Cracked GATE | Passion for Teaching

Rajashekar Janjarla

In this course Rajashekar is going to cover each and every topic in Design of Mechanical elements including example problems for the brief understanding of the concepts.

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English

Part 2: Design of Machine Elements GATE

Static And Fluctuating Load

Design of Machine Elements

Mechanical Engineering

GATE & ESE - ME & CH

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Course Overview

Permanent joinig processes and the types of welding

Welding Bonding and the Design of Non Permanent Joints

Welding Symbols

Types of joints. Stresses in the welded part of the joints

Butt and Fillet Welds

Stresses devoloped in the welds when the joint is under torsional loading.

Flillet Welded Joints Under Torsion

Stresses developed in the weld part of a cantilever beam. Second moment of area calculations. Total shear stress in the fillet weld.

Stresses in Welded joints in Bending

Example Problem on Stresses in Welded joints in Bending

Types of springs and the terminology used for Helical springs.

Mechanical Springs

The types of loading and stresses developed in the cross section of spring wire when the helical spring is under axial load.

Stresses in Helical Springs

Wahl factor. the deflection formula and the spring rate formula.

The Curvature effect and Deflections of Helical Springs

Types of ends conditions. Stability of helical springs, critical deflection and relation for safe length of the spring.

Compression Springs and the Stability of Springs

Design of helical spring against static loading

Design of Helical Springs for Axial Loadings

Surging in helical spring and Critical frequencies of helical springs under defferent end conditions.

Critical Frequency of Helical Springs

Endurance limit relations. The safe values of stress amplitude and mean stress of a spring under fluctuating loadings.

Design of Helical Springs against Fluctuating Loads

Types of loadings. Describing end location. Value of bending stresses in the helical coil torsion springs.

Helical Coil Torsional Springs

Deflections and spring rate of  helical coil torsion springs. Static strength and the spring rate in revolution units.

Deflection and Spring rate of Helical Coil Torsion Springs

Example problem for the calculation of permissible stress,Bending stress and the number of active coils in the helical coil torsion spring.

Example Problem on Helical Coil Torsion Springs

Introduction  advantages, applications and the terminology used in the design of concentric springs.

Concentric Springs

Calculating the magnitude of force transmitted by each spring in a concentric spring.

Design of Concentric Springs

Introduction to spiral springs. Design analysis of spiral springs. bending stress, angle of rotation and the deflection relations of spiral springs.

Spiral Springs

Solving an example Problem based on the concepts of spiral springs

Example Problem on Spiral Springs

Introduction to multi Leaf Springs and its application. Design of graduated length leaves of multi leaf spring.

Multi Leaf Springs

Deflections of graduated length leaves. Bending stress and the deflection of extra full length leaves of multi leaf springs.

Multi Leaf Spring Part 2

Relation for nip, force required to close the nip and the resultant stresses in the leaves.

Nipping of leaf springs

Calculation of initial nip, initial pre load and width of the leaf springs

Example Problem on Nipping of Leaf Springs

Introduction and advantages of belleville springs. Load deflection relations and load stress equations of belleville springs

Belleville Springs

Introduction to rolling Contact bearings and their properties.

Rolling Contact Bearings

Properties and importance of deep groove ball bearings, cylindrical roller bearings and angular contact bearings.

Types of Rolling Contact Bearings

Properties and advantages of self aligning bearings, taper roller bearings and thrust ball bearings

Types of Rolling Contact Bearings 2

Static Load Carrying Capacity and the derivation of the Stribecks Equation.

Static Load Carrying Capacity and Stribecks Equation

Dynamic Load Carrying Capacity,equivalent bearing load and the Rating life of bearings

Dynamic Load Carrying Capacity

The relation between dynamic Load Carrying Capacity, equivalent load and bearing life. Example Problem based on the relations.

Load Life Relationships

Calculation of equivalent load corresponding to Cyclic Loads and Speeds.

Design of Rolling Contact Bearings for Cyclic Loads and Speeds

Example Problem on Bearings under Cyclic Loads

The relation for reliability and Wiebull destibution. Relation between the Rating life and the life with reliability other than 90%.

Bearings with More Probability of Survival

Example Problem on Bearing Probability of Survival

Properties, applications and the advantages of needle bearings.

Needle Bearings

Types of bearing Failures and the Corresponding safety measures.

Bearing Failure

List of formulas from the Design of Rolling Contact Bearings.

GATE Formula Guide

Lubrication, types  of lubrication, applications of lubrications and advantages.

Lubrication and Journal Bearings

Viscosity, types of viscosity. Kinematic and dynamic viscosity.viscosity relations. Effect of temparature on viscosity of the lubricant.

Concepts of Viscosity

Petroff's equation and sommerfield number

Petroff's Equation

Hydrodynamic lubrication process, bearing characteristic number and Mckee's observations.

Stable Lubrication and Mckee's Investigation

Velocity profile of a lubricant passing through Rectangular slot. Maximum velocity and average velocity. Flow rate expression.

Viscous flow through Rectangular Slot

Types of energy Losses in Hydrostatic Bearings. Expression for power loss in pumping the lubricant and viscous friction of the lubricant.

Energy Losses in Hydrostatic Bearings

Example Problem on Energy Losses in Hydrostatic Bearings

Hydrodynamic lubrication.clearance,eccentricity, flow variable and eccentricity ration. The terminology used in hydrodynamic lubrication process.

Raimondi and Boyd Method

Heat generated by friction due to viscosity of the lubricant. And the heat carried away by the flow of lubricant oils. The expression for average temparature Rise of  lubricant.

Temparature Rise in Bearings

Design parameters such as length to diameter ratio, unit bearing pressure, terminology and type of bearings.

Bearing Design Selection Parameters

Bearing Design Selection of Parameters 2

Example Problem on design of hydrodynamic bearing

Example Problem on Bearing Design

Formulae in viscosity ,Petroffs equation  and McKees investigation ,viscose flow through rectangular slot ,Energy losses in Hydrostatic Bearings.

Gate Formula Guide Design of Machine Elements

Formulae of hydrodynamic lubrication ,heat generated in lubrication process according to different type of sliding contact bearings.

Gate Formula Guide Design of Machine Elements 2

Final year B. E Mechanical Engineering student about to pursue MS in the USA, vocalist, chess player


Karthik Balaji Keshavamurthi

It will be about bearings, it's principle, types and selection

Design of Rolling and Sliding Bearings for GATE

B.tech (Mechanical Engg.)

 | GATE & Engineering services aspirant |

Ayush Shrivastava

This course will cover complete syllabus of machine design and will be very helpful for semester exams.
It will help students to understand the use of databook.
shorttricks have been discussed so that data required could be found out in minimum time.

(Hindi) Machine Design using Databook for RGPV

Shubham Rajput

This course is all about the basics of Machine design which is considered as the important subject from GATE point of view and also apart from theory there will be a question related to that particular concept

Basics of Machine Design for GATE

ies prelims cleared
gate 2018 cleared
gate 2019 cleared
4 year teaching experience



Ravindra Lakhara

Full description  about design of machine element with funny conceptual tricky study.

Lessons

53 lessons • 7h 59m

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Course Overview

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Welding Bonding and the Design of Non Permanent Joints

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Welding Symbols

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Butt and Fillet Welds

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Flillet Welded Joints Under Torsion

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Stresses in Welded joints in Bending

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Example Problem on Stresses in Welded joints in Bending

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Mechanical Springs

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Stresses in Helical Springs

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The Curvature effect and Deflections of Helical Springs

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