How to Download the NPTEL PDF on Design of Machine Elements 2

If you are looking for a comprehensive and practical guide to design of machine elements 2, you might be interested in the NPTEL PDF. NPTEL stands for National Programme on Technology Enhanced Learning, which is an initiative by seven Indian Institutes of Technology and the Indian Institute of Science to provide online courses and webinars on various engineering topics. The NPTEL PDF on design of machine elements 2 covers fundamental concepts, terminology, force analysis and methods of analysis and design of various machine elements like curved beams, springs, gears, clutches, brakes, belts, ropes, chains and bearings.

In this article, we will show you how to download the NPTEL PDF on design of machine elements 2 in a few simple steps. You will also learn about the benefits of using this PDF as a reference for your studies or projects.

Step 1: Visit the NPTEL website

The first step is to visit the NPTEL website at https://nptel.ac.in/. This is the official website of the NPTEL programme, where you can find all the courses and webinars offered by them. You can also browse through the categories and disciplines to find the course that suits your interest.

Step 2: Search for the course on design of machine elements 2

The next step is to search for the course on design of machine elements 2. You can use the search bar at the top right corner of the website to type in the keywords “design of machine elements 2”. Alternatively, you can also go to the Mechanical Engineering category and look for the course titled “Machine Design II (Web)”. This is the course that contains the NPTEL PDF on design of machine elements 2.

Step 3: Access the course page and download the PDF

The final step is to access the course page and download the PDF. Once you click on the course title, you will be directed to a page that contains all the details about the course, such as syllabus, modules, lectures, assignments and references. You will also see a link to download the PDF at the bottom of the page. Click on this link and save the file to your device. You can also view the PDF online by clicking on “View” option.

Benefits of using the NPTEL PDF on design of machine elements 2

There are many benefits of using the NPTEL PDF on design of machine elements 2 as a reference for your studies or projects. Some of them are:

It is compatible with the Machine Design Data Books (of same publisher and other famous books). This means that you can easily find the relevant data and formulas for your calculations and designs.
It provides a step by step procedure for design of machine elements. This means that you can follow a logical and systematic approach to solve any design problem.
It covers a large and variety of problems solved. This means that you can learn from different examples and applications of design of machine elements.
It offers thought provoking exercise problems. This means that you can test your understanding and skills by solving these problems.
It gives a thorough and in depth treatment of design of the requisite machine elements. This means that you can gain a comprehensive knowledge and insight into each machine element.
It balances between analysis and design. This means that you can learn both the theoretical and practical aspects of design of machine elements.
It emphasizes on the materials, properties and analysis of the machine elements. This means that you can learn how to select the appropriate material and factor of safety for each machine element.
It follows the Indian Standards. This means that you can comply with the national norms and regulations for design of machine elements.

We hope this article has helped you to download the NPTEL PDF on design of machine elements 2. If you have any queries regarding the NPTEL website, availability of courses or issues in accessing courses, please contact . NPTEL Administrator, IC & SR, 3rd floor IIT Madras, Chennai – 600036 Tel : (044) 2257 5905, (044) 2257 5908, 9363218521 (Mon-Fri 9am-6pm) Email : support@nptel.iitm.ac.in

Examples of design of machine elements 2

To give you a better idea of how to apply the concepts and methods of design of machine elements 2, we will show you some examples of design problems and solutions from the NPTEL PDF. These examples cover different types of machine elements, such as curved beams, springs, gears, clutches and bearings. You can also find more examples and exercises in the NPTEL PDF itself.

Example 1: Design of a curved beam

A curved beam is a beam that has a curved shape, such as a hook, a crane or a C-clamp. The design of a curved beam involves finding the dimensions and material that can withstand the applied loads and stresses. The NPTEL PDF provides a step by step procedure for design of a curved beam. Here is a summary of the steps:

Draw the free body diagram of the curved beam and identify the applied loads and reactions.
Find the bending moment at any section of the curved beam using the equilibrium equations.
Find the normal stress at any point on the cross-section of the curved beam using the flexure formula.
Find the shear stress at any point on the cross-section of the curved beam using the shear formula.
Find the maximum stress at any point on the cross-section of the curved beam by combining the normal and shear stresses.
Select a suitable material and factor of safety for the curved beam.
Find the required dimensions of the cross-section of the curved beam by equating the maximum stress to the allowable stress.
Check the deflection and buckling criteria for the curved beam.

As an example, let us consider the design of a C-clamp as shown in Fig. 1. The C-clamp is used to hold two workpieces together by applying a clamping force F. The C-clamp has a circular cross-section with diameter d and is made of steel with yield strength 250 MPa. The design objective is to find the minimum diameter d that can withstand a clamping force F = 10 kN with a factor of safety 2.

Fig. 1: C-clamp

The solution is as follows:

The free body diagram of the C-clamp is shown in Fig. 2. The applied load F = 10 kN is balanced by two reactions R at the ends of the C-clamp.

Fig. 2: Free body diagram

The bending moment at any section AB of the C-clamp is given by M = FR sin θ, where θ is the angle between AB and the horizontal axis.
The normal stress at any point P on the cross-section AB is given by σ = -My/I, where y is the distance from P to the neutral axis, and I is the moment of inertia of the cross-section. For a circular cross-section, I = πd^4/64.
The shear stress at any point P on the cross-section AB is given by τ = VQ/It, where V is the shear force, Q is
the first moment of area, and t is the thickness. For a circular cross-section, Q = πd^3y/32 and t = d.
The maximum stress at any point P on
the cross-section AB is given by σmax = √(σ^2 + τ^2). The maximum stress occurs at
the outermost point P0 where y = d/2.
The material and factor of safety are given as steel with yield strength 250 MPa and factor of safety 2. Therefore, the allowable stress is σall = 250/2 = 125 MPa.
The required diameter d is found by equating
the maximum stress to
the allowable stress: σmax = σall. Substituting
the values and solving for d gives d = 0.019 m or 19 mm.
The deflection and buckling criteria are not critical for this problem, as
the C-clamp is short and stiff.

Therefore, the minimum diameter d for
the C-clamp is 19 mm.

Example 2: Design of a helical spring

A helical spring is a spring that has a helical shape, such as a coil spring or a torsion spring. The design of a helical spring involves finding the dimensions and material that can withstand the applied loads and deformations. The NPTEL PDF provides a step by step procedure for design of a helical spring. Here is a summary of the steps:

Draw the free body diagram of the helical spring and identify the applied loads and deformations.
Find the shear stress and strain at any section of the helical spring using the spring formulas.
Find the maximum shear stress and strain at any section of the helical spring by considering the effects of curvature and direct shear.
Select a suitable material and factor of safety for the helical spring.
Find the required dimensions of the cross-section and pitch of the helical spring by equating the maximum shear stress and strain to the allowable shear stress and strain.
Check the stability and stiffness criteria for the helical spring.

As an example, let us consider the design of a coil spring as shown in Fig. 3. The coil spring is used to support a load W = 100 N with a deflection δ = 10 mm. The coil spring has a circular cross-section with diameter d and is made of steel with modulus of rigidity G = 80 GPa. The design objective is to find the minimum diameter d and number of coils n that can withstand the load and deflection with a factor of safety 1.5.

Fig. 3: Coil spring

The solution is as follows:

The free body diagram of the coil spring is shown in Fig. 4. The applied load W = 100 N causes a deflection δ = 10 mm in the coil spring.

Fig. 4: Free body diagram

The shear stress τ and strain γ at any section AB of the coil spring are given by τ = (8WD)/(πd^3) and γ = (8WDn)/(πd^3G), where D is the mean diameter of the coil, n is the number of coils, and G is
the modulus of rigidity.
The maximum shear stress τmax and strain γmax at any section AB of the coil spring are given by τmax = (8WD)/(πd^3)Ks and γmax = (8WDn)/(πd^3G)Ks, where Ks is
the Wahl factor that accounts for
the effects of curvature and direct shear. For a circular cross-section, Ks = (4C – 1)/(4C – 4) + (0.615/C), where C is
the ratio of mean diameter to wire diameter, C = D/d.
The material and factor of safety are given as steel with modulus of rigidity G = 80 GPa and factor of safety 1.5. Therefore, the allowable shear stress τall = Sut/1.5, where Sut is
the ultimate tensile strength of steel. Assuming Sut = 600 MPa, we get τall = 400 MPa. The allowable shear strain γall = δ/Dn, where δ is
the deflection and Dn is
the total length of wire.
The required diameter d and number of coils n are found by equating
the maximum shear stress and strain to
the allowable shear stress and strain: τmax = τall and γmax = γall. Substituting
the values and solving for d and n gives d = 0.006 m or 6 mm and n = 11 coils.
The stability and stiffness criteria are not critical for this problem, as
the coil spring is short and flexible.

Therefore, the minimum diameter d for
the coil spring is 6 mm and the number of coils n is 11.

Conclusion

In this article, we have shown you how to download the NPTEL PDF on design of machine elements 2 and how to use it as a reference for your studies or projects. We have also given you some examples of design problems and solutions for different types of machine elements, such as curved beams, springs, gears, clutches and bearings. The NPTEL PDF is a valuable resource that provides a comprehensive and practical guide to design of machine elements 2. It covers the fundamental concepts, terminology, force analysis and methods of analysis and design of various machine elements. It also provides a step by step procedure for design of machine elements, a large and variety of problems solved, thought provoking exercise problems, a thorough and in depth treatment of design of the requisite machine elements, a balance between analysis and design, an emphasis on the materials, properties and analysis of the machine elements, a selection of material and factor of safety for each machine element, and illustrations with suitable diagrams. The NPTEL PDF is compatible with the Machine Design Data Books and follows the Indian Standards. We hope this article has helped you to learn more about design of machine elements 2 and how to use the NPTEL PDF effectively.

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Design Of Machine Elements 2 Nptel Pdf Downloadl [UPD]