Problem from Aircraft Structures for Engineering Students - 5ed

In summary, the conversation discusses a problem in an exercise book for aircraft structures and how to calculate the shear flow and moments in the beam cross-section. The equation for calculating the moments is Mx = Sx (Ixy/Ixx) and the equation for calculating the shear flow is qs,0 = -V/A.
  • #1
mobilesystem
1
0
Hello to all ,

I need your help again , if you can .

My question is about a problem / exercise book solved Aircraft Structures for Engineering Students - 5ed , example 20.4 .

So the problem this section supports a vertical load of 10kN and the objective is to calculate the flow section in FIG .

The areas of booms are: B1 = B8 = 200mm ^ 2 B2 = B7 = 250mm ^ 2 B3 = B6 = 400mm ^ 2 B4 = B5 = 100mm ^ 2

http://imageshack.us/photo/my-images/811/0u2h.jpg/

Solving we have:

The shear flow is given by :

http://imageshack.us/photo/my-images/35/f5m4.jpg/

But given that the section is symmetrical , the value of Ixy = 0 and as we have no strength x then Sx = 0, so the expression is :

 http://imageshack.us/photo/my-images/853/a1fe.png/

And Ixx = 13.86 * 10 ^ 4 ^ 6 mm

The above equation becomes:

http://imageshack.us/photo/my-images/577/v8dd.png/

Cutting the bar in section 23 , we can calculate the shear flow in the sections :

http://imageshack.us/photo/my-images/690/vrtl.png/

And now we have a serious problem :

I do not know how to calculate the moments that appear in the image below :

http://imageshack.us/photo/my-images/841/24i6.png/

The expected value of qs , 0 result is : qs , 0 = -5.4N/mm in the counterclockwise direction , as can be seen in the image below .

http://imageshack.us/photo/my-images/20/dzgi.png/

Things to know :
The value of 97200 refers to the internal area of ​​the figure :
The 2 refers to the symmetry of the bars and the rest do not know .

All help is welcome.

Hug and Thanks
 
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  • #2
</code>The moments that appear in the image are calculated using the equation: Mx = Sx (Ixy/Ixx), where Ixx is the second moment of area of the beam cross-section and Ixy is the product of inertia of the beam cross-section. The value of 97200 refers to the internal area of the figure, the 2 refers to the symmetry of the bars.To calculate the shear flow qs,0, we use the equation qs,0 = -V/A, where V is the vertical load applied to the beam and A is the internal area of the figure. Substituting the values for V and A, we get qs,0 = -10,000/97,200 = -5.4 N/mm in the counterclockwise direction, as can be seen in the image. Hope this helps!
 

1. What is the purpose of "Problem from Aircraft Structures for Engineering Students - 5ed"?

The purpose of this book is to provide engineering students with a comprehensive understanding of aircraft structures and their design principles. It covers a wide range of topics such as stress analysis, structural mechanics, and material properties, all of which are essential for designing safe and efficient aircraft.

2. Is this book suitable for beginners in the field of aircraft structures?

Yes, this book is suitable for beginners as it starts with the basics of aircraft structures and gradually builds upon them. It also includes numerous examples and practice problems to help students develop their understanding and problem-solving skills.

3. Are there any real-life applications discussed in this book?

Yes, this book discusses various real-life applications and case studies of aircraft structures, such as the design and analysis of wings, fuselage, and landing gear. It also includes examples of structural failures and their causes, which can help students understand the importance of proper design and maintenance.

4. Are there any updates or revisions in the 5th edition of this book?

Yes, the 5th edition of "Problem from Aircraft Structures for Engineering Students" includes updates and revisions based on the latest research and developments in the field of aircraft structures. It also includes new chapters and expanded content on topics such as composite materials and structural testing.

5. Can this book be used as a reference for practicing engineers?

Yes, this book can be used as a reference for practicing engineers who want to refresh their knowledge of aircraft structures or learn about new developments in the field. It contains comprehensive and up-to-date information, making it a valuable resource for engineers working in the aerospace industry.

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