Відео

Then you need to look at bolt pattern analysis. Plenty of online examples and youtube videos exist on that.

Glad it was useful. Please subscribe and tell your friends about the channel & website as well.

That is a very good point and thanks for your comment. Waterline, Buttline, Starboard, Port, Fwd and Aft etc. are all still used in the industry taken from the ship building industry.

It depends on the support. It may be another heel toe situation.

@@stressebookllc Can you please explain further? I see that no fasteners in the vertical leg of the bracket are considered in the video. Would be helpful if you can share some insight on combined effects on fasteners in both vertical and horizontal legs of the bracket. Thanks.

@@iqrachoudhry8768 Essentially it would be a reverse case of the vertical load on vertical leg video. The horizontal would act as the vertical leg in your case, while the fasteners on the vertical leg would be treated the same way. The horizontal leg could be assumed to react load in pure shear of fasteners, then pure bearing of the fastener holes. It all boils down to the correct FBD to balance all applied loads and moments.

Bottom line, its all vertical, meaning it is a double "vertical load on angle bracket" FBD. Balance the forces and moments and you will see. Reply here what you found.

It is simply a matter of static equilibrium. You will need to work out the individual FBDs using force and moment balance, and then use force summation. Check out the video with load along X for that FBD.

Ich, please watch this: ua-cam.com/video/fLf3g7I1nVw/v-deo.html. But if this thing is thin enough, Py would make it more of a shear clip, check these out: www.stressebook.com/angle-bracket-sizing-stress-analysis/ or www.stressebook.com/shear-clip-freebody-diagram-fbd/

www.ecfr.gov/, title 14 is for aeronautics and space. For repair station use 14 CFR Part 145, www.faa.gov/hazmat/air_carriers/operations/part_145/. By the way all of this is available with a google search,

@@stressebookllc Many thanks. Keep up the good work and good luck!

Please elaborate, not clear what you are trying to ask.

Thank you for this video,it's informative

The regulation you mentioned is about fire protection, our videos are all about structures. Sorry!

Not sure what you mean, but if it helped you in any way, then that's a good thing.

The key is conservatism. You should definitely use it when the applied load is up and its a thin bracket. In other cases, Rht the way it is in this video gives you a more conservative answer, but only within reason. You need to sharpen your pencil if you have a negative margin as a result.

Thank you for your kind words. A safety factor of 3 is overweight in the aerospace industry, maybe even obese. You can check this post for conservatism in the industry: www.stressebook.com/conservatism-in-stress-engineering/

Think of the core as the web of an I-beam, that I-beam web (core) is vertical, I-beam caps (skins) are horizontal.

@@stressebookllc Thanks for your reply! It seems that my question was not so clear described... Sorry for that. I meant the core ribbon direction. If we take rectangular panel, the most rational way to orient core is to put ribbon direction along the short edge. Beam analogy for honeycomb panels is clear for me, but the question more about in-plane core orientation. Really appreciate if you can explain this effect!

@@ivanagafonov3455 It depends on the manufacturing process. But it also depends on the panel cut. This is why you have both L and W core tests to determine the allowable core shear stress. Check these: www.stressebook.com/sandwich-panel-long-beam-and-short-beam-tests/ and www.stressebook.com/sandwich-panel-flexure-and-core-shear/. Good questions though.

If there is room to be conservative, use only the two inner fasteners to show positive margins.

The reaction load must be divided by two at the end for each fastener, the video shows total reaction. Good catch.

Its possible some applications use a similar process but cannot comment on that

@@stressebookllc very interesting stiff, thank you

@@bluewanderer9903 You should check out the available courses at www.stressebook.com/courses

You are now getting into large displacements, which means you have much bigger problems now in your structure elsewhere which need to be fixed. These angle brackets are not intended for such applications. Small displacements is the key, like very small.

Because that is where that centroid of the triangular, linearly increasing distributed load lies.

Thank you for the reply.

Richard, your comment is appreciated, but its lacking any more explanation that justifies it. Kindly post some more details on how it can be improved? Thank you.

Sounds interesting, assuming the bond is as strong as ultrasonic welding, the 'W' direction weakness is primarily due to lack of material continuity. This blogpost goes into a little more of that: www.stressebook.com/sandwich-panel-flexure-and-core-shear/

The applied moment is the normal distance from the applied load to the bottom, hence the vertical distance 'y'. It is about 'Z' axis, and usually assumed to be at the bottom of the fastener axis.

Various, www.thegillcorp.com/home.php?cPath=38_23

he is saying that y=4 is typo error right?

@@vishwanathasetty01 Correct.

Good catch, see reply below.

That would be the same as a shear clip, remove Pz and all reactions due to Pz in this video, you will be left with Rx1, Rx2, Rz1 and Rz2.

The total reaction load calculated can be split equally among the two base rivets in this case.

Thanks

Here is an example: ua-cam.com/video/GD5ltW_rTm8/v-deo.html, or ua-cam.com/video/qLjmEj9cfQo/v-deo.html

many thanks for your reply, i am spiral paper tube core maker , i am interested to form honey comb paper sheet for the packaging purpose honey comb structure has very good compresive strength to bare heavy load , but strength of cell play important role , i may request you again can u guide me for honey comb paper core ex pander, many thanks for your reply

Hello Naresh, there are many videos on youtube for packaging honeycomb core machines, here is an example with better commentary. ua-cam.com/video/GpC2R9Bc1bw/v-deo.html

hello sir u r right i have refer some of them but in small scale development i need to find easy operation in small scale model production

Hello Sajan, the point of doing this hand calculation is to avoid FEM for problems like these. Hope this helps.

Thanks for the wonderful feedback. If you add two additional fasteners closer to the vertical leg on the horizontal leg, assuming they are co linear with the existing fasteners (or not), basically you are reducing the applied moment arm. At the same time you are also increasing the heel toe moment arm. The larger the heel toe moment arm the lower the heel toe reaction load will be, thereby effectively reducing overall fastener loads. The heel toe moment arm will now be 2/3rd the distance from the new inner fasteners. The previous outer fasteners can be assumed to effectively do nothing as the new pivot is about the inner fasteners.

Thanks for your prompt response. I apologize for the confusion, but i meant to say adding two holes on the vertical plate. The end result would be two holes on the horizontal plate ( like this video) and adding two holes on the vertical plate. Thanks

Good question. In that scenario, the top can be considered guided, hence the bottom will not see no heel toe. The top fasteners now will see heel toe, and the problem becomes the same as in this video (it is akin to switching loading to the reaction on the horizontal leg): ua-cam.com/video/bIlnoC_Ki_o/v-deo.html

We hope you liked the video too... :)

The processes are automated to the extent they can be. One of the major US manufacturers is Hexcel, check their website for more information.

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Aramid "NOMEX" fiber was originally developed by Dupont for fire resistant applications. Following that, it was also adopted in the aerospace industry to meet FAA flammability requirements. www.dupont.com/products-and-services/personal-protective-equipment/nomex.html

Thanks Blast Waves. The reverse direction is tricky, but in general, people assume a linearly increasing triangular reaction under the bottom face. It goes from zero at the fastener and maximum at the right corner, similar to heel toe but the other side of the fastener. And then there is only the fastener reaction, no heel toe to the left of the fastener. This force couple balances the moment.

New video uploaded with this load case...

Sure thing. Hope you can share it with your friends. Also, if you want real world knowledge then you might want to invest in the paid courses on the site. Free stuff will only go so far.