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Stresses at Screw Threads in Just Over 10 Minutes!
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- เผยแพร่เมื่อ 16 ส.ค. 2024
- Stripped Screw Threads,
Stress at Critical Location of Screw Threads.
0:00 Screw Failure
1:16 Threads Free Body Diagram
2:09 Axial Stress
2:31 Bending Stress
4:10 Direct Shear Stress
5:26 Torsional Stress
6:11 First Engaged Thread Load
7:15 Von Mises Stress
8:23 Thread Stress Example
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this video is amazing, you are out here doing savior's work
You are currently saving me and my CAD coursework
ty and god bless
Your illustrations are great!
Great explanation. Just what I needed. Thanks
I barely leave any comment in any video, but you are awesome
Just love your explanations, wish Shigleys or any other book gave such detailed explanation. Does this apply to metric threads too?
Yup! The only difference between metric and english is the nomenclature: for example, M2 × 0.4 mm (metric) means 2 mm nominal diameter with a 0.4 mm pitch. A 3/16"-56 (english) means 3/16-in. nominal diameter and 56 threads per inch.
@@LessBoringLectures thanks for answering, hope yt algorithm recommends you to much more people, you deserve far more subscribers.
Excellent explanation!
Thanks!
Great video! However, the 10 min video really covers entire semester of classes... kind wish there is an extended version for ppl who is rusty with this topic, i would watch a 40 min video on this for sure.
Great video and I really like the stressed areas representations! My question for you: For von Mises stress calculation, why are you considering 4 stress components while Shigley's is only considering 3; or why Shigley's not considering the thread pure shear stress tauZX in their root stress analysis? Thank you
I am guessing that the formulas also apply to internal threads (subbing in minimal thread spec values for worst case)?
Could you, please, check again the calculations of the shear stresses at almost the end of the video (tau yz and tau zx) or the given value for the torque (T)?
Thanks for the video.
Can this be applied to threads of different geometries, such as V-shaped threads?
Great video! Will you share the notes?
This video is amazing, Thank you.
Are the formulas applicable for ACME threads as well?
Thanks!!!
How will I can know how much engagement I have in triple starts?
the textbook (Shigley's 10th ed.) sets the shear stress in xz plane to zero, why ?
what the book u used to reference that formula?
9:42
Transverse shear stress will equal to zero when the bending stress is maximum.
So how did you combine these two stresses ?
You are right: but no transverse shear was considered here. Only direct shear.
I love you :')
Sir let us say you want to calculate the maximum force the threads can withstand but you are neither given a torque nor any force, only the material properties with which the bolt is made of are available to you and the thread type with its dimensions, How can you go about calculating it?
With the yield strength of the material of the screw, you can find the maximum allowable von Mises stress at the threads (Sy = σ', if factor of safety is 1). With the maximum von Mises stress you can either solve for the force/torque combination (they are related, like you see in this video) analytically (very long process), or try different forces (in a MATLAB script or EXCEL spreadsheet), increasing them gradually until the von Mises stress reaches that value.
Damm, why I didn't see this explanation before???
Hello Sir, could you help me understand why the expressions at 7:14 are only valid when the number of engaged threads are six or more.
When 6 threads are engaged, the first engaged thread takes roughly 38% of the load. If there are fewer threads, this number would be higher. For example, if there's only 1 engaged thread, the number would be 100% of the load.
@@LessBoringLectures Thanks alot
Does torsion shear stress and axial stress affecting the hole power screw ? or only the free region ?
They are found in the region between the external load and the engaged threads.
First engaged thread of screw is it nut right
Yup