stress strain curve explained with tensile test.
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- เผยแพร่เมื่อ 9 ก.ค. 2020
- stress strain curve explained with tensile test.
strain stress curve and mechanical properties. the curve is explained using a tensile test.
Stress and strain curve is a stepping stone to understand the properties of engineering materials. This curve is plotted for a variety of engineering materials during the tensile test. In this video, I will explain the stress and strain curve in a very easy way.
The basic terms explained are stress and strain curve.
stress and strain curve.
strain stress curve and mechanical properties
true stress and strain curve.
stress strain curve for steel
strain stress curve
stress strain diagram for brittle material
strain stress graph
stress strain diagram
Engineering stress and strain curve.
tensile strength
tensile strength test on a mild steel specimen
stress and Strain.
hook's law
hooks law 0:52 to 1.35
Youngs modulus 1:35 to 2:00
modulus of elasticity 1:35 to 2:00
modulus of elasticity
proportional limits
stiffer and stronger material
plastic deformation in the metal.
Yielding.
Yield strength.
yield point 2:03 to 2:34.
Strain hardening 2:34 to 2:57.
Ultimate strength 2:34 to 3:06.
ultimate tensile strength 2:34 to 3:06.
necking 3:06 to 3:21.
True stress.
Nominal stress.
true stress and strain curve.
strength of the material.
Engineering stress 3:40 to 4:04.
True stress and strain curve explained.
Some of the questions answered in this video about stress and strain curve are as follows
Mechanical properties of materials.
What is true stress. What is nominal stress.
True stress and strain curve.
What is Yield strength 2:03 to 2:34.
What is Tensile strength.
What is the proportional limit 0:53 to 1:31.
What is necking
What is the modulus of elasticity 1:35 to 2:00.
What is young’s modulus 1:35 to 2:00.
What is the ultimate strength 2:34 to 3:06.
What is strain hardening 2:34 to 2:57.
Why true stress higher than engineering stress 3:40 to 4:04.
Difference between true stress and engineering stress 3:40 to 4:04.
Why does a stress-strain curve decrease after reaching ultimate tensile strength 3:18 to 3:35.
What happens after ultimate tensile strength 3:18 to 3:35.
What is the tensile strength of steel.
what is hooks law.
Tensile strength test explained How do you find the ultimate tensile strength of a stress strain curve?
What is the relationship between stress and strain?
What is yield strength vs tensile strength?
What is meant by ultimate tensile strength? Why stress strain curve is important?
How do you calculate true stress? engineering stress vs. true stress?
What is engineering stress and the true stress.
Why does the stress-strain curve decrease?
Stress and strain curve
Stress and strain definition
What does a stress strain curve tell you?
What is the meaning of stress and strain?
How do you calculate stress and strain curve?
tensile strength test
Why stress strain curve is important? What is the yield strength formula?
What is stress strain curve for mild steel? Which stress strain curve is steeper? What is Young's modulus formula? Why does the stress strain curve decrease? What is the slope of stress strain curve? Why Young's modulus is important? Is Young's modulus the same as yield strength?
#tensile-test
#stress strain curve
#stress strain diagram
#tensilestrength
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This is exactly what I wanted to see, to be able to relate the actual test and curve instantaneously. Thank You!
So. True... So damn true
Quick note: at 1:45, the units of modulus of elasticity are not Newtons as the video labels-they are force per area, which can be Newtons/ sq. meter, or pounds/ sq. inch. This is the same units as stress since you're dividing by strain, which strain is unitless.
This is the video I was searching!
Thanks for making this very simplified for us.
Nice presentation of the stress and strain curve.
Only video that truly explains the stress -strain graph🔥
this helped a lot. Please make more videos in the future
sure. thanks
You've nicely explained everything in less than 5 minutes!
Thanks😊
Most simple way, easy to understand and with excellent clarity. Appreciated. Pls make video on optimum steam pipe sizing for saturated steam and condensate calculation.
Great Video Applications that is well explained. Thank You!
T J (Tom) Vanderloop, Author, Education-Consultant & Certified Manufacturing Engineer
Fully information and helped a lot, thanks
Firstly, this is a really good physics video on the stress formula. What I like about the Stress Formula is how you can use it to do so many different things. Furthermore, in this video you can identify what number to use as the stress variable in the formula. Because I was using yeld tensile stress and after watching this video I am going to start using ultimate tensile stress. The whole formula is really simple as well (Force ÷ Stress variable = cross sectional Area).
Table1 # Example:
Ultimate Tensile Stress=250MPa
Force = 50,000N = 5,098.6 kg
*F/s = A*
50,000N ÷ 250,000,000Pa = 0.0002m² = 2cm²
Therefore, if you have a 2cm² rod of 250MPa steel it will rip with 5 tonne of weight hanging off it.
It is great that you are interested in deepening your knowledge about solid mechanics.
In what kind of application do you require to calculate the stress of a material?
It is important to consider that yield stress is usually prefered do to warranty the reversibility of the strain, as well as the minimum distortion of the loaded component, otherwise, ultimate stress would be the best choice.
thanks, so helpful. Very good explanation
very well explained!! thanks
Best video about that I have ever seen
Entire 2 nd year preparation in 1 video thanks..
finally understood stress-strain curve thanks
I enjoyed this video, thanks mate ✌
This video is packed with great information! A few funny grammar thangs but you know, doesn't really matter....unless you want it to.
Best for quick revision with the experiment loved it 👍👍👍
Glad you liked it
Fantastic videos
Very helpful.. thank you so much .. i hope you add more like these
Clearly Explained
Good video.... you've earned yourself a like
superbly explanation
great explaination
Well explained
Nice explanation
superb 😍🤩
Very good 👍
well explained. Thank so much
will look like this *suggested videos block out graph*
other than that, good video :)
Love it
Beautiful way of teaching 😘
very good
by allah, one of the best
👍
Thanks for the video. One question, In order to get the Poisson Ratio and Youngs Modulus which tests are conducted? Is is Brazilian test, UCS test or Triaxial test?
👍👍
Thank u
My old job at the steel plant. 👌
Thanks
I swear I'd never understood it before!
thanksss
👍👍👍👍
What size samples are needed for the tensile test
Naice
With increase in the stress beyond proportional limit from B to see there’s considerable increasing in this strain and there is no much increasing in this stress this is because of the plastic defamation in the metal this phenomenon called yield point
What are advantages and disadvantages of tensile test
الحمد لله
What do you mean by true stress and strain curve at the end of the video? I mean once you've reached the Ultimate tensile strength you basically do not need anymore stress/force/lead to deform it until it breaks... Meaning reaching UTS it'll only takes less stress for the necking to appear. Right?
When load is applied on the object it's area reduces continously. However we take initial area to calculate stress. Therefore, true stress is calculated using actual area.
@@technoworks. how do you find the ultimate strength?
I'm guessing then for true stress you would need to have worked out a model for area as a function of the tensile extension, say A(x) where x is the extension, then find its instantaneous change dA/dx. Then the true stress would just be given by: (Applied Force) ÷ (dA/dx) write? This would then be a stress function with independent variable being the extension of the material.
What about upper and lower yield point
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The area is changing at different cross-sections. which stress is it talking about? the specimen breaks from the middle. so the stress is high in that area. you can see the area is changing drastically at that point. exactly which locations of the specimen the stress strain diagram represents and why?
Just as you have said, the diagram represents the central section where the rapid changes are seen. Probes are purposely design for concentrate the stress in the middle, otherwise failure and bigger distortions could present in other sections of the probe, thus rendering the test useless.
Does this depend in time?
The strain is a function of the stress level, the time for which the stress is applied, and the temperature.Time-dependent strain under constant stress is known as creep
If a material is stretched between point A and B, and before plastic deformation begins, will it return to it's original shape? This question is really hard to find an answer to. Thanks.
If we keep up with the theory, any strain until point B is elastic, thus completely reversible, being the particularity of the region between A and B, that it is no longer linear, meaning it is a lot harder to be modeled.
On the other hand, if we try to empirically verify all of this concepts, we will fail, because any real-world material has tolerances and manufacturing imperfections. This curves are gotten by exhausting experiments, statistics and modeling techniques.
Due to all I have mentioned, the yield stress is usually chosen for a design, warranting not failure and minimum distortion of the components.
@@wolfvash22 Good explanation, thanks for the reply!
@@Larry-cp3uy Thanks to you for reading. Just for clarify a point, when I said that we will fail if we try to verify the curve, I didn't mean that the theory it is not true, but rather that it is very hard to get results as exact or precise as the theory suggests.
Regarding the topic of yield strength for example (or any other point that seems to be perfectly defined in the curve), real-world materials tend to present such points as regions, meaning that is nearly imposible to perceive the exact moment when plastic strain begins.
why do we have 2 different stress strain curves though? the true curve makes much more sense. why do we use the other one at all
Why you stopped making videos, please make more, you are great
Sir I started sharing experience during covid time. Now I hardly get any time to prepare video. I will definitely start again.
@@technoworks. I am a student Sir. I am studying Mechanical Engineering at IIT in India. Your videos are great. If you get time, then please make more videos Sir
Wonderful explanation than most annoying talk creatures who talk more nonsens and less content
what happen to the substance when it reach the strain hardening point?
The metal must be plastically deformed to permanently change shape, and this deformation creates dislocations which increase the strength.The formation of dislocations requires a stress greater than the yield strength to be applied to the metal.
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Is it possible to the neck form two or more in a piece?????
no
area under O to B is the elastic region right?
Yes
Yes
@@technoworks. okay thank you! Another thing, does A to B still obey hooke's law?
@@sleepycorn349 no, there will be about 0.02 to 0.05% permanent deformation.
The video indicates as "Perfectly plastic" the phase from point B to C, but that is not correct, as there should be no increment at all in the stress if the behavior were not just plastic, but perfectly plastic. Furthermore, it is not correct that the yielding "starts" at point B. The yield process starts at the end of the elastic phase, so in point A. For materials as the one shown in the video, which do not show a perfectly plastic behavior after point A (like common instead for hot-rolled steel) point B is often taken to get the characteristic value of the steel strength. In this case, point P is the point corresponding to 0.2% residual deformation and not just a casual point between A and C. It is also not a point that indicate the start or the end of the yielding phase, but just a conventional point to have a common and well defined way of obtaining the steel strength for design.
Why stress in vertical axis ans strain horizontal axis? Have any physics behind this?
Please change d voice..otherwise d video is good.
SHOW ITS ON FUNDAMENTAL LEVEL OF UNIVERSE SO WE BWCOME MORE EASY TO HANDLE THE UNIVERSE
Where is the ultimate tensile strength at true stress curve?
What happens between A and B?
between A & B there will be plastic deformation. for more details watch this video th-cam.com/video/ayl_YQh8b_c/w-d-xo.html
@@technoworks. So the plastic deformation happening here seems to be of a different nature than the plastic deformation happening at later points in the curve. Where can I learn about the different types of plastic deformation happening? For instance, Maybe from A to B a bunch of crystals are being aligned or something, which leads to the hardening. And then the deformation at the last part may be just a matter of the cross-sectional area decreasing. I don't know. I'm just giving examples of what it might be.
Where is Upper and lower yielding point??
Subnautica pda???
Alevels anyone?
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Solid 🪨 . I like the video
👍👍