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The influence of Johnson-Cook parameters on Stress-strain graph and their requirements.
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- čas přidán 15. 08. 2024
- This video is for understanding the influence of JC parameters into the stress-strain graph.
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thx very helpful，save my life，thx
understood, and hence subscribed. Thanks
Hello Ms. Gayatri, I'm student 4th from HCM University of Technology and Education in Vietnam. Thanks for your video, this video was very helpful.
Thank you
good vdo , thank you
Recommendable video for beginners in research..Thank You
Thank you
Sister, great respect for you. Yu made it easy to understand.... Thanks
Thank you very much
Thanks for this video. 👍
Thank you so much! Easy to understand.
Thank you
Very thanks for your videos. It is very nice 👍
Thank you very much for watching my video.
The video was very helpful. Subscribed !
Thank you very much
Excellent.
Thank you
thank u it help me a lot
thank you very much
Thank you
Good Achievement.
Thank you
Can you also make a video about Mat Johnson Holmquist concrete ,?🤗
Nice vedio.
We need to found FRACTURE constant of Ductile material. Requested to help us
ASTM E1820 , Similarly, there are number of standard methods available. According to your model , you can follow them. Thank you
Hello mam,
Actually i have to defined Johnson cook damage constant values for steel 4340 in ansys but there is option of Johnson strength only but not for Johnson damage constant
Where the option shown, I mean which software
It's ok mam problem has sorted out
Can you please make a video on how to verify flow stress using Johnson cook model in FEM
As Johnson Cook has done some experiments on the wire and also calculated analytically for making the material model. But if your model is complicated then it will be difficult to verify analytically. As per my knowledge, through the experiments, It can be verify. I will try to make video on "how this material model generated". Thank you very much.
Madam can you make a lecture on Holmquist jhonson cook (HJC) model for brittle materials
Thanks such a nice video.
Same material like steel strength is different for static and dynamic loading. Is there any way to correlate static strength with dynamic strength.
Yes, there are lots of papers in which, they have done the high strain analysis for concrete material.
@@scienceandtechnologybygaya3535 thanks a lot!
Thank you
May you tell about what is the reason for higher dynamic strength of material than it's static strength.
This video is very helpful mam. Thank you for efforts in this direction. Mam can we used this model for creep analysis.
Yes, You can do the creep analysis by using JC parameters. The given paper for reference.
A Comparative Study on Arrhenius and Johnson-Cook Constitutive Models for High-Temperature Deformation of Ti2AlNb-Based Alloys
Mam what is the difference between Johnson cook and hashin damage material failure criteria?
damage material failure criteria used when material is having cracks, holes or any damage and then test it for high strain rate. Johnson cook is used for without any pre cracked material's high strain rate experiment data.
In short Johnson cook material failure criteria is applied for ductile materials and hashin damage is for composite materials
Is that correct?
Ma'am which other plastic model is suitable for reinforcement other than Johnson Cook Model..in case of dynamic explicit
Yes, There are more material models for concrete. I am giving you a link of a documents. It may help you.
www.iitk.ac.in/nicee/wcee/article/13_430.pdf
Nice lecture .
Why does true stresses decreases on increasing the temperature?
Thank you, Ayush for asking the question. As the temperature of any material is increasing, the bonding inside the atomic structure of the material will decrease. That time if you are giving any load either its impact or steady, yield stress of the material will decrease. If you keep on increasing the temperature up to the melting point of the material at that time, there is no need to apply any load it will fail definitely. I hope you got the point still if you are having any doubt please let me know. Sorry for the late reply.
@@scienceandtechnologybygaya3535 Thanks. I got it now.
Nice Video. By the way, I have a question. From where the temperature value we are getting in ansys. Is it heat conduction equation or something? Can you give me some link or references about this
Here, we are focusing on strain and stress of material under the high temperature conditions. So heat equations are not required here. In the description box, I have given some papers for reference.
@@scienceandtechnologybygaya3535 yes, but the temperature we are using in the Johnson cook model must be coming from somewhere. I was curious about that
The temperature parameter 'm' can find through the experiments. Which can be use in analysis. In the dynamic analysis, when you will put the material parameters. You go in the 'material properties' and choose 'plastic' and see is there any entry for J C parameters. I have used ABAQUS and Hyper Works for dynamic analysis. I will also try to check for ANSYS.
@@pranayanahak4708 That is depends upon your requirements. For example, you are design a car model. And you know at the time of accident, how much impact and heat will generate through some experiments. Material will behave in different way when it is in static condition and dynamic condition. Accordingly, you have to provide material properties. So, range of temperature and the range of strain rate depend on your requirement.
Ok Nice. But I was looking for the temperature 'T'. I know how to use JC in ansys. From where, it is getting the 'T' is important for me for the time being. Thats why I asked for that. However, the information about other parameters in your video is worth knowing.
Maam, how this equation help find the cutting speed of machining tools?
Thank you very much for watching my video. It can help to choose the material of machining tool which you are going to use at high speed. For example, you can see the variation of strain rate in primary shear zone at high cutting speed. Here, I am suggesting a paper in which you can get better idea. Paper title is "Strain, strain rate and velocity fields determination at very high cutting speed" from "Journal of Materials Processing Technology".
Ma'am, in the third term, the data obtained for different temperatures is measured at low strain rate or high strain rate?
Thank you for watching my video. Data obtained for different temperatures at low strain (reference strain rate).
@@scienceandtechnologybygaya3535 thank you ma'am.
Hello Gayatri, thanks for the good video, i have some stress-strain curves at different strain rates and i wonder if you can help me with generating Johnson cook material parameters and also damage parameters based on these curves? do you have an email i can contact you?