In this video I introduce the relaxation modulus, showing time-dependent stress-relaxation. I also introduce the glass-transition temperature and the melting temperature.
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@rez8o3527 ай бұрын
you've proven that not everyone can deliver this kind of information as logical and clear as you just did. you have my gratitude sir
@manolorios89274 жыл бұрын
I’m a PhD student, and you just saved my life.
@RZ-mo5qb5 жыл бұрын
awesome explanation fullfilling my PhD course lol
@Boris-sq2us4 жыл бұрын
This is explained perfectly. Getting ready for my PhD comprehensive exam and this just saved me a ton of time. Thank you.
@ScottRamsay4 жыл бұрын
Good luck on your exam!
@parastooaghr4 жыл бұрын
Thank you veeeeeeeeery much
@marinacastro18225 жыл бұрын
Thank you very much again!
@RZ-mo5qb5 жыл бұрын
how ya doing
@marcowen15063 жыл бұрын
nice, clear video. You say divit, I say divot.
@zahramollazadeh94322 жыл бұрын
hi . this course was very helpful for me. great job and tnx a lot
@sahandsoltanieh51864 жыл бұрын
awesome thank you!!
@diejer47117 жыл бұрын
very informative intro for a rookie, thx.
@HazimEng8 жыл бұрын
hi Can you tell me how to fit the strain data of a viscoelastic material obtained from creep test by prony series
@SuperSlainer3 жыл бұрын
Thanks for the video 👌 Sigma (t), is this the difference in stress from as soon as the given strain is reached to the point where it no longer changes?
@furkansalihkuk4 жыл бұрын
Sir and Dear Friends I have a question. How can we fixed the length ? When we apply force should not we observe elongation ? I think from Stress= Module x Strain. If strain is fixed and stress is decreasing it means modulus of material also changes ? Thank you.
@marcowen15063 жыл бұрын
for a typical stress relaxation, we stretch the sample by a fixed amount and measure the stress needed to keep the sample at that length. You are correct that if strain is constant and stress is decreasing with time, that this implies that the modulus is also a function of time (see relaxation modulus in video, E_r). It is well known that polymers "remember" previous mechanical treatment: a polymer sample that has been strained is less stiff than an unstrained sample. This memory is because polymer properties are time (history) dependent. Properties of polymers are also rate dependent - there is a lot of time dependency in polymer science!
@nguyenngocvinhxd4 жыл бұрын
In Abaqus software, the viscoelastic model of material can be defined based on the shear test data of normalized shear compliance j(s) or modulus g(R). Please guide me on the way to calculate j(s) or g(R) from the stress relaxation data.
@YogeshKumar-tg3uo3 жыл бұрын
I have the same doubt. Please comment if you have found out
@kbee2255 жыл бұрын
They should call it quartzy instead of glassy shouldn't they!