Plastic and Elasic Modulus
Plastic and Elasic Modulus
(OP)
Please advise what is the difference between plastic and elastic modulus and how do we calculate the Plastic Modulus? Thank you.
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Plastic and Elasic Modulus
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Plastic and Elasic ModulusPlastic and Elasic Modulus(OP)
Please advise what is the difference between plastic and elastic modulus and how do we calculate the Plastic Modulus? Thank you.
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RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
The plastic section modulus is calculated by first finding the PNA (plastic neutral axis). This is the axis about which there is an equal amount of AREA above and below.
The next step is to find the centroid of the area above and below the PNA independently.
Now multiply the total area of the section times the distance between these two centroids. Now you have the plastic section modulus. This for a ductile material like steel. It is similar for something like a steel beam with a composite concrete slab, but not exactly the same.
RE: Plastic and Elasic Modulus
perhaps dcnnng could clarify if he's using the term referring to stress/strain curves or to "section modulus" (menaing stresses for a cross-section in bending).
RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
See my response above. It is pretty detailed and will give you the plastic section modulus.
RE: Plastic and Elasic Modulus
Thank you StructuralEIT for your input, do you mean that the neutral axis for elastic modulus is based on linear triangular stress block with only the outer layer at full stress whereas the plastic modulus is based on full rectangular stress block ? Thank you!
RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
The rest of it is correct.
RE: Plastic and Elasic Modulus
You should be asking your supervisor(or lecturer) these sorts of questions, this forum is not really a good place to learn these types of fundamental concepts.
csd
RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
AISC limits us to the approach outlined above.
RE: Plastic and Elasic Modulus
Appologies but we do get students on this forum every now and then and I know nothing about you.
If you have to ask about something so fundamental then it shows me that you do not understand it. You will get quick answers in this forum, but it will not necessarily help in your understanding.
As engineers we should not only know, but also understand. It is often the lack of the latter that leads to engineering failures.
csd
RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
RE: Plastic and Elasic Modulus
No idea, but it goes to show that when you deal with overseas engineers its best to state what it is and not just use the letter.
csd
RE: Plastic and Elasic Modulus