Lecture - 3 Introduction to Finite Element Method

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[AntoMelta]

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[AntoMelta]

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[willamricard]

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[imegatrone]

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[lenin9k]

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[ThePaul778]

It's a little confusing b/c he's using Hooke's law to define the "applied" force, not the "restoring" force. In other words, Hooke's law tells you that F = -ku, where F is the restoring force, which is always in the opposite direction to the applied force. He's applying Hooke's law to the applied force, so it is P = ku, where P = -F, where P is the applied force.

[ThePaul778]

A = area of the cross-section of the bar, not the bar itself.

[damieneatsrice]

I suppose he is using the superposition principle??

[damieneatsrice]

@ 38.48 when he writes K1*U1 = F1...Isnt he missing the term -K1*U2 as well? In other words shouldnt it be K1*U1 - K1*U2 = F1. (By virtue of the multiplication property of the matrix)???

[kesav1985]

@damieneatsrice

U seemed to have missed some of the sentences before that. He clearly mentioned that 'let us apply unit displacement to u1 and zero to u2 and u3'. This is called method of displacements and here he used it to explain that watever has been derived in that matrix equation makes real sense, stating that diagonal terms are positive. hope u got it now.

[ThePaul778]

@damieneatsrice yes, where k1*u2 = F1, but F1 = -P, so that equation gives him that u2 = P/k1, which he derived later.

[noncomformistpl]

Thank you, very straightforward and useful.

[Basavaraj777]

Thank you verymuch sir. 

[sexwaxtax]

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[U2PLUS]

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