Recent content by johnjaypl

I believe they use u (mu) for shear modulus. So: c44 = u12 = G12 c55 = u13 = G13 c66 = u23 = G23 Is that right? Is there a formula that allows one to calculate Gij from other properties? Well I started with more conceptional missunderstanding than that but at this point I get the...

Thanks. I'm so confused I can't even formulate a decent question. Let me try again. What I'm trying to understand is described in the Orthotropic material section of this link http://www.engin.brown.edu/courses/En222/Notes/Constitutive/Constitutive.htm How do I go from understanding E...

Could some one explain, or give me a pointer to a good explanation, of how the nine constants that are often used to define orthotropic materials are determined. I understand what E is in each direction. I understand poisson ratio. I sort of understand G. (I understand it as the E...

I think I understand my question now. I'll try to explain. First, why is Q related to the resonant frequency/bandwidth? Well using a series LRC as the resonant application. Q is not directly related to the resonant frequency, the resonant frequency is set by LC (although somehow that...

I think it's the next step where I'm missing something important. Now if you take that system and drive it at a frequency that is not w0 but somthing close how does the damping and Q effect the steady state solution? What I'm triyng to get at is, how does larger damping widen the resonance...

Well I learned a new phrase from all of that "resonance transmissibility" which I'll dig deeper into. I think it may unlock the secret of how and why damping effects the frequency response around resonance. Thanks, John

I can understand how the damping effects the system at the limits. That is, if you have no resistance, i.e. no damping then you get an infinite spike at the resanant frequency. And, if you have no reactance just damping- resistance then you get a flat frequency response. I'm having trouble...

I"m having trouble relating the concept of 2pi *(maximum energy stored/energy dissipated per cycle) to the concept of( Frequency of resonance)/(bandwidth of resonance). These two things seem very different yet they are related (in fact they're equal), is there an intutive explanation for why...

Could someone explain why Quality factor, which as I understand it, is 2pi *(maximum energy stored/energy dissipated per cycle) is related to the resonant frequency/bandwidth? I don't understand the connection between the two concepts. Thanks, John