Hi, just wanted to ask for the von Mises criterion equation, is the equation without the SF (the one I circled in blue) only applicable when yielding has FIRST occurred? (i.e when SF=1)? and is the equation including the SF (one I circled in orange) applicable to all cases? (i.e whether the...
Hi, there's no particular question I need help on - just a few things I need clarifying. To determine the max shear stress, I know max shear stress = (max normal stress - min normal stress)/2, but are these equations true for a 3D stress state? (please look at attached image)
Thank you
Hi, there is no particular question that I need help on, just something my lecturer told us in lesson which I couldn't quite understand so i'd like to check my understanding on this. I know that the speed of a soundwave is 'c' in undisturbed flow. Suppose the flow velocity is 'U'. If the...
<< Mentor Note -- thread moved from the schoolwork forums to the ME forum because it's more of a general question >>
Hi, in these column bucking notes (photo attached below) it says that bar BC will buckle first out of all the other bars in compression, but it does not explain why. I know it...
Hi, i’m learning about the thermal efficiency of a diesel cycle at university and I'm trying to understand the equation. The first law of thermodynamics states Wnet + Qnet = 0, but one of the attachments below says Qnet - Wnet = 0 and I don't understand how this is the case. Also, for process...
Just wanted to say thank you for replying to my threads! You’ve been a big help and i understand statics more now haha. Had my exam too and it went okay!
Not really, if the strain gauges are fitted at the top then shouldn't the value for either the max tensile or max compressive strain be 0? since at the top of the beam there's either only maximum tensile stress (and zero compressive stress) or max compressive (and zero tensile stress), depending...
Ahh, I see. I guess I'm safe with stating sagging moments as positive and hogging as negative. Do you know how he knew that the max compressive strain is at the largest sagging moment? i thought both sagging and hogging BM's cause both max compressive and max tensile stress (for sagging its max...
Yayy, okay last thing I'm going to bother you with promise! haha (sorry): I've attached a question I'm stuck on, it's part (c) of the attachment. I've attached both my solutions (blue writing) and my professor's (black writing); instead of substituting P/w into T like how he did, I kept T as it...