Ah yes I see Bavid, it's all good now. I've gone back to the basics and reworked everything, and am now getting three nice RSS values, all which seem intrinsically correct.
Thanks for all your help, it's much appreciated!
Hi Bavid,
I think you might be mistaken, I've double checked on a few different sites/textbooks and all seem to say this:
Or worded such as:
Pulled from these nice sites:
http://oregonstate.edu/instruct/engr322/Homework/Previous/S10/ENGR322HW3.html...
Ahh I see now, so I need to be recalculating cos(phi) for every slip system, I had just assumed that it was a constant throughout all systems. That'll mean some of my other RSS values will be slightly off as I used an incorrect cos(phi), but no issue, it can be easily fixed.
The only issue is...
Wait, so now all my values for the RSS should be zero...? Above you indicated my calculations were correct :S
I have my cos(phi) as the angle between [1,-2,1] and [1,-1,-1], which is:
cos(∅) = ((1*1)+(-2*-1)+(1*-1))/(sqrt((1^2+(-2)^2+1^2))*sqrt(1^2+(-1)^2+(-1)^2))
cos(∅) = 2/(3*sqrt(2))
I...
Thanks for the reply again Bavid. Have fixed up my units and am getting a far more reasonable answer now. This is the only point that I'm still a little lost on, which of the cases will have a rss of 0? Breaking it down from what I see:
[1,-2,1] for tensile axis, [0,-1,-1] for slip dir, not...
Thanks for the replies Bavid. This is the working I've gone through, I think something may be wrong though, I'm getting oddly small values for the RSS.
First, F = 60kN.
A = pi*5^2 = 25*pi.
Find cos(∅) first, as it's constant (angle between tensile axis and normal):
Angle between [1,-2,1] and...
Firstly thanks for the reply Bavid.
But yes I see now. So if there are three possible slip directions, and therefore three possible values for cos(λ), and therefore three values of the RSS, how will I know which is the correct RSS? Or is the question asking for the RSS in each direction, so...
Hi everyone,
I've taken a course at uni that may be a little bit over my head, and am pushing through an assignment for it at the moment in an attempt to do well. I've hit a bit of a roadblock on one question though, so am hoping that someone kind here can help me out! The question is...
Hi guys,
Got an exam this afternoon, and really need help with this. I think I'm right, but I just need verification and explanation.
Homework Statement
A car rounds a bend with a radius of 200m. At a particular instant, the car has a velocity of 60km/h. The speed of the car is increasing at...
I'm aware that there is a formula for average speed (s=d/t), but something like that wouldn't cut it for a 3 mark question, especially when there's two follow-on questions after it. The question also asks how you would measure the average speed, rather than what average speed is.
Also, don't...