Recent content by pecosbill

the problem mentions nothing about loading and unloading, so i assume it was one constant stress/strain graph though?

this is the solution my teacher handed out in class today, but when i asked him about adding the yield strength, he forgot why he added it. _____ TRANSLATE INTO S: if volume is constant, sigma=l/a=(V(0)L)*s/VL(0)) sigma=(L/L(0))s ln(L/L(0))=E or L/L(0)=e^0.25 sigma(at UTS)=60000=se^0.25...

yes, after necking begins. however, this is the only information i was provided with, no young's mod.

Homework Statement What is the ultimate tensile strength if necking begins at a true strain = 0.25 in a material whose stress strain curve obeys the relation: sigma=120000(epsilon)^1/2 psi? Homework Equations The Attempt at a Solution I'm kind of stumped on this. I really...

I think that's what I did. The confusion is in part because of the 8-10 typo, but also because of the two methods, and the fact that I don't have the capability to make integrals easily. If you know a program that will do this, I'd appreciate it. The bounds and integrals that I used ended up...

also, it will take 17-6.32 seconds to travel that 200*pi

no, that's not correct. first, the acceleration integral is from starting point t=0. secondly, the velocity integral is going from 0 to 8 (or as I mistyped it, 10)

hahahah. okay. thank you.

and btw, thanks for the help guys. i really appreciate it. this forum is really cool and i plan on participating by responding to other people's questions

also, yes, that 10 is supposed to be an 8. i'm just trying to establish two things: a. is it correct to model this as if it were traveling down a straight track with this acceleration? b. is this answer correct?

well if it starts with a(0)=0 and v(0)=0, there would be no constants.

Homework Statement A schoolbus travels around a circular path with acceleration a(t)=0.5t m/s/s with t in seconds. At some point it has a velocity of 8 m/s. What are the magnitudes of its velocity and acceleration when it has traveled a fourth of the circular track from the point at which...

Homework Statement A schoolbus travels around a circular path with acceleration a(t)=0.5t m/s/s with t in seconds. At some point it has a velocity of 8 m/s. What are the magnitudes of its velocity and acceleration when it has traveled a fourth of the circular track from the point at which...