if I use cm for length, what should I use for density?
if I use cm for length, what should I use for density?
(OP)
I don't have lots of experience in dynamic analysis. if I use cm for length in dynamic analysis, what should I use for density? Youngs modulus is kgf/(cm^2)?
Thanks!
Thanks!





RE: if I use cm for length, what should I use for density?
RE: if I use cm for length, what should I use for density?
E ... convert N/m^2 ... N = 1000 gm*g (weight of 1 gm)
but g = 9810 cm/sec^2
so N = 1000*100 gm*cm/sec^2
and m = 100 cm
so that looks like 1 N/m^2 = 10 (gm*cm/sec^2)/cm^2
RE: if I use cm for length, what should I use for density?
RE: if I use cm for length, what should I use for density?
btw ... forget the jibberish about N = 1000gm*g ... of course 1N = 1000g*1m/sec^2 = 1000g*100cm/sec^2 ... g is only relevent in your model if you have inertial forces.
steel is 0.3 lbf/in^3 (weight density) = 0.009 lbm/in^3 = 0.004 kg/in^3 = 0.00026 kg/cm^3
whatever, i think converting your model to meters is the way to go
RE: if I use cm for length, what should I use for density?
RE: if I use cm for length, what should I use for density?
RE: if I use cm for length, what should I use for density?
Secondly, if you can't convert from centimeter to meter then.....well I guess I could just say: 1m=100cm.
TTFN
Fe
RE: if I use cm for length, what should I use for density?
One set of units using cm is the CGS system as follows:
Length: cm
Mass: g
Time: s
Force: dyne (symbol: dyn) = g.cm/s^2 = 10^(-5) N
Other units:
Density: g/cm^3
Modulus / Stress: barye (symbol: Ba)= dyn/cm^2 = 0.1 Pa
Work / Energy: erg = 10^(-7) J
Velocity: cm/s
Acceleration: cm/s^2
Gravity: 1 g = 980.7 cm/s^2
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Hope this helps!
RE: if I use cm for length, what should I use for density?