Depends on what application the Nm is being subjected to. If the torque was on a circular shaft the method is as follows:
If the torsional shear stress is 250 Mpa, on a Beryllium Copper wire.
Diameter = 1.5mm (d)
Length of rod = 40mm (L)
Shear Modulus of elasticity (G) = for BCu wire = 48Gpa or 48*109 N/m2
Polar moment of Inertia (J) = (pi *d4) / 32 (for circular cross section)
J = (pi * (.00154)) / 32
J = 4.97*10-13 m4
t = torsional shear stress
Torque = T where T= ( t max * J ) / c
c is distance from the point of interest. In this case c would be from the center of the rod to the edge of the rod. ( c = d/2 ) in m. c = .0015/2 = 7.5*10-4m
letting t max be 250 Mpa..
250 MPa = 250*106 N/m2
T = ((250*106 N/m2) * (4.97*10-13 m4)) / (7.5*10-4m)
T = .165Nm
Of course the computed Torque seems low, but don't forget how small this wire is. 250MPa is stress Stress = Force / Area - the smaller the Area the greater the stress.
SO for such a small wire only .165Nm is needed to create 250MPa of stress.
To answer your question, "How do you convert MPa to Nm" You would need the application with the list of materials and dimensions.
G was for theta. Im doing that on my homework right now =P
theta (angle in rad ) = TL / GJ
theta = (.165Nm *.040m) / (48*109 N/m2 * 4.97*10-13m4)
theta = .278rad
angle = (.278*180)/pi = 15.9o I am pretty sure that is right. I'm studying Strength of Materials right now, best way for me to study is teaching other people the material I learn.
PS this is a conversion from a pressure, to a torque....pretty stupid
1 pa = 1x10-5 bar or 1 Mpa = 10 bar, therefore, to convert from Mpa to bar you simply take the number of Mpa and multiply it by 10.
7
Yield strength - 13.8 MPa Ultimate tensile strength - 31 MPa
Most stainless steels have a strenght of at least 500 MPa. Most alloy steels also have that strength.
520 Mpa
1 pa = 1x10-5 bar or 1 Mpa = 10 bar, therefore, to convert from Mpa to bar you simply take the number of Mpa and multiply it by 10.
There are 6.8948 MPa in one ksi. To convert ksi (kips per square inch) to MPa (MegaPascals), multiply the number of ksi by 6.8948.
7
MPa x 145 = psi
1 psi = 64984.65 Pa Therefore 50 MPa = 769 Psi
Multiply psi by 0.006894759086775369 to convert from psi to MPa. ex: 1000 psi = 1000 x 0.006894759086775369 = 6.89 MPa http://www.chapelsteel.com/psi-mpai.html
convert 15 nm into km
1000000
Multiply by 1000000.
5 pascals (Pa) = 0.000005 megapascals (MPa)
You cant. One is a measure of rotational speed and the other is a measure of applied torque. You could convert Nm to Ft-lbs or In-lbs.
kN = kilonewtons - Newtons are a unit of forceMPa = megapascals - Pascals are a unit of stresskilo denotes that you multiply the value by 1,000 and mega denotes that you multiply the value by 1,000,000Stress = Force per unit areaAs such 1 Pa = 1 N/m21 MPa = 1000 kN/m2So to convert kN into MPaStress (MPa) = Force (kN) / (Area (m2) * 1000)