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faq [2022/11/04 12:08] jan.dejong |
faq [2023/11/09 22:30] marijn.nijenhuis [3. Changing units] |
* material density (''eprops(i).dens''): default unit is kg/m^3 so density scales as 1/L^3. | * material density (''eprops(i).dens''): default unit is kg/m^3 so density scales as 1/L^3. |
* cross-sectional dimensions (''eprops(i).dim''): default unit is m so these dimensions scale as L. | * cross-sectional dimensions (''eprops(i).dim''): default unit is m so these dimensions scale as L. |
* gravitational acceleration (''opt.gravity''): default unit is m/s^2 so acceleration scales as 1/L. | * gravitational acceleration (''opt.gravity''): default unit is m/s^2 so acceleration scales as L. |
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In other words, if your script assumes meters as the unit for length, and you want to go to millimeters, the ''nodes'' matrix should be multiplied by 10^3. Likewise, the forces should be multiplied by 10^3, the moments by 10^6, the elasticity and shear modulus by 10^(-3), and all other quantities according to the list above. | In other words, if your script assumes meters as the unit for length, and you want to go to millimeters, the ''nodes'' matrix should be multiplied by 10^3. Likewise, the forces should be multiplied by 10^3, the moments by 10^6, the elasticity and shear modulus by 10^(-3), and all other quantities according to the list above. |