RamSeries manual
The default units system for Rambshell and ramsolid is the International System (IS). They are:
· Time in seconds (s)
· Lengths in meters (m)
· Masses in Kilograms (kg)
· Forces in Newton (N)
· A derived unit is Pascal (Pa), where Pa=N/m2
These units can be changed in several parts of the program. Every window that asks for data for constraints, load or properties has a field to choose the units for that window. The chosen units are only applicable in the data attached to it in the same window.
The units in which are expressed the coordinates of the geometrical model are chosen in the Problem data window:
Data -> Problem data -> Units -> Mesh units
The units in which are expressed the results of the analysis can be chosen in:
Data -> Problem data -> Units -> Results units
Other predefined units that can be chosen are:
· Forces: Kilogram-force (kp)
· Lengths: centimeter (cm), millimeter (mm)
Results units can be expressed as:
¨ N-m-kg where:
o Displacements are in m
o Velocities are in m/s
o Accelerations are in m/s^2
o Strengths are in N/m or N·m/m
o Stresses are in Pa= N/m2
¨ N-mm-kg where:
o Displacements are in mm
o Velocities are in mm/s
o Accelerations are in mm/s^2
o Strengths are in N/mm or N·mm/mm
o Stresses are in N/mm2
¨ Kp-cm-utm where:
o Displacements are in cm
o Velocities are in cm/s
o Accelerations are in cm/s^2
o Strengths are in Kp/cm or Kp·cm/cm
o Stresses are in Kp/cm2
¨ KN,m,Mpa where:
o Displacements are in m
o Velocities are in m/s
o Accelerations are in m/s^2
o Strengths are in kN/m or kN·m/m (kN=103 N)
o Stresses are in Mpa=106 Pa
Note that the units in this system does not form a compatible system.
Note for advanced users: In order to add new units to the predefined set in rambshell, it is necessary to modify two files: rambshell.cnd and rambshell.bas contained in the directory rambshell.gid. This directory is the predefinition of the problem type rambshell inside GiD. In the file rambshell.cnd, it is necessary to search the fields Units and add the new unit to all of these fields. In the file rambshell.bas it is only necessary to add an entry to the units table that is at the beginning of the file.