<< Click to Display Table of Contents >> Navigation:  FEA Compliant Modeler > Boundary Conditions > Join > Forces on joined nodes

Gravity Force on joined nodes

 

Gravity force applied to a node depends on the distributed mass set M, from the mass matrix and gravity acceleration g.

 

For a joined pair of points from two parts, there are two sets of distributed mass values from two parts, marked by M_a and M_b.

 

The gravity force on the joined point can be expressed in this simplified equation if gravity move applied to both parts:

 

F_g = M_a*g + M_b*g,       where M_a is saved in the Mass Matrix File of Part_A.

 

Therefore, we combine the two different gravity forces based on the Mass Matrix files of two original parts.

 

 

Thermal Force on joined nodes

 

Similarly, thermal load applied to a node depends on temperate (T) and thermal property (\theta)

 

Equivalently thermal force on the joined point can be expressed in this equation if thermal move applied to both points:

 

F_\theta = \theta_a * T_a + \theta_b * T_b,       where  result of \theta_a * T_a is saved in the Thermal Load File of Part_A.

 

Again, we combined two different thermal forces based on the Thermal Load Files of two original parts.

 

Note:

The main difference is here: gravity acceleration g is always the same for two parts. But temperate changes T don't have to be the same at the two points.