MMS Type D, 3D Multi Mass Spring is composed of a geometric spring shape and Multi Mass bodies, which are connected with beam forces, and contact forces for analyzing contact situations. Beam force, which is defined by beam properties (Young's modulus, shear modulus, cross section area, etc.), represents nonlinear stiffness characteristics between Multi Mass Bodies. Two kinds of contact force can be defined for MMS Type D. One is for the contact situation between up and down helix of the spring. The other is for the contact situation between two MMS type D springs.
Figure 1 MMS Type D
Connectivity of between segments in MMS Type D
•Beam Force
Two segments are connected with a beam force. Refer to a below figure.
Figure 2 Beam forces between segments of spring