MTS Series 315 Load Frame - Manual (Page 14)

Series 315 Load Frame 14 Introduction
Load Frame Stiffness Calculation
The Load Frame Spring Rate (stiffness) value reported by MTS is a combination of
the theoretical stiffness of the top plate (crosshead), columns and baseplate. The
equations that are used to calculate these numbers are presented below.
Definition of Terms A = Area
D = Depth
E = Modulus of Elasticity
G = Modulus of Rigidity
H = Height
I = Moment of Inertia
K = Spring Rate
L = Length
W = Width
Top Plate
Columns
D
B
815-315-09
D
C
D
T
W
T
W
B
Base Plate
H
C
H
T
H
B
W
C
Spring Model
Top Plate
(T)
Columns
(C)
Base Plate
(B)