Non Linear Spring R15.0 v1

7/24/2019 Non Linear Spring R15.0 v1

1/5

2012 ANSYS, Inc. April 14, 2014 1 Release 14.5

15.0 Release

Nonlinear Springs using ACT

Workbench Mechanical 15.0

Mohamed Senousy, Ph.D., [email protected]

7/24/2019 Non Linear Spring R15.0 v1

2/5

2012 ANSYS, Inc. April 14, 2014 2 Release 14.5

IntroductionThis ACT extension allows introducing a unidirectional spring element

with nonlinear generalized force-deflection capability that can be

used in any analysis.

The extension utilizes the Combin39 element, and allows choosing among

the available key options (KEYOPT) for this element

7/24/2019 Non Linear Spring R15.0 v1

3/5

2012 ANSYS, Inc. April 14, 2014 3 Release 14.5

Key options descriptionKEYOPT(1) Unloading path:

0 -- Unload along same loading curve

1 -- Unload along line parallel to slope at origin of loading curve

KEYOPT(2) Element behavior under compressive load:

0 -- Compressive loading follows defined compressive curve (or reflected tensile curve if not defined)

1 -- Element offers no resistance to compressive loading

2 -- Loading initially follows tensile curve then follows compressive curve after buckling (zero or negative

stiffness)

KEYOPT(3) Element degrees of freedom (1-D) (KEYOPT(4) overrides KEYOPT(3)):

0, 1 -- UX (Displacement along nodal X axes)

2 -- UY (Displacement along nodal Y axes)

3 -- UZ (Displacement along nodal Z axes)

4 -- ROTX (Rotation about nodal X axes)

5 -- ROTY (Rotation about nodal Y axes)

6 -- ROTZ (Rotation about nodal Z axes)

7 -- PRES

8 -- TEMP

KEYOPT(4) Element degrees of freedom (2-D or 3-D):

0 -- Use any KEYOPT(3) option

1 -- 3-D longitudinal element (UX, UY and UZ)

2 -- 3-D torsional element (ROTX, ROTY and ROTZ)

3 -- 2-D longitudinal element. (UX and UY) Element must lie in an

X-Y plane

KEYOPT(6) Element output:

0 -- Basic element printout

1 -- Also print force-deflection table for each element

(only at first iteration of problem)

7/24/2019 Non Linear Spring R15.0 v1

4/5

2012 ANSYS, Inc. April 14, 2014 4 Release 14.5

force-deflection curve

7/24/2019 Non Linear Spring R15.0 v1

5/5

2012 ANSYS, Inc. April 14, 2014 5 Release 14.5

Spring Selection

A spring ahs to be defined first in the Mechanical environment.

Thereafter, it will be selected using the current extension and

modified to a nonlinear spring element

1

2

3