Viscosity02
Viscous Damper
This material model does not respond to strain/displacement. To represent materials that respond to both displacement and velocity, see Maxwell
and Kelvin
.
See also damper elements Damper01
and Damper02
.
References
Theory
The quadrant damper is implemented.
The damping force is defined as a function of displacement and velocity (or strain and strain rate, depends on what the input is).
The damping coefficient is a function of strain and strain rate that can be expressed as follows, which shows different response in different quadrants.
Syntax
material Viscosity02 (1) (2) (3) [4] [5] [6] [7] [8]
# (1) int, unique tag
# (2) double, alpha
# (3) double, damping coefficient \eta_1
# [4] double, damping coefficient \eta_2, default: (3)
# [5] double, damping coefficient \eta_3, default: (3)
# [6] double, damping coefficient \eta_4, default: (3)
# [7] double, steepness factor g_1, default: 1E3
# [8] double, steepness factor g_2, default: 1E3
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