MAT5

MAT5 lets you define a hyper-elastic material model for NLFE elements based on the Yeoh material model.

<MAT5

id = "integer"

C10 = "real"

C20 = "real"

C30 = "real"

nu = "real"

rho = "real"

YS = "real"

Unique material property identification number.

C10

Material constant ().

C20

Material constant ().

C30

Material constant ().

Poisson’s ratio for the element. Default is 0.49.

rho

Element density.

An elastic limit for strain. Default is 0.0.

YS >= 0.0

1.	This material element defines a hyper-elastic material that follows the Yeoh material model law for the strain energy density function:

where

are the material properties.

is the bulk modulus

is the Poisson’s ratio

Each element must have a unique material identification number.

2.	The constants C10, C20 and C30 denote material parameters of shear modulus that are usually determined experimentally.

3.	YS lets you specify a maximum limit on the elastic strain that the component is allowed. If, during the simulation, the component strain (at any element in the component) exceeds this value, MotionSolve issues a warning message.

The example demonstrates the definition of a MAT5 element.