hysteretic material

[senior]

i have modeled a hysteretic material for my structure but it has an error. I have written the material as this:

uniaxialMaterial Hysteretic 711 0.0011 64000000 0.00642427 68241600 0.01120305 31808000 -0.0011 -64000000 -0.00642427 -68241600 -0.01120305 -31808000 0 0 0 0 0

the error is:

HystereticMaterial::HystereticMaterial -- input backbone is not unique (one-to-one)

1)what is the problem?
2)if i want to have no deterioration what numbers i shoud use for pinchX ,pinchY ,damage1 ,damage2 and beta?

[mhscott]

It looks like you are defining your points in (deformation,force) ... the input should be (force,deformation)

uniaxialMaterial Hysteretic 7111 64000000 0.0011 ... and so on

[AngusHunter]

mhscott wrote:
> It looks like you are defining your points in (deformation,force) ... the
> input should be (force,deformation)
>
> uniaxialMaterial Hysteretic 7111 64000000 0.0011 ... and so on

Hi professor
I am wondering the parameters in the Hysteretic Material should be the (deformation-force) or (strain-stress) ?
Thanks a lot!