I want to perform a nonlinear dynamic analysis (DYNAMIC IMPLICIT step) of a RC column under earthquake excitation in Abaqus (Standard or CAE).
While there is no problem with my simulation using MATERIAL DAMPING options with default materials (like Concrete Damaged Plasticity), I can not apply Rayleigh damping when I use an User Material for Concrete (see screenshot). The following error occurs:
***ERROR: A MATERIAL PROPERTY THAT IS NOT ALLOWED WITH A USER MATERIAL HAS BEEN SPECIFIED
So apparently it is simply not possible to use it with a UMAT.
Are you aware of other possibilities to use Rayleigh damping (stiffness & mass proportional damping) with a UMAT?
I have read about GLOBAL DAMPING, but this is not applicable for direct solution procedures like DYNAMIC IMPLICIT.
Areometr
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Areometr (yun. araios – ingich-ka, bu yerda suyuq va metron – o‘lchov) – suyuqlik va qattiq jismlarning zich-ligini o‘lchaydigan asbob. A. tuzilishi Arximed qonunita asoslangan. Bunda A. siqib chiqargan suyuqlik og‘irligi uning og‘irligiga teng. A. doimiy og‘irlikli va doimiy hajmli bo‘ladi. Doimiy og‘irlikli A. (1-rasm) bilan o‘lchashda zichlik A.ning suyuklikka botish darajasiga qarab aniqlanadi. Bu xildagi A.ga densi-metrlar (shkalasi zichlik birliklarida darajalangan), eritmalarning konsen-tratsiyasini (quyuq-suyuqligini) o‘lchash uchun ishlatiladigan spirtometrlar va saharometrlar (shkalasi og‘irlik yoki hajmiy foizlarda darajalangan) kiradi. Densimetrlar shisha yoki metalldan yasaladi. Yuqori temperaturalarda metall densi-metrlar ishlatiladi. Odatda A. ma’lum (asbobda ko‘rsatilgan) temperaturada darajalan-gan bo‘lib, bosh-qa temperaturalarda o‘lchangan qiymatlarga tegishli tuzatmalar ki-ritiladi. Doimiy hajmli A. (2-rasm) bilan zichlikni o‘lchashda asbob suyuklikka halqasimon tamg‘asigacha botiriladi. Shunda suyuqlik zichligi palladan olin-gan yoki unga qo‘yilgan toshlar qiymati bilan aniqlanadi. Qattiq jismlarning zichligini o‘lchashda doimiy hajmli A. korpusining pastki qismiga qo‘shimcha palla biriktiriladi (A.-tarozi).
Kuvonchbek Rakhimberdiev sorry, but that does not answer my question. The question is about dynamic analysis in Abaqus and how to add Rayleigh damping when an UMAT is applied.
Best,
Michael J. Kohler
Dear Michael J. Kohler ,
What properties of a Rayleigh damping do you want to apply?
Ali Ahmadi I want to apply stiffness and mass proportional damping, so alpha and beta would be my desired input variables.
Best,
Michael J. Kohler
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