3/13/2021 0 Comments Using Sigini Subroutine
User subroutine UMAT in AbaqusStandard and user subroutine VUMAT in AbaqusExplicit allow constitutive models to be added to the program, while user subroutine UEL in AbaqusStandard and VUEL in AbaqusExplicit allow the creation of user-defined elements.Detailed descriptions are given of the data required for these subroutines, the additional statements to be included and the variables that are available within the routine.
Particular attention is paid to highlighting good practice in user subroutine development.Examples of various user subroutines are used to illustrate the points made in the lectures. Please note that the actual course agenda may vary depending on location. Please note that by using this site you are consenting to the use of cookies. Further: Default output points In ABAQUSStandard the default output points through the thickness of a shell section are the points that are on the bottom and top surfaces of the shell section (for integration with Simpsons rule) or the points that are closest to the bottom and top surfaces (for Gauss quadrature). For example, if five integration points are used through a single layer shell, output will be provided for section points 1 (bottom) and 5 (top). So all I have to do is identify the node, and within each KSPT1 and KSPT5 define SIGMA(1),., SIGMA(i),. Thanks for your help. An interesting problem and I am also puzzled with it I ever meet one paper about the efficient problem-solving by using shell element to replace the continuum solid element through the thickness such as of cylinder, the resulting stress in shell element can be mapped into the solid element (to maping the stress value of section point of shell to the node of solid element), but I am still puzzled about it,can anyone give me some suggestion about it Hi all,Does anybody know if I can model residual stresses (linear diagram)over the shell thicknessSIGINI can be usedThe manual says:Defining initial stressesYou can define an initial stress field. Initial stresses can bedefined directly or, in ABAQUSStandard, by user subroutineSIGINI.Stress values given directly will be applied uniformly over theelement unless they are defined at each section point through thethickness in shell elements.Further:Default output pointsIn ABAQUSStandard the default output points through the thickness ofa shell section are the points that are on the bottom and top surfacesof the shell section (for integration with Simpsons rule) or thepoints that are closest to the bottom and top surfaces (for Gaussquadrature). For example, if five integration points are used througha single layer shell, output will be provided for section points 1(bottom) and 5 (top ).and SIGINIKSPT-Section point number within the current layer.So all I have to do is identify the node, and within each KSPT1 andKSPT5 define SIGMA(1),., SIGMA(i),.Thanks for your help.Joao Non-text portions of this message have been removed. Hi Joao, Post by jocagalhao2000 Does anybody know if I can model residual stresses (linear diagram) over the shell thickness SIGINI can be used Defining initial stresses. Post by jocagalhao2000 So all I have to do is identify the node, and within each KSPT1 and KSPT5 define SIGMA(1),., SIGMA(i),. More or less, yes. Remember that the integration point order goes from bottom to top, and that bottom and top are defined by the element normal, which is defined by the element connectivity. Normally you can check these in the preprocessor (CAE or any other program you use), so it should not be a problem. Also, what you wrote about the default output points does not apply to SIGINI: you need to define the stress at all the section points that ABAQUS passes to you, otherwise they will be zero (or even worse, undefined) and you get a jigsaw stress profile through the thickness The good news is that the location of Gauss points is well known, and Simpsons should be equispaced.
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