I tried to gather some knowledge over the web on how to do so, and I found out that It can be done by writing a USDFLD subroutine, I managed to pick of some exapmles the following code:. Because as far as I understand the input file is only being created as soon as Abaqus starts running the solution for the job Skip to main content.

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Popular content Today's: I share the vision of iMechanica, but am not ready to post anything, should I register?User subroutine to redefine field variables at a material point. Since this routine provides access to material point quantities only at the start of the increment, the material properties for a given increment are not influenced by the results obtained during the increment.

Hence, the accuracy of the results depends on the size of the time increment.

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However, in most situations this is not a concern for explicit dynamic analysis because the stable time increment is usually sufficiently small to ensure good accuracy. Before user subroutine VUSDFLD is called, the values of the field variables at the material point are calculated by interpolation from the values defined at the nodes.

Any changes to the field variables in the user subroutine are local to the material point: the nodal field variables retain the values defined as initial conditions or predefined field variables or the values defined in user subroutine VUFIELD.

The values of the field variables defined in this routine are used to calculate values of material properties that are defined to depend on field variables and are passed into other user subroutines that are called at the material point, such as the following:. Output of the user-defined field variables at the material points can be obtained with the element integration point output variable FV see Element integration point variables.

Since the redefinition of field variables in VUSDFLD is local to the current increment field variables are restored to the values interpolated from the nodal values at the start of each incrementany history dependence required to update material properties by using this subroutine must be introduced with user-defined state variables. The state variables can be updated in VUSDFLD and then passed into other user subroutines that can be called at this material point, such as those listed above.

The number of such state variables can be specified as shown in the example at the end of this section see Allocating space. The direct components are first and then the indirect components, beginning with the component.

For example, a stress tensor contains ndir direct stress components and nshr shear stress components, which are returned as:. An array containing the field variables at the material points.

abaqus usdfld subroutine example

These are passed in with the values interpolated from the nodes at the end of the current increment, as specified with initial condition definitions, predefined field variable definitions, or user subroutine VUFIELD. The updated values are used to calculate the values of material properties that are defined to depend on field variables and are passed into other user subroutines that are called at the material points.

An array containing the solution-dependent state variables at the material points. In all cases stateNew can be updated in this subroutine, and the updated values are passed into other user subroutines that are called at the material points. The number of state variables associated with this material point is defined as described in Allocating space. Number of user-defined state variables that are associated with this material type you define this as described in Allocating space.

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Value of total time. The time at the beginning of the step is given by totalTime-stepTime.User subroutine to redefine field variables at a material point. Since this routine provides access to material point quantities only at the start of the increment, the solution dependence introduced in this way is explicit: the material properties for a given increment are not influenced by the results obtained during the increment.

Hence, the accuracy of the results depends on the size of the time increment.

abaqus usdfld subroutine example

Before user subroutine USDFLD is called, the values of the field variables at the material point are calculated by interpolation from the values defined at the nodes. Any changes to the field variables in the user subroutine are local to the material point: the nodal field variables retain the values defined as initial conditions, predefined field variables, or in user subroutine UFIELD.

The values of the field variables defined in this routine are used to calculate values of material properties that are defined to depend on field variables and are passed into other user subroutines that are called at the material point, such as the following:.

I need some guidance on writing USDFLD subroutine on Abaqus

Output of the user-defined field variables at the material points can be obtained with the element integration point output variable FV see Element integration point variables. You may not get values of some material point quantities that have not been defined at the start of the increment; e. Since the redefinition of field variables in USDFLD is local to the current increment field variables are restored to the values interpolated from the nodal values at the start of each incrementany history dependence required to update material properties by using this subroutine must be introduced with user-defined state variables.

The state variables can be updated in USDFLD and then passed into other user subroutines that can be called at this material point, such as those listed above. You specify the number of such state variables, as shown in the example at the end of this section see also Allocating space.

An array containing the field variables at the current material point. These are passed in with the values interpolated from the nodes at the end of the current increment, as specified with initial condition definitions, predefined field variable definitions, or user subroutine UFIELD. The interpolation is performed using the same scheme used to interpolate temperatures: an average value is used for linear elements; an approximate linear variation is used for quadratic elements also see Solid continuum elements.

Can anyone provide me some USDFLD subroutine examples?

An array containing the solution-dependent state variables. These are passed in as the values at the beginning of the increment. The number of state variables associated with this material point is defined as described in Allocating space. An array containing the direction cosines of the material directions in terms of the global basis directions.

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For shell and membrane elements, the first two directions are in the plane of the element and the third direction is the normal. This information is not available for beam elements. An array containing the direction cosines of the material orientation components relative to the element basis directions. If no orientation is used, T is an identity matrix. Orientation is not available for beam elements. Characteristic element length. This is a typical length of a line across an element for a first-order element; it is half of the same typical length for a second-order element.

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For beams and trusses it is a characteristic length along the element axis. For membranes and shells it is a characteristic length in the reference surface. For axisymmetric elements it is a characteristic length in the rz plane only.

User-defined number of solution-dependent state variables see Allocating space. In this example a truss element is loaded in tension. A damaged elasticity model is introduced: the modulus decreases as a function of the maximum tensile strain that occurred during the loading history. Explicit solution dependence Since this routine provides access to material point quantities only at the start of the increment, the solution dependence introduced in this way is explicit: the material properties for a given increment are not influenced by the results obtained during the increment.

Defining field variables Before user subroutine USDFLD is called, the values of the field variables at the material point are calculated by interpolation from the values defined at the nodes. State variables Since the redefinition of field variables in USDFLD is local to the current increment field variables are restored to the values interpolated from the nodal values at the start of each incrementany history dependence required to update material properties by using this subroutine must be introduced with user-defined state variables.

Variables passed in for information DIRECT 3,3 An array containing the direction cosines of the material directions in terms of the global basis directions. T 3,3 An array containing the direction cosines of the material orientation components relative to the element basis directions.We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services.

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Asked 6th Jun, Paritosh Hebbal. I have searched on google and in the abaqus manual, but there is very little information on this topic. I would love to see some example subroutines. Most recent answer. Rajkumar Shufen. Indian Institute of Technology Guwahati. You can find it in the Abaqus verification manual. Popular Answers 1. Cameron John Wilson.

PS Here's a flow chart I made for myself, showing when Abaqus calls each subroutine as far as I can work out. All Answers Hi Jonah. I have used it only for extremely simple purposes, essentially transferring node-based field variables to element-based state variables solution-dependent variables.

Here's an example sorry that ResearchGate doesn't preserve formatting :. C C Pass the field variables:.

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Another example is available here:. In this one - "Abaqus user subroutines - rat femur fracture healing" - I transfer field variable to a variable contained within the Fortran code. Let me know if you have any questions. Ihor Mirzov.

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abaqus usdfld subroutine example

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abaqus usdfld subroutine example

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