Abaqus “Too Many Attempts” and “Time Increment Required is Less than the Specified Time” Errors
Abaqus is a friendly user software to solve the finite element method models. The software covers a large variety of models by providing many options to users. To simplify the modelling process, it uses many predefined parameters to help the engineers to save time on the modelling process. However, depending on the model each might require different parameters and skipping them leads to creating errors in simulation. As a result, in Abaqus, you might face many errors which some are easy to solve, and some are difficult. The most comment errors are the “Too many attempts” and “Time increment required is less than the specified time”.
Where you can find the type of error
You can find the errors from the message file or STL file in the Abaqus job directory. The easiest way to find the error is from the monitor section in the job manager. From the incrementation, for the “Too many attempts” error you could see that the last 5 of them were reduced. For the “Time increment required is less than the specified time” error you could see the last increment size is smaller than the defined increment in your step. There is also a comment in the report that also explains the error to you.
These two errors might appear for many reasons which make them very common to appear. These errors explain the solver tried to solve the simulation but due to some mistake in the model, it aborted the process. The errors might happen cause of mistakes in, any module such as material properties, step, load, and mesh. Here each part is explained individually:
1-Load and Boundary conditions: While every module is important, the load and boundary condition definition in simulation have the most important impact on results. In this video, we try to explain the most common mistake that might happen in the load module that creates the errors explained before. This video is short and helps you to find the error in your simulation quickly.
2-Material Properties: Material properties play important role in model accuracy and processing time. In Abaqus, it is common to define the data points in a table. Abaqus uses interpolation to extract the results between each table raw and for the results out of the domain it uses the last data in the table. While inputting more data helps to gain more model accuracy it might cause convergence issues. To understand how many data points are required we need to understand how Abaqus uses the data to solve the model.’
3-Step and Increment: Too many attempts” and “Time increment required is less than the specified time” are two common errors in Abaqus. These are mostly caused due to making mistakes in creating steps. Abaqus provides various steps such as heat transfer, general static, explicit, and implicit dynamic steps. These define the type of the simulation, and each required different details to define. The Abaqus requires to divide each step into multiple increments to solve the model. The software gives you the option to control the size of the increment and making mistake leads to an error during the simulation process. To avoid these problems, you need to understand the concept of incrementation and step time. Here we first explain the initial, minimum, maximum, maximum number of increments, and max. allowable temperature change per increment. Then we will explain the common mistake in heat transfer and mechanical model by showing 5 examples. We go over each example and check the problem then we try to solve them by editing the step details.
The tutorial video
This video explains the common error called “too many attempts” and “Time increment required is less than the specified time” in Abaqus for beginners. If you feel you need to know more about the process of solving and model in Abaqus. please watch the following video:
If you are interested to know how you can change the step settings to modify the incrementation please watch the following link:
The recorded video is about 10 minutes and helps you to learn how to detect and fix the errors.
This video is made by Reza Tangestani. For more information, please send him an Email:
Just in case you like to know more about Abaqus?
Abaqus is an FEA software for multiple engineering purposes. It is been widely used by many researchers, companies, and students to simulate simple and complex models. Among the other software, Abaqus is known as a flexible tool to analyze the process. While it has a friendly-user environment, it is not easy to learn as the licensing is extremely expensive. Therefore, the tutorial videos are not easy to find or too expensive. Before explaining the Abaqus tutorial details, we should first learn what Abaqus covers and what exactly it is. The following explanation is from Abaqus 6.14 documentation.
Abaqus/CAE is a Complete Abaqus Environment that provides a simple, consistent interface for creating, submitting, monitoring, and evaluating results from Abaqus simulations. Abaqus/CAE is divided into modules, where each module defines a logical aspect of the modelling process; for example, defining the geometry, defining material properties, generating a mesh, submitting analysis jobs, and interpreting results.
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