There are two types of simulations in Abaqus to simulate a process which are 1- Implicit 2-Explicit model. Implicit models are helpful to simulate a process close to a steady-state. On the other hand, Explicit models are good to simulate fast models with element deletion. The damage model is one of the explicit models. Damage models are common to simulate part failure and only possible with the explicit method.
Explicit Vs Implicite models:
Implicit models have large increment time and capable of modelling with larger step time. The advantage of using implicit models is creating models that require a longer time in the real process. This is because of the element formulations used in this technique. The most common examples of implicit models are rolling process, low deformation processes and satellite movements in space. However, there are problems which make impossible to use implicit models for some process. In models that require sudden change and large deformation, it is necessary to use small increment time. Since the required time to solve each increment is large, it is not affordable to create models with numerous increments. Consequently, implicit models are not good for models like simulating explosions and some types of forging.
Explicit models have smaller increment times compare to implicit models. In fact, explicit models are the combination of lots of static models to minimize the effect of acceleration in simulation. The increment times are small enough to ignore the effect of acceleration in each increment. However, the effect of acceleration excites in the whole process. Since the increment times are small it is possible to create models with large deformation and sudden changes. The most common examples of explicit models are explosion, large deformation process, and models with complex surface contacts.
Abaqus provides various types of damage models to simulate a part failure. Base on the material properties, the different types of models can be considered. In fact, the damaged property for brittle and ductile material are different. For some models, it is necessary to choose elements with deletion property to show the part failure graphically. In addition, it is necessary to consider the specific field output to be able to show element deletion in the process.
More details about this product:
There are many kinds of processes that require to use of explicit models to solve. Base on the process the model can be time-consuming or complex to simulate. Thus, The best way to start is to create a straightforward and interesting model. a Damage model is a second step to learn explicit models. If you are an absolute beginner you can start with the following product:
A damage model for a bullet penetration (Second approach)
This model is between intermittent and beginner level. Using this model helps you to start learning for more complex explicit models. Penetration is a very interesting study to study the effect of material properties on penetration. Furthermore, In more complex models it is possible to predict the temperature field after penetration. To simulate the penetration, there are various approaches which in here we are going to cover one of them. If you are interested to learn more approaches, use the following product:
In this example, we try to learn how to use an Explice method to simulate the bullet crushes a plate. We also define damage in this model so when the elements excise the limit they will be deactivated and the stiffness matrix becomes infinitesimal. Unlike the first approach, you don’t need to use the Abaqus keyword to define any material properties. Because of the element deletion option, this approach is straightforward and has better graphical results.
In this product, we only give an example to help you with using the Damage property for your model. We avoid giving too many details so you can easily use these products and learn how to use this option in Abaqus to simulate super large deformation processes. In this product, you can find the following files:
Abaqus files: CAE, ODB, INP, and JNL
Powerpoint files that contain more details.
Video files: How to create this model, Powerpoint presentation.
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