Abhimanyu Singh, If you want to apply a 2 mm displacement with a 0.05 strain rate, you would need to apply the displacement over a period of time of 2 / 0.05 = 40 seconds. Make sure you use dynamic step. To do this, you would need to create a dynamic step in your Abaqus simulation and specify the displacement and the strain rate. The total time for the simulation would then be 40 seconds.

Engr. Tufail I am new to Abaqus can you explain a little bit about the dynamic step.

I think you can try to use a displacement/rotation BC， and specify in the amplitude，using tabular method：

time 0s at position 1

time 1s at posiiton 2

······

finally，realize setting strain rate

Hi Abhimanyu Singh

In Abaqus, applying a displacement or strain rate condition can be achieved through boundary conditions and predefined fields, respectively. Here's a step-by-step guide on how you might achieve the application of 2 mm displacement along with a 0.05 strain rate:

### Step 1: Apply Displacement

1. **Create/Edit Step**: Ensure you have an appropriate step for applying your displacement.

2. **Define Boundary Condition**: Go to "Boundary" under the "Load" module.

- Select the step in which you want to apply the displacement.

- Choose “Displacement/Rotation”.

- Select the nodes/regions where you want to apply the displacement.

- Define the U1, U2, or U3 (depending on your model's orientation) as 2 mm.

### Step 2: Apply Strain Rate

Applying a predefined strain rate is not as direct as applying displacement. The strain rate can often be applied indirectly by using a predefined field or amplitude. This process might involve defining a smooth amplitude of load or displacement that causes the material to deform at the desired strain rate, which you'd specify:

1. **Predefined Fields**: Go to "Predefined Fields" under the "Field" module.

- Select "Mechanical".

- Choose "Rate" for strain rate or "Plastic Strain Rate", depending on your application.

- Define the strain rate value.

2. **Amplitude**: To control the rate indirectly using displacement or load, create an amplitude under "Loads" > "Amplitude". Define an analytical expression or tabular data that complies with a 0.05 strain rate based on your material and geometric conditions.

3. **Apply Load/BC**: Then apply a load or boundary condition and associate it with the defined amplitude to impose a strain rate indirectly.

### Sample Abaqus CAE Steps for Strain Rate through Amplitude:

- **Step 1**: "Amplitude" > "Create" > Name it and choose "Tabular" > Input time vs magnitude data that follows the desired strain rate indirectly. For a constant strain rate, this might be a linear relation, but ensure this by checking the applied strain in output.

Example:

```

Time: 0, 1, 2, 3, ...

Magnitude: 0, 0.05, 0.1, 0.15, ...

```

- **Step 2**: "Load" or "Boundary" > Associate it with the defined amplitude.

### Note:

- Ensure to use an appropriate material model that can capture the behavior under strain rate conditions.

- Use a sufficiently fine mesh and small time increment to accurately capture the behavior under imposed displacement and strain rate.

- After running the analysis, check whether the desired 0.05 strain rate is achieved by plotting strain vs. time and calculating the rate.

Ensure to validate your model by comparing results with expected or experimental outcomes to ensure accuracy and feasibility in simulations. If the predefined field does not provide the control you need, you may resort to using a user-defined subroutine (e.g., `VUMAT` or `UMAT`) to have a more customized approach towards applying strain rate.