In the lsdyna basic tutorial, we made a particle about a rigid ball hitting an elastic plate. Now we consider another question, what if an elastic ball hits a rigid ground? Do you want to start modeling from scratch, and are the steps the same? It's actually very simple, just swap the material properties of the ball and the ground. The specific operation is to set the material property of plate to rigid ( No. 20 material) and the material property of ball to plastic ( No. 24 material) when assigning attributes to each part , as shown in Figure 1.
Figure 1 Assign part attribute
If the ball is a rigid body, you need to consider the influence of its gravitational acceleration. To set the gravitational acceleration, you must first load the curve, enter keyword->define->curve, and the response settings are as shown in the figure below, enter the corresponding value in A1/O1, and click insert to insert , click on plot to draw the loading curve. Since the acceleration of gravity always exists from 0-1s, the loading curve is a straight line. Many people may ask why it is not 9.8, because now we just use 1 to initialize the curve, and then we need to continue to define the keyword load_gravity_part in load. SFA/SFO is the scaling factor of the abscissa and ordinate, due to our unit system. relationship, the time is ms, the gravitational acceleration should be 9.81e-3, so the SFO should be set to 1e-3.
Enter load->load_gravity_part, set the part that needs to apply gravitational acceleration, the loading curve, the direction of gravitational acceleration, and the value of gravitational acceleration ( 9.8), and click accept to complete the setting.
Figure 2 Defining the gravity acceleration loading curve
Figure 3 Unit system
Figure 4 Applying gravitational acceleration
The simulation results are shown in the following figure:
0.0ms
0.0798ms
0.2798ms
0.509ms