LS-DYNA Discrete Element Method Analysis for Load Analysis of Mining Dump Truck Body

Discrete Element Method: Rock Drop Test of Dump Truck Body
Analysis: 
LS-DYNA

Discrete element method (DEM) is used to create accurate transient loading for a large-scale mining dump truck body

The discrete element method was used to simulate the load carrying capacity of a mining dump truck body. The LS-DYNA analysis investigated the stress response of the dump truck body during the shovel drop of a rock load. Figure 1 shows the basic setup of the model from initial loading of the shovel to final drop of the idealized rocks. The drop-test analysis work was used to bound a static stress analysis of the dump truck body. The finite element mesh was purposely made very coarse (see Figures 2 and 3) to provide rough estimates of the peak stresses during the loading operation.

The client used these results to further optimize the dump truck body and guide the overall design process.

Figure 1:  LS-DYNA simulation of shovel dropping rocks into mining dump truck bed.

Figure 1:  LS-DYNA simulation of shovel dropping rocks into mining dump truck bed.

Various sized rocks were mixed together to represent one possible scenario of worst-case rock drop into the open-pit mine truck body.

 

Figure 2:  Transient stress analysis results from rocks hitting dump truck bed.

Figure 2:  Transient stress analysis results from rocks hitting dump truck bed.

With LS-DYNA, the DEM simulation is tightly coupled to the Lagrangian elements that are used in the dump truck bed. This DEM to FEA coupling allows one simulation to capture the dynamic loading due to rock drop onto the truck bed body and into the frame.

 

Figure 3:  Transient stress results at an element within the body of the dump truck.

Figure 3:  Transient stress results at an element within the body of the dump truck.

FEA sensors are set at the frame points to record the transient shock load from the DEM rock drop into the dump truck body.

 

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