This Tutorial of Conditions in SolidWorks Simulation

Some common reasons for error include making invalid assumptions, setting incorrect boundary conditions, setting incorrect material properties, and general numerical errors. As an example, let’s consider the stress analysis of a typical model. One can assume a linear stress-strain relationship before the yield strength of the material is reached. The model produces incorrect results as stress or strain increase to the point of nonlinearity on the stress-strain curve.

Setting appropriate boundary conditions SolidWorks Simulation  can be more difficult than one might first expect, and it is easy to overlook boundaries (such as the initial temperature of an object). This can result in nonsensical default values being used for the simulation. Obtaining accurate physical parameters for your materials can also be difficult, especially if you are using nonstandard or unusual materials.

FEA inherently discretizes the object being studied. The number of elements used presents a tradeoff between runtime and accuracy.

(Conditions in SolidWorks Simulation)

Before you trust your FEA results, you should plan for a significant validation process. If possible, the best place to begin the validation process is with a simple model that can be solved analytically. Check that the FEA simulation produces comparable results. For example, before looking at bending in an array of bolted-together I-beams, compare the FEA results for bending in a single I-beam to analytical results. Be sure you are using the appropriate material parameters. Another important model validation technique is to compare the FEA results to an actual physical prototype using simple stimulus, such as an impulse. Beware of making claims about the FEA model results that you cannot independently support with other analysis or measurement.