Wie wenden Sie Randbedingungen und Lastvektoren in der FEM in Solidworks an?

It is very important to take into consideration the 'real life' application that one is trying to run on FEA when assigning the boundary conditions. A proper understanding of the mechanics involved in the real life application could help in the process of determining what kind of loading and/or boundary conditions need to be applied in the FEA simulation. I like to think that there is an inverse relationship between how much/what kind of boundary conditions are implemented against the accuracy if the final results. FEA users must keep that in mind when making this decision.

🫥Boundary conditions (#BC) and Loading Conditions (#LC) for a Finite Element Model (#FEM) are determined by setting up a free body diagram (FBD) 👋The FBD analysis is usually done “by hand” outside the FEM software as part of model setup ➡️A Free body diagram (FBD) is used to show relative #magnitude and #direction of all #forces acting upon an object in a given #situation 🍎By applying #Newton’s Laws of Motion and determining the vector sum of the applied forces, one can determine #magnitude, #direction, and #location of applied forces in the FEM LC’s 🌳BC’s also determined from FBD; these could be fixed points in space or partially #constrained motion; they are then applied to the FEM #simulation #physics #computation #engineering

Boundary Conditions: Constraints defining how a structure interacts with its surroundings. Types include fixed points, rotational freedom, symmetry, and remote displacements. Proper definition is crucial for accurate simulations. Load Vectors: Represent applied forces, pressures, or thermal loads. Types include force, pressure, temperature, and gravity loads. Accurate representation is vital for predicting a structure's response to external forces.

The most common error in FEA is the constraints. To many or to much constraints make your model to stiff. A too stiff model gives incorrect defelctions and thus incorrect stresses. Use gravity to judge the stiffness of your model.

In Solidworks FEA, applying boundary conditions and load vectors is key. Define constraints to simulate real-world scenarios. Specify fixed or restrained points as boundaries. For load vectors, determine forces or pressures impacting the model. Carefully assign magnitudes and directions. Precision matters; ensure realistic simulation. In mastering boundary conditions and load vectors, you sculpt simulations that mirror the intricacies of the physical world within the digital realm

In SolidWorks Simulation: Boundary Conditions: Fixture: Choose faces or edges to fix or restrict movement. Force: Apply forces along specified directions and magnitudes. Pressure: Apply pressures on surfaces in the desired direction. Gravity: Set gravitational effects on the model. Load Vectors: Fixture PropertyManager: Assign constraints to faces or edges. External Loads PropertyManager: Apply forces, pressures, temperatures, and gravity effects to simulate real-world conditions. Enter values and directions for each load.

True fixed - fixed or pinned bcs are easily simulated in FE models but seldom physically exist in nature! Bcs are often a function of loading and friction.

Verify Boundary Conditions: Check the applied fixtures and constraints in the "Simulation Study Tree." Use the "Mesh Plot" to inspect mesh quality; irregularities may indicate improper constraints. Review the results for unexpected displacements or unrealistic behavior. Verify Load Vectors: Inspect the "External Loads" section in the "Simulation Study Tree" to confirm applied forces, pressures, temperatures, and gravity. Use the "Results" section to evaluate the effects of loads on the model's behavior. Compare simulation results with expectations based on real-world conditions.

To ensure that the applied boundary conditions are fully constrained, follow these steps: Right-click on "Connections" in the study tree, then select "Underconstrained Bodies." Click "Calculate" to verify whether the model is fully constrained. This process will identify any remaining degrees of freedom in the model.

Modify Boundary Conditions: Right-click on a fixture in the "Simulation Study Tree" and choose "Edit Definition" to adjust constraints. To change applied forces, right-click on a force in the tree and select "Edit Definition." Modify Load Vectors: Edit applied loads by right-clicking on forces, pressures, or temperatures in the "Simulation Study Tree." Adjust values, directions, or locations in the respective PropertyManagers. After modifications, re-run the analysis to observe the updated effects.

Interpret Boundary Conditions: Check fixed constraints on faces or edges; immovable parts are indicated. Review applied rotations or symmetry constraints. Inspect remote displacements for external influences. Analyze the "Mesh Plot" for irregularities, ensuring proper constraints. Interpret Load Vectors: Verify forces, pressures, and temperatures in the "Simulation Study Tree." Evaluate gravity effects and ensure proper direction. Use results to understand how loads influence the structure; deformations, stresses, and displacements provide insights into the model's behavior.

It is important to understand how stress flows in your design, most hot spots can occur around sharp edges and contact points and can cause extreme spikes in results.

Be aware the using soft springs can modify the end results for deflection and other criteria. Soft springs are useful, but should only be used with the engineers discretion to reduce 'noisy' evaluations.

Sometimes, your FEA is failing for a really good reason. One time I had a retaining ring popping out of a groove and 'excessive displacements' were evaluated by the model and crashing my FEA analysis. After reducing the load in the design I found that the retaining ring was a hot spot on my design and needed extra clearance.