Design and Technology – Graphics | e-Consult

CAD software offers several tools for analysing the structural integrity of a chair design. These tools allow the student to simulate real-world loads and stresses on the chair, identifying potential weak points before physical prototyping. Here are some examples:

• Finite Element Analysis (FEA): This is a powerful technique where the CAD model is divided into small elements. The software then calculates the stress and strain on each element under applied loads (e.g., a person sitting on the chair). FEA can highlight areas of high stress concentration, indicating where the design needs to be modified for increased strength.
• Stress Analysis Tools: Many CAD packages have built-in stress analysis tools that allow the user to apply forces and pressures to the model and visualise the resulting stress distribution. This can be done by defining load cases (e.g., static load, dynamic load).
• Sectioning and Cross-Section Analysis: The CAD model can be sectioned to examine the cross-sectional geometry of the chair components. This allows the student to verify that the dimensions are sufficient to withstand the expected loads. For example, the thickness of a chair leg can be checked to ensure it won't buckle under pressure.
• Simulation of Movement: More advanced CAD software can simulate the movement of the chair under different conditions. This can help identify potential failure points caused by repetitive stress or bending.

By using these features, the student can iterate on the design, making adjustments to the shape, dimensions, and material thickness to optimise the chair's structural integrity. This reduces the need for costly and time-consuming physical prototypes.