29/04/2026
Key Technical Breakdown
Stress Concentration (Red Zones): The highest stress (peaking near 600 MPa) is concentrated at the first engaged thread between the nut and the bolt. This is a classic failure point in mechanical engineering because the first thread carries a disproportionate amount of the total load.
Fillet Stress: There is another significant stress concentration at the junction between the bolt shank and the bolt head. This is why radius fillets are critical in bolt design to reduce the likelihood of the head snapping off.
Deformation (Scaled): The text indicates a "Deformation: 20x" scale. This means the visual stretching of the bolt is exaggerated by 20 times to make the movement visible to the human eye. The actual maximum displacement is only 0.15 mm.
Material Properties: The assembly is noted as Steel Grade 8.8.
Yield Strength: Approximately 640 \text{ MPa}
Tensile Strength: Approximately 800 \text{ MPa}
Since the peak stress shown is 600 \text{ MPa}, the bolt is operating near its elastic limit but hasn't reached the yield point yet.
Structural Observations
The Flanges (A & B) are being pulled apart, which creates a gap at the interface. This simulation is useful for determining if the chosen bolt grade and torque are sufficient to maintain a "tight" connection under the working load. If the gap becomes too large, the joint could lose its integrity or succumb to fatigue over time.
