Design verification for USA Market: Autoclave flange
In our effort to certify four autoclave series with quick-acting closures and U & U2 Stamps, we encountered a significant challenge due to an unusual component. The ASME VIII design code requires careful attention to detail, including cyclic analysis, to meet strict safety standards.
By using Finite Element Analysis (FEA), we simulated and evaluated the special flange. Our main challenge was dealing with low-cycle fatigue in a specific weakened area under various types of stress, all without changing the main dimensions. Additionally, we improved the design to reduce stress points, ultimately extending the lifespan of the equipment.
Project takeaways - Extending Lifespan:
- Integrating closed-form equations (Design by Formulas) for conventional geometries and FEA simulation (Design by Analysis) for intricate geometries proves to be a cost-effective approach for equipment assessment.
- Even a slight increase in stress, whether from loads or geometry, can significantly reduce fatigue life.
- Early identification of the fatigue region (low or high cycle regime) is essential to perform design modifications in advance.
- Extending lifespan through minor design adjustments is possible.
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