Finite Element Analysis provides data to foretell how a seal product will perform underneath sure situations and may help determine areas the place the design can be improved without having to check a number of prototypes.
Here we explain how our engineers use FEA to design optimal sealing options for our customer purposes.
Why do we use Finite Element Analysis (FEA)?
เกจวัดแก๊ส encounter many crucial sealing purposes with complicating influences. Envelope measurement, housing limitations, shaft speeds, pressure/temperature rankings and chemical media are all utility parameters that we should contemplate when designing a seal.
In isolation, the impression of those utility parameters within reason straightforward to foretell when designing a sealing answer. However, whenever you compound numerous these elements (whilst often pushing a few of them to their upper restrict when sealing) it’s essential to foretell what will occur in real application situations. Using FEA as a tool, our engineers can confidently design after which manufacture sturdy, dependable, and cost-effective engineered sealing solutions for our prospects.
Finite Element Analysis (FEA) allows us to understand and quantify the results of real-world circumstances on a seal half or assembly. It can be utilized to establish potential causes where sub-optimal sealing efficiency has been noticed and can additionally be used to information the design of surrounding elements; especially for merchandise such as diaphragms and boots the place contact with adjacent parts might must be averted.
The software program also permits pressure information to be extracted in order that compressive forces for static seals, and friction forces for dynamic seals may be precisely predicted to assist customers in the ultimate design of their products.
How do we use FEA?
Starting with a 2D or 3D mannequin of the initial design idea, we apply the boundary conditions and constraints equipped by a buyer; these can embody strain, pressure, temperatures, and any applied displacements. A appropriate finite element mesh is overlaid onto the seal design. This ensures that the areas of most curiosity return accurate outcomes. We can use bigger mesh sizes in areas with less relevance (or decrease levels of displacement) to minimise the computing time required to unravel the model.
Material properties are then assigned to the seal and hardware components. Most sealing supplies are non-linear; the amount they deflect underneath a rise in pressure varies relying on how massive that drive is. This is not like the straight-line relationship for many metals and rigid plastics. This complicates the fabric model and extends the processing time, however we use in-house tensile check facilities to precisely produce the stress-strain material fashions for our compounds to ensure the analysis is as representative of real-world performance as attainable.
What happens with the FEA data?
The analysis itself can take minutes or hours, relying on the complexity of the half and the vary of working conditions being modelled. Behind the scenes in the software program, many hundreds of hundreds of differential equations are being solved.
The results are analysed by our experienced seal designers to establish areas where the design could be optimised to match the precise requirements of the applying. Examples of those requirements might include sealing at very low temperatures, a must minimise friction ranges with a dynamic seal or the seal might have to face up to high pressures without extruding; whatever sealing system properties are most important to the shopper and the appliance.
Results for the finalised proposal can be introduced to the customer as force/temperature/stress/time dashboards, numerical knowledge and animations exhibiting how a seal performs throughout the analysis. This information can be utilized as validation information in the customer’s system design course of.
An example of FEA
Faced with very tight packaging constraints, this buyer requested a diaphragm component for a valve utility. By using FEA, we have been in a place to optimise the design; not solely of the elastomer diaphragm itself, but also to propose modifications to the hardware parts that interfaced with it to extend the available space for the diaphragm. This stored materials stress levels low to take away any chance of fatigue failure of the diaphragm over the life of the valve.
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