Why Ceetak makes use of Finite Element Analysis

Finite Element Analysis supplies information to foretell how a seal product will operate beneath sure situations and may help determine areas the place the design may be improved with out having to check a number of prototypes.
Here we explain how our engineers use FEA to design optimum sealing solutions for our buyer functions.
Why will we use Finite Element Analysis (FEA)?
Our engineers encounter many crucial sealing purposes with complicating influences. Envelope measurement, housing limitations, shaft speeds, pressure/temperature scores and chemical media are all utility parameters that we must contemplate when designing a seal.
In isolation, the impression of those utility parameters within reason easy to foretell when designing a sealing resolution. However, whenever you compound numerous these components (whilst often pushing some of them to their upper restrict when sealing) it is essential to foretell what will happen in actual software conditions. Using FEA as a tool, our engineers can confidently design after which manufacture robust, dependable, and cost-effective engineered sealing solutions for our customers.
Finite Element Analysis (FEA) permits us to understand and quantify the consequences of real-world situations on a seal part or assembly. It can be utilized to establish potential causes the place sub-optimal sealing efficiency has been observed and may additionally be used to information the design of surrounding components; particularly for products such as diaphragms and boots the place contact with adjoining parts may must be avoided.
The software program additionally allows pressure knowledge to be extracted in order that compressive forces for static seals, and friction forces for dynamic seals could be precisely predicted to help prospects within the final design of their products.
How can we use FEA?
Starting with a 2D or 3D model of the preliminary design concept, we apply the boundary conditions and constraints provided by a buyer; these can embrace stress, pressure, temperatures, and any applied displacements. A suitable finite element mesh is overlaid onto the seal design. This ensures that the areas of most curiosity return correct results. We can use larger mesh sizes in areas with much less relevance (or lower ranges of displacement) to minimise the computing time required to resolve the mannequin.
Material properties are then assigned to the seal and hardware elements. Most sealing supplies are non-linear; the amount they deflect beneath a rise in drive varies depending on how massive that drive is. This is unlike the straight-line relationship for many metals and rigid plastics. This complicates the material mannequin and extends the processing time, but we use in-house tensile check services to accurately produce the stress-strain materials fashions for our compounds to make sure the evaluation is as consultant of real-world efficiency as possible.
What happens with the FEA data?
The evaluation itself can take minutes or hours, relying on the complexity of the part and the vary of working situations being modelled. Behind the scenes within the software, many hundreds of 1000’s of differential equations are being solved.
The results are analysed by our skilled seal designers to identify areas the place the design could be optimised to match the specific requirements of the appliance. Examples of those requirements could embrace sealing at very low temperatures, a need to minimise friction ranges with a dynamic seal or the seal may need to face up to high pressures without extruding; whatever sealing system properties are most important to the customer and the appliance.
Results for the finalised proposal can be presented to the client as force/temperature/stress/time dashboards, numerical knowledge and animations showing how a seal performs throughout the evaluation. No nonsense can be utilized as validation information in the customer’s system design process.
An example of FEA
Faced with very tight packaging constraints, this customer requested a diaphragm element for a valve utility. By using FEA, we have been able to optimise the design; not only of the elastomer diaphragm itself, but additionally to propose modifications to the hardware components that interfaced with it to increase the available area for the diaphragm. This stored material stress levels low to remove any chance of fatigue failure of the diaphragm over the life of the valve.

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