Why Ceetak uses Finite Element Analysis

Finite Element Analysis supplies knowledge to predict how a seal product will operate under sure circumstances and might help establish areas where the design may be improved without having to test a quantity of prototypes.
Here we clarify how our engineers use FEA to design optimum sealing solutions for our buyer functions.
Why do we use Finite Element Analysis (FEA)?
Our engineers encounter many crucial sealing purposes with complicating influences. Envelope dimension, housing limitations, shaft speeds, pressure/temperature rankings and chemical media are all application parameters that we should think about when designing a seal.
In isolation, the influence of those application parameters is fairly easy to foretell when designing a sealing answer. However, whenever you compound numerous these components (whilst often pushing some of them to their higher restrict when sealing) it’s essential to foretell what’s going to happen in actual application circumstances. Using Off-limits as a device, our engineers can confidently design after which manufacture strong, dependable, and cost-effective engineered sealing options for our customers.
Finite Element Analysis (FEA) allows us to understand and quantify the results of real-world conditions on a seal part or meeting. It can be used to establish potential causes the place sub-optimal sealing efficiency has been noticed and can be used to guide the design of surrounding components; particularly for merchandise corresponding to diaphragms and boots the place contact with adjoining elements could have to be avoided.
The software additionally allows pressure data to be extracted so that compressive forces for static seals, and friction forces for dynamic seals can be accurately predicted to assist customers in the final design of their merchandise.
How can we use FEA?
Starting with a 2D or 3D mannequin of the initial design idea, we apply the boundary circumstances and constraints supplied by a customer; these can embrace strain, pressure, temperatures, and any utilized displacements. A suitable finite element mesh is overlaid onto the seal design. This ensures that the areas of most interest return correct outcomes. We can use larger mesh sizes in areas with much less relevance (or decrease ranges of displacement) to minimise the computing time required to solve the mannequin.
Refund are then assigned to the seal and hardware elements. Most sealing supplies are non-linear; the amount they deflect underneath an increase in pressure varies relying on how large that drive is. This is unlike the straight-line relationship for many metals and inflexible plastics. This complicates the fabric mannequin and extends the processing time, but we use in-house tensile test services to precisely produce the stress-strain material models for our compounds to ensure the evaluation is as representative of real-world performance as potential.
What happens with the FEA data?
The analysis itself can take minutes or hours, depending on the complexity of the part and the vary of operating situations being modelled. Behind the scenes within the software, many tons of of hundreds of differential equations are being solved.
The results are analysed by our skilled seal designers to establish areas the place the design can be optimised to match the specific necessities of the application. Examples of those requirements might embody sealing at very low temperatures, a need to minimise friction ranges with a dynamic seal or the seal may have to face up to excessive pressures without extruding; no matter sealing system properties are most important to the customer and the appliance.
Results for the finalised proposal may be introduced to the shopper as force/temperature/stress/time dashboards, numerical knowledge and animations displaying how a seal performs all through the evaluation. This info can be used as validation information within the customer’s system design course of.
An example of FEA
Faced with very tight packaging constraints, this customer requested a diaphragm component for a valve utility. By utilizing FEA, we had been able to optimise the design; not only of the elastomer diaphragm itself, but also to suggest modifications to the hardware elements that interfaced with it to extend the obtainable space for the diaphragm. This stored material stress levels low to take away any risk of fatigue failure of the diaphragm over the lifetime of the valve.
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