Finite Element Analysis supplies data to predict how a seal product will perform underneath sure circumstances 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 optimal sealing solutions for our customer functions.
Why can we use Finite Element Analysis (FEA)?
Our engineers encounter many important sealing applications with complicating influences. Envelope dimension, housing limitations, shaft speeds, pressure/temperature rankings and chemical media are all application parameters that we should contemplate when designing a seal.
In isolation, the impression of those application parameters is fairly simple to foretell when designing a sealing answer. However, if you compound a selection of these factors (whilst usually pushing a few of them to their upper limit when sealing) it’s essential to predict what is going to happen in actual utility circumstances. Using FEA as a tool, our engineers can confidently design and then manufacture robust, reliable, and cost-effective engineered sealing options for our clients.
Finite Element Analysis (FEA) permits us to know and quantify the effects of real-world situations on a seal part or assembly. It can be utilized to determine potential causes where sub-optimal sealing performance has been noticed and may also be used to guide the design of surrounding parts; particularly for merchandise such as diaphragms and boots the place contact with adjacent components may need to be averted.
The software program also allows pressure data to be extracted in order that compressive forces for static seals, and friction forces for dynamic seals may be accurately predicted to assist customers in the last design of their merchandise.
How will we use FEA?
Starting with a 2D or 3D model of the preliminary design concept, we apply the boundary conditions and constraints supplied by a customer; these can embrace strain, force, temperatures, and any utilized displacements. A appropriate finite element mesh is overlaid onto the seal design. This ensures that the areas of most curiosity return correct outcomes. We can use bigger mesh sizes in areas with less relevance (or lower levels of displacement) to minimise the computing time required to resolve the mannequin.
Material properties are then assigned to the seal and hardware parts. ความหมายของเครื่องวัดความดัน sealing supplies are non-linear; the amount they deflect under an increase in force varies relying on how massive that drive is. This is not like the straight-line relationship for most metals and inflexible plastics. This complicates the material mannequin and extends the processing time, however we use in-house tensile test facilities to accurately produce the stress-strain materials fashions for our compounds to make sure the analysis is as representative of real-world efficiency as potential.
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 operating situations being modelled. Behind the scenes within the software, many tons of of 1000’s of differential equations are being solved.
The results are analysed by our skilled seal designers to identify areas where the design could be optimised to match the particular requirements 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 might have to face up to excessive pressures without extruding; no matter sealing system properties are most important to the customer and the application.
Results for the finalised proposal could be introduced to the shopper as force/temperature/stress/time dashboards, numerical knowledge and animations displaying how a seal performs throughout the analysis. This data can be utilized as validation data 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 software. By using FEA, we were able to optimise the design; not solely of the elastomer diaphragm itself, but also to suggest modifications to the hardware parts that interfaced with it to increase the available house for the diaphragm. This saved material stress ranges low to take away any chance of fatigue failure of the diaphragm over the life of the valve.
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