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BEASY Corrosion & Fracture Simulation
2013 Highlights
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2013 has been an exciting year with many new developments and significant expansion of the BEASY team. In this newsletter, we recap on some of the news stories we think you will find of interest.
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The BEASY offices in the UK and USA will be closed for the Christmas and New Year holidays, but if you would like to learn about any of the items below, or if you have a project which you would like to discuss, please contact us. With Seasons Greetings from the BEASY team
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Corrosion Modelling Services
In recent years BEASY has seen a significant increase in its corrosion modelling services business and to meet this demand a number of new members of staff have joined the company this year.
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Matthew Emery, Louise Orcheston-Findlay,
Guy Bishop and Phillip Coles join the BEASY team
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The starting point for BEASY modelling projects is working with the client to develop an agreed set of objectives and to define the methodology and the deliverables. The BEASY simulation provides the client's CP responsible authorities with a thorough understanding of the behaviour of the structure, and its response to alternative CP systems/parameter studies to assist in the selection of the final CP design solution.
Projects have included:
Water lift caissons, where modelling has embraced the effects of different metals (eg lift column and pump), the effects of geometries on current flow, and the impact of water flow rates on current density requirements
Buried storage tank farms (eg LNG), where modelling has identified the protection achieved incorporating the influences of reinforced concrete footings (for pipe racks etc), and providing input to aid selection of appropriate reference electrode locations
FPSO and associated structures, where modelling has been used to assess interference effects between the CP systems, and for a number of sub-structures to determine the distribution of protection resulting from restrictions to current flow imposed by geometry
Well casings, assessing the impact of interference effects from other structures
Pipeline arrangements, where modelling has assessed complex attenuation effects
Offshore jacket structures, where modelling has been used to achieve optimal distribution of sacrificial anodes.
For more information please contact us.
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 Predicting Ballast Tank Corrosion Through Computer Modeling
BEASY was featured in the September 2013 issue of Materials Performance (MP) which is the world's largest circulation journal dedicated exclusively to corrosion prevention and control.
The article discussed some recent projects using computer modelling to predict the performance of ballast tank corrosion control systems.
To view the article, please click here
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Crack Growth Analysis Of A Riveted Fuselage Skin 
Sharon Mellings presented a paper with Robert Adey and Roberto Citarella of the University of Salerno at the 35th International Conference on Boundary Elements and Other Mesh Reduction Methods on some new developments to improve the modelling of cracks in aircraft structures. Generally aircraft structures are highly complex, involving complex load paths, however cracks are often localised features involving just a few of the structural components. One particular location for damage is near to riveted connections where localised forces can lead to fatigue damage problems. These areas can be where stiffening ribs are attached to the aircraft skin, where two or more skin sections are overlapped or where holes in the skin are covered by additional doubler panels.
The paper presented a model which can be used to predict the crack growth path and residual strength of the structure. The simulation technology was tested by applying it to a large scale structure consisting of a number of panels stiffened by ribs and stringers. Virtual Testing of the structure was performed to predict the structural failure due to crack growth and the estimated fatigue life of the structure.
For more information on the paper, or for more information on BEASY Crack Growth simulation services and software, please contact info@beasy.com
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Aluminium Alloy Corrosion of Aircraft Structures: Modelling and Simulation
BEASY contributed to a new book on the modelling and simulation of corrosion in aircraft structures. The book is based on the research and development performed as part of the SICOM project which included aircraft manufacturers AIRBUS and EADS, BEASY and a consortium of university research centres.
This technology was used to develop the BEASY galvanic corrosion simulation tools for aircraft structures.
Please click here for more information
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Design & Analysis of Engineered Residual Stress Surface Treatments for Enhancement of Aircraft Structure
In Damage Tolerant Design the assumption that cracks already exist can lead to overly heavy designs without the consideration of surface and near surface stress distributions. Practical experience and accumulated data have shown surface, near surface and sub-surface stresses are very important to the growth of fatigue cracks and need to be considered when predicting how cracks grow.
There are many ways to introduce and manage residual stresses, among them: cold working techniques, such as shot peening, laser shock peening, ultrasonic peening, planishing, hammering, burnishing, low plasticity burnishing, rolling, coining and split sleeve expanding etc. These can be used to generate compressive residual stresses which can retard the growth of a crack. This is because the stress the crack experiences in the material at a given location is equal to the residual stress plus the applied stress. Therefore if the residual stress is compressive at a location and the applied load is tensile the residual stress can cancel out part, or the entire, applied load and thereby restrict the crack from opening.
BEASY have been working with some of our aerospace customers to develop simulation tools and technologies to simulate the growth of 3D cracks in residual stress fields. In a recent paper presented at the ASIP 2012 conference BEASY was used as part of a study entitled "Design And Analysis Of Engineered Residual Stress Surface Treatments For Enhancement Of Aircraft Structure" authored by engineers from Hill Engineering, Boeing and the Airforce Research Laboratory.
For more details about the paper, please click here
For more information about BEASY, please contact info@beasy.com
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Training
Courses are held regularly at BEASY's offices near Southampton in the UK, and at Billerica, Massachusetts in the USA.
Courses are also held at customers' sites and can be tailored to meet the specific needs of the client.
To discuss your requirements further, please contact us. |
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