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    Patch In January 2010 a consortium of 15 organisations from eight European countries have kick started a European FP7 funded project on Composite Patch Repair for Marine and Civil Engineering Infrastructure Applications Co Patch Co Patch is a novel and potentially effective repair and or reinforcement method for large steel structures Two basic structural types will be dealt with namely marine structures mainly steel ships and iron steel civil engineering structures e g bridges transmission towers etc It is hoped that the use of patches will significantly reduce the maintenance costs and in the case of metallic bridges prolong their design life and help address the consequences of increasing live loads The proposed technology creates a new market and gives the partners the capability of providing high technology and high added value services worldwide Composite material patching is a very promising method for repairing and or reinforcing metallic structures Composite patching has proven its effectiveness and cost benefits in the aerospace industry for several years now In aerospace applications composite patches have been shown to prevent crack growth and extend the lifetime of the repaired structure In this context a composite patch works as a crack arrestor by decreasing the stress in the area of the crack tip One of the aims of Co Patch is to investigate whether this is also true for cracks in the marine and civil environments Composite patching may also be considered in mitigating the effects of corrosion and loss of section This is a novel effective repair and or reinforcement method for large steel structures with defects Two basic steel structural types will be dealt with in this work namely marine structures mainly ships and steel civil engineering structures e g bridges Co Patch reduces quite significantly the maintenance costs of many large steel

    Original URL path: http://www.co-patch.com/ (2016-04-26)
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  • Contact Us - Co-Patch
    NTUA Greece NTNU Norway SSA United Kingdom TWI Ltd United Kingdom UniS United Kingdom UM Norway Stakeholders Publications Links News Events Newsletter Newsletter Issue 1 Newsletter Issue 2 Newsletter Issue 3 Members Area Co Patch Partner sign in Username Password Forgot password Contact us Please complete the form below and click Submit First Name Surname E mail Message Dr Mohsen Zakikhani TWI Project Leader contactus co patch com TWI Ltd

    Original URL path: http://www.co-patch.com/contact/ (2016-04-26)
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  • Sitemap - Co-Patch
    CARDAMA Spain CETENA Italy ENP Portugal HRS Greece ISQ Portugal METTLE France NTUA Greece NTNU Norway SSA United Kingdom TWI Ltd United Kingdom UniS United Kingdom UM Norway Stakeholders Publications Links News Events Newsletter Newsletter Issue 1 Newsletter Issue 2 Newsletter Issue 3 Members Area Co Patch Partner sign in Username Password Forgot password Site Map Home Project Outline Partners Stakeholders Publications Links News Events Members Area members only Notices

    Original URL path: http://www.co-patch.com/sitemap/ (2016-04-26)
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  • Technical Objectives - Co-Patch
    About the Project Concept The basic concept of the present work is the definition of a new effective repair and or reinforcement method for large steel structures with defects Two basic steel structural types will be dealt with in this work namely marine structures mainly ships and steel civil engineering structures e g bridges Many of the major problems that these structures face during their operational life are common with fatigue playing a predominant role among them Repeated loading is a very common loading condition for both these structures which in areas of stress concentrations leads to the initiation and growth of fatigue cracks These cracks if not detected and properly repaired in time can grow to critical lengths and result in catastrophic structural failures An additional structural problem of either marine or other large steel structures is corrosion particularly for vessels and structures designed with thinner plating due to the use of higher strength steels Corroded plating or beams jeopardise the strength and stiffness of the structure and measures have to be taken to reinstate the original structural characteristics Besides the above two major defects of the steel structures there is often the need for upgrading the strength and

    Original URL path: http://www.co-patch.com/project/ (2016-04-26)
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  • Technical Objectives - Co-Patch
    The traditional ways to deal with such problems are well known Fatigue cracks in welds or panels usually involve renewal of part of the weld welding in the cracks in a panel or replacement of the whole parent panel itself The standard way to face heavy corrosion is also the replacement of the corroded structural members whereas the use of bolted or welded doubler plates seemed to be the only way until now to reinforce a structural part There are circumstances however when these repair or reinforcement approaches are either time consuming and costly or simply impossible to be followed A classical example is the condition where the whole structure is under significant loading due to its own weight especially tension and therefore the use of any welding is prohibitive Cutting off and replacing a structural member is also out of question or necessitates a very costly support of the structure Conditions like this are quite often encountered in steel bridges or bridge type structures such as the big gantry cranes of the shipyards or other large port cranes Regarding this last application in particular several problems are noticed nowadays since there are several big size gantry cranes worldwide many of them in Europe approaching or having passed their initial fatigue life Another disadvantage of the traditional repair methods is that the execution of hot sparking works associated with welding in a highly explosive environment such as the ship holds e g of a hydrocarbon tanker or of a hazardous products cargo ship and fuel tanks necessitates a very careful and complicated preparation and is possible only under severe safety precautions This in turn can have a substantial effect on the cost of the repair since the ship can stay out of operation for a relatively long period Finally the

    Original URL path: http://www.co-patch.com/project/techniques.jsp (2016-04-26)
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  • Technical Objectives - Co-Patch
    of the crack tip in the case of cracked structures A part of the applied load is transferred from the base plate through an adhesive layer to the composite patch thus reducing the stress levels in the substrate Composite patching has proven its effectiveness and cost benefits by its application in the aerospace industry for several years now since there are already several thousands of operating patches in various aluminium aircraft structural parts However there are several fundamental differences between the aerospace applications and bridge marine offshore steel applications which dictate a separate approach and investigation of the problem These differences include the different stiffness of the base metal stiffer steel versus the more similar to composites flexible aluminium the completely different geometries involved significantly thicker plating and larger beams in steel structures the different loading cases and the different operating and environmental conditions Furthermore there are big differences between what is widely accepted as normal repair cost in an aerospace structure and its steel marine bridge counterpart Composite patch repairs and or reinforcements overcome many if not all the aforementioned disadvantages of the traditional methods They do not involve hot works in any way and therefore existing deadweight loading or proximity to explosive environments has no particular consequences Patches can be applied directly on corroded steel members by performing a simple surface preparation thus removing the need for replacement They can be completed faster They exhibit good fatigue resistance They do not cause stress concentrations They result in low added weight All these innovations reduce significantly the cost and the time of the repair or reinforcement However there are some parameters of the procedure that still need further investigation the most crucial among them being the uncertainty about the long term performance of a steel to composite adhesive joint

    Original URL path: http://www.co-patch.com/project/art.jsp (2016-04-26)
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  • Technical Objectives - Co-Patch
    and experimental testing that the use of fibre reinforced composite patch repairs leads to the reinforcement of a steel structural member either by increasing its load carrying capacity or in the case of a defected structural member e g cracked buckled or corroded by reinstating its structural integrity Establishing a stakeholders forum to discuss and agree the business and regulatory implications of introducing composite patch repairs Determining evaluating and quantifying the efficiency of composite patch reinforcements in the marine bridge environment in both the short and long term via an understanding of material degradation modes and their impact on mechanical properties and structural integrity of the steel to composite system Developing proper numerical modelling procedures for modelling a composite patch reinforced structure and by drawing out general guidelines for performing such numerical simulations Developing a generalized procedure for the design of composite patch reinforcements in steel marine and civil engineering infrastructure applications leading to the selection of the proper surface preparation techniques adhesives reinforcing composite material configuration number of layers stacking sequence geometry of the reinforcement etc Evaluating existing or developing new practically applicable and sensor based monitoring techniques of the initial quality and the final through life structural integrity of the patch Providing pre designed ready made composite patch solutions for repairing or reinforcing standard problematic cases of a steel marine or civil engineering structure Developing best practice generalized procedures for the application of composite patch repairs which could be followed in situ by properly trained personnel and which will finally lead to the classification of composite patches as permanent repairs Demonstrating the effectiveness of the developed design tools and procedures through full scale tests of patch repaired structures Disseminating the results of the project to the corresponding administrative bodies i e maritime authorities railways or highways authorities port

    Original URL path: http://www.co-patch.com/project/objectives.jsp (2016-04-26)
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  • Technical Objectives - Co-Patch
    Issue 2 Newsletter Issue 3 Members Area Co Patch Partner sign in Username Password Forgot password Co Patch Project Progress beyond the state of the art The vast majority of the available literature about composite patch repairing refers to aluminium structures in the aerospace sector where the thickness of patches is very small usually less than 3 mm Few real applications have been documented on steel structures in the civil

    Original URL path: http://www.co-patch.com/project/beyond.jsp (2016-04-26)
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