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Design of Adhesive Joints Under Humid Conditions pp 123–146Cite as

Prediction of Joint Strength Under Humid Conditions: Damage Mechanics Approach

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Part of the book series: Advanced Structured Materials ((STRUCTMAT,volume 25))

Abstract

Damage mechanics is a tool that is used to model the deterioration of a material under load, ultimately leading to failure. This is achieved through an association of the properties representing the mechanical behaviour of the material with the effects of loads acting upon it, often via a defined damage variable. The result is the representation of micro-damage as a reduction in the material properties in a damage or process zone in which the effects of the loads are great enough to initiate damage but less than that to cause complete failure. This will affect the response of the structure to further loading and hence damage mechanics is often applied in a progressive fashion. In this way, the method is able to predict not just the final failure load of a structure, but can also predict the state of damage and response to loading at any point in the load-time history. Two forms of damage modelling have been applied to adhesively bonded joints, those based on cohesive zone laws and those based on continuum damage mechanics, with the former being more common. These methods are now well developed and have been validated for a number of different adhesive joint types. Although there have been few applications of damage mechanics to environmentally aged joints to date, the published work indicates that it can be practically applied to the prediction of the effects of the environment, specifically moisture and temperature, on bonded joints and that the technique can offer certain advantages in the representation of the response of adhesives in these conditions compared with alternative analysis methods. Further development and validation of these techniques are still required and it would also be useful to develop simplified analysis tools based on the damage mechanics methods for the non-specialist designer. However, the results from the studies to date have clearly shown the potential of these methods.

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Acknowledgements

The authors would like to acknowledge the contributions of fellow researchers and PhD students including, Dr Keat Loh, Dr. David Liljedahl, Dr. Yongxia Hua, Dr. Furo Jumbo and Dr. Aamir Mubashar. We also gratefully acknowledge the financial support of DSTL and the technical input from Industrial collaborators BAe Systems, Airbus and MBDA.

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Authors and Affiliations

  1. Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK

    Ian A. Ashcroft

  2. Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK

    Andrew D. Crocombe

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  1. Ian A. Ashcroft
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  2. Andrew D. Crocombe
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Correspondence to Ian A. Ashcroft .

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Editors and Affiliations

  1. , Department of Mechanical Engineering, University of Porto, Rua Dr. Roberto Frias, Porto, 4200-465, Portugal

    Lucas F. M. da Silva

  2. , Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta-cho,Midori-ku 4259, Yokohama, 226-8502, Japan

    Chiaki Sato

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Ashcroft, I.A., Crocombe, A.D. (2013). Prediction of Joint Strength Under Humid Conditions: Damage Mechanics Approach. In: da Silva, L., Sato, C. (eds) Design of Adhesive Joints Under Humid Conditions. Advanced Structured Materials, vol 25. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37614-6_7

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