Structural Integrity of Metallic Structures
The Mechanics of Materials Division has over 30 year experience in ‘Structural Integrity’ of metallic materials based research, involving experimental testing, numerical modelling and the verification of component lifing methods which are associated with failures due to brittle, ductile, fatigue and creep fracture. The main aim has been directed towards developing techniques for predicting failure using fracture mechanics, continuum damage mechanics and micro to meso-scale modelling techniques, which are validated through appropriate experiments.
The division has collaborated with industry and international research establishments on numerous multi-disciplinary projects dealing with different aspects of fracture occurring at a range from cryogenic to very high temperatures. In particular, the main impetus has been in the field of high temperature creep/fatigue crack growth by considering the experimental and metallurgical aspects, micro‑models and numerical predictions associated with it. A considerable knowledge base has been accumulated on advanced steels, single crystals and high temperature protective coatings. The consequent product of this research has been the development of life assessment codes that have been adopted by a range of industrial bodies. Substantial input has been made to a number of codes including BS7910, ASTM, ASME, API, British Energy R6/R5 codes, ISO standards dealing with residual stresses and component creep/fatigue testing and also the design code for the ITER super magnet structure which includes fatigue fracture criteria for cracked components.
email: Kamran Nikbin
List of Publications
Relevant Links: Structural Integrity-RCA
Zhao L, Xu L, Nikbin K, 2017, Predicting failure modes in creep and creep-fatigue crack growth using a random grain/grain boundary idealised microstructure meshing system, Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, Vol:704, ISSN:0921-5093, Pages:274-286
et al., 2017, Predicting the influence of strain on crack length measurements performed using the potential drop method, Engineering Fracture Mechanics, Vol:182, ISSN:0013-7944, Pages:635-657
Biglari FR, Nikbin KM, 2017, Numerical predictions of carburisation and crack evolution using a combined diffusion rate and remaining multi-axial creep ductility damage model, International Journal of Damage Mechanics, Vol:26, ISSN:1056-7895, Pages:859-880
Nikbin K, 2017, A unified multiscale ductility exhaustion based approach to predict uniaxial, multiaxial creep rupture and crack growth, Engineering Fracture Mechanics, Vol:179, ISSN:0013-7944, Pages:240-259
et al., 2017, Quantification of residual stresses in electron beam welded fracture mechanics specimens (vol 106, pg 106, 2017), International Journal of Solids and Structures, Vol:113, ISSN:0020-7683, Pages:255-255