Amir, Muhammad and Schmauder, Siegfried and Huang, Yonngang (2007) Fracture of bicrystal metal/ceramic interfaces : a study via the mechanism-based strain gradient crystal plasticity theory. International Journal of Plasticity, 23 (4). pp. 665-689. ISSN 0749-6419Full text not available in this repository. (Request a copy from the Strathclyde author)
Two continuum mechanical models of crystal plasticity theory namely, conventional crystal plasticity theory and mechanism-based crystal plasticity theory, are used to perform a comparative study of stresses that are reached at and ahead of the crack tip of a bicrystal niobium/alumina specimen. Finite element analyses are done for a stationary crack tip and growing cracks using a cohesive modelling approach. Using mechanism-based strain gradient crystal plasticity theory the stresses reached ahead of the crack tip are found to be two times larger than the stresses obtained from conventional crystal plasticity theory. Results also show that strain gradient effects strongly depend on the intrinsic material length to the size of plastic zone ratio (l/R0). It is found that the larger the (l/R0) ratio, the higher the stresses reached using mechanism-based strain gradient crystal plasticity theory. An insight into the role of cohesive strength and work of adhesion in macroscopic fracture is also presented which can be used by experimentalists to design better bimaterials by varying cohesive strength and work of adhesion.
|Keywords:||metal/ceramic interface, crystal plasticity, cohesive model, fracture analysis, Mechanical engineering and machinery, Mechanics of Materials, Materials Science(all), Mechanical Engineering|
|Subjects:||Technology > Mechanical engineering and machinery|
|Department:||Faculty of Engineering > Design, Manufacture and Engineering Management|
|Depositing user:||Pure Administrator|
|Date Deposited:||07 Feb 2012 14:14|
|Last modified:||22 Mar 2017 11:58|