FRACTURE, FATIGUE AND FAILURE ANALYSIS ON ELONGATION IN ANOCRYSTALLINE MATERIAL DEFORMED BY ARB PROCESS

Imposing strain during ARB process by forcing external and internal grain sizes of conventional material dimensions to nanometer scale by top down that gives rise to enhanced materials. This impacts the resistance and ductility due to material cracking which negatively impact on material properties such as elongation to failure from useful elongation that usually enhanced mechanical properties. Several parameters characterized fracture, fatigue and failure to elongation during ARB process. Recent studies also revealed some information on the scientific origins of lack of ductility in a material, resistance due to fracture and the main factors govern fatigue resistance in a material during property enhancement. In the current study, the strain model was optimized during material fatigue by ARB process. Different facture, fatigue and failure mode analysis was revealed due to ARB process and their impact on material properties was revealed. Their different intrinsic mechanisms being used to enhance material hardening and material strain rate sensitivity during production so as to delay necking and improve grain-boundary cohesion which resist intergranular cracks or voids in a material are revealed. It was shown that, the extrinsic manufacturing methods are utilized by hybridizing the produced material with another material to delocalize material deformation process and that is commonly used in stretchable electronics. It was also revealed that the initiation in material fatigue crack being enhanced by a fine structure, but at the expense of greater crack fatigue growth rates during material deformation process. The extrinsic toughening through hybridization process during material deformation allows arresting or bridging cracks during ARB process.