Abstract
The ductile fracture occurs mainly in three stages i.e. void nucleation, void growth and the voidcoalescence. The present work focuses on the study the coalescence of existing micro void in a ductile material,mild steel. The specimen with holes in square array at various angle to load axis have been tested. The holeswere machined in the specimen and assuming those hole as the voids. The growth and coalescence behavioursduring tensile straining were observed both in macro and micro levels. Since the existing facility is not adequateto make hole size in micron, this work has been carried out by making hole upto 500 micron. The results arecompared with other specimen with bigger size hole and without any hole. Also the effects of micro voids(present in the material) on the progress of crack have been studied. It is found that with same amount of voids,present in different positions, the mechanical properties of the material are altered.
Highlights
Fracture of structural components has been a common phenomenon faced by men for as long as structures have been used
Ductile fracture is always associated with large amount of plastic deformation and it consists mainly of three stages, (i) void nucleation, (ii) void growth and (iii) void coalescence
The following conclusions are drawn from the present experimental study: I
Summary
Fracture of structural components has been a common phenomenon faced by men for as long as structures have been used. Griffith [1] identified that surface energy, i.e. the amount of energy is required for a crack to grow. This theory in the original form is applicable only to a perfectly brittle material such as glass. Later Irwin and Orwan [2] modified this for the ductile material considering the energy required for plastic deformation at the crack tip. Ductile fracture is always associated with large amount of plastic deformation and it consists mainly of three stages, (i) void nucleation, (ii) void growth and (iii) void coalescence. Rice and Tracey [4] found that the micro void undergoes a volumetric growth and shape change due to the continued plastic flow of matrix. Bandstra [5] has done some experiments with simulation and found that growth rate accelerates with the strain rate with the transverse orientations
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