FRACTURE ANALYSIS OF PRESSURE VESSEL COMPONENT - ARC SHAPED TENSION SPECIMEN

There are many components of machines, process plants and household goods that fail through over loading improper utilities. Tradition failure criteria cannot adequately explain many structural failures that occur at stress level consider lower than the ultimate strength of the material. Some of failures occur due to deficiency of construction, but many due to material deficiencies in the form of pre-existing flaws that initiated cracks and thus caused fracture. However, no material in reality is flawless and all materials or material produced by fabrication processes contain flaws which constitutes the modes of failure initiation. Essentially, if the crack reach the certain size and is subjected to highly strained region, which are regarded as potential cause of failure. Here it is need to understand the characteristics of crack and its developments. Stress Intensity Factor (K) is used in fracture mechanics to more accurately predict the stress intensity near the tip of a crack caused by a remote load or residual stresses. The testing of material SA 516 Gr 70 and IS 2062 will be carried out with different thickness viz. 12, 16, 18 and 20 mm and critical stress intensity factor of Arc Shaped Tension (AT) specimens were performed which were having crack to width ratio 0.5 as suggested by ASTM E-399.