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Abstract
To reveal the effect of stress triaxiality on plastic damage evolution and failure mode, 316L notched specimens with different notch sizes are systematically investigated by digital image correlation (DIC) observation, plastic damage analysis by finite element simulation, and void mesoscopic observation. It was found that the plastic damage evolution and failure mode are closely related with notch radius and stress triaxiality. The greater the stress triaxiality at the root is, the greater the damage value at the root is and the earlier the fracture occurs. Moreover, void distribution by mesoscopic observation agrees well with damage distribution observed by finite element simulation with the Gurson-Tvergaard-Needleman (GTN) damage model. It is worth noting that, with the increase in stress triaxiality, the failure mode of notched specimen changes from ductility fracture with void coalescence at the center position to crack initiation at the notch root, from both mesoscopic observation and damage simulation.
Highlights
The stress constraint caused by initial defect, dimensional unevenness, welding process, etc.influences the damage process of mechanical structure
The purpose of this paper is to reveal the effect of stress triaxiality on the plastic damage evolution and failure mode of notched specimen for 316L austenitic stainless steel
The stress triaxiality at the center of net section can be calculated a by the formula η = 31 + ln 1 + 2R00, which was proposed by Bridgman [45], where a0 is the round radius of the net section and R0 is the notch radius
Summary
The stress constraint caused by initial defect, dimensional unevenness, welding process, etc. Influences the damage process of mechanical structure. Stress triaxiality is a quantitative parameter to evaluate the stress constraint, which is an important factor to the plastic damage evolution and failure mode [1,2]. As discussed by Ma et al [4], stress triaxiality and the Lode parameter greatly affected the development of void volume fraction. Wen et al [5] found that the failure strain was closely related with stress triaxiality, and the effect of Lode parameter was significant at low stress triaxiality. Chandan et al [6] discussed the effects of notch types containing
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