A numerical study of the elastic stress field arising from sharp and blunt V-notches in a SENT-specimen

摘要

The elastic stress field arising from a V-notch in a Single Edge Notched Tension (SENT) specimen is studied using the Sherman-Lauricella integral equation. Accurate values of the generalized stress intensity factor, here denoted Qt are determined and compared with values from the literature. A Q_I-dominated distance ahead of the notch tip is defined and determined for several notch angles and different notch depth to specimen width ratios. It is found that for depth to width ratios over 0.45 the Q_I-dominated distance is approximately constant while below this value the distance can show a great variation with the notch angle. Additionally. a general formula for the maximum stress in a V-notch with a finite root radius is derived. Its applicability on the SENT-specimen is studied and presented as a family of curves. If used within these curves, the formula can accurately predict stress concentrations, even for very smooth notches.