Polished notch modification of SENB-S fracture toughness testing

摘要

In fracture toughness testing it is common for rea- sons of simplicity and reproducibility to use notches to approximate sharp cracks. However, a depen- dence of measured fracture toughness (K_Ic) on notch-root radius is observed. This can be explained as a consequence of the interaction of a distorted stress field with material flaws in front of a notch. A relationship to quantify this effect is presented and Examined. In is shown that to measure true fracture Toughness sharp notches of the size of microstruc- Tural features are required.