Ductile Failure Prediction of U-Notched Bainitic Functionally Graded Steel Specimens Using the Equivalent Material Concept Combined with the Averaged Strain Energy Density Criterion

Abstract

In this paper, the ductile fracture of bainitic Functionally Graded Steel (FGS) has been studied. Fracture tests was performed on U-notched specimens made of bainitic FGS under mode I. The averaged Strain Energy Density (SED) criterion combined with Equivalent Material Concept (EMC) was employed to predict the ductile fracture of bainitic FGS. For this purpose, first based on EMC, the mechanical properties of a virtual brittle FGS was obtained. Then the averaged value of SED over a well-defined control volume was calculated by finite element analysis for U-notched virtual brittle FGS. After that, the fracture loads was obtained based on the averaged SED criterion. The agreement between experimental fracture loads and theoretical predictions was good.

A new strategy for predicting fracture of U‐notched specimens made of Al‐6061‐T6 and Al‐5083 using extended finite element method

“…For instance, Torabi and Alaei 16,17 predicted the notch strength of blunt V‐notched Al‐7075‐T6 specimens using EMC with the aid of mean stress (MS) and point stress (PS) models. There are more studies in simplifying fracture analysis of nonlinear materials, such as ductile, polymers, and composite materials, that one can refer to 18–21 …”

“…There are more studies in simplifying fracture analysis of nonlinear materials, such as ductile, polymers, and composite materials, that one can refer to. [18][19][20][21] The previous mentioned works are all complex and requires calibration or cannot provide a prediction about crack growth path which is one of the crucial subjects in fracture and damage mechanics. In fact, many catastrophic failures can be prevented or postponed by considering suitable remedies for structural problems and crack growth.…”

Prevalent Mode II Fracture Investigation of VO-Notched Specimens Made of Tungsten–Copper Functionally Graded Materials

“…The plates fabricated from austentic-martensitic FGS weakened by Unotch were investigated by Barati et al [19]. Salavati and Mohammadi [20] investigated the ductile fracture of bainitic FGS and performed fracture tests on U-notched specimens under mode I loading. They employed the strain energy density with equivalent material concept to predict the ductile fracture of bainitic FGS.…”