Mixed Mode Fracture Investigation of Rock Specimens Containing Sharp V-Notches

Abstract

This work aims to assess both experimentally and analytically the fracture behavior of rock specimens containing sharp V-notches (SV-notches) subjected to mixed mode I/II loading. To this end, firstly, several mixed mode fracture tests were conducted on Brazilian disk specimens weakened by an SV-notch (SVNBD sample), performed in their corresponding center and with various notch opening angles. Secondly, the fracture resistance of the tested samples was predicted using a criterion named MTS-FEM. This approach is based on the maximum tangential stress (MTS) criterion, in which the tangential stress is determined from the finite element method (FEM). Additionally, in the present research, the required critical distance is calculated directly from finite element analyses performed on cracked samples. Comparing the experimental results and the analytical predictions, it is shown that the fracture curves obtained from the MTS-FEM criterion are in agreement with the experimental results. These results are achieved without the need for the calculation of stress series expansion coefficients, as an additional advantage of the proposed approach.

Data-driven based fracture prediction of notched components

“…So far, a wide range of analytical, numerical and experimental techniques have been developed to predict the failure of notched members subjected to various loading conditions. For instance, extensive studies have been conducted to obtain theoretical solutions for fracture prediction of various types of notches, including sharp V- [11][12][13][14], blunt V- [15,16], U- [17][18][19][20], key-hole [21][22][23][24] and VO-shaped [25,26] notches. As computers have become more powerful, recent research has been more focused on computational methods such as phase-field [27][28][29], extended finite-element [30][31][32][33] and mesh-free [34,35] simulations.…”

Effects of Mode Mixity and Loading Rate on Fracture Behavior of Cracked Thin-Walled 304L Stainless Steel Sheets with Large Non-Linear Plastic Deformation

“…In recent years, numerous studies have investigated the failure behavior of engineering components, considering the presence of notches and cracks [1][2][3][4][5][6][7]. While notches are sometimes intentionally designed in engineering parts [2,4,6,[8][9][10][11][12][13][14][15][16][17], cracks are invariably considered undesirable. Cracks typically form during the manufacturing process or the operational life of a component, diminishing the load-bearing capacity of structures and consequently shortening their lifespan.…”