Tangential strain‐based criteria for mixed‐mode I/II fracture toughness of cement concrete

Abstract

Experimental and theoretical works are performed on the mixed-mode I/II brittle fracture of cement concrete tested by edge cracked semicircular bend specimens. Theoretical background of the traditional fracture criteria including strain energy density, maximum tangential stress, and maximum tangential strain (MTSN) are introduced. The ability of each fracture criterion in prediction of the fracture test data is investigated. The comparison between the evaluations by the traditional criteria and the experimental data shows that none of them are capable of successfully estimating the fracture resistance of cement concrete. An enhanced version of the MTSN criterion is then employed to predict the test data. It is demonstrated that the extended MTSN criterion can successfully predict the test data in a higher accuracy than traditional criteria.

A comparative study on stress intensity factor-based criteria for the prediction of mixed mode I-II crack propagation in concrete

“…According to the maximum tangential stress criteria, a multi-parameter fracture criterion was proposed for concrete to estimate its crack propagation direction under the mixed mode I-II fracture. Meanwhile, some strain-based criteria [6][7][8] were proposed to determine the crack propagation of the mixed mode I-II fracture of concrete based on the maximum tangential strain criterion. Similar to the maximum tangential stress criterion, the crack propagates in the direction where the tangential strain reaches its maximum value.…”

A refined diffuse cohesive approach for the failure analysis in quasibrittle materials—part II: Application to plain and reinforced concrete structures

“…A further validation of the DIM in plain concrete is performed by considering the more general case of mixed‐mode fracture conditions, usually associated with crack paths unknown a priori . To this end, the famous mixed‐mode test introduced by Gálvez et al is considered, involving a small‐sized prenotched concrete beam subjected to unsymmetrical three‐point bending.…”

Modelling of crack propagation in rocks under SHPB impacts using a damage method

“…In order to investigate the effects of the interface and sample size (ie, diameter of the bar in SHPB experiment), a half sine stress wave had been studied, and it can effectively reduce wave dispersion . At the same time, many specimens' types had been developed to research rock fracture . However, the experiments are still faced with many problems, such as the accuracy in measuring loads and the control of the boundaries .…”

“…5 At the same time, many specimens' types had been developed to research rock fracture. [7][8][9][10][11][12][13][14][15][16][17] However, the experiments are still faced with many problems, such as the accuracy in measuring loads and the control of the boundaries. 18 In fact, neither the amplitude of the stress wave nor the nature of the materials can be exclusively responsible for rock fracturing, 19 and it is combination of several factors that control the fracture propagation process.…”