Abstract
Mixed-mode fracture of construction building materials under impact loading is quite common in civil engineering. The investigation of mixed-mode crack propagation behavior is an essential work for fundamental research and engineering application. A variable angle single cleavage semi-circle (VASCSC) specimen was proposed with which the dynamic fracture test was conducted by using a Split-Hopkinson pressure bar (SHPB). Notably, the mixed-mode crack propagation velocity could be detected by the synchronized crack velocity measuring system. With experimental results, the dynamic initiation stress intensity factors KI and KII were calculated by the experimental-numerical method. Additionally, the crack path of mixed-mode I/II fracture can be predicated precisely by using numerical method. Thus, a comprehensive approach of investigation on mixed-mode I/II fracture under impact loading was illustrated in this paper. The study demonstrates that the mixed-mode I/II crack would transform from complicated mode I/II to pure mode I during crack propagation, and several velocity decelerations induced crack deflection. The dynamic initiation fracture toughness of mixed-mode crack was determined by the experimental-numerical method. The VASCSC specimen has a great potential in investigating mixed-mode fracture problems with the SHPB device.
Highlights
Construction building materials are a significant component of civil engineering, which is shown to be increasingly crucial in dominating the structure strength and project safety
The crack propagation behavior of mixed-mode I/II fracture was experimentally investigated in experiments using the Split-Hopkinson pressure bar
To make a quantitative investigation of mixed-mode I/II crack propagation, the variable angle single cleavage semi-circle (VASCSC) specimen was chosen as the basic configuration, and the pre-crack could be designed with different angles
Summary
Construction building materials are a significant component of civil engineering, which is shown to be increasingly crucial in dominating the structure strength and project safety. The loading rate effect on crack propagation behavior was discussed methods to determine the dynamic crack fracture toughness of mode I cracks were given by Chen [11]. (e) Brazilian disk (BD) under dynamic loads Those specimen configurations were widely applied in the vast fracture toughness measuring and behavior detecting. When it comes to the investigation of mixed-mode crack propagation, especially in a complete process including initiation, propagation, and arrest, a comprehensive investigation method with appropriate specimen remains unknown. Some crucial conclusions in this paper can be potentially applied in civil engineering for design structures and hazard prediction for reference
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