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Testing method of I-type crack dynamic fracture toughness under explosive load

A fracture toughness and testing method technology, applied in the field of geotechnical engineering, can solve the problem of lack of rock dynamic fracture characteristics method, and achieve the effect of simple method and convenient operation

Inactive Publication Date: 2015-02-18
SICHUAN UNIV
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Problems solved by technology

[0007] The purpose of the embodiments of the present invention is to provide a method for testing dynamic fracture toughness of type I cracks under explosive loads, aiming to solve the existing technology, Charpy impact test and Hopkinson pressure bar impact Brazilian disc test, lack of research in explosive dynamic loads Problems under the method of dynamic fracture properties of rock

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  • Testing method of I-type crack dynamic fracture toughness under explosive load
  • Testing method of I-type crack dynamic fracture toughness under explosive load
  • Testing method of I-type crack dynamic fracture toughness under explosive load

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specific Embodiment

[0039] In the first step, the present invention adopts such as figure 2 The rectangular plate-shaped sample shown is made of cement mortar, r is the radius of the blast hole, and a detonator is placed in the center of the blast hole. The mix ratio is: cement:sand=1:3; the sample size is: a=100mm, W=200mm, H=120mm, W L =250mm, r=20mm, specimen thickness B=80mm, elastic modulus E=32GPa of cement mortar sample, Poisson’s ratio v=0; 15, density ρ=1900kg / m 3 Tensile strength σ t =3.87MPa;

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Abstract

The invention discloses a testing method of I-type crack dynamic fracture toughness under explosive load. Detonators and a cement mortar sample with a crack are utilized to perform bursting testing research, the dynamic fracture toughness of the sample is determined by an experiment-numerical method, the sample bearing load and the crack initiation time are determined by a strain signal obtained through testing, the obtained time travel curve is input into a finite element program Ansys, the near field displacement of a crack tip is calculated by a 1 / 4 node unit, then the time travel curve of the I-type dynamic fracture stress intensity factor of the sample is obtained by a displacement extrapolation method, and the dynamic fracture toughness of the material is the stress intensity factor at the crack initiation moment, therefore, the new testing method of the I-type crack dynamic fracture toughness under explosive load is given. The method is simple, the operation is convenient, and the testing method has the practical application significance to the research of the dynamic fracture character of the rock under explosive load.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to a method for testing dynamic fracture toughness of type I cracks under explosive load. Background technique [0002] Blasting is a widely used excavation method in geotechnical engineering, so the fracture behavior of rock under blast load is one of the core issues of rock dynamics. [0003] In rock engineering, blasting has always been one of the main rock-breaking means widely used in excavation, mining and tunneling. Therefore, the fracture characteristics and fracture toughness of rocks under explosive dynamic loads are one of the core issues of rock dynamics that people pay attention to, and their research has practical application significance. [0004] The test methods for the static fracture toughness (KIC, JIC) of metal materials are relatively mature. Commonly used test methods include indentation method (IM), three-point bending test (SE), compact ten...

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Application Information

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IPC IPC(8): G01N3/313
Inventor 朱哲明徐文涛肖定军
Owner SICHUAN UNIV
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