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Cohesive-soil strain-control-type I-type fracture toughness tester and testing method

A technology of strain control and fracture toughness, applied in the preparation of test samples, using stable tension/pressure to test the strength of materials, instruments, etc., can solve problems such as fracture, achieve unique structure, convenient cost, and improve test accuracy and stability effects

Inactive Publication Date: 2016-08-17
NANJING UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional three-point bending test for measuring the fracture toughness of metal, concrete and other materials is not suitable for the fracture toughness test of soil, because the fracture toughness of soil is much smaller than that of other materials, and the soil sample is under the action of its own weight. may break

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  • Cohesive-soil strain-control-type I-type fracture toughness tester and testing method
  • Cohesive-soil strain-control-type I-type fracture toughness tester and testing method
  • Cohesive-soil strain-control-type I-type fracture toughness tester and testing method

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Embodiment Construction

[0023] like figure 1 and figure 2 As shown, a strain-controlled type I fracture toughness tester for cohesive soil of the present invention includes a platform for placing samples, a loading force system and a load-displacement measurement system for causing the samples to fracture, and a place for placing samples The platform includes a base 1, a stop bar 2 and a slide rail 3; the loading force system includes a motor 4, a telescopic connecting rod 5, a sensor 6 is connected to the front end of the connecting rod, and a push rod 7 is connected to the front of the sensor; the measuring system includes a sensor 6 and a The digital display 8 displays the thrust borne by the tested sample 9 through the digital display, and the base and the motor are installed on the mounting table. In the present invention, the expansion and contraction rate of the connecting rod can be controlled, and different expansion and contraction rates can be selected within a wide range.

[0024] In t...

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Abstract

The invention discloses a cohesive-soil strain-control-type I-type fracture toughness tester and a testing method. The tester comprises an installing table. A motor is arranged on the installing table, and is connected with a stretchable connecting rod, and a sensor is connected to the front end of the connecting rod, and is connected with a pushing rod; a base is arranged on the installing table, sliding rails are arranged on the base, tested samples are arranged on the sliding rails, a pair of stopping rods are fixedly connected to the base, one faces of the tested samples are connected with the stopping rods, the other faces of the tested samples are connected with the pushing rod, and initial fissures are formed in the tested samples. According to the cohesive-soil strain-control-type I-type fracture toughness tester, as the tested samples lie flatly to be subjected to a fracture test, the gravity influence is eliminated; as the tested samples are put onto the sliding rails, the influence of friction force is eliminated.

Description

technical field [0001] The invention relates to a strain-controlled Type I fracture toughness tester and a test method for cohesive soil, belonging to the field of soil fracture testing in civil engineering and geological engineering. Background technique [0002] Changes in the stress state in the soil can lead to cracking of the soil. After the initial cracks are formed, the cracks will further expand and cause soil damage. Soil fracture toughness is a basic mechanical property index related to the crack propagation of soil, which reflects the ability of soil to resist the unstable expansion of cracks. According to the theory of fracture mechanics, when the stress intensity factor in the soil increases to a certain critical value, the cracks will be unstable and expand, resulting in the fracture and destruction of the soil. The critical or unstable expansion stress intensity factor is the fracture toughness. Because the tensile strength of soil is much lower than that of...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N1/28
CPCG01N1/28G01N3/08G01N2203/0003G01N2203/0019G01N2203/0062G01N2203/0067G01N2203/005
Inventor 张云马维俊李泽华
Owner NANJING UNIV
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