Testing device and method of soil body II-type fracture damage

Abstract

The invention discloses a testing device of soil body II-type fracture damage. A front stop iron and a thrust providing device are respectively connected to two ends of a base, and the front stop iron or the thrust providing device is in sliding connection with the base; the power output part of the thrust providing device is connected with one end of a load sensor, and the other end of the load sensor is connected with a thrust plate; the signal output ends of the load sensor and a displacement sensor are both connected to a computer; the load sensor detects a load applied to a test sample; and the displacement sensor detects the deformation of the test sample in a test. The invention has the beneficial effects that the loading state of the test sample in the whole testing process is kept as a pure II-type, and the damage to the test sample is II-type fracture damage, thereby ensuring that the test data is accurate and credible, and facilitating the later mechanical analysis.

Description

technical field [0001] The invention relates to a fracture mechanics test device and method, in particular to a test device and method for soil type II fracture failure. Background technique [0002] Fracture is a failure process caused by the initiation of new cracks or the expansion of existing cracks, and is one of the failure modes of materials and structures. Over the past four decades, the development of fracture mechanics for brittle and quasi-brittle materials has mainly focused on concrete and, at the same time, has established its rightful place in geotechnical engineering. Applications of Fracture Mechanics It has been shown that fracture mechanics can provide a powerful tool for investigating and solving many application problems in geomechanics and geotechnical engineering. [0003] In fracture mechanics, cracks can be divided into three basic types according to the stress state ( figure 1 ), namely open type (I type), slide open type (II type) and tear open t...

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Problems solved by technology

In fact, it is very difficult to do this, or it is almost impossible to do it completely.

First of all, it is very difficult to adjust the distance between the two loading points and the two support points precisely before loading the test; what is more difficult is that during the test, due to the deformation of the sample, the bending force acting on the plane where the prefabricated crack in the sample is located is very difficult. moments cannot always be zero

Once the bending moment acting on the plane where the prefabricated crack in the sample is located is not zero, the loading state of the sample is not a pure type II, but a composite type I-II, and the damage of the sample cannot be regarded as a type II fracture failure. , but I-II composite fracture damage, which makes the later analysis work without a reliable basis, resulting in increased errors

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