Correction method for magnetic suspension type soil shear type fracture test
A fracture test and magnetic levitation technology, applied in the direction of applying stable shear force to test the strength of materials, measuring devices, instruments, etc., can solve problems such as large measured values, cracking, and increased fracture toughness of type II fracture, and achieve Improve accuracy, eliminate friction, and apply to a wide range of effects
Active Publication Date: 2020-07-10
HOHAI UNIV
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[0005] When the sample is pushed forward, there is no pressure from the left and right sides, and it is easy to cause the prefabricated crack tip of the sample to crack to both sides, so that the fracture mode develops from type II fracture to type I-II mixed fracture. Applying loads on both sides prevents the crack tip of the sample from cracking to both sides of the crack, and increases the friction force of the crack tip, which causes the fracture toughness KIC of the type II fracture to increase, resulting in a phenomenon that the measured value is too large
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[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.
[0042] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "left side", "right side", "upper", "lower" are based on the orientations or positional relationships shown in the accompanying drawings, and are only For the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, "first", "second" and the like do not represent components importance, and therefore should not be construed as limiting the invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present in...
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The invention discloses a correction method for a magnetic suspension type soil shear type fracture test. The correction method comprises the following steps: step 1, preparation before correction; step 2, sample position correction: the two sets of correction plates synchronously and oppositely moving for the same displacement according to the size of the sample to ensure that the two prefabricated cracks on the sample are located right above the interval gap, and the sample being in contact with the correction plates; step 3, correction before the test: slowly and reversely moving two correcting plates, and keeping the positions unchanged when the two correcting plates are in contact with the left side edge and the right side edge of the soil body test sample and no extrusion force exists, so as to form a correcting pose; step 4, correction in a test: pushing the power plate to advance, applying a horizontal load to the sample, and the correction plate always keeping the correction pose unchanged, so that the conditions that the prefabricated crack cracks from the tip to the two sides and the sample is separated from the crack to the two sides can be prevented, the development trend from II-type fracture to I-II-type mixed fracture is restrained, and pure II-type fracture is realized.
Description
technical field [0001] The invention relates to a soil engineering test method, in particular to a correction method for a magnetic levitation soil shear fracture test. 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. In fracture mechanics, crack propagation can be divided into three basic types according to its stress state, namely: opening type (that is, type I), sliding type (that is, type II) and tearing type (that is, type III ), respectively as figure 1 shown. In soil mass fracture damage, two types of fractures, type I and type II, are mainly involved, and the invention is mainly applicable to the research of pure type II fractures. [0003] The Chinese invention patent with the application number CN201210518436.0, the title of the invention is "Soil shear fracture failure test device and method", including a base, a fr...
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IPC IPC(8): G01N3/00G01N3/24G01N3/02
CPCG01N3/00G01N3/02G01N3/24G01N2203/0025
Inventor 孙一清沈振中甘磊徐力群王润英张宏伟张文兵杨金孟刘杰卿王梓优巫纾予杨子桐俞昊捷
Owner HOHAI UNIV