A shearing device for measuring the mechanical properties of biological soft tissue

Abstract

The invention belongs to a shearing device for measuring mechanical properties of biological soft tissues. A base and a Z-axis automatic sliding table are arranged on a machine frame base plate of the device, a Z-axis driving plate is arranged on one side of the Z-axis automatic sliding table, a Z-axis sensor is arranged above the Z-axis driving plate, a carrying container is arranged on the Z-axis sensor, an X-axis automatic sliding table, a Y-axis automatic sliding table, an X-axis automatic driving guide rail and a Y-axis automatic driving guide rail are arranged on a machine frame upper plate, an X-axis driving plate and a Y-axis driving plate are arranged on the X-axis automatic sliding table and the Y-axis automatic sliding table, an X-axis sliding block, a Y-axis sliding block, an X-axis connecting plate and a Y-axis connecting plate are arranged above the X-axis automatic driving guide rail and the Y-axis automatic driving guide rail, an X-axis sensor and a Y-axis sensor are arranged between the X-axis driving plate and the Y-axis driving plate and the X-axis connecting plate and the Y-axis connecting plate, and a Y-axis driven guide rail, an X-axis driven guide rail, the X-axis sliding block and the Y-axis sliding block are arranged between the X-axis connecting plate and the Y-axis connecting plate and an upper shearing platform. The sensors, the connecting plates and the upper shearing platform are driven by the automatic sliding tables to cause deformation of a sample. Double-axial shearing is achieved by combining the upper shearing platform, side face guide rails and the sliding tables. The shearing device has the advantages of being simple in structure, good in stability, high in sensitivity, accurate in measurement and convenient to operate and carry.

Description

technical field [0001] The invention belongs to the technical field of biomechanics, in particular to a shearing device for measuring the mechanical properties of biological soft tissues. Background technique [0002] At present, most of the mechanical properties measurements of biological soft tissues still stay in the stage of axial tension experiment, such as uniaxial tension and biaxial tension. As an experimental method to explore the mechanical properties of biological soft tissues, axial stretching can reflect the mechanical properties of biological soft tissues to a certain extent. The data obtained from the tensile test cannot fully reflect its complex anisotropic mechanical properties. In order to obtain the mechanical properties of biological soft tissue more comprehensively, we need to adopt another experimental method, that is, shear experiment. Simply put, the shear experiment uses a cubic experimental sample, and pastes it on two parallel platforms up and do...

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Problems solved by technology

Because the deformation loading is on the lower platform and the force measurement is on the upper platform, the subsystem will inevitably need to generate some displacement to measure the shear force, so the actual shear deformation needs to be corrected, which will bring inconvenience to the data processing , and when the data is corrected, the correction error will have a certain impact on the accuracy of the data. At the same time, the subsystem also has unfavorable factors such as high processing accuracy requirements and difficult assembly; in addition, when the lower platform moves laterally, it will cause the lower platform. The oscillation of the physiological solution in the upper loading container increases the interference in the measurement and affects the measurement of the sample; finally, in the Z-axis direction, the manual rotation knob is used to lift and lower the platform, which brings inconvenience to the operation in the Z-axis direction

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