Teaching experiment device and method for biology strip-shaped material mechanical property test

Abstract

The invention provides a teaching experiment device for a biology tissue strip-shaped material mechanical property test, which is characterized by comprising loading equipment and a working platform, as well as a power sensor and CCD (Charge Coupled Device) measurement equipment which are both mounted on the working platform; two ends of a test specimen are respectively connected with the power sensor and the loading equipment; and positions of the CCD measurement equipment and the test specimen are matched with each other, so as to measure a deformation of the test specimen. The invention further provides a corresponding method for testing mechanical properties of a biological tissue strip-shaped material. The device and the method, provided by the invention, can achieve determination of a stress-straining curve, a relaxation curve, a creep curve and breakage intensity of the biology tissue strip-shaped material, can obviously demonstrate a principle and a method for testing the mechanical properties of the biology tissue strip-shaped material, and better meet teaching requirements of a medical physics experiment on the test to the mechanical properties of the material.

Description

technical field [0001] The invention relates to the technical field of mechanical property testing. Specifically, the invention relates to a teaching experiment equipment for testing the mechanical properties of biological strip materials and a method for testing the mechanical properties of biological strip materials. Background technique [0002] The mechanical properties of biological tissue materials, such as: hair, silk, spider silk, muscle, blood vessels, etc., are of great significance for the study of the normal and pathological states of organisms. The comprehensive mechanical properties of biomaterials can be obtained through uniaxial tensile testing, such as: stress-strain curve, breaking strength, breaking energy, relaxation curve and creep curve, etc. [0003] In traditional physics experiment teaching, the experiment of measuring the Young's modulus of metal wire by stretching method is a classic experiment for measuring the elastic modulus of metal wire. In t...

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Problems solved by technology

However, the universal testing machine directly takes the displacement of the moving end as the deformation of the specimen, and the stress-strain curve of the specimen can be obtained by using the displacement-load curve given by the test. When performing actual mechanical tests on biological soft tissue materials , it is found that there is a certain error in the stress-strain curve calculated by the above method

In addition, the universal testing machine controls force and displacement through software, and the test results are given directly from the software, which cannot intuitively display the principles and methods of mechanical testing, and it is difficult for students to establish perceptual knowledge from experiments, so it is not suitable for teaching demonstrations

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