Soft matter mechanical property measurement method and system

Abstract

The invention discloses a soft matter mechanical property measurement method and system. The measurement system comprises a piezoelectric bimorph beam, an electric hoisting platform, an impedance analyzer, a strain gauge and a computer control system. The measurement of a characterization method of a plurality of types of mechanical properties can be finished through one-time loading, and different mechanical properties of a sample to be detected are obtained, so that the testing accuracy and the testing efficiency can be improved; a change rule that the mechanical properties of the sample to be detected can be changed along pressing depth can be obtained, and influences on a measurement result, caused by factors including the end part abrasion of a pressed needle tip and the surface effect of the sample to be detected and the like are eliminated, so that a relatively accurate result is provided; a beam type loading system is adopted, is a flexible loading system and is applicable to measurement of soft matters; and the piezoelectric bimorph beam is used for amplifying a pressing signal by utilizing bending deformation in a pressing process, so that the sensitivity of a testing process is relatively high when amplification is carried out.

Description

Technical field [0001] The invention belongs to the field of detection and measurement, and specifically relates to a method for measuring the mechanical properties of soft materials and a measurement system thereof. Background technique [0002] Soft matter is a kind of matter closely related to human beings. Common soft matter includes biological tissues, bioengineered materials and high polymer products in life. Research on the characterization methods of the mechanical properties of soft materials will help solve the difficult problems of the preparation and application of soft materials, and help solve human disease problems, develop tissue engineering and improve human living standards. [0003] The commonly used methods for characterizing the mechanical properties of soft substances include universal testing machine-based methods, press-in methods and straw methods. Based on the universal testing machine method, tensile or compression tests are performed by making standard-...

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Problems solved by technology

The method based on the universal testing machine is used to perform tensile or compression tests by making standard-shaped specimens. This method can only test homogeneous materials and will cause damage to the original system of the material.

The indentation method uses a fixed-shaped indentation tip to continuously press into the sample, and the load-displacement data obtained by fitting the contact model can invert the mechanical parameters of the material. This method does not damage the sample, but its disadvantage is that it is difficult to The dynamic viscoelastic properties of materials are measured

The straw method uses a hollow straw to apply negative pressure on the surface of the material to suck up the sample, and establishes the relationship between the suction height and the suction pressure to invert the mechanical information of the sample. This method has a large geometric nonlinear problem, so will affect the measurement accuracy

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