Indentation experimental device and indentation experimental method based on measurement of load and deformation field

Abstract

The invention discloses an indentation experimental device and an indentation experimental method based on the measurement of load and a deformation field. The device comprises a load detection module, a deformation field detection module and a post-processing system, wherein the load detection module is used for detecting load information applied to a test material by indentation; the deformationfield detection module is used for detecting deformation field information of the test material when the indentation is applied to the test material; the post-processing system is used for acquiringmechanical parameters of the test material according to the deformation field information and the load information, thus obtaining an analysis result of an indentation experiment. The device has the advantages that effective information amount obtained by the indentation experiment can be improved, further the application range of an indentation method can be expanded and the measurement accuracyis improved.

Description

Technical field [0001] The invention relates to the technical field of indentation experiments, in particular to an indentation experiment device and method based on load and deformation field measurement. Background technique [0002] The indentation method is a method of inverting the mechanical properties of the material by extracting the load-displacement curve of the hard object pressed into the material and analyzing it, such as figure 1 Shown. The indentation method has many advantages such as simple and convenient operation, easy design and realization of the instrument. Since this method was proposed, it has received extensive attention from mechanics researchers. In the literature, indentation methods for different material mechanical properties (such as elasticity, viscoelasticity, elastoplasticity) have been developed, and the method has been extended to micro-nano scales. Material characterization field. Many of the research results have been successfully transform...

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Problems solved by technology

However, in some application scenarios, this requirement is difficult to meet (such as characterizing human tissue)

Because the load-displacement curve contains relatively little information and the error tolerance rate is very low, this kind of inverse method often has a large condition number, and the relative error of the inversion result in actual use is large, which needs to be solved urgently

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