Rock inhomogeneous mechanical parameter inversion method based on DSCM-FEMU

Abstract

The invention relates to a rock inhomogeneous mechanical parameter inversion method based on DSCM-FEMU. The method comprises the steps of observing the deformation of the test piece in the rock loading experiment process based on a digital speckle correlation method, and calculating a strain field; based on a finite element model correction method, establishing a numerical calculation model for experimental loading in the ABAQUS, giving initial elastic parameters of each unit, assigning the elastic parameters of each unit by using a Python program based on weibull distribution, performing finite element calculation, and automatically outputting a stress field of the numerical model through the Python program; based on the finite element theory, deducing a rock inhomogeneous mechanical parameter inversion objective function, representing the difference between an experimental measurement strain field and a numerical calculation strain field, using an optimization algorithm to minimize the objective function, outputting most matched elastic parameters of each unit, and if the objective function does not meet an iteration convergence condition, automatically modifying the elastic parameters of each unit through a Python program, substituting the elastic parameters into a new round of finite element calculation until the objective function converges, and outputting the elastic parameters of each unit.

Description

technical field [0001] The invention relates to a rock inhomogeneous mechanical parameter inversion method based on DSCM-FEMU, and belongs to the technical fields of photomechanics, deformation measurement and numerical simulation. Background technique [0002] The Digital Speckle Correlation Method (Digital Speckle Correlation Method, DSCM) is a non-contact optical measurement method, which is based on the "gray level invariance assumption", and uses a correlation algorithm to track the position changes of random speckle points during the deformation process. field and high precision. In recent years, the digital speckle correlation method has been widely used in experimental research in many fields of geotechnical engineering. For example, in the experimental loading process of rock materials, the displacement field and strain field, but this method cannot calculate and measure the stress field and material parameters of the material, and this problem needs to be further ...

AI Technical Summary

Problems solved by technology

In recent years, the digital speckle correlation method has been widely used in experimental research in many fields of geotechnical engineering. For example, in the experimental loading process of rock materials, the displacement field and strain field, but this method cannot calculate and measure the stress field and material parameters of the material, this issue needs to be further studied

Images