Set cement mechanical properties parameter measurement method and apparatus based on image recognition technology

An apparatus for measuring set cement mechanical properties based on an image recognition technology, wherein the apparatus comprises a detection device, and detection device comprising:

• an experimental section, configured to acquire a first image and a second image of a set cement specimen, the first image being an image of the set cement specimen not subjected to a compressive load in a compressive test, the second image being an image of the set cement specimen subjected to a compressive load during the compressive test;
• a data analysis processing section, configured to:
• extract at least one feature point in the first image;
• perform grayscale scanning on the first image and the second image;
• establish an image grayscale relationship of the same feature point in the first image and the second image;
• acquire the positions of the feature point based on the image grayscale relationship;
• determine a deformation gradient of the feature point by positions of the same feature point in the first image and the second image;
• determine a strain tensor by the deformation gradient;
• and
• determine a Young's modulus parameter and a Poisson's ratio parameter by the strain tensor,
• wherein, the image grayscale relationship is configured as:
• I
• ⁡
• (
• x
• ,
• y
• ,
• t
• )
• =
• I
• ⁡
• (
• x
• +
• u
• ,
• y
• +
• v
• ,
• t
• +
• Δ
• ⁢
• t
• )
• wherein I represents a gray scale, in unit of %;
• x represents an x-axis coordinate of the feature point in the first image, in unit of mm;
• y is a y-axis coordinate of the feature point in the first image, in unit of mm;
• t is the photographing time of the first image, in unit of s;
• u is a variation amount of the x-axis coordinate of the feature point at a certain moment during the compressive test, in unit of mm;
• ν is a variation amount of the y-axis coordinate of the feature point at a certain moment during the compressive test, in unit of mm;
• and Δt is the time difference between the moment at which the second image is acquired and the moment at which the first image is acquired, in unit of s.

An electronic device, comprising:

• one or more processors;
• a storage device, configured to store one or more programs;
• wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to implement a method for measuring set cement mechanical properties based on an image recognition technology, wherein the method comprises:
• acquiring a first image of a set cement specimen taken by a photographing apparatus, the first image being an image of the set cement specimen not subjected to a compressive load in a compressive test;
• extracting at least one feature point in the first image;
• acquiring a second image of the set cement specimen taken by the photographing apparatus, the second image being an image of the set cement specimen subjected to a compressive load during the compressive test;
• performing grayscale scanning on the first image and the second image, establishing an image grayscale relationship of the same feature point in the first image and the second image, acquiring the positions of the feature point based on the image grayscale relationship, and determining a deformation gradient of the feature point by positions of the same feature point in the first image and the second image;
• determining a strain tensor by the deformation gradient;
• and
• determining a Young's modulus parameter and a Poisson's ratio parameter by the strain tensor,
• wherein, the image grayscale relationship is configured as:
• I
• ⁡
• (
• x
• ,
• y
• ,
• t
• )
• =
• I
• ⁡
• (
• x
• +
• u
• ,
• y
• +
• v
• ,
• t
• +
• Δ
• ⁢
• t
• )
• wherein I represents a gray scale, in unit of %;
• x represents an x-axis coordinate of the feature point in the first image, in unit of mm;
• y is a y-axis coordinate of the feature point in the first image, in unit of mm;
• tis the photographing time of the first image, in unit of s;
• u is a variation amount of the x-axis coordinate of the feature point at a certain moment during the compressive test, in unit of mm;
• ν is a variation amount of the y-axis coordinate of the feature point at a certain moment during the compressive test, in unit of mm;
• and Δt is the time difference between the moment at which the second image is acquired and the moment at which the first image is acquired, in unit of s.