Method and apparatus for determination of mechanical properties of functionally-graded materials
AssigneeMassachusetts Institute of Technology
InventorsAntonios E. Giannakopoulos, Subra Suresh
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Abstract
Techniques for the determination of mechanical properties of homogenous or functionally-graded materials from indentation testing are presented. The technique is applicable to indentation on the nano-scale through the macro-scale including the geological scale. The technique involves creating a predictive load/depth relationship for a sample, providing an experimental load/depth relationship, comparing the experimental data to the predictive data, and determining a physical characteristic from the comparison.
Claims27
A process for generating digital information indicative of a measure of variation of a mechanical property of a material, comprising:
- receiving signals indicative of a load/depth relationship from an indentation test for at least two depths of an indenter applied to the material;
- receiving signals indicative of the geometry and properties of the indenter and a Poisson ratio of the material;
- and
- computing the variation in the mechanical property as a function of the load/depth relationship, the geometry of the indenter, and the Poisson ratio.
A process for measuring a mechanical property of a functionally-graded material, comprising:
- receiving signals indicative of a load/depth relationship of an indentation test for at least two depths of an indenter applied to the material;
- receiving signals indicative of the geometry and properties of the indenter and a Poisson ratio of the material;
- and
- computing the mechanical property as a function of the load/depth relationship, the geometry of the indenter, and the Poisson ratio.
A process for detecting a deviation from a variation in a mechanical property of a material as a function of depth, comprising:
- receiving signals indicative of a load/depth relationship of an indentation test for a depth of an indenter applied to the material;
- receiving signals indicative of the geometry of the indenter and a Poisson ratio of the material;
- computing a load/depth relationship according to the geometry and properties of the indenter, the Poisson ratio, and the variation in the mechanical property and a reference mechanical property;
- and
- comparing the computed load/depth relationship to the received signal to detect the deviation.
A method comprising:
- performing an indentation test on a sample with an indenter in a direction essentially parallel to a direction of gradation of a functionally-graded material and deriving and recording a relationship between the load applied to the indenter and the depth of penetration of the indenter into the sample.
A computer system for generating digital information indicative of a measure of variation of a mechanical property of a material, comprising:
- means for receiving signals indicative of a load/depth relationship from an indentation test for at least two depths of an indenter applied to the material;
- means for receiving signals indicative of the geometry and properties of the indenter and a Poisson ratio of the material;
- and
- means for computing the variation in the mechanical property as a function of the load/depth relationship, the geometry of the indenter, and the Poisson ratio.
A computer system for measuring a mechanical property of a functionally-graded material, comprising:
- means for receiving signals indicative of a load/depth relationship of an indentation test for at least two depths of an indenter applied to the material;
- means for receiving signals indicative of the geometry and properties of the indenter and a Poisson ratio of the material;
- and
- means for computing the mechanical property as a function of the load/depth relationship, the geometry of the indenter, and the Poisson ratio.
A computer system for detecting a deviation from a variation in a mechanical property of a material as a function of depth, comprising:
- means for receiving signals indicative of a load/depth relationship of an indentation test for a depth of an indenter applied to the material;
- means for receiving signals indicative of the geometry of the indenter and a Poisson ratio of the material;
- means for computing a load/depth relationship according to the geometry and properties of the indenter, the Poisson ratio, and the variation in the mechanical property and a reference mechanical property;
- and
- means for comparing the computed load/depth relationship to the received signal to detect the deviation.
Dependencies are inferred from the claim text.