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AssigneeYamaguchi University
InventorsArito SAKAGUCHI, Kouhei ANDO
Estimating the term…
For measuring the stress history in a simple form, which is widely applicable to various types of structural materials which the elastic modulus is different from each other, a large number of calcite particles is embedded as a stress sensor in a cement-based composite material that can be elastically deformed after receiving an external. A twin-crystal density of the calcite particles is measured after an external force is applied to the composite material, to convert the twin-crystal density to a strain by an approximate formula set in terms of a strain ε (%) generated in the composite material and a twin-crystal density Dtw (lines/mm) of the calcite particles, and further to convert this strain to a stress by the elastic modulus of the composite material, whereby to estimate the history of stress and strain. The approximate formula between strain and twin-crystal density is independent of the modulus of the composite material and is used in a common form.
An estimation method of stress and strain history regarding to an object to be measured (50) in which a plurality of calcite particles (11) having a particle diameter of a predetermined size are embedded as a stress sensor,
An estimation method of stress and strain history regarding to an object to be measured (50) in which a plurality of calcite particles (11) having a particle diameter of a predetermined size are embedded as a stress sensor,
A calcite particle aggregates having as a stress sensor, calcite particles (11) with a particle diameter of a predetermined size, mixed and dispersed in a cement composite material (12) serving as a base material prepared in advance so that an elastic modulus becomes a predetermined value in a solidified state to be formed into a predetermined shape of the calcite particle aggregates as a whole;
(canceled)
Dependencies are inferred from the claim text.