Crack Inspection Using Load–Opening Analysis for Natural Growth Inhibition
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Solution Overview
Problem
Conventional techniques struggle to evaluate crack growth inhibition effects when growth is inhibited by natural phenomena such as corrosion products or fretting oxides, as they require thermoelastic temperature variations before and after inhibition, which are not measurable in these cases.
Innovation Solution
A crack inspection apparatus that includes a structure data acquisition unit, crack information acquisition unit, loaded crack information unit, and an estimation unit to quantify the growth inhibition effect by measuring crack opening and load relationships, using fracture mechanics parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermoelastic temperature variations are measured before and after repair to evaluate crack growth inhibition effect, then the evaluation can be performed for repaired cracks, but it becomes impossible to evaluate cracks inhibited by natural phenomena where pre-inhibition data cannot be obtained
Solution Approach 1:
The invention changes the evaluation parameter from comparing temperature variations before and after repair to measuring the relationship between applied load and crack opening displacement. This parameter change enables evaluation of natural inhibition cases where pre-inhibition data is unavailable, while maintaining reliability through the direct measurement of crack behavior under load
2Measurement precision
If conventional thermoelastic measurement method is used, then evaluation can be performed with existing repair data, but the method requires complex temperature measurement procedures and cannot handle natural inhibition cases
Solution Approach 1:
The invention replaces the thermoelastic temperature measurement system with a mechanical measurement system that directly measures crack opening displacement under applied load. This substitution simplifies the measurement system by eliminating temperature sensors and thermal field equipment, while maintaining or improving measurement precision through direct mechanical measurement of crack behavior
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy evaluation of crack growth inhibition effects even when growth is naturally inhibited, allowing for accurate assessment without requiring thermoelastic temperature variations.
Implementation Method 1
an estimation unit to estimate a fracture mechanics parameter from a relationship between the load applied to the crack and the amount of opening
Data Source
AI summary
A crack inspection apparatus includes an input unit that is a structure data acquisition unit that acquires structure data indicating characteristics of a structure that is to be inspected, a geometry measuring unit that is a crack information acquisition unit that acquires crack information indicating the geometry of a crack that has occurred in the structure, an opening amount measuring unit that is a loaded crack information acquisition unit that acquires loaded crack information indicating the amount of opening of the crack with a load applied to the crack, and an estimation unit that estimates a fracture mechanics parameter from the relationship between the load applied to the crack and the amount of opening, based on the structure data, the crack information, and the loaded crack information, the fracture mechanics parameter quantitatively indicating a growth inhibition effect on the crack.