304 熱的探傷試験データに基づく樹脂構造体内の空洞に対する形状同定シミュレーション(OS4-2 次世代シミュレーション技術の開拓)

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  • 304 Numerical shape identification of cavity in resin structures based on thermal non-destructive testing data

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Thermal non-destructive testing and shape estimation analysis based on the finite element and the adjoint variable methods is carried out to obtain hitherto unknown defect shapes in a structure. In this study, a test piece incorporating a known defect shape was employed to solve the shape estimation problem. We also describe the shape estimation problem of a cavity in a heated resin test piece made using a 3D printer by employing the temperature pattern observed on the surface of the test piece. The surface temperature of a test piece will not be uniformly distributed if it contains cavities. Practical experiments have confirmed that the characteristic of the temperature distribution depends on the size of the cavity. Shape estimation analysis was then carried out. Using numerical analysis, the finite element method was applied to simulate the temperature distribution in the test piece, and the adjoint variable method was employed to estimate the cavity's shape. In the estimation process, the Gaussian filter was employed to smooth the movement of nodes. Using the Gaussian filter, the estimated shape of the cavity was smoother than the result calculated without a smoothing process.

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