AE法による繊維強化金属(FRM)の破壊機構の解明と疲労損傷評価 : 第1報,カオス解析とマハラノビス距離による破壊形態の把握

概要

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FRM improving the shortcomings of FRP is widely used as the structural member under the hard environments. However, a fatigue which occupies much of the fracture accidents of the structures cannot be avoided and the growth mechanism of the fatigue damage is very complicated. Because these two things are the serious problem, the establishment of the technique which evaluates the damage and its mechanism is desired. Our aim is to establish the evaluation method for the damage and the fracture mechanism of the fatigue. In this paper, the method that evaluates the fracture types with the chaos analysis and the mahalanobis distance is presented. As the results, the following things became clear : (1) the feature spaces of the matrix damage by the shear mode crack and the fiber breaking are represented by the correlation dimensions and the largest lyapunov exponents of the AE waveforms ; (2) the feature spaces of the matrix damage by the tensile mode crack, the fiber deboniding and the fiber pullout are represented by the correlation dimensions and the largest lyapunov exponents of the time fluctuation waveforms of the wavelet coefficient; (3 ) it became clear that the recognition of each fracture type is evaluated by the mahalanobis distance for each feature space.
社団法人日本機械学会の論文
2007-04-25