PSI - Issue 80

Haomiao Fang et al. / Procedia Structural Integrity 80 (2026) 53–64 H. Fang et al./ Structural Integrity Procedia 00 (2025) 000 – 000

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Figure 11: (a) A Series 3 environmental test chamber, (b) a 90KN CEAST 9350 Instron Drop Tower impact system and (c) the geometry diagram of M21-T800S composite coupon panel with BVID onside, and its C-scan result [28].

The localization outcomes based on the proposed K-SVD baseline-free methodology are presented in Figure 12, with the actual damage location marked as a white cross. As illustrated in Figure 12 (a-g), the red region becomes more pronounced with the increasing temperature, although it’s still masked by the adjacent artifact. Despite this, the BVID can be accurately localized at all temperatures. Consequently, these localization outcomes validate the robustness of the proposed methodology across varying temperature conditions.

Figure 12: Damage localization outcomes of the BVID under (a) 20 ℃ , (b) 25 ℃ , (c) 30 ℃ , (d) 35 ℃ , (e) 40 ℃ , (f) 45 ℃ , (g) 50 ℃ . 5. Conclusion This study presents a simple, fast K-SVD baseline-free methodology for damage identification on composite coupon panels, purely based on the analytical toneburst excitation. This technique does not rely on any prior baseline nor historical data, which minimizes data collection efforts and significantly lowers computational time. Such approach has a wide application to varying material properties, temperature fields, specimen sizes, sensor configurations, etc. Prior to the implementation of the proposed technique, a calibrated post-processing pipeline for experimental signals