Research Article
Ultrasonic Guided Waves-Based Monitoring of Rail Head: Laboratory and Field Tests
Table 1
Laboratory test site layout.
| Location # | Distance (mm) | Description | Head area reduction | Test 1 center head pair | Test 1 gage side pair | Test 2 center head pair | Test 2 gage side pair | Test 3 center head pair | Test 3 gage side pair |
| Rail 1 | 1 | 0 | Joint: start of test zone | | 1–4 | 1–3 | 1–3 | 1–2 | 1–3 | 1 | 2 | 127 | Surface transverse notch | 1% | 5–6 | 4–5 | 4 | 3–4 | 4–5 | 2–4 | | | No defect | | 7–11 | 6–11 | 5–10 | 5–10 | 6–11 | 5–1 | 3 | 920 | Start longitudinal notch | | 12 | 12 | 11 | 11 | 12 | 12 | 4 | 968 | End longitudinal notch | | 15 | 15 | 15 | 14 | 15 | 15 | | | No defect | | 16–17 | 16–18 | 16 | 15–17 | 16–17 | 16–18 | 5 | 1428 | Surface transverse notch | 16% | 18–21 | 19–21 | 17–20 | 18–20 | 18–21 | 19–21 | | | No defect | | 22–24 | 22–25 | 21–24 | 21–24 | 22–25 | 22–25 | 6 | 2060 | Surface transverse notch | 5% | 25–29 | 26–29 | 25–28 | 25–28 | 26–29 | 26–29 | | | No defect | | — | 30 | — | 29 | — | 30 | 7 | 2432 | Joint | | 30–34 | 31–33 | 29–33 | 30–32 | 31–34 | 31–33 |
| Rail 2 | | | No defect | | 35–38 | 34–38 | 34–36 | 33–37 | 35–37 | 34–38 | 8 | 3073 | Internal defect | 8% | 39–41 | 39–41 | 37–41 | 38–40 | 38–41 | 39–41 | | | No defect | | 42–46 | 42–46 | 42–46 | 41–46 | 42–46 | 42–47 | 9 | 3789 | Joint | | 47–50 | 47–50 | 47–49 | 47–49 | 47–50 | 48–50 |
| Rail 3 | | | No defect | | 51–54 | 51–54 | 50–52 | 50–53 | 51–54 | 51–55 | 10 | 4445 | Internal defect | 23% | 55–58 | 55–57 | 53–56 | 54–56 | 55–59 | 56–58 | | | No defect | | 59–61 | 58–61 | 57–59 | 57–59 | 60–61 | 59–62 | 11 | 5013 | Joint | | 62–65 | 62–65 | 60–63 | 60–62 | 62–66 | 63–65 |
| Rail 4 | | | No defect | | 66–69 | 66–70 | 64–66 | 63–67 | 67–68 | 66–68 | 12 | 5657 | Surface oblique notch | 7% | 70–73 | 71–73 | 67–70 | 68–69 | 69–72 | 69–71 | | | No defect | | 74 | 74 | — | 70–71 | — | 72–73 | 13 | 6010 | Surface transverse notch | 20% | 75–78 | 75–78 | 71–74 | 72–74 | 73–77 | 75–77 |
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