Using Expert Opinion to Quantify Uncertainty in and Cost of Using Nondestructive Evaluation on Bridges

Table 4

True response stability results from the accuracy subsection from round two through round four.

	Rounds 2 to 3 stability	Rounds 3 to 4 stability
Concrete NDE methods
Electrical potential	−4.93	0.04
Mechanical sounding	−2.83	−1.69
Thermal	−3.23	−0.14
Visual inspection	−11.98	−1.77
Steel NDE methods
Acoustic emission	1.00	−0.41
Liquid penetrant	−4.93	−2.75
Magnetic particle-crack	−1.18	0.10
Magnetic particle-weld	−0.95	−0.03
Radiography	−3.45	−0.42
Ultrasonic-crack	−8.46	1.00
Ultrasonic-pin	−6.58	−0.17
Ultrasonic-weld	0.22	1.00
Visual inspection	−4.15	−5.38

Note. Critical Value = 0.6 (values above critical value are considered stable).