Skip to main content

Table 3 Analysis process and results for each echo

From: Application of Nonlinear Lamb Wave Mixing Method for Residual Stress Measurement in Metal Plate

Echo number

1

2

3

4

5

Propagation path

\(d_{1}\)

\(d_{1}\)

\(d_{2}\)

\(d_{2} + d_{2}\)

\(d_{1} + d_{1}\)

Time of arrival(μs)

t1

t2

t3

tsum

t4

t5

48.65

78.08

134.4

126.7

178.8

199.6

Travel time

t1

t2

t3

–

t1–t4

t5–tsum

Mode( MHz)

S0 0.64

A0 0.32

A0 0.64

A0 1.26

S0 1.58

S0 0.64

S0 1.58

Calculating velocity(m/s)

5139

2128

–

3163

–

5071

4664

Theoretical velocity(m/s)

5300

2646

–

3159

–

5300

4406