Characteristic Evaluation on Bolt Stress by Ultrasonic Nondestructive Methods

Table 1

Austenitic stainless steel bolt (A2-70) axial tensile stress measurement results.

Stress	(μs)	(μs)
0	42.831	76.17	3.145160
20	42.8415	76.204	3.146601	−2.53 × 10^14
40	42.8605	76.2265	3.145552	−1.27 × 10^14
60	42.88	76.247	3.14423	−8.57 × 10^13
80	42.897	76.266	3.143192	−6.47 × 10^13
100	42.9155	76.2835	3.14176	−5.22 × 10^13
120	42.9325	76.3025	3.140722	−4.38 × 10^13
140	42.9515	76.318	3.13902	−3.80 × 10^13
160	42.9685	76.338	3.13808	−3.34 × 10^13
180	42.988	76.357	3.13663	−3.00 × 10^13
200	43.0044	76.3775	3.13583	−2.71 × 10^13
220	43.0245	76.3965	3.13429	−2.49 × 10^13
240	43.042	76.4175	3.13336	−2.30 × 10^13
260	43.062	76.439	3.13207	−2.14 × 10^13
280	43.081	76.462	3.131084202
300	43.1025	76.486	3.129780475
320	43.124	76.512	3.128663993
340	43.148	76.5355	3.127547129
360	43.1755	76.5565	3.12635963

= 5638.499 m s⁻¹.
= 3105.499 m s⁻¹.
λ = 9.8160 × 10¹⁰.
μ = 7.5710 × 10¹⁰.
ρ = 7850 kg m⁻³.
Explanation:
Stress [MPa] bolt axial stress.
[s] time of propagation of longitudinal wave.
[s] time of propagation of shear wave.
  μ the second-order elastic constants of the material.