Characteristic Evaluation on Bolt Stress by Ultrasonic Nondestructive Methods

Table 3

Axial tensile stress measurement results for a low-carbon 8.8 steel bolt.

Stress	(μs)	(μs)
0	46.402	84.484	3.28979
20	46.412	84.4885	3.2886	−4.99 × 10^14
40	46.427	84.495	3.286792	−2.51 × 10^14
60	46.4405	84.505	3.285529	−1.69 × 10^14
80	46.456	84.514	3.283863	−1.27 × 10^14
100	46.47	84.524	3.282523	−1.02 × 10^14
120	46.487	84.533	3.280624	−8.59 × 10^13
140	46.5025	84.543	3.27905	−7.41 × 10^13
160	46.519	84.552	3.277234	−6.53 × 10^13
180	46.5335	84.562	3.275821	−5.84 × 10^13
200	46.549	84.572	3.274252	−5.29 × 10^13
220	46.57	84.582	3.27182	−4.85 × 10^13
240	46.5825	84.59	3.270553	−4.47 × 10^13
260	46.6	84.6	3.268675	−4.16 × 10^13

= 5958.466 m s⁻¹.
= 3170.589 m s⁻¹.
λ = 12.087 × 10¹⁰.
μ = 7.8910 × 10¹⁰.