Study on Fatigue Test and Life Prediction of Polyurethane Cement Composite (PUC) under High or Low Temperature Conditions

Table 7

Bending fatigue equation of polyurethane cement.

No.	Temperature level	Fatigue equation	Correlation coefficient R
1	−50°C	ε = −647.0500lgN + 425.9884	0.9755
2	−40°C	ε = −751.4400lgN + 4719.6769	0.9682
3	−30°C	ε = −813.9321lgN + 5189.1863	0.9857
4	−20°C	ε = −925.3924lgN + 5967.3441	0.9812
5	−10°C	ε = −942.8634lgN + 6272.2971	0.9892
6	0°C	ε = −1207.4277lgN + 8005.2405	0.9858
7	10°C	ε = −1932.3256lgN + 12644.8200	0.9651
8	20°C	ε = −2182.3339lgN + 14272.7852	0.9054
9	30°C	ε = −2651.0370lgN + 17256.0256	0.9697
10	40°C	ε = −2974.7764lgN + 19357.8834	0.9397
11	50°C	ε = −4149.7268lgN + 26850.2381	0.9471