PSI - Issue 65

Kuskov K.V. et al. / Procedia Structural Integrity 65 (2024) 133–138 Kuskov K.V./ Structural Integrity Procedia 00 (2024) 000–000

136

4

Table 4. Accelerated test results for steel 45

Cycle numbers, unit.

Stage Stress, МPа

Sample 1 Series 1

Sample 2 Series 1

Sample 3 Series 1

Sample 1 Series 2

Sample 2 Series 2

Sample 3 Series 2

125.4 167.1 208.9 250.7 292.5 334.3

72000 72000 72000 72000 72000 30000

72000 72000 72000 72000 72000 22470

72000 72000 72000 72000 72000 18000

72000 72000 72000 72000 72000 55800

72000 72000 72000 72000 72000 39000

72000 72000 72000 72000 72000 20900

Table 5. Accelerated test results for steel 40Kh

Cycle numbers, unit.

Stage Stress, МPа

Sample 1 Series 1

Sample 2 Series 1

Sample 3 Series 1

Sample 1 Series 2

Sample 2 Series 2

Sample 3 Series 2

167.2 222.9 278.7 334.4 390.2 445.9

72000 72000 72000 72000 42350 36000

72000 72000 72000 72000 33920 31800

72000 72000 72000 72000 54600 24000

72000 72000 72000 72000 72000 37270

72000 72000 72000 72000 72000 50400

72000 72000 72000 72000 71690 32600

Fig. 2. A diagram of the step loading program for the sample 1 of series 2 for the 30KhGSA steel in semi-log coordinates: 1 – the curve corresponding to � �� � ; 2 – the curve corresponding to � �� ; 3 – the curve corresponding to � �� � . Table 6. Data processing by the Locati method for the sample 1 of series 2 for the 30KhGSA steel. №

Conditional curve � �� � Cycle numbers N

Conditional curve � �� Cycle numbers N

Conditional curve � �� � Cycle numbers N

σ on the stage, МPа

Cycle numbers, (n) unit.

n/N

n/N

n/N

251.5 72*10 3 335.4 72*10 3 419.2 72*10 3 503.0 72*10 3 586.9 72*10 3 670.7 6.63*10 3

> 1*10 11 > 5*10 9 > 1*10 8 4640000 135600

> 1*10 11 > 5*10 9 > 1*10 8 7420000 216300

> 1*10 11 > 5*10 9 > 1*10 8 11810000

1. 2. 3. 4. 5. 6. 7.

- - -

- - -

- - -

0.02 0.53 1.67

0.01 0.33 1.04

0.01 0.21 0.65

345100 10130

3981

6350

Σ(n i /N i )

2.21

1.39

0.87