PSI - Issue 57

Matthias Winkler et al. / Procedia Structural Integrity 57 (2024) 510–517 Matthias Winkler / Structural Integrity Procedia 00 (2019) 000 – 000

515

6

= =1,0,95%, [-]

Table 2. Previous results of fatigue tests – Strengthening of pre-damaged components without visible cracks

N treat (load cycles after treatment) [-]

ΣN = N D=1.0,95%,aw + N treat [-]

Δσ [N/mm²]

N D=1.0,95%,aw [-]

Δσ C,95% [N/mm²]

Treatment

Nr.

Detail

1 2 3 1 2 3 4 5 1 2 3 1 2 3 1 2 3 4 5 6

180 180 100 140 140 140 100 200 200 150 250 230 250 200 200 117 200 200 117 90

86,159 86,159 502,479 183,119 183,119 183,119 502,479 689,272 98,056 98,056 232,429 50,205 64,473 50,205 24,974 24,974 124,746 24,974 24,974 124,746

144,921 277,852 891,560

231,080 364,011

2.68 4.22 2.77 2.51 9.46 10.8 12.0 7.09 13.5 52.0 22.5 14.1 78.6 17.0 5.29 4.60 15.6 20.9 17.4 24.4

Disc grinding

1,394,039

459,475

276,356

Rail clamp

63.1

1,733,173 1,970,662 6,005,675 4,886,954 1,320,970 5,098,056 5,232,429

1,550,054 1,787,543 5,503,196 4,197,682 1,222,914 5,000,000 5,000,000

HFMI

Burr grinding

Transverse stiffener

73.2

706,730

656,525

HFMI

5,064,473

5,000,000

853,179 132,199 114,929

802,974 107,225 89,955

1,945,285

1,820,539

Lateral attachement

46.4

HFMI

521,887 433,678

496,913 408,704

3,049,882

2,925,136

Table 3. Mean values of processing speed and D treat Process Processing speed [cm/min] D treat [-] Disc grinding 9.8 3.2 Burr grinding 3.5 29.3 HFMI 22.5 17.1

c

b

a

Figure 8. S-N-curves of investigated structural details – a) rail clamp, b) transverse stiffener, c) lateral attachment – pre-damaged and treated