PSI - Issue 83

Amir Hossein Mirzaei et al. / Procedia Structural Integrity 83 (2026) 239–245

242

3.2. Fatigue tests Compression-compression fatigue tests were performed at a load ratio of 0.1 for all relative densities in both SL and S-N tests. The studied specimens are shown in Fig. 2a, and Fig. 2b illustrates the S-N curves for the lattices reported by Foti et al. (2025). Table 1 presents the experimental SL results from the current study.

(a) (b) Fig. 2. a) representation of the studied specimens, b) reported S-N curve for gyroids with relative density of 12.5%, 25%, 37.5%, and 50% (Foti et al., 2025).

Table 1. Experimental results of the performed step-load tests.

Case No. RD (%)

σ 0 (MPa) Δσ (MPa)

Repeat

σ f (MPa)

N b

N f

N total

1 2 3 1 2 3 1 2 3 1 2 3

5.43 294,514 3,294,514 4.92 231,992 2,231,992 5.43 644,238 3,3644238 25.49 494,153 3,494,153 25.49 628,131 3,628,131 23.06 764,329 2,764,329 61.26 23,456 2,023,456 61.26 624,213 3,624,213 61.26 498,974 3,498,974 127.31 39,197 4,039,197 127.31 401,568 4,401,568 116.24 772,424 3,772,424

1

3.88

0.51 1000k

12.5

2

18.21

2.42 1000k

25

3

77.80

5.83 1000k

37.5

4

83.03

11.07 1000k

50