PSI - Issue 68

Büşra Eyri et al. / Procedia Structural Integrity 68 (2025) 332 – 338 B. Eyri et al. / Structural Integrity Procedia 00 (2025) 000–000

336

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Table 2. The mechanical properties of the samples procured from the three-point bending test. Flexural Properties Sample Name σ (MPa) E (GPa) ε (%) ABS_OX

5.59 6.52 2.58

1.2 2.45 0.26 2.31 2.55 0.45

5.66 2.69 26.25

ABS_D ABS_R PLA_OX

12.21 12.74 3.82

6.28 3.64 18.6

PLA_D PLA_R

The natural frequency values for both materials, as outlined in Table 3, demonstrate that diamond cell structure attains the highest frequency value. When the samples are arranged in descending order of their bending modulus values, the D˃OX˃R ranking emerges. This same ranking is also evident in the natural frequency values. The spring constant, K, is a measure of the stiffness of a system and has a direct effect on the natural frequencies. An increase in the spring constant results in the system vibrating at a faster rate, which in turn increases the natural frequency of the sample. In accordance with Hooke's Law, the stiffness K is directly proportional to the elasticity modulus E. Therefore, a more rigid material (with a higher elasticity modulus) will result in a structure that is also more rigid (Noel et al. 2024).

Table 3. Vibration test response of the samples. ABS

PLA

Overexpanded (OX) Diamond (D) Re-entrant (R)

19.375 Hz 21.25 Hz 18.75 Hz

23.75 Hz 25 Hz 19.375 Hz

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Figure 3. Laser sensor displacement responses of the samples.

Table 4. Logarithmic decrement and damping factor values of the samples. ABS

PLA

Overexpanded (OX) Diamond (D) Re-entrant (R)

19.375 Hz 21.25 Hz 18.75 Hz

23.75 Hz 25 Hz 19.375 Hz