PSI - Issue 42

Theodoros Marinopoulos et al. / Procedia Structural Integrity 42 (2022) 903–910 T. Marinopoulos et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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Figure 3. Maximum loads sustained by 3D printed sockets for two different designs and material from two different manufacturers (Mean values are in red, with bars showing minimum and maximum values. Blue boxes define 25 th to 75 th percentile for 5 samples.) Samples that failed exhibited a brittle fracture at the distal posterior site of the socket. The crack was always parallel to the printing direction (Fig. 4).

Figure 4. Typical failure mode of tested 3D printed prosthetic sockets with brittle crack at distal posterior site of socket, parallel to printing direction

3.2. Numerical results At 8000 N compressive load, a maximum von Mises stress of 70.39 MPa was found at the distal end of the internal surface of the original socket (Fig. 5). The major stress concentration was observed in the distal socket, with stresses spreading around in a cylindrical fashion. The contour of the stress distribution in the original socket was used to