PSI - Issue 18

Dan Ioan Stoia et al. / Procedia Structural Integrity 18 (2019) 163–169 Dan Ioan Stoia, Liviu Marsavina/ Structural Integrity Procedia 00 (2019) 000–000

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Table 2. Elastic and fracture properties of Alumide in 3-point bending test

θ (deg)

F max. (N)

a (mm)

E bend (MPa)

K IC (MPaꞏm 1/2 )

δ at F max (mm)

σ bend (MPa)

0

711.8 ± 96.92

3.12 ± 0.58

No notch

401.91 ± 8.81

20.99 ± 2.44

-

45

478.8 ± 47.73

3.08 ± 0.70

No notch

282.76 ± 18.84

14.37 ± 1.43

-

90

496.8 ± 46.39

4.04 ± 0.88

No notch

281.14 ± 12.07

14.91 ± 1.38

-

0

145.8 ± 8.43

1.52 ± 0.04

9.63 ±0.13

-

-

0.98 ± 0.07

45

114.8 ± 12.45

1.50 ± 0.31

10.03 ±0.23

-

-

0.79 ± 0.08

90

106.6 ± 8.98

1.46 ± 0.15

10.44 ±0.17

-

-

0.76 ± 0.05

4. Conclusions Rectangular section beams have been built using Alumide material by selective laser sintering. The samples were subjected to 3-point bending test in order to determine the mechanical properties and the correlation of these with the orientation angle. Regarding the geometrical aspects, 0.5 to 1% relative error was recorded XY plane dimensions, while large 6- 7% relative error were recorded for the direction of growing (Z). The density of the samples is highly influenced by the orientation angle, the highest density being recorded for the parts that were oriented along the X axis (0 deg.). Also, this orientation lead to superior mechanical properties. Orienting the samples in the building environment along the X axis of the machine will lead to better results than for the other orientation angles. Acknowledgements This work was supported (in part) by research grant GNaC2018 - ARUT, no.1363/01.02.2019, financed by Politehnica University of Timisoara. References Ahmed, A.A., Susmel, L., 2018. A material length scale–based methodology to assess static strength of notched additively manufactured polylactide (PLA). Fatigue Fract Eng Mater Struct. 41, 2071– 2098. Berti, G., D'Angelo, L., Gatto, A., Iuliano, L., 2010. Mechanical characterisation of PA-Al2O3 composites obtained by selective laser sintering, Rapid Prototyping Journal. 16, 124 – 129. Es-Said, O.S., Foyos, J., Noorani, R., Mendelson, M., Marloth, R., Pregger, B.A., 2000. Effect of layer orientation on mechanical properties of rapid prototyped samples. Mater. Manuf. Process. 15, 107-122. Galantucci, M., Bodi, I., Kacani, J., Lavecchi, F., 2015. Analysis of dimensional performance for a 3D open-source printer based on fused deposition modeling technique, Procedia CIRP 28, 82 – 87. Dizon, J.R.C., Espera, A.H., Chen, Q., Advincula, R.C., 2018. Mechanical characterization of 3D-printed polymers, Additive Manufacturing, 20, 44-67. Lieneke, T., Denzer, V., Guido, A., Adam, O., Zimmer, D., 2016. Dimensional tolerances for additive manufacturing: Experimental investigation for Fused Deposition Modeling, Procedia CIRP 43, 286 – 291. Mousa, A.A., 2006. Experimental investigations of curling phenomenon in selective laser sintering process. Rapid Prototyping J. 22, 405-415. Nuñez, P.J., Rivas, A., García-Plaza, E., Beamud, E., Sanz-Lobera, E., 2015. Dimensional and surface texture characterization in Fused Deposition Modelling (FDM) with ABS plus, Procedia Engineering 132, 856 – 863. Pham, D.T., Gault, R.S., 1998. A comparison of rapid prototyping technologies. Int. J. Mach. Tool. Manu. 38, 1257-1287. Pilipović, A., Brajlih, T., Drstvenšek, I., 2018. Influence of Processing Parameters on Tensile Properties of SLS Polymer Product. Polymers. 10, 1208. Razavi, S.M.J., Berto, F., 2019. Fatigue strength of notched specimens made of Ti-6Al-4V produced by Selected Laser Melting technique, Procedia Structural Integrity. 13, 74-78.