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. S., Elefteriades, J. A. (2006). Novel measurement of relative aortic size predicts rupture of thoracic aortic aneurysms. Ann. Thorac. Surg ., 81 , 169–177. Duprey, A., Khanafer, K., Schlicht, M., Avril, S., Williams, D., Berguer, R. (2010). In vitro characterization of physiological and maximum elastic modulus of ascending thoracic aortic aneurysm using uniaxial tensile testing. Eur. J. Vasc. Endovasc. Surg ., 39 , 700–707. Elefteriades, J. A. (2002). Natural history of thoracic aortic aneurysms: Indications for surgery, and surgical versus nonsurgical risks

Abstract

The paper presents the results of mechanical properties research of samples made in the Selective Laser Sintering technology. Polyamide powder PA 3200 GF reinforced with glass fiber was the material used to build the model. Samples subjected to a uniaxial tensile test were made in accordance with ASTM D638 – V standard. The printing direction was the technological parameter of the study. The analysis of the results showed that the addition of fiberglass significantly influenced the improvement of mechanical properties, especially the isotropic of mechanical properties with respect to the printing direction.

material studied are summarized in Table 2 . Table 2 Characteristics of HDPE Studied Density 930 kg/m 3 Molecular weight (Mw) 310,000 (g/mole) Crystallinity rate(Xc) 74% Fusion temperature ( T f ) 203°C Fluidity index 0.2−1; 4 g/10 (min) Black carbon 2−2.5% 2.2 Uniaxial tensile tests UT The uniaxial tensile tests UT were carried out on dumbbell specimens of type IV ( Figure 2 ): thickness T = 6 mm, width of narrow section W c = 6 mm, length of narrow section L = 33 mm, width overall W o = 19 mm, length overall L o = 100 mm, gage length G = 25 mm, distance

orientation and tensile strength of natural collagen membranes for heart valve leaflets. Anales de Mecánica de la Fraktura 28, 1 (2011), 51-55. 7. http://www.alveo.4poziom.net/slowniczek,b,BLONA%20SUROWICZA.html , access date: 5.01.2014 8. Lavrijsen T., Validation of indentation tests on porcine Pericardium against uniaxial tensile tests. BMTE 07.41, December 2007, Internship BME -master 9. Garcia Páez JM, Jorge-Herrero E, Carrera A, Millán I, Rocha A, Salvador J, Mendez J, Téllez G, Castillo-Olivares J., Porcine pericardial membrane is subjected tensile testing

References [1] Bao, L., et al. (1997). Error Evaluation in Measuring the Apparent Possion’s Ratios of Textile Fabrics by Uniaxial Tensile Test. Sen’i Gakkaishi, 53(1), 20–26. [2] Bassett, R. J., et al. (1999). Experiment Methods for Measuring Fabric Mechanical Properties: a Review and Analysis. Textile Research Journal, 69(11), 866–875. [3] Chen, B., Govindaraj, M., (1996). A Parametric Study of Fabric Drape. Textile Research Journal, 66(1), 17-24. [4] Clulow, E.E., Taylor, H. M., (1963). An experimental and theoretical investigation of biaxial stress

.203. 68. Ohayon J, Finet G, Le Floc’h S, et al. Biomechanics of atherosclerotic coronary plaque: site, stability and in vivo elasticity modeling. Ann Biomed Eng. 2014;42:269-279. doi: 10.1007/s10439-013-0888-1. 69. Walsh MT, Cunnane EM, Mulvihill JJ, Akyildiz AC, Gijsen FJ, Holzapfel GA. Uniaxial tensile testing approaches for characterisation of atherosclerotic plaques. J Biomech. 2014;47:793-804. doi: 10.1016/j.jbiomech.2014.01.017. 70. Huang X, Yang C, Zheng J, et al. 3D MRI-based multicomponent thin layer structure only plaque models for atherosclerotic plaques. J

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. Onion epidermis was chosen due to its simple single-layer structure, the lack of intercellular spaces and ease of sample preparation. The geometry of the FEM model was created on basis of images obtained using a confocal scanning laser microscope CSLM (OLYMPUS FluoView300, Olympus Corporation, Tokyo, Japan). The geometrical features of onion tissue were reconstructed in FEM environment by means of vectorization procedure. Then, uniaxial tensile test were carried out to determine the mechani- cal parameters of tissue samples. Mechanical testing was carried