Experimental and estimated determination of mechanical characteristics of 3D printed ABS plastic samples under tension

The paper introduces the results of an experimental study of the mechanical characteristics of 3D printed ABS plastic ABSplus-P430 samples under tension. These 3D printed samples differ in the orientation of the material layers, formed by the position of the samples when printed, and the print raster pattern. During the tests, the material showed isotropic properties in terms of Young’s modulus and anisotropic properties for elongation at break, yield strength, and ultimate strength. We revealed that the print orientation relative to the direction of the applied load significantly affects the strength of the tested samples. Using the obtained test results, the specified parameters of the bilinear model of the material were identified by performing a series of computational studies using computer finite element models of material samples. The found parameters of the bilinear model of the material can be used to carry out computational estimation of the strength and bearing capacity of ABS plastic products manufactured by 3D printing. The results obtained also make it possible to develop recommendations for the orientation of products in the printing area according to the criterion of ensuring the greatest strength, taking into account the loading mode of the product.

Dotted Raster-Stereography

Raster-stereography is a 3D surface topography technique that provides height and curvature information of the subject. This is a non-contact, non-invasive, and radiation-free technique that is mostly used to analyze the back shape of a human body. The most practical aspect of raster-stereography is ease in its apparatus setup and reduced exposure to x-rays. Another very important and effective application is to identify the human faces that can be used in security domain. The problem of breaking lines was observed while traversing the distorted raster pattern on the human body. These breaks in raster pattern increased significantly when projected on the face. Computationally, it becomes difficult to extract all valid curvatures of the human face. This problem was resolved using a modified dotted raster, and the noise effect was reduced substantially. The dotted raster technique proved that it is by far the best option when compared with the conventional line grid.

Mix-use adaptations in sustainable regeneration of barrack complexes

Historical barrack complexes constitute a separate genre in architectural typology and a crucial component of cultural landscape in garrison towns. Their construction impacted spatial development of historic cities. Military compounds were usually formed in a raster pattern, which spawned the grid plan further to adjacent streets forming a connection with the existing urban area, thus stimulating growth and modernization of cities. Originally positioned on the outskirts, today they become liaisons between historic downtowns and contemporary suburbs. They are excellently suited for that role, because by default they are utilitarian. Still they are endangered and neglected. For singleminded investors their material substance is worthless compared to the land they stand upon. The Wrzeszcz Barracks give proof that there exists a way to innovatively reintroduce this genre into city scope. Following in the footsteps of European exponents in Turin or Freiburg, the ‘Garnizon Neighborhood’ is one of the most successful mix-use regeneration efforts of post-military complexes in Poland. The paper constitutes a case study of regeneration indicating its strong and weak points in relation to similar undertakings.

Dotted Raster-Stereography

Raster-stereography is a 3D surface topography technique, which provide height and curvature information of the subject. This is a non-contact, non-invasive and radiation free technique, which is mostly used to analyze the back shape of human body. The most practical aspect of raster-stereography is ease in its apparatus setup and reduced exposure to x-rays. Another very important and effective application is to identify the human faces that can be used in security domain. The problem of breaking lines was observed while traversing the distorted raster pattern on human body. These breaks in raster pattern increased significantly when projected on the face. Computationally it becomes difficult to extract all valid curvatures of the human face. This problem was resolved using a modified dotted raster and the noise effect was reduced substantially. The dotted raster technique proved that it is by far the best option when compared with the conventional line grid.