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Supported by 2D and 3D Imaging Methods Investigation of the Influence of Fiber Orientation on the Mechanical Properties of the Composites Reinforced with Fibers in a Polymer Matrix

Saraczyn Robert, Deroszewska Martyna, Kowaluk Tomasz, Skołek Emilia, Rządkowski Witold, Myszka Dawid

Advances in Science and Technology. Research Journal

2023

Vol. 17, no 3

170--183

The aim of this study was to examine the behavior of the carbon fiber reinforced polymer (CFRP) composites depending on the fiber orientation and to understand the influence of microstructural discontinuities on mechanical properties. For the tests 210 gsm prepreg composite and 200 gsm carbon fabric with polymer matrix have been used. Samples were structured and later examined according to the ASTM-D3039 and ASTM-D3878 (equivalents are ISO 20975, ISO 527-4 and ISO 527-5). Accordingly, to the number of layers, three ways of the fibers arranging in relation to the applied force were used. Mechanical properties were determined in a static tensile test. The results of imaging studies, which included analyzes of Digital Image Correlation, Computed Tomography and Scanning Electron Microscopy, showed structural discontinuities, specific stress distribution and propagation of stresses depending on the production technology, which were correlated with the obtained strength results. The source of the gradual development of the degradation of the composite structure was observed in local microdamages and microcracks. As a result of a sub-critical crack growth within the resin matrix material, the defects are subject to a complex, multi-axial stress field on the micro-scale, even if the globally applied force is axial. Samples in which the load was applied along the axis of the fibers behave like an elastic material, while samples, where the force is applied at an angle to the axis of the fibers, tend to behave like an elastic-plastic material.

NSMET – Narodowa Sieć Metrologii Współrzędnościowej w ramach Polskiej Mapy Infrastruktury Badawczej

Wieczorowski Michał, Gapiński Bartosz, Gąska Adam, Sładek Jerzy, Woźniak Adam, Kowaluk Tomasz, Kujawińska Małgorzata, Stępień Krzysztof, Adamczak Stanisław

Stal, Metale & Nowe Technologie

2021

nr 3-4

52--61

Konferencje, kongresy i wszelkiego rodzaju sympozja organizowane w świecie rzeczywistym mają różne cele i efekty. Oprócz niezaprzeczalnych wartości naukowych wynikających z prezentowanych dokonań i świadomości, w którą stronę zmierza nauka, są też doskonałą okazją do spotkań w mniejszym gronie, wymiany doświadczeń w rozmowach kuluarowych i burzy mózgów powodującej koncepcje nowych badań i projektów. A zatem cofnijmy się do 2019 roku, kiedy nikomu jeszcze nie śniło się o pandemii, i przywołajmy wspaniałą atmosferę VIII Kongresu Metrologii, zorganizowanego w Augustowie przez Politechnikę Białostocką.

Conferences, congresses and all kinds symposia organized in the real world have different goals and effects. In addition to the undeniable scientific values resulting from the presented achievements and the awareness in which direction science is heading, they are also an excellent opportunity to meet in a smaller group, exchange experiences in unofficial conversations and brainstorm the concepts of new research and projects. So let’s go back to 2019, when no one even thought that a pandemic was possible, and recall the wonderful atmosphere of the 8th Metrology Congress, organized in Augustów by the Białystok University of Technology.