Repozytorium publikacji - Politechnika Gdańska

In this paper the results of experimental data from fracture test and numerical calculations under critical loading (at the moment of crack initiation) were presented. The polycarbonate specimens were subjected to tension. The flat notched elements (V-type edge notches with different root radii: 0.1, 0.5, 2 and 10 mm) were made in two thicknesses: 5 and 15 mm. The ARAMIS 3D 4 M vision system for non-contact displacement measurements, was used to record the elongation of the measurement base. During the tests, PHANTOM cameras were also used, allowing the precise indication of the crack initiation moment and, consequently, a more accurate estimation of measured values: the critical tensile force and specimen elongation. The microscopic observations were used to indicate the sites of crack initiation. The different characteristics of the polycarbonate fracture process, which were determined by specimens thickness and notch root radii. The reasons for these differences are described. The numerical calculation using finite element method were carried. Depending on the fracture type, possible stress-strain relationships for use in predicting critical loading are indicated. The main motivation for conducting the research described in the manuscript is to understand the nature of the fracture phenomenon occurring in polycarbonate (PC). This material is widely used in engineering practice and its properties at different operating parameters vary, the fracture process itself can be brittle or ductile. The manuscript attempts to answer the questions of how the geometrical parameters of notched specimens affect the initiation of fracture, i.e. when and where it occurs. Knowing this process allows the formulation of tools for predicting critical loading conditions, an important step in engineering design.

Autorzy

• dr inż. Elżbieta Bura,
• dr inż. Jakub Augustyniak,
• prof. dr hab. inż. Andrzej Seweryn link otwiera się w nowej karcie