Piotr Kotowski

Wroclaw University of Science and Technology | WUT · Department of Mechanics, Materials Science and Engineering

This paper describes results of tensile mechanical strength testing of two types of composite suspension line insulators from two manufacturers. In order to take into account the operation of composite insulators in overhead transmission lines with high-temperature low-sag (HTLS) conductors, the testing of their static and fatigue strength was perf...

The presented research is focused on an investigation of the effect of the addition of polyvinyl alcohol (PVA) to a gelatin-based hydrogel on the functional properties of the resulting material. The main purpose was to experimentally determine and compare the properties of hydrogels differing from the content of PVA in the blend. Subsequently, the...

The presented work contains experimental results of fatigue crack growth rate in 42CrMo4 steel. All performed investigations were focused on fatigue crack growth rate and fatigue crack closure effect under mode I and mixed-mode (I+II) loading conditions. For the experimental campaign, CTS (Compact Tension Shear) specimens were involved. Steel 42CrM...

In the paper, experimental results of fatigue crack growth were presented. The main object of authors’ investigation was a fatigue crack path determined under mixed mode (I+II) loading condition. For this purpose the CTS (compact tension shear) specimens were used. The tests were performed under the load ratio R = 0.1 and constant amplitude loading...

In this paper, the analysis of the possibility of regeneration the freight wagon body for transporting loose materials is presented. The proposed solution is based on increasing the stiffness of the load space walls by using the composite panels. Analysis of material behavior in a combination of steel sheet and glass-epoxy composite was carried out...

The work presents the research conducted on the impact resistance of newly developed metal-ceramic composites with aluminum matrix on firing with 5.56 × 45 mm caliber intermediate ammunition. For this purpose, materials based on AC-44200 alloy reinforced with Al2O3 particles were made using the squeeze casting method. The ballistic resistance was c...

W ostatnich dwóch dekadach obserwuje się intensywny rozwój narzędzi do anali-zy powierzchni przełomu i charakteryzacji jego topografii w ujęciu ilościowym. Na tym tle interesującym narzędziem, dobrze zdefiniowanym matematycznie i rozwijanym in-tensywnie w wielu ośrodkach, jest geometria fraktalna, której zastosowanie w mechani-ce pękania materiałów...

Under process of failure of material sample a part of energy delivered to the sample is used to shape a surface of fracture. A hypothesis is assumed that from a shape of ceramic material fracture same information regarding the material an a method of its failure can be obtained. To this purpose fractal dimensions for investigated fracture surfaces...

In this study, a complete method of determination of the fractal dimension for fracture surfaces of ferrous alloys has been proposed. This dimension is determined for the vertical profile obtained by the profile technique cross-section. The image of the profile, seen through the microscope coupled with a camera, is recorded in a computer, where num...

An investigation of an influence of loading parameters on fractal dimension of electrotechnical ceramics fracture has been presented. Investigation objects were samples made of C110 and C130 ceramics. Specimens were breaking under cyclic and static loading conditions. To estimate fractal characteristics a method used for metals fracture had been ad...