Monika Duda

Wrocław University of Science and Technology | WUT · Institute of Materials Science and Applied Mechanics

T article addresses the results of the study of the examination of fatigue fracture in mixed and I+II and I+III modes in heat treated steel 42CrMo4. Three types of thermal treatments were performed, each caused various mechanical properties of the material. Tests were performed on two sample types: compact tension specimen (CTS) and rectangular cro...

The paper contains the results of an experimental investigation of fatigue crack development under mixed-mode I + II and I + III in heat-treated 42CrMo4 steel. Tests were performed on heat-treated compact tension shear specimens and rectangular cross-section specimens for mixed-mode I + III. Mixed-mode I + II tests were conducted for 30 and 60° loa...

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...

Nowadays diamond abrasive wire cutting has become a technology associated mainly with electronics and photovoltaics. This method allows obtaining silicon substrate plates (wafers) on a mass and global scale. However, isn’t the potential of the diamond wires much greater? The article presents the possibilities of using armed strings in areas where s...

This paper contains experimental results of mechanical testing of the AISI 304 steel with composite coatings. The main goal was to investigate the impact of the applied polyurea composite coating on selected mechanical properties: Adhesion, impact resistance, static behavior, and, finally, fatigue lifetime of notched specimens. In the paper the fol...

The paper presents the results of an experimental investigation of the fatigue crack growth in plane specimens made from puddle iron. Eiffel Bridge from Portugal and 19th-century viaduct steel member from Poland. The tests were performed under the load ratios 𝑅 = 0.05, 0.1 and 0.5. There were also considered the different description of fatigue cra...

The paper summarises an experimental study on the fatigue crack propagation and cracks paths in ancient steel-19th-century puddle iron from the Eiffel bridge. The tests were performed with the load R-ratio equal to 0.05 and 0.5. All tests were performed under different notch inclinations (mode I + II). The fatigue crack growth rate in the tested ma...

The maintenance and safety of ancient bridges is a major concern of governmental authorities. In particular, the safety of old riveted bridges fabricated and placed into service at the end of the 19th century deserves particular attention. These structures are susceptible to exhibit high fatigue damage levels due to their long operational period wi...

Purpose For nowadays construction purposes, it is necessary to define the life cycle of elements with defects. As steels 42CrMo4 and 41Cr4 are typical materials used for elements working under fatigue loading conditions, it is worth to know how they will behave after different heat treatment. Additionally, typical mechanical properties of material...

In repairing and strengthening operations of ancient riveted steel bridges is important to estimate and assess the structural degradation of the old metals in order to guaranty the structural safety. Long-time operated metallic materials (mild, rimmed low carbon steels <0.1%C, puddle irons) subjected to cyclic loading show tendency to the microstru...

The maintenance of the old steel structures is one of the main challenges in engineering practice – mainly due to the lack of the experimental data performed for existing old steel structures erected at the turn of the 19 th and 20 th centuries. In this paper the fatigue crack growth behavior in structural components from the old 19 th (and early 2...