Forming limit curves (FLC) of deep drawing steel sheets have been determined experimentally and calculated on the base of the material tensile properties following the Hill, Swift, Marciniak-Kuczyński and Sing-Rao methods. Only the FLC modeled from a singly linear forming limit stress curve exhibits good consistence with experimental curve. It was established that a linearized limit stress locu...

P. Pokorný, D. Dobiáš, M. Vokáč – Czech Technical University – Klokner Institute, Prague, Czech Republic This paper evaluates the effect of initial corrosion damage to the surface of the hot dip galvanized steel coating in fresh concrete on its final bond strength. The tests were performed on uncoated and hot-dip galvanized ribbed reinforcements. The measurement of bond stress (τm) according to...

In this study, arc and friction stir hybrid welding (AFSHW) was proposed to weld aluminum-steel dissimilar metals in attempt realize high quality joining. Firstly, an interlayer produced on galvanized steel by using bypass current-metal inert gas (BC-MIG), then aluminium plate jointed via Friction lap (FSLW). The effects of tool pin length FSLW times the microstructure mechanical properties joi...

The study evaluates corrosion resistance of steel profiles in contact with monolithic foam concrete a thickness 5 and 10 mm. There are two types samples: structural ones cold-formed galvanized ones. A visual examination samples exposed to high temperature relative humidity is carried out. made full provides. Metal passivation (formation protective film) occurs due the alkalinity concrete. pH va...

INTRODUCTION Air pollution in confined environments is a serious health problem, in that most people spend long periods indoors (in homes, offices, classrooms etc.). Some people (children, the elderly, heart disease patients, asthmatic or allergic subjects) are at greater risk because of their conditions of frailty. The growing use of air-conditioning systems in many public and private building...

This study analyzes the limitations of low-frequency EIS impedance modulus as a tool to describe protective properties organic coatings subjected accelerated aging tests. Acrylic clear-coated steel and hot-dip galvanized were exposed test methods such neutral salt spray chamber Prohesion for up 2000 3000 h, respectively. During exposure, monitored by visual inspection. We observed significant d...

A three-dimensional (3D) finite element (FE) model is applied to predict the temperature evolution in the laser welding of galvanized high-strength steels in a zero-gap lap joint configuration. A rotary Gaussian volumetric heat source model is introduced to simulate the laser energy input. The temperature data measured by thermocouples are used to verify the boundary conditions of the thermal m...

This study is a detailed failure analysis of galvanized high carbon steel wires, which developed coating cracks during the torsion test performed as a quality control at the end of the manufacturing process. Careful visual inspections showed that the cracks are already present in the coating before the torsion test. In order to explain the origin of these cracks, systematic metallographic inves...