Steel plates in double skin composite (DSC) panels are restrained by a concrete core and welded stud shear connectors at discrete positions. Local buckling of steel plates in DSC panels may occur in a unilateral mode between stud shear connectors when subjected to combined states of stresses. This paper studies the local and post-local buckling strength of steel plates in DSC panels under biaxi...

To evaluate the fatigue life of Q420C steel welded joints, tests were performed on butt-welded cross-butt-welded joints and cross-fillet-welded joints. The strength S-N curves fitted. Then formation development cracks analyzed by fracture morphology. properties compared with literature data standard curves. results showed that test three types roughly above Moreover, joint was significantly hig...

usd7 is one of the steel products of isfahan steel company. it is cast in continuous casting moulds and rolled up to a rod of 5 mm diameter. finally, it is wire drawn up to 3 mm and used as welding electrodes. this steel contains 0.05 to 0.09 wt. % carbon. the acceptable limit of the aluminium in this class of steel is less than 0.003 wt%. therefore, it is categorized as rimmed steel. during fo...

Friction stir welding is a relatively new solid state joining process, which is suitable for welding similar and dissimilar materials.  The present research work concentrates on the effect of tool rotational speed on the tensile, microstructural properties and microhardness of the friction stir welded joints of different grades of austenitic stainless steel sheets. Four different tool rotationa...

In the present work, a high power Nd:YAG laser has been employed to weld AISI 430 ferritic stainless steel thin sheets. Optical microscopy was used to study the microstructural evolutions during laser welding. Tensile test and microhardness measurement were employed in order to investigate the mechanical behaviors of welds. Also, vibrational sample magnetometry was used for characterizing magne...

Gap between the steel tube and core concrete of Concrete-Filled Steel Tube (CFST) members is regarded as an initial imperfection, which may exist in CFST arch bridge due to construction process problems. In this paper, based on design scheme bolt-welded joints rib columns extra-long span bridge, effects two types imperfections, interfacial gap spherical-cap gap, mechanical properties Bolt-Welde...

A pure Ni interlayer with a thickness of 0.1 mm was introduced between high-strength interstitial free steel and Al–Mg–Si alloy, which were friction stir lap welded, producing an excellent welded joint. The interface layer consisted γ-Ni solid solution, the mixed stirring zone contained alternate lamellae α-Fe solutions. addition strongly suppressed reaction Al Fe because atomic arrangement Ni....

In this work, local properties such as hardness and fatigue crack grow rate in the heat-affected zone of four laser-welded butt joints thin high-strength low-alloy steel were examined, so to explain predict lives at high stress levels through fracture mechanics approach. The different welded series presented a similar growth fusion zones, but lower than base metal due higher bainitic–martensiti...

Engineering fatigue fracture failure is one of the most common phenomena of mechanical and structural failure, statistically representing approximately 50 to 90% of total mechanical damage [1]. Lattice structures have been widely used in crane booms, steel plants, parking garages, offshore platforms and other fields [2] to [4]. In a crane, the lattice boom has better mechanical properties compa...