Cold-Formed Lean Duplex Stainless Steel Rectangular Hollow Sections in Combined Compression and Bending

An experimental investigation of cold-formed lean duplex stainless steel members in combined compression and minor axis bending is performed. The test specimens were cold-rolled from flat strips of lean duplex stainless steel grade EN 1.4162 into two rectangular hollow sections. Different eccentricities were applied to the rectangular hollow sections, so that a beam-column interaction curve for each series of test can be obtained. Initial overall geometric imperfections of the members were measured prior to testing. The ultimate loads and the failure modes of each specimen were obtained. Failure modes include flexural buckling as well as interaction of local and flexural buckling were observed from the test specimens. The test strengths were compared with the design strengths predicted by the American, Australian/New Zealand and European specifications for stainless steel structures. It should be noted that these specifications do not cover the material of lean duplex stainless steel. Generally, the specifications are capable of predicting the beam-column strengths of the lean duplex stainless steel test specimens

Lean duplex stainless steel material tests at elevated temperatures using steady state method

A test program to investigate the material properties of a relatively new cold-formed lean duplex stainless steel under elevated temperatures is presented. A total of 44 tensile coupon tests were carried out by steady state method for temperatures ranged from 24 to 900 ºC. Material properties including Young’s modulus, yield strength, ultimate strength and ultimate strain were obtained. The test results and available data were compared with the design values in the European Code as well as a unified equation by Chen & Young for stainless steel. The lean duplex stainless steel is not covered in these existing design rules. It is shown that the material properties of lean duplex stainless steel under elevated temperatures cannot be well predicted by the existing design rules

Finite element analysis of tidal turbine blade subjected to impact loads from sea animals

The present work investigates structural response of tidal stream turbine blades subjected to impact loads from sea animals. A full-scale tidal turbine blade model was developed using a finite element modelling software ABAQUS, while a simplified geometry of an adult killer whale (Orcinus orca) was assumed in simulating impact on the blade. The foil profiles along the turbine blade were based on the NACA 63-8XX series, while the geometric and material properties of the sea animal were calibrated with experimental results. The numerical model simulated the dynamic response of the blade, accounting for radial velocities of the blade corresponding to real life scenarios. Different magnitudes and trajectories of the velocity vector of the sea animal were simulated, in order to investigate their influence on the turbine blade’s plastic deformation. Furthermore, multiple impacts were analysed, in order to monitor the accumulation of plastic strain in the material of the blade. Finally, the potential application of stainless steel material in tidal stream turbine blades for impact resistance was evaluated, through comparison of numerical results obtained from models using stainless steel and mild carbon steel materials

Tests of Concrete-filled High Strength Steel RHS and SHS Beams

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