Basing on the performances analysis of the expandable tube material, the paper introduces the FMA multiphase alloy steel, the new type of expandable material. The conclusions were presented at the detailed analysis of material microstructure, chemical composition, heat treatment, mechanical properties and other aspects. This paper will promote the application of this new material.
Based on Johnson-Cook constitutive equation energy absorbed by tubes under axial crush load is studied by using Singace fold model with considering strengthening effects of strain rate,strengthening effects of strain and softening effect of temperature which should consider heat exchanged ; the total energy absorbed by tubes,mean load and load-displacement curve are obtained by method of divided step fold; and the relation between them and radius of tube,thickness of tube,fold velocity of tube is analysed.
This paper focuses on steel columns with flange joints in prefabricated steel frame structures. To investigate the compressive performance of such steel columns, fifteen specimens were tested. The experimental results indicate that, compared to non-joint columns, the bearing capacity and bending stiffness of high-strength bolt joint columns and bolt tapping columns are less, but they can transfer the compressive load better. The failure mode of the steel columns was ductile failure. This study aims to promote the adoption of prefabricated steel frame structures and the improvement of standards. Index Terms-Compressive behavior, prefabricated steel frame structure, high-strength bolt joint, bolt tapping joint.
This paper briefly introduces the weld cladding structure, its common defects during the manufacture and operation stage and its application in pressurized water reactor nuclear power plants. Some ultrasonic testing codes or standards for nuclear power plant pressure vessel or piping, such as ASME BPVC volume V & III & XI, Germany KTA 3201.3 and 3201.4 code, France RCC-M and RSE-M code, and Russia code of light water nuclear power plants were discussed.
The difference of those codes and some feed backs have been analyzed and discussed. Furthermore, these works really benefit the compiling of NB/T 20003.2-2010, Non-destructive Testing for Mechanical Components in Nuclear Island of Nuclear Power Plants-Part 2: Ultrasonic Testing, as China building more and more nuclear power plants.
It was concluded that we shall pay more attention to the inspection of cladding, not only at manufacture stage but in operation outage stage. One of important work is periodically updating the inspection standard revision. It was believed that improving the cladding defects inspection reliability and effectiveness is very important to the safety of nuclear power plants operation in China and in the world.
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