Materials Literature
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The mathematical, multiphysic, multidimensional, and electrochemical modelation of a high temperature solid oxide fuel cell system (planar electrolyte-supported configuration) is discussed in the present paper. The mass transport within the cell is studied using the Stefan-Maxwel model, and the momentum balance is sol…
Photoluminescence and Raman scattering measurements were performed on Si-doped GaInP grown on Ge. The deep broadband photoluminescence (PL) emission centered around 1.4 eV exhibits a strong dependence of strength on Si dopants, which is suggested to be due to [Ge(Ga,In)-V(Ga,In)] complexes. A strong evidence to suppor…
Filler material used for welding operations can lead to the occlusion of hydrogen gas in the arc atmosphere into the solidifying weld metal. This amount of hydrogen as well as the one originally present in the parent metal rapidly diffuses into the various regions of the weldment due to the high temperature depending…
In recent years, reports have increased which are about failure cases caused by high cycle thermal fatigue both at light water reactors and fast breeder reactors. One of the biggest reasons of the cases is a turbulent mixing at a Tee-junction, where hot and cold temperature fluids are mixed, in a coolant system. In or…
Tujuan Penelitian ini adalah untuk mengetahui pengaruh komposisi sekam padi, PVAc dan nanosilika (nanopartikel SiO2) terhadap kekuatan tekan material nanokomposit yang telah dibuat. Metode penelitian yang digunakan dalam penelitian ini adalah metode simple mixing dan metode hot press. Temperaturpenekanan yang digunaka…
This paper presents the results of the research activities of the subcommittee on Hydrogen Embrittlement of the Japan Pressure Vessel Research Council (JPVRC). The combined effect of temper embrittlement and hydrogen embrittlement in Cr-Mo steels is discussed. It has been recognized that Cr-Mo steels used widely in th…
The previous paper[1] reported the fracture test results using pipe models (8B and 14B for bending) with an alloy 132 weld joint at room temperature and high temperature (325degC). The predicted loads by limit load evaluation method of the pipes at 325 deg C (8B and 14B) and at room temperature (8B) with the initial s…
Aluminum Plate Fin Heat Exchangers (Al-PFHE) are often used in low temperature applications of chemical plants when huge heat transfer capacities are required. Typically the equipment is insulated or installed in insulated containments — so called “Cold Boxes”. Al-PFHE may either fail by corrosion or by mechanical ove…
In technical codes and standards the strength assessment of pressurized components and systems is usually performed by limitation of fictitious elastic stresses as well as by limitation of the fatigue level. It shall be proven that the highest stresses resp. stress ranges caused by external loading show a specific mar…
Background and purpose: Human hepatocellular carcinoma (HCC) is one of the most common causes of death in the world. Targeted drug delivery to cells, tissues or specialized receptor cells is an advanced technology in treatment of HCC. The purpose of this study was to investigate the cytotoxicity properties of DTX nano…
The inflation and peel-off characteristics of a multilayer insulation (MLI) blanket under a depressurization environment have been evaluated for establishing a JAXA design standard. The venting conductance of gas flow from inside to the outside of MLI was evaluated in a steady state test, and was confirmed to take a v…
We develop a simple and versatile platform to construct the surface nanotopography of a substrate by thermal fixation of colloidal particles. The micrometer-size particles of polystyrene are dispersed in a random monolayer on a substrate by spin-coating and transformed into hemispherical nanostructures with high mecha…
Purpose The purpose of this paper is to investigate the effects of different shape memory polymer based snap‐fits in terms of disassembly time and reusability. Design/methodology/approach In total, six different sets of snap‐fits were designed and manufactured. Each set of snap‐fits was tested ten times in a testing d…
The current paper describes finite element simulation of the complete manufacturing and service exposure history of girth-welded austenitic steel pipes fabricated from ESSHETE 1250 material for the STYLE Framework 7 project. The simulation campaign examines the impacts of prior quenching of pipe material, fabrication…
The use of creep strength enhanced ferritic alloys such as Grade 91 in fossil power plants has become popular for high temperature piping applications. Since Grade 91 has higher stress allowables than Grade 22, a designer can specify thinner component wall thicknesses, resulting in lower through-wall thermal stresses…
The implementation of a semi-empirical solid-state phase transformation subroutine in the ABAQUS finite element package is presented to predict the influence of transformation strain on the post-weld residual stress field in ferritic steels. The phase transformation subroutine has been outlined in a previous study (PV…
For corroded piping in low temperature systems, such as service water systems in nuclear power plants, replacement of carbon steel pipe with High Density Polyethylene pipe is a cost-effective solution. Polyethylene pipe can be installed at much lower labor costs than carbon steel pipe and High Density Polyethylene pip…
In order to assess the safety against fracture of nuclear shipping casks, drop tests are simulated using the finite element method. The simulations are based on a global model without defects. From the results positions are derived at which a crack initiation from a defect would be most likely. At each of these positi…
The integrity assessment of Reactor Pressure Vessels, mainly based on crack initiation, can be completed by studying crack propagation and arrest. Whereas engineering approaches do not take into account dynamic effects, these effects are important in unstable cleavage crack propagation, arrest and possible propagation…
Engineering mechanics analysis of cannon pressure vessels is described with special emphasis on the work of the late US Army Benet Laboratories engineer David P. Kendall. His work encompassed a broad range of design and analysis of high pressure vessels for use as cannons, including analysis of the limiting yield pres…