Materials Literature
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Abstract This is a continuation of the researches that we started in [Kanem], wherewe had rendered visible, appealing to the minimum raw material of (elemen-tary) mathematics, why the pentagonal form is prevailing in living organisms,and veri ed whether the golden ratio had been used in colossal constructionssuch as t…
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A numerical simulation based on FEM is undertaken in order to clarify the influence of the axial impact velocity V_0 on the crushing behaviour of cylindrical tubes subjected to an axial impact. In general, the initial peak load P_1 for a tube of a strain rate sensitive material is higher than that of a stain rate inse…
The fatigue behavior of prestrained type 304 stainless steel was studied. Rotating bending fatigue tests have been conducted in laboratory air and in 3%NaCl solution using specimens subjected to the tensile-prestrains of 15%, 30% and 60%. A particular attention was paid to the stress-induced martensite transformation…
This paper discusses the influence of irreversible hydrogen and low temperature annealing on the fatigue strength in a cold drawn high strength steel. Fatigue tests were conducted for as-received and annealed samples. Samples were cathodically hydrogen charged, and internal hydrogen states were changed as follows: (a)…
A polymerase chain reaction-restriction fragment length polymorphism(RFLP-PCR) technique was developed for detection of benzimidazole(BZ) resistance at codon 200 of β-tubulin isotype 1 gene of Haemonchus contortus.Sixty-four H.contortus collected from sheep in 4 areas of Ningxia Hui Autonomous Region and Inner Mongoli…
In order to clarify the loading frequency effect on fatigue crack growth rate in hydrogen gas environment, fatigue crack growth tests were carried out on a 6061-T6 aluminum alloy at several loading frequency levels in a pure dry hydrogen gas, in air and in a pure dry nitrogen gas. Hydrogen enhances the fatigue crack g…
A silica-filled EPDM composite (SCT) was exposed to hydrogen gas at P_H≤10MPa, and the critical hydrogen pressure at crack initiation P_ was evaluated. From observations of cracks by an optical microscope, P_ ranged from 4 to 5MPa. It was inferred that these cracks initiated due to the stress concentration of the micr…
Several atomic level problems such as uneven oxidation film or generation of lattice defects take place in the fabrication processes of nano-meter order devices. Among them, dislocation accumulation is a serious problem. Generation and accumulation of dislocations are known to take place during the cooling processes o…
Transportbehalter fur radioaktive Stoffe mit einer Typ-B-Versandstuckzulassung mussen auch bei schweren Unfallbeanspruchungen sicherstellen, dass das radioaktive Inventar sicher umschlossen, eine unterkritische Anordnung gewahrleistet und ionisierende Strahlung ausreichend abgeschirmt ist. Bei der Bewertung von Transp…
Recently, life cycle assessment (LCA) has been attracted attention in the manufacturing fields. Some consumption devices have been designed considering LCA. However, there have hardly been the reports about the machine tools considering LCA. Then, we attempt to estimate the environmental impact on the desktop size fiv…
The main field of electron-beam radiation processing applications is the modification of polymeric material. Polymer development includes new pathways to produce natural polymers with better mechanical and barrier properties and thermal stability. The aim of this paper was to investigate the behavior of a gelatin/acry…
Magnetic refrigeration is a potentially environmentally-friendly alternative to vapour compression technology that is presented in this paper. The magnetocaloric effect in two magnetocaloric compounds in the La(Fe,Co,Si)13 series is presented in terms of their adiabatic temperature change and the specific heat as a fu…
The Plant Life Management (PLiM) project at the Paul Scherrer Institute (PSI) is dedicated to the analysis of thermo-hydraulic mixing phenomena and to the analysis of crack initiation and growth due to the resulting cyclic thermal shocks on the inner wall of the piping. The project, which includes both experimental in…
Cyclic deformation is applied on an amorphous nano-block of cis-1,4 polybutadiene (PB), which has 1000 random coil chains and the average length of [-CH_2-CH=CH-CH_2-]^<75>, by molecular dynamics simulation. As same as the previous polyethylene (PE) simulation, the bond stretch (BS) and van der Waals (VDW) dominate th…
The critical volume at which liquid droplets start to slide on an inclined plate was investigated. The critical volume was theoretically estimated based on the energy minimum condition when the droplets expand on the inclined plate. In order to calculate the system energy, the three-dimensional configuration of drople…
To achieve both high-efficiency power generation and high detoxification performance, advanced-type waste power generation plants, such as pyrolysis and gas reforming plants is suggested. These plants are in need of further surveys regarding their reliability for introduction to waste disposal sites because of a lack…
Recent investigations have confirmed that CN_x (Carbon Nitride) coating showed superlow friction coefficient when it slid against a Si_3N_4 ball in N_2. However, superlow friction was not kept when it lubricated. It was considered that lubricant oil swept the transfer film. To clarify superlow fiction possibility of C…
Experimental studies were carried out to understand the behaviour of 8″ Sch.100 carbon steel (SA 333 Gr.6) notched pipes subjected to pure alternating bending moment using four point bend setup.The procedure as given in A-16 guide of RCC-MR for fatigue crack initiation was used to back calculate a characteristic dista…
The dielectric response of a twisted pair sample was measured by means of Arbitrary Waveform Impedance Spectroscopy (AWIS) during partial discharge (PD) activity caused by exposure to a square bipolar voltage with different rise times and fundamental frequencies. By utilizing the harmonic content of non-sinusoidal vol…