Abstract: Material has been changing, and there are unchanged laws about thesechanges. These simple and unchanged laws about the changee of material were realized during Author's past 51 years study on materialogy after graduation from the univeroity and will be discussed in this paper. It is divided into three parts with ten sections. The first part is discussion which consists of 3 sections:one definition on material; two diagrams about the micro- and macro-problems of material; and three methods of reasoning. The second part is discussion which consists of 5 sections:one symbol for property; one equation for structure; four ways to deal with environment; three principles of natural process; and eight methods for energetical analysis. The third part is conclusion which consists of 2 sections. five points of view on things and two methods of reasoning for the generalist. Altogether, in this paper, ten topies are discussed and thirty view points or methods are presented about niaterial, people and thing. "Outlook on thing and Methodology" could be another title of this article.
Abstract: The actions and influenees of non-sinusoidal diagrams on separation of fine grain material were researched emphatically with the autogenous heavy-media jigging equipment. The material was artifical mixed mineral made up of magnetite and quartz of -0.1 mm. The result demonstrated that a non-sinusoidal diagram could get better effect of benefication than the sinusoidal diagram. It was more helpful to form the autogenous dense medium bed.
Abstract: A mathematic model for percussive rock drilling is established by using the theory of stress waves. The model is verified by experiments and used to analyse the stress on the piston and the causes of the piston failure. A criterion of piston material selecting is put forward.
Abstract: A program SOP for large complex frame structural discrete optimization, based on SAP5P program, is designed by applying the optimum criterion method and including the characteristica in mechanical structure, and the optinnzation analysis of a frame structure is completed.
Abstract: It is found that the transverse corner cracks occurring on the medium cabon hypo-peritectic steel CC slabs produced by BAOSHAN STEEL are type of inter-γ granular fractures occurring mainly at temperature below 850℃. Hot ductility measurement of three medium carbon steels indicates that, under the strain rate of 4×10-3/s, there exist two fow ductility temperature regions for the tested steels within the temperture range from steel melting points to 700℃, i.e. Region I from the melting points to 1350℃ and Region Ⅲ from 850℃ to 750℃. In Reginn Ⅲ, the ductility loss is mainly resulted from the precipitations of nitrudes of Al, Nb, etc. at the austenite boundaries in single γ phase tempeniture range and the formation of the film-like proeutectoid ferrites along the γgrain boundaries in γ+α two-phase temperature range. By taking measures of precisely controlling steel N, Al concentrations and adopting mild secondary cooling pattem to raise the slab unbending temperature out off the low ductility Region Ⅲ, the occurrence of the transverse corner cracks on medium carbon hypoperiteetic steel CC slabs has been significantly reduced.
Abstract: The influence of carbon content, temperature, time, particle size and from of samples on the reduction of SiO2 by carbon in zircon were studied. The effects of these factors on the ratio of desilica from zircon were obtained. The maximum value of this ratio could reach to 97.22% theoritically. The apparent activation energy for the reaction of zircon with carbon was 282.04 kJ/mol (1600~2000℃).Besides, the limiting step of reduction of SiO2 in zircon was the heat decomposition of zircon, not the reaction of SiO2 with carbon after decompostion of zircon.
Abstract: Based on the experimental data, a melting mathemiatical model for simulating the unsteady one-dimensional moving boundary has been set up. The calculated melting rate of scrap was consistent with experimental value.
Abstract: Investigates the effects of the P type, S type and S-P type lubricant additives on friction, wear and scuffing resistance of base materials with and without TiN and TiC coatings. SEM and AES were used to analyze the surface texture and the mechanism of friction on the samples was discussed.
Abstract: First analyze the source of fluid-borne vibration and noise as well as the fluid acoustic powers in hydraulic power systems. Then, a newly devieed "2 pressures/2 systems" method is presented to measure the fluid-borne vibratio characteristics (flow ripple and source impedance) of pumps. With this method, not only the hydraulic test circuit and calculation procedure become very simple compared to the former methods but also the tests can be performed very quickly. At last, a hydraulic simulation package is developed to simulate and analyze the pressure pulsations in any hydraulic pipelines generated by fluid power pumps. The experiments shows that the calculated results obtained by the present simulation package agree with the experimental results with sufficient accuracy for practical use.
Abstract: The dynamic adjustment problems of production logistics of Heat-Heat Mixing Charge (mixing CC-DHCR with CC-HCR) and Cold-Heat Mixing Charge (mixing CC-DHCR with CC-CCR)are researched. On the basis of dynamic models of characteric value of inventory buffering, dynamic adjustment mathematical models of production logistics are posed according to production situation of mixing charge.
Abstract: Two-dimension eddy current inspection model is taken for researching the effect of the eddy current transducer structure parameter upon the inspection sensitivity. Dual-frequency eddy current inspection is applied to the inspection of slab surface defects. The results of experiment prove that the change of sensor impedance due to the change of crack depth causes the phase angle of impedance to change.
Abstract: A expert system bases on fuzzy logic and neural network is proposed. It is a new solving strategy which incorporates a system of representation of knowledge, generating and solving. The representation of knowledge in the system is distributive. The knowledge inference is going on in parallelism and completed without searching continuely for the knowledge base and matching.
Abstract: Because of the difference of simulation method and theoretical analysis measure, the analysis results of control algorithms, which pulished on references, are incomparable. In order to eliminate the "incomparability", a general quantitative criterion for the analysis of robustness of control algorithms is presented, and the robustnesses of two kinds of Model Algorithmic Control (MAC) algorithms-Basic MAC and Incremental MAC are analyzed by this way. The results show that the quantitative criterion is compatible with the results of their simulations and real-time applications, and it is suitable for the theoretical research of most of control algorithms.
Abstract: A new model for predicting interaction coefficients has been proposed by using of free volume theory, Miedema's semi-empirical formular and Toop's geometrical model. The results calculated are well in agreement with experimental values except for N and H gas elements.
Abstract: Balling and reducing experiments of carbon-bearing chromite powder were carried out in laboratory. The effect of grain size of raw materials, amount of binder and carbon and other factors on the green pellet properties and the influence of reducing temperature and time on the metallization rate of carbon bearing chromite pellet were investigated. The results shown that the metallization rate of carbon-bearing chromite pellet of up to 90% under the reducing temperature of 1350℃, reducing time of 15 minutes, the amount of carbon exceed the the theoretical carbon requirement by 20%. By using heating reflux method and 1:3 H2SO4, the chemical analysing of metallic Cr and Fe becomes easier.
Abstract: By thermal cycling treatment from 1200℃ to room temperature, a considerable acceleration of Cr diffusion to grain boundaries in Fe25Cr5Al alloy occurred due to nonequilibrium Cr element segregation, and resulted in the precipitation of Cr-rich α'-phase at grain boundaries and within grains; micrometer scale of α'-phase was observed at the grain boundary, the phase transformation resulted in the failure of the alloy by a mode of transgranular deavage fracture.
Abstract: According to classification standard of corrosivity categories of atmospheres (ISO9223) and the corrosion data obtained from the testing stations of atmospheric corrosion in China, the ways of corrosivity categories of atmospheres in China are put out and the final results of the atmospheric corrosivity of typical areas in China are obtained.
Abstract: The influence of static electric field on the properties of phase transformation and shape memory effect in CuZnAl SMA has been studied by applying static electric field to the alloy during aging. It is found that static electric field slightly decreases transformation temperatures, and it increases the amount of martensite and shape recovery rate of the alloy.
Abstract: Cyclic load-deformation curves of materials under tension-compression cycle and torsion cycle for different strain ratio were determined experimentally by using incremental step loading and total strain controlling technique in room temperature. Cyclic stress and stress ratio were obtained as functions of strain ratio.
Monthly, started in 1955 Supervising institution：Ministry of Education Sponsoring Institution：University of Science and Technology Beijing Editorial office：Editorial Department of Chinese Journal of Engineering Publisher：Science Press Chairperson：Ren-shu Yang Editor-in-Chief：Ai-xiang Wu ISSN 2095-9389CN 2095-9389
