Table of Content

28 July 2008, Volume 0 Issue 4

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BASIC STUDY

AN OPTIMUM DESIGN OF PLY ORIENTATION ANGLES FOR THE NATURAL FREQUENCIES OF COMPOSITE PLATES BASED ON RANDOM CHANCES CONSTRAINT

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2008, 198(4):  3-6. 

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Study on optimum design of ply orientation angles for natural frequencies of composite plates with random elastic constant.From the rigid matrix of monolayer plate,provides the rigid features of laminated composite plate as well as certain model with first intrinsic frequency.According to random chance constrained theory put forward by Liu,the chance constrained programming model about Maximax and Minimax of first intrinsic frequency is provided.On the basis of experiment and that random theory hypothesis elastic constant obey the experience distribution,the bringing out of experience distribution random datum of elastic constant datum as well as the algorithm dealing with random chance constrained is provided.Then the solution method of genetic algorithm based on random analogy is given.Finally,a specific living instance or the state that composite rectangle plate first optimization supported by four sides testifying the validity of the solution method of genetic algorithm based on ra...

COMPOSITE MATERIAL BOLT THREADED NUT CONTACT FINITE ELEMENT ANALYSIS

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2008, 198(4):  7-11. 

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By means of large-scale analysis software ANSYS,a finite element model of elastic plastic axial symmetry contact problem is established which remained with the nonlinear surface and the nonlinear materials for the connecting of composite material bolt threaded nut.Stress-strain field has been calculated under the axial load with gap coordination of the composite material bolt threaded nut.The results indicate that,the joint of the composite material bolt threaded nut can satisfy the intensity and the rigidity request for the coal mine safety production.The researches in the paper have provided theoretical basis for the design of connecting the composite material bolt thread nut,and have important significance for widely using of the composite material bolt thread nut in project.

A SYSTEMS ENGINEERING PERSPECTIVE ON MOLECULAR DESIGN OF RESIN MATRIX BASED ON GROUP CONTRIBUTION METHOD

Ou, Y. N.

2008, 198(4):  12-13. 

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As an attempt to advance a potentional efficient alternative,or at least,useful complement to the traditional method of resin matrix research and development,in this paper,is outlined,from systems engineering's point of view,a framework for computer aided molecular design of resin matrix based on group contribution method.

REVIEW

THE BASIC PROPERTIES OF LOW VISCOSITY EPOXY RESIN CURED AT MEDIUM TEMPERATURE

Lv, J. Y., Wang, L., Chai, H. M., Li, P., Xue, Z. M.

2008, 198(4):  16-18. 

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A low viscosity epoxy resin should be used in RTM,casting and filling.The system is prepared by modifying Bisphenol A epoxy.The viscosity,mechanical properties as well as thermal stability are characterized,which show that the prepared epoxy has long pot life at normal temperature.After cured at medium temperature,the mechanical properties and thermal stability are good.

MATERIAL RESEARCH

EW PROGRESS IN SURFACE MODIFICATION OF PBO FIBER

Su, W., Huang, Y., Wu, D. W.

2008, 198(4):  19-21. 

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This paper introduced the structure and function of the Poly-p-phenylene benzobisthoxazole(PBO)fiber,reviewed the research progress in surface modification technologies of PBO fiber including the acid treatment,treatment with coupling agent,plasma treatment and radiation treatment etc.

THE NEW STRUCTURE OF HOLLOW INTEGRATED SANDWICH COMPOSITES WHEN BE UTILIZED FOR ROUTING

Liu, J., Qian, K., Cao, H. J.

2008, 198(4):  22-24. 

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This paper designed a new three-dimensional structure of the textile composite materials-hollow integrated sandwich composites,tested the tension,press and low velocity impact properties of the material.The results show that,this structural composite material can fully satisfy some special engineering requirements,will be a good substitute for present material.

DAMAGE ANALYSIS ON HIGH PERFORMANCE FIBER DURING PREFORM FABRICATION PROCESS

Liu, X. M., Wang, C., Jiang, J. H., Chen, N. L., Feng, X. W.

2008, 198(4):  25-29. 

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In this paper,the damage process of high performance fibers under tensile,bending and abrasive actions is evaluated.Acoustic emission technology was used to represent the fiber breakage history.Combine the data of the AE signals,the tensile strength curve and the SEM photos,the mechanisms of filament breakage were given.

EQUIPMENT PROCESS

STUDY AND APPLICATION OF COMBINED INORGANIC COMPOSITE VENTILATION DUCTS MOULD

Xu, B. B.

2008, 198(4):  30-32. 

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Based on years' production experience and research,this paper introduces fabrication technology points of composite ventilation ducts mould(such as wood model treatment,mould paste and surface treatment),provides reference for manufacturing high-quality glass steel products.

DESIGN RESEARCH OF GLASS FIBRE REINFORCED PLASTICS BOLTS

Huang, Z. F., Li, G. W.

2008, 198(4):  36-40. 

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Rock bolting is a support widely used in slope engineering,tunnel and large cave support,as well as reinforcement of building structure.As the main part of support structure,the anchor-rod must have enough reliability and durability.However,it is easily eroded by the environment for steel,so the durability of steel bolt being used commonly should be paid more attention to.The glass fibre reinforced plastics(GFRP) anchor-rod is a new kind reinforcement material which is compounded with resin and glass fibre,having better mechanical property and corrosion resistance.The durability problem of slope engineering can be solved if GFRP anchor took the place of steel bars.The structural design of GFRP anchor-rod includes styles design,inner and outer anchorage segment design,distance between anchor-rods design and so on.Compared with steel anchor-rod,GFRP anchor-rod is strongly sensitive to lateral load and can't directly connect with spanner(like nut).The chucking power of screw thread coupli...更多ng semi-stamping steel cramping apparatus,which is developed spontaneously,is tested in this item.The result shows that: the chucking power of single cramping apparatus can reach 15 tons and that of two parallel cramping apparatuses can reach 35 tons.This is satisfied with the design request for maximum load of anchor-rods.However,the binding power between cramping apparatus and concrete should be smaller than the design strength of anchor-rod.Accordingly,the way of two parallel cramping apparatuses and steel cushion plates used together should be chosen to bolt the outer ending of GFRP anchor-rod.

EXPERIMENTAL STUDY ON THE BOND BETWEEN GFRP BARS AND CONCRETE WITH DIFFERENT POSITION

Zhang, H. X., Zhu, F. Q., Kong, D. D.

2008, 198(4):  41-44. 

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The pullout tests of concrete reinforced with GFRP bars were carried out and test data were analyzed and summed up.Distribution curves of the strains of GFRP rods with loads and at different position were showed,the characteristics of the two types of curve were discussed.Distributions of the bond stress between GFRP bars and concrete and slip at different position were studied.The experimental results show that the bond-stress law of GFRP bars and concrete is obviously different from that of the reinforced concrete because of the self-characteristics of GFRP bars.A good agreement is obtained between the results of slip fitted formula at bond length range and experimental results.