Abstract:Recent advance of resin-based composites with high thermal conductivity is reviewed through three sections: mechanism and model of thermal conductivity, materials classification and the influencing factors. According to the type of fillers, metal fillers, ceramic fillers, carbon fillers and hybrid fillers reinforced resin-based composites are listed respectively. In addition, the effects of matrix, fillers, interface and fabrication method on the thermal conductivity of composites are discussed. Finally, we look to the bright future of high thermal conductive resin-based composites.

Abstract:Continuous carbon fiber reinforced polymer composites is a key structural material in the area of aerospace and aviation. To add nano materials with excellent properties into composites could upgrade the mechanical performance of the materials. This report introduces the recent development of fabrication method of carbon nanotube-carbon fiber multiscale reinforcement, such as chemical vapor deposition, chemical grafting and electrophoretic deposition. The effect of carbon nanotube on the interface of the composites is also presented. In conclusion, electrophoretic deposition would be a cost-effective, efficient and mass productive method in the preparation of carbon nanotube-carbon fiber multiscale reinforcement.

Abstract:This paper introduced a means of ablation/ temperature-field predictions in novel modified fiber reinforced phenolic resin. The organic fibre is equivalent to phenolic resin in the novel method of ablation/ temperaturefield predictions. It is shown that the organic fibre is similar with phenolic resin in thermophysical properties,and it also can be treated as resins during thermal analyses. Therefore,the ablation/ temperature-field predictions of organicfiber- based composite materials is achieved by utilizing the existing design strategies for resin-based ablative materials. Test results and application analysis support this method.

Abstract:To calculate reflectance of anisotropic composite laminates reinforced with magnetic coating carbon fibers, is the basis of the study on absorbing properties of the structural absorbing materials. Propagation constant and wave impedance of electromagnetic wave in unidirectional anisotropic composite laminates is derived, and reflectance performance of multidirectional anisotropic composite laminates is then derived using transfer matrix method. According to the above derived methods, a kind of reflectance optimization software is developed for multidirectional anisotropic composite laminates with variable parameters such as directions, frequencies, laminate layers, thickness and etc.

Abstract:The effect of gap ratio on elastic properties of plain weave fabric( PWF) and laminate with triaxial weave fabric(TWF) and PWF composites was numerically investigated by FEA method. Firstly, based on geometry construction and basic parameters of PWF composites, the relationship was determined between both surface density and length of representative unit cell and gap ratio. Secondly, the tension, compression and tear model of PWF composites are established to study the effect of gap ratio on elastic properties of PWF composites. Finally, the effect of the gap ratio on the laminate with PWF and TWF composites was investigated. It is found that the specific stiffness of tension and compression increase with the increasing of gap ratio, and the specific stiffness of tear increases with the increasing of gap ratio. The polarity of polar curve of equivalent stiffness of laminate with PWF and TWF composites decreases with the increasing of gap ratio of PWF composites.

Abstract:Composite lay-up and three dimensional finite element model of composite stiffened panel are created using the “laminate modeler” module based on manufacture process. A method for nodes merging of solid element and shell element is introduced. Finite element meshes of the stiffened panel are created with different relative node interval. The convergence of the finite element analysis is verified according to the criterion of maximum Von Mises stress of the panel. The value of 1/72 as a reasonable relative node interval of stiffened panel modeling is obtained. Stress analysis shows that the initial damage of composite stiffened panel under concentrated load occurs in the No. eight layer. The damage mode is matrix crack in the direction of second material axis. The ultimate load of initial damage for the stiffened panel is 75 N. Stress concentration area is small and it’ s distributed in the domain around the loading point. The efficiency of composite stiffened panel under concentrated load is fairly low.

Abstract:The thermal-environment characteristics of high temperature and supersonic flow field are analyzed by combining CFD method with engineering method. The inside and outside flow field parameters of nozzle are calculated, and the field structure is analyzed, which is compared with test picture. Also, the heat flux and pressure of cone stagnation are calculated and compared with test data. Finally, the relationship among flow field structure, heat flux and pressure is analyzed

Abstract:This paper adopts the FEM simulation software of ABAQUS to establish the drilling simulation models
of annular workpiece unit with staggered teeth BTA drill. Taking 45鄄steel as the workpiece material, cutting the differ鄄
ent diameter annular workpiece with each cutting tooth of staggered teeth BTA drill has been simulated based on the
model. The chip formation process and deformation characteristics of each cutting tooth of staggered teeth BTA drill
are analyzed. The distribution laws of the three components of cutting force with the radius of annular workpiece unit
are studied. The results show that the cutting force components of each cutting tooth of staggered teeth BTA drill pres鄄
ents the non鄄uniform distribution law which is increasing with the radius increases. Besides, the cutting speed and
feed rate have negligible impact on the cutting force distribution.

Abstract:Ultrasound鄄modulated electric machining system is analyzed through the method of dynamic analysis
and then the dynamic properties of the vibrating tool with and without the load or not is discussed. Numerical simula鄄
tion results are compared with the theoretical calculated value, the results show that the higher precision could be ob鄄
tained while using the method of finite element analysis in the area of ultrasonic specialty. The rationality of the opti鄄
mization design for this system is verified by using the method of ANSYS parametric optimization design and optimizing
the ultrasonic vibration system and the system processing test; the technical advantages of ultrasound鄄modulated elec鄄
trolytic machining in difficult鄄to鄄process materials and special鄄shaped surface processing are proved through micro鄄
structure ultrasonic compound electrolytic machining tests.

Abstract:To meet the requirements of satellite components, the BA204 epoxy resin which can be cured by aromatic amine was studied. The mechanical properties of M40J/ BA204 composite which manufactured by winding without solvent and winding with solvent were studied. Vacuum outgassing of M40J/ BA204 composites were studied, and properties of M40J/ BA204 composite tube in simulated space environment where the temperature changed alternately were also studied. Results show that the composites prepared by the above two methods could both meet the requirements of satellite components. The mechanical properties of composites manufactured by winding without solvent were better than winding with solvent. The total mass loss(TML) of M40J/ BA204 composite which manufactured by winding without solvent is 0. 23% and the collected volatile condensed material( CVCM) is 0. 009%. The mechanical property of pipe composite is almost constant after 200 times of thermo-cycling, which indicates the M40J/ BA204 composite has good thermal stability.

Abstract:The microstructure and mechanical properties of a Mg, Ag and Zn micro鄄alloyed Al-3. 48Cu-1. 44Li
(wt%) alloy treated by T8I6 secondary aging were investigated by means of normal mechanical property test, scanning e鄄
lectron microscope(SEM) and transmission electron microscope(TEM). The results showed that, the strength of secondary
aging alloy is improved and the elongation is slightly lowered compared with single aging alloy; the strength increased fur鄄
ther with the third stage aging prolonging. The strengthening phases of the experimental alloy are mainly T1 precipitates with
minor 兹忆and S忆precipitates. The UTS, YS and elongation of the optimum alloy are 613.7, 564.9 MPa and 6.8%, respec鄄
tively. The secondary aging promoted the formation of aging precipitates, especially T1 precipitates,which improved the
strength. Meanwhile, the elongation of the alloy with T8I6 secondary aging is almost not lowered.

Abstract:C/ C-PAA and C/ C-FA composites were prepared by PIP process,X-ray diffraction of PAA and FA
resin carbon,impregnation result of PAA and FA resin,flexural strength of C/ C-PAA and C/ C-FA were studied. It is
show that PAA resin carbon has better initial structure and impregnation result than FA resin carbon;flexural strength
of C/ C-PAA is 34. 9% higher than that of C/ C-FA,flexuural modulus contrast is not obvious.

Abstract:T300 carbon fiber reinforced silicon carbide matrix (Cf / SiC) minicomposites were prepared by pre鄄
cursor infiltration and pyrolysis, using the different thickness of the pyrolysis carbon on the carbon fiber. The proper鄄
ties of Cf / SiC composites were tested and compared. The microscopy structure was characterized by SEM and Raman
sheet. The results show that the composites have crack deflection, and the layer phenomenon on the composites忆inter鄄
face is more obvious after the high temperature treatment. Mechanical test results show that the tensile strength of the
composites increases as the PyC thickness increases initially and decreases afterwards (the thickness of with the pyrol鄄
ysis carbon is between 0 to 150 nm). The maximum tensile strength is 1 385. 7 MPa when the pyrolysised carbon
thickness is 60 nm.

Abstract:In order to meet the needs of new flight vehicles in future, the ceramic fiber rigid insulation titles
were heat鄄treated at 1 200益for 30 min, and the mass loss, the linear shrinkage rate along xy and z directions, the
thermal insulation performance and the microstructure of it were investigated. The results indicate that the variations of
that performance are very small except the linear shrinkage rate along z direction (3. 19%). Comprehensively consid鄄
ering all performance of the rigid insulation titles, the reusability of it can reach up to 20 times.

Abstract:In this paper L9(34) orthogonal experiment design was performed to investigate the effects of the vol鄄
ume change in the insulation sewing process. The results of the experiment show that thickness and density of thread
are the factor which play the most important role. An improved adaptive controlling method based on setting space be鄄
tween thread was proposed to control the deformation of curve flexible insulation.

Abstract:The traditional conditional radiography testing, which is the main testing technology of welding seam,
can not gain the size and position in the welding seam height. Therefore the disadvantage increases the workload of e鄄
liminating flaw and affects repairing welding quality. The phased array ultrasonic technology can detect flaw size and
position by flaw echo wave. The positioning technology of reference test pieces and aluminum alloy melting welding
seam is studied by the Ominsacn MX phased array ultrasonic and 5L64-A2 detector. The research result, microscopic
measurement and macroscopic measurement are contrasted. The result shows that measurement of phased array ultra鄄
sonic, microscopic and macroscopic is uniform, thus the phased array ultrasonic can be used to detect the flaw posi鄄
tion of aluminum alloy melting welding seam

Abstract:PTFE pipe leaked oil after many times used. Based on macro and microscopic observation of facture sur鄄
face by OM and SEM, the fracture failure of pipe was investigated. Accoding to the analysis results of the pipe , the main
reason of leak failure was that the pipe inner surface had manufactural defect. During many times used procesee, under the
high oil pressure, the manufactural defect expanded through fatigue cracking until some area leak oil.

Abstract:According to examples of failure analysis, a new method of renovating used imported integrated cir鄄
cuit was found that comprises rewelding the outer leads of the used one as a “new冶one after simple surface treatment,
by utilizing SEM, EDS and metallographic analysis. It is pointed that such failure mode is always found during the us鄄
age and has characteristic in batch which has the very seriously potential damage. It is considered that the process of
domestication of imported integrated circuit should be accelerated while the purchase channels and quality require鄄
ments should be strengthened in order to further improve the quality and reliability of aerospace products.

Abstract:This paper presents a new special technics for deep and blind square鄄hole machining on carbon fiber
reinforced plastics( CFRP) composite. Through contrasts between different experiments and considering grinding
force, machining quality, tool wear and machining efficiency, the results indicate that the means of first drilling and
then grinding is fit for the machining of square鄄hole. This paper also implements technics optimization according to the
problems occurred during experiment. The problem of deep and blind square鄄hole machining on CFRP is preliminary
solved

Abstract:Microstructure and fatigue fracture characteristics are analyzed of gas tungsten arc welded TA15 tita鄄
nium alloy joints, and the quantitative relationship between pore defects and fatigue life is obtained. The results show
that the fatigue crack initiates from the subsurface or internal pores. When the pore size is small, the fracture will ap鄄
pear "fish鄄eye" morphology. Influence of pore size on fatigue life is particularly significant at a low level stress. Fa鄄
tigue life can be predicted through pore size at a given stress level, having important engineering significance for the
fatigue life prediction and assessment of welding quality