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Moreover, the experimentally measured results of the normal and discontinuous preform models under bending were compared to examine the safety conditions as functions of fiber content and other factors.
The failure happened at the highest stress concentration, which related to mechanical properties of its composite.
In this phase, the nature of the bond between fibers and matrix of the wrinkled and overlapped regions was thought to be predominantly mechanical bond.
It is clear that the failure modes of the composites with wrinkled and overlapped fabric preform patterns were depending on the discontinuous lengths and affected their flexural properties.
Then, from Eq. 3 and Eq. 4, (5) Therefore, with given material properties and geometries, we can predict the safety of composite products with discontinuous fabric preform.

Carbon fibers combine low weight and exceptional mechanical properties,making them ideal reinforcements forpolymer composite materials.
Research on interface properties.
Interfacial bonding strength will directly affect the mechanical properties of composite materials [2].
In terms of its research methods can be divided into the mechanical analysis and instrument analysis.
Interfacial properties of composite materials is characterized by the critical stress intensity factor (KIC) and the critical energy release rate (GIC).

Has better mechanical properties than the substrate; 3.
It combine the good toughness and processability of metal with the excellent wear resistance, corrosion resistance, high temperature performance and anti-oxidation properties of ceramic materials to obtain more excellent surface properties.
Process Parameters Laser cladding is a complex, dynamic and rapid melting - solidification process, the existing time of the melt pool is short, and the size is small, so selecting an appropriate process parameters has a direct impact on the cladding layer macro-morphology, microstructure, mechanical properties.
The cross section of laser cladding generally consists of cladding layer, transition zone and heat affected zone.
For a long time, crack mechanism, influencing factors and suppression methods were studied.

On the basis of the main parameters affecting hot stamping, four process parameters (factors) were considered: (i) normal pressure, (ii) sheet temperature, (iii) sliding velocity, and (iv) tool surface finishing.
Low level and high level of factors, shown in Table 1, were chosen on the basis of a compromise between process conditions and a preliminary sensitivity analysis.
The levels of factors for pin-on-disk experiments carried out on USIBOR 1500P™.
Factors Low level High level Normal pressure [MPa] 5 25 Temperature [°C] 500 800 Sliding velocity [mm/s] 3 6 Surface condition Turned Polished Results LFT.
Furthermore, with the aim to find a basic explanation of the determined development of the tribological properties, smoothing effects affecting the real contact area between workpiece and sheet as well as the increased ductility of the blanks' bulk material has to be taken into consideration.

The growing use of cast Al-Si alloys necessitates a more profound comprehension of its mechanical properties and the effect of processing factors upon the end product [3].
There is no doubt that the variety of Al-Si hardener phases affect its properties, especially its wear resistance.
Time and temperature parameters of the T6 treatment are very important factors towards controlling the properties of the alloys [15].
Therefore, T6 treatment used to improve the mechanical properties of alloy.
Large eutectic Al2Cu phase decreased the alloy’s mechanical properties [35].

The ability of current materials to withstand these conditions remains a limiting factor and the active-cooling thermal protection system (TPS) is necessary in the combustion chamber.
The structure sustains both mechanical and thermal loads by integrating load-bearing with coolant passages.
The 2-D Finite elements mesh used for calculations is shown in Fig.2, the geometry parameters for FE calculations are listed in Tab.1,the Ni-based alloy Inc X-750 properties are listed in tab.2.
Properties of Inc X-750.
For the given structure weight, some design parameters affecting the thermal-mechanical stress has been studied by altering the model geometric dimensions.

Geological conditions, support patterns and bad construction are considered as the main factors of roadway damage and new support method is given.
This mine area is affected by tectonic movement, with semi-arched by the boring straight wall.
Table 1 shows the selection of mechanical parameters.）
Table 1 The table of mechanical parameters of model No.
Stress Distribution Based on the above analysis we can see that the reasons for the roadway deformation can be attributed to the following aspects: The surrounding rock reflects the weak nature of surrounding rock and has strong expansion properties because of large proportion of muddy.

When an underground cavern goes through the layered rock masses, surrounding rock stability is not only affected by anisotropic mechanical properties of layered rock mass, but also by the intersection angle between stratification plane and cavern axis.
However, when cavern axis intersects the strike of stratification plane with a small angle or both are parallel, anisotropic mechanical properties of layered rock mass influence the cavern stability more.
According to lots of previous experience in physical model tests, similar material also has to meet the following principles [11]: (1) The main mechanical and deformational properties of similar material must resemble those of prototype material; (2) The mechanical and deformational properties of similar material are supposed to stabilize and avoid being affected by external conditions during test procedure; (3) Certain physical and mechanical properties can be adjusted through changing the mixture ratio to adapt to the requirement of similar conditions; (4) Physical models must be made and molded easily and can solidify rapidly, but when it solidifies, there is no big shrink; (5) It’s easy to paste testing elements on the surface of physical models; (6) Model material must be rich in sources and low-cost.
Therefore, the first thing is to find out which are the decisive factors among all of the influencing ones and only then will the similar material be selected.
(3)The stress distributions and failure modes of surrounding rocks of deep-buried layered rock mass are all similar owing to the influences of anisotropic mechanical properties of layered rock mass.

The experimental results show that the content of metastable tetragonal phase of ZrO2 and grinding stress are the primary factors which induce martensitic transformation on ZrO2 ceramics ground surface; during grinding the deeper the grinding depth is, and the bigger abrasive grain size is, the grinding stress in material matrix is larger.
Some studies indicated that phase transformation is also the key factor which affect the residual stress of ground surface[1][2].
Influence of grinding parameters on residual stress of nano-ZrO2 ceramics The residual stress of ceramics surface generated during grinding is the key factor to induce cracks.
Residual stress, acting as a key parameter of surface quality, its value and property affect the strength and reliability of precision ceramic parts greatly[3] [6].
Engineering ceramic materials Processing technology and its application [M].Beijing: Beijing mechanical industry press, 2008 [2] Tian Xinli, Yu Aibing.

Die wear is regarded as a crucial factor which affects die life and quality of products.
Lange and co-workers [5] reported that die lives in high temperature forming processes were affected by wear in over 70% of cases.
Results and Analyses Under the same initial conditions and material properties, the two kinds of die cavities are simulated with the finite element software MARC/Autoforge.
Kim: International Journal of Mechanical Sciences Vol. 43(2001), p. 1507 [2] S.K.
Ma: China Mechanical Engineering Vol. 16(2005), p. 368 [5] J.H.