Search results

Recently, NIR have applied extensively to estimate wood properties, wood processing, modification and wood composites[1,2].
The absorption peaks of wood density in NIR region deeply affected by various factors, such as structures, ages, directions or different parts of a tree.
Wood density is a measure of its gross porosity, which has an important influence on mechanical and other physical properties of wood.
The air-dry density of larch samples were measured in accordance with the Chinese standard "Physical and Mechanical Properties of Wood Test Method" (GB1933-1991).
Conclusions The hydrogen groups in wood reflect absorption peak of different characteristics in NIR, which can accurately eatimate the properties of wood.

Yang et al. [5] investigated the effects of material properties on the cold ring rolling process using 3D-FE numerical simulations based on the elastic-plastic dynamic explicit FEM in an ABAQUS environment.
Fig. 3 Finite element simulation model of rim bicycle ring rolling Table 1 shows the simulation parameters of the bicycle rim for the following design factors: Factor A: feet rates of 0.4 mm/s, 0.35 mm/sec, and 0.245 mm/sec; Factor B: rotational speeds of 27 rad/sec, 30rad/sec, 35rad/sec, 45rad/sec, 50rad/sec, and 55rad/sec; Factor C: billet temperature of 20oC; and a friction factor of 0.9.
(2) The feed rate of pressure roll and rotational speed of driving roll both affected the effective stress of forming material.
Ward: International Journal of Mechanical Sciences Vol. 44 (2002), p. 165 [2] K.
Lee: International Journal of Mechanical Sciences Vol. 50 (2008), p. 306 [4] J.L.

Those characteristics are examined with calculated loss factors obtained by measuring resonance frequencies and attenuation characteristics.
The table-1 shows the mechanical property of constituents of the TiNi fiber and the epoxy resin.
Figure 3 indicates that loss factors of the specimens are between 0.01 and 0.1.
The loss factors are not apparently affected by increasing currents where pre-strains are between 0 and 3 %.
(1) The loss factors measured in this experiment are found in the range between 0.01 and 0.1.

Low alloy steels such as ASTM A508 and A533 and their equivalent materials have been extensively applied in fabricating pressure vessels due to their relatively excellent mechanical properties and moderately good weldability.
Fatigue is one of the main degradation mechanisms affecting the pressure vessel integrity of pressurized water reactors and boiling water reactors [1].
Using VAL in practice, the fatigue life is affected by load or cycle sequences.
The number of blocks has also affected the results, which is three for the first set and four for the second set of block loading.
[15] ASM Metals Handbook, Vol.2 - Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM International 10th Ed. (1990)

However, the hole or notch may change the deformation properties of drawing deformation, and cause many possible deformation tendency.
The slab specification and mould parameter are the most critical in many factors that affect the drawing forming force of holed slab, and also the most easily to control during operating.
For experimental sheet CR3, its chemical composition and mechanical property are shown on table 1 and 2, and the test specimen specification is shown on table 3.
Mechanical properties of CR3 Table.3.
China Mechanical Engineering, 2008 (10): 1205~1208

（4）The parameters of discrete element material properties and element stiffness matrix are calculated, the total stiffness matrix is assembled and the displacement of node is calculated
The Lagrangian multiplier is qualified by convolution processing on the sensitivity values with the convolution factors
The updated design variables are convolution processed by the selected convolution factors
Mechanical Engineer,2010,07:45-48[In Chinese]
Chinese Journal of mechanical engineering, 2004，40(12):31-37[In Chinese].

It is well known that nanocrystalline materials have enhanced diffusion properties due to their high grain boundary density which act as fast diffusion channels compared to the lattice.
Introduction In the past fifteen years, nanocrystalline materials developed by severe plastic deformation are of great interest since they show enhanced mechanical properties [1] [2] [3] and especially they show enhanced diffusion properties which allow thermochemical treatments like nitriding to be more efficient on such materials [4].
Many studies have shown that mechanical properties of the nitrided nanocrystalline materials are much enhanced compared to their coarse grain equivalent [4] [5] [6] [7] [8].
Thus, for given mechanical properties after treatment, they present deeper affected depths [4], lower treatment temperatures [4], or reduced nitriding duration [9].
Xue, «Surface nanocrystallization by surface mechanical attrition treatment and its effect on structure and properties of plasma nitrided AISI 321 stainless steel,» Acta Mater., vol. 54, pp. 5599-5605, 2006

The crack initiation was found at the pit along the ridge lines outside the opening area, which was induced by mechanical damage, see Fig.3b.
The micro-hardness around the crack in the shell In order to know the material property around the crack, micro-hardness distribute was measured on the specimen block surface.
Those burns defects would seriously affect the quality and the safety during working.
Pits caused by mechanical injury are also the defects that always be ignored by manufactory, which is one of the important factors affect the fatigue life of accumulator.
(3) The defects as mechanical damage, electric arc flash burn etc. introduced by machining and testing process are one of the important factors that affects the fatigue life of the accumulator.

The material properties used for the metallic hinge bracket are listed in Table 1.
The lamina properties of IM7/8552, listed in Table 2, were calculated using micromechanics formula recommended by Barbero [7] with the fiber and matrix properties obtained from Hexcel [10,11].
Table 1: Mechanical Properties of AA7075-T651 Elastic Modulus (MPa) 71700 Ultimate Tensile Strength (MPa) 572 Yield Strength (MPa) 503 Poisson’s Ratio 0.33 Density (g/cm3) 2.81 Table 2: Mechanical Properties of IM7/8552 Lamina Longitudinal Modulus (MPa) 167480 Transverse Modulus (MPa) 23437 In-plane Poisson’s Ratio 0.34 In-plane Shear Modulus (MPa) 5574 Longitudinal Tensile Strength (MPa) 3441 Longitudinal Compressive Strength (MPa) 5574 Transverse Tensile Strength (MPa) 100 Transverse Compressive Strength (MPa) 288 In-plane Shear Strength (MPa) 121 Density (g/cm3) 1.588 Results and Analysis Preliminary Analysis.
FEA results yield should be similar regardless of the FE software used as long as the problem statement, which consists of the loads and boundary conditions, mesh quality, and material properties, is modeled correctly.
Since the strength of laminated composite structures are determined by the macromechanics such as the laminate stacking sequence, identification of the stress distribution allows the optimization of the macromechanics factors to be performed on the composite structure.

Nano-particles are nowadays used in the production of food packaging, which improves the barrier properties, mechanical properties, that has been confirmed [1-9].
Analytic measures Mechanical property test The mechanical properties including Tensile Sress, Young Modulus, Yield Strength, Maximum Rupture Stress, and Elongation at break, were tested according to standard of ASTM 638.
Results and discussion Mechanical property The effect of nano- SiO2 (NS-2) with different content on mechanical property is showed in table1.
Table 1 Effects of nano-SiO2 on PP’s mechanical property Sample No.
The improvement of printing and laminating performance related to the some factors, example, process condition, and dispersion of nanoparticle as filler that needs to further exploration.