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These processes, associated with high temperatures of propellant gases, as well as phenomena such as friction, diffusion, and chemical reactions, are multifaceted and can lead to a significant deterioration in the mechanical and physical properties of the barrel material [1,2].
Long-term research has identified key factors significantly affecting barrel longevity [10,11].
The second most important factor is the properties of the material from which the barrel is made and its construction.
It also minimizes the heat-affected zone, preserving material properties.
This, in turn, can cause alterations in mechanical and physical properties, potentially resulting in localized melting of the barrel material.

Research on Magnetization Mechanism of Nano-Magnetic Fluid Jianling LI, Decai LI School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China Keywords: Magnetic Particles, Magnetic Properties, Magnetization Mechanism, Nano-Magnetic Fluid Abstract In this paper, we first analyzed the nano-magnetic fluid composition and properties.
Analysis 2.1 The magnetic characteristics of nano-magnetic fluid Magnetic properties of nano-magnetic fluid is the most important and distinctive physical properties.
Therefore, if we adopt different measures to intervene in this process, you can effectively control the crystal growth process, we need to get the crystal. 3.2 Fe3O4 particle size effect on magnetic properties The size of Fe3O4 particle size affects not only the stability of magnetic fluids, but also affect its magnetic properties [7].
Iron oxide magnetic particles and the formation mechanism of influencing factors.
Affect the magnetic properties of Fe3O4 magnetic fluid element.

Common positioning systems based on permanent magnet linear synchronous motor (PMLSM) normally use mechanical bearings.
Invariably, the servo performance is affected by the friction, elastic deformation; vibration and dust result from the actions of the motor with mechanical bearings.
The focus of this paper is to study the forces and theoretical properties of the device, set up its state equation and design a nonlinear controller capable of set-point stabilization.
Then, for a prespecified , the stabilizing controller is found to satisfy the inequality as follows （18） where (19) Furthermore, for the augmented plant Gs defined in (15), coprime factors of can be found by (20) (21) where Fig7.
Weights are selected by the characteristics that we1 play a major role in the low frequency and affect the tracking performance of closed-loop system; We2 reflect the affects intensity of disturbances; wu reflect the affects intensity of control signal.

The properties of individual grains affect the mechanical behaviors and response of materials in micro-scaled deformation, viz., microforming, and there are unknown phenomena and deformation behaviors existing and limiting the wide application of microforming due to size effect.
However, the properties of grain boundaries are not well known but many atomic simulations revealed the grain boundary regions are mostly amorphous [4, 5].
Numerical methods have been widely applied to investigate the mechanical properties of material in serve plastic deformation and microforming process.
is the Schmid factor of the active slip system.
Cases with the same grain size have the same grain properties including grain distribution and grain orientations.

According to the mechanical characteristics of the SRHPC members, the structural section can be divided into different zones, and the element suitable for each zone is determined.
Introduction Steel reinforced high performance concrete (SRHPC) structure is one mainly form of steel-concrete composite structure, as a mature numerical calculation method, finite element method is powerful and common analysis tool for studying SRHPC structure mechanical property.This paper will combine with the charactors of ANSYS10.0 software to explain the theory and technology problems met in nonlinear finite element analysis for SRHPC structure.
The constraints degree of low constraints zone is influenced by other factors, for example layout of vertical bars, section forms of members and load types.
This method can save calculation time without affecting the calculation premise and make the finite simulation realized successful.
At present, ANSYS10.0 software can not reflect the property of concrete passive lateral pressure effect yet, so the mechanics property differences of core concrete in zone constrained by steel and hoop and cover concrete should be reflected by corresponding stress-strain relation.

However, titanium alloys are susceptible to stress corrosion cracking in certain aggressive environments, in particular methanol, resulting in considerable decrease in quasi-static tensile and fatigue properties [2, 3].
The presence of sharp corners and notches in structural design further aggravates the loss in mechanical properties of titanium alloys in such aggressive environments.
Additionally, notched tensile specimens by introducing V-notch with a root radius of 0.025 mm in the gage section (stress concentration factor, Kt = 18.65) were also subjected to fatigue testing in air and NaCl environments.
Fractography of samples exemplified the extent of microstructural damage and it was found that irrespective of the environment and the imposed stress concentration factor Kt, specimens failed revealing three distinct zones namely crack initiation, propagation stage and final fracture (Figs.2a, b, c).
Crack initiation occurred at one of the corners of the gage portion, where methanol affected corroded deposits were seen (Fig.4b).

In this study, the effects of laser parameters on the properties of glazed die steel were investigated.
Scanning Electron Microscopy (SEM) micrographs and micro-hardness properties of the affected surface were measured.
Micro-hardness properties of the affected surface were measured using Leitz mini-load tester with 981 mN force.
Physical and thermal properties of the H13 die steel used for the modelling are given in Table 2.
Table 2: Thermal and physical properties of H13 steels at room temperature [23].

In this paper, water-control and its influencing factors in deep excavation were researched from sealing, draining and dewatering, and then fault tree of waterproofing was set up.
In this paper fuzzy fault tree[4-6] was used to analyze water control and its influencing factors of deep excavation.
The result show that X2, X7, X8 have a strong influence on the top event, and these 3 factors are easier to be decreased than others.
Conclusions Due to the impact of other factors and the limitation of experts, there are some uncertainties in events.
Fault tree analysis of mechanical systems[J].

The equations suggested in this study are a function of material and cross-sectional properties.
Table 1 shows a material properties used in this study [1].
However, C2, C3 are still unknowns and must be found with respect to the mechanical properties of the material and the boundary conditions at the unloaded edges of plate.
Therefore, the general form of equation, such as Eq. 3, needs to be suggested including the factor affecting the restraining effect such as a width ratio for the case of FRP structural shapes.
Conclusions In this study, buckling analysis of isolated plate component of pultruded structural member was conducted for various mechanical properties of the material using the closed-form and energy method solutions.

Anisotropic grain boundary properties are used in the simulations.
The thermo-mechanical properties of materials are dependent on the anisotropy in the materials introduced due to the anisotropy in the orientation of the grains comprising the microstructure.
One of these factors responsible for the recrystallized texture is the recrystallizing temperature.
Grain Boundary properties.
Figure 1 shows the grain boundary properties used in these set of simulations.