Search results

Thermal cycles and cooling rate gradients affect the microstructural properties of the weld, which is responsible for mechanical performance [10].
This approach applied for enhancing the mechanical properties of assemblies produced by friction stir welding, as demonstrated by some authors [16].
The choice of process factors was done according to the main findings described in literature, which indicate the most influencing parameters on welding properties [29-30].
This plasma interacts with the laser radiation, affecting the energy delivery and process dynamics.
Qu: Effect of simulated welding thermal cycle on microstructure and mechanical properties of X90 pipeline steel Mat.

Moisture is a critical environmental factor that can be damaging the composite properties.
Costa et al [12] indicated that both temperature and moisture can influence the static mechanical properties of composite laminates.
The presence of moisture within polymeric composites often degrades their physical and mechanical properties.
As shown in Fig. 2, both temperature and humidity may affect the static mechanical properties of composite laminates.
Combined with the temperature effects, these factors may cause significant changes in the matrix toughness affecting the laminate strength [12].

The influence of electromagnetic coupling and mechanical coupling on control property in dynamic emulation system is analyzed. the coupled system is a dual-input dual-output system.The load torque changes will cause the variation of speed in the system and the speed changes also affect the variation of load torque.
From the equation(1) it can be concluded that cross-coupled voltage has an effect on speed and other factors.
(6) The transfer function G(s) is presented by: (7) Two separate equivalent control system can be given by the unit matrix method, and the transfer function of the control object is one.The unit matrix method for the asynchronous motor decoupling control schematic diagram is shown in Fig.2 Analysis of coupling characteristics of the mechanical system.The speed regulation and load variation greatly impact on the dynamic loading system. mechanical inertia and friction damping are also the influence factors, therefore mechanical coupling must be considered in the whole system.
The equation(8) and (9) show that the load torque changes will cause the variation of speed in the system, and the speed changes also affect the variation of load torque.
Mechanical Electrical Engineering Technology (In Chinese). 2011,40(1):69-71

School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094) azyj627010@163.com, bxucheng62@163.com Keywords: Weapon, FEM, Thermal Analysis Abstract: Thermal is a important factor that affect weapon firing accuracy and security in the process of weapon fire, so thermal analysis of weapon has important meaning .
Heat is a major factor causes destruction of the weapon barrel bore, at the same time, barrel fever in varying degrees affect the weapons and usability of photoelectric sights.
Consider the impact of temperature on the thermophysical properties of materials and mechanical properties, and get the above parameter values change with temperature by engineering materials manual in the table 1.
The principles are: One, ensure to fully reflect the mechanical properties of the actual structure.
Generalized thermoelasticity of an infinite body with a cylindrical cavity and variable material properties[J].Journal of Thermal Stresses, 2005,28(5):521-532.

Formation of the Surface Layer Properties in Edge Cutting Machining of Stainless and Heat-Resistant Steels Dmitriy V.
Abstract: The article considers features of a cutting process of stainless and heat-resistant steels and factors that determine difficulties in machining these materials.
Though heat-resistant and stainless steels differ from each other, they have a number of common physical and mechanical properties that determine their common technological properties with respect to machinability by cutting.
The worst machinability of these steels and alloys is determined, first of all, by the structure and mechanical characteristics that determine their properties not only in the initial state but also in the hardened state and under heating, as well as by the thermophysical parameters (melting temperature, activation energy and thermal conductivity) that determine properties of material at elevated temperatures.
Thus, the properties of the material machined largely determined the features of the chip-forming process and, consequently, wear of the cutting tool and formation of the quality of the surface machined.

It has good mechanical properties, corrosion resistance, excellent casting properties, at the same time casting performance is good, and it is suitable for aircraft, ships and cars on some of the high demand of complicated castings[4].
The TiB2 particle aggregation and coarsening effect will make it lose nucleation function, therefore, the union of TiB2 particles is a key factor affecting the material properties[10].
Mechanical Properties of Composites.
Tensile mechanical properties of A356 alloy and composite TiB2/A356 are shown in Table 2.
Technological Study onA356 Alloy Mechanical Properties[J].Hunan Nonferrous Metals, 2004, 20(1): 23-25

In order to improve the mechanical properties and thermal fatigue behavior of 4Cr5MoSiV1 steel, traditional process must be changed.
Uniform microstructure can be obtained after homogenizing and then the mechanical properties and the impact toughness value can be ultimately improved.
Metallographic cross-section of ((a) 4Cr5MoSiV1H (b) 4Cr5MoSiV1samples after 2000 cycles test Several factors influence the mechanical and thermal fatigue properties.
Strength, toughness and hardness of hot work-tool steel can synthetically affect its thermal fatigue behavior.
Mechanical properties of 4Cr5MoSiV1, 8407s steels.Proceedings of ICETS 2000-ISAM, Beijing, P.R.China, October, 2000, 1275～1280

Achieving a uniform distribution of reinforcement within the matrix is one such challenge, which affects directly on the properties and quality of composite material.
Also the effect of different reinforcement for AMMCs on the mechanical properties is discussed in detail.
It was concluded that type and morphology of CNT reinforcements are significant factors to be considered in preparing CNT–Al nanocomposites during powder metallurgy routes [14].
Naiqin Zhaoa et.al analyzed the effect of mechanical alloying on SiC distribution and the properties of 6061 aluminum composite.
Microstructure and mechanical properties of 6061 Al alloy based composites with SiC nanoparticles were studied by A.J.

However, improvement of mechanical properties is a constant in research activities, either by the development of new alloys or by microstructure manipulation.
Eutectic Si modification is crucial to achieve high mechanical properties, and is considered much more important than grain refinement itself [5].
Basavakumar et al., Influence of grain refinement and modification on microstructure and mechanical properties of Al-7Si and Al-7Si-2.5Cu cast alloys.
García-Hinojosa et al., Structure and properties of Al-7Si-Ni and Al-7Si-Cu cast alloys non-modified and modified with Sr.
Puga et al., Influence of Ultrasonic Melt Treatment on Microstructure and Mechanical Properties of AlSi9Cu3 alloy.

The mechanical properties and microstructure of FW steel joints were observed. 2.
As the range of individual factor was wide, a central composite rotatable Three-factor, five-level factorial design matrix was selected.
The second-order polynomial equation used to represent the response surface HFDZ is given by: HFDZ=b0+ΣbiXi+ΣbiiXi2+ΣbijXiXj (2) And for three factors, the chosen polynomial could be expressed as: HFDZ =b0+b1(F)+b2(D)+b3(N) +b12(FD)+ b13(FN)+b23(DN) +b11(F2)+b22 (D2) + b33 (N2) (3) Where b0 is the average of the responses, and b1, b2, b3… b33 are regression coefficients that depend on the respective linear, interactive, and squared terms of factors.
Characterization of mechanical properties in AISI 1040 parts welded by friction welding [J].
Developing mathematical models to predict tensile properties of PCGT arc welded Tialloy.