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Introduction 7xxx aluminum alloys are used extensively in aerospace and automotive industries for their high strength and significant natural aging properties [1].
Friction stir welding (FSW) is a new solid phase joining technique using a rotary welding tool to introduce the frictional heat and achieve joining, which has advantages of better mechanical properties, less distortion, and fewer weld defects than conventional fusion welding.
Generally, the resulting FSW joint consists of various zones with different microstructures and properties (for instance, mechanical properties and corrosion resistance) depending on the degree of thermal cycling and plastic deformation suffered during welding.
The SZ is affected by mechanical stirring and welding thermal cycle, and the precipitates were dissolved into the Al matrix (Fig. 5b) .
The main conclusions can be drawn: 1) The results of IGC resistance of the four zone in 7N01-T5 aluminum alloy joint can be sorted in the following order: SZ ≈BM > TMAZ > HAZ. 2) The characteristics of precipitates on grain boundary are the key factors affecting corrosion resistance of the joint.

Further studies will present the results of the effect of alkaline earth metal nitrates on the deformation properties of adhesive joints and on rheokinetic and colloid-chemical properties.
In this paper, the main focus will be on the effect of divalent metal nitrates on the physical and mechanical properties of aluminosilicate adhesives for wood bonding.
Lapovska, Influence of Nitrate Species ANO3 and ANO3×nH2O on Physico-mechanical Properties of the Aluminosilicate Adhesives for Wooden Structures, Solid State Phenomena. 325, (2021), pp. 143-149
Adhesives – Applications and Properties (2016)
Kopylova, Study on physico-mechanical properties of the modified alkaline aluminosilicate adhesive-bonded timber elements, Solid State Phenomena. 296, (2019), pp. 112-117

The factors that affect the fracture toughness of the modifies epoxy such as morphology, particle size and composition are interdependent; hence it is very difficult to study the effect of individual parameter [4].
However, the CB tends to form larger agglomerates and affect the mechanical properties.
Flexural Properties.
This may resulted from higher interaction of CB than epoxy-CB interaction that cause the mobility of epoxy-CB lowers, than affecting in low strength.
As the LNR content increase, the mechanical properties of epoxy studied decrement trends.

By the consolidated undrained triaxial sherar test of Yingkou clay, obtaining that stress-strain relationship is strain hardening under different confining pressures.A kind of cementation structure in the soil directly affects soft soil strength.And the paper contrast four kinds of normalized factors to study stress-strain characteristics,which are confining pressure, the average consolidation pressure, and the ultimate value of principal stress.The results indicate that the normalized degree is more accurate when used value of principal stress and as normalized factor.
Introduction The soil has very complicated Mechanical properties in the process of geological structure and the evolution,which under different stress path and the stress history.Meanwhile it has regional characteristics.The clay with high water content and compressibility easily lead to the rheology.So the stress-strain relationship behavior of clay is often studied by many scholars[1-5], especially for the normalized stress-strain relationship behavior of clay.
Ladd[6] considers confining pressure as normalized factor can well fit stress-strain relationship after K0 consolidated undrained triaxial shear test of clay.LI Zhuoqin[7] systemic analyse the normalized property of cohesive clay,with confining pressure, the average consolidation pressure as normalized factor,which obtained the ideal effect.Zheng Gang[8] etc study the normalized characters of clay through test with different normalized factors.Because the Regional characteristics of clay, which factor can more accurate normalize the clay of Yingkou City.Based on this, by the consolidated undrained triaxial shear test of Yingkou clay,comparative study stress-strain relationship with the confining pressure, the average consolidation pressure, and the ultimate value of principal stress as normalized factors, and deduce a normalized nonlinear elastic equation which can provide theoretical basis for the clay of Yingkou City.
（4） The ultimate value of principal stress is most accurate in four normalized factors.
[7]LI Zhuoqin.Analysis of the normalized property of cohesive clay [J].

Investigation of Hydrogen Embrittlement Effect on Microstructure, Mechanical Properties and Fracture of Low-Carbon Steels Maria-Eleni Mamassia, Dimitra Ioannidoub, Stavros Deligiannisc, Petros E.
It can be defined as the hydrogen-caused deterioration of the mechanical properties of most metallic materials and alloys [10-14].
These accumulations of hydrogen can alter the local mechanical properties of the material, making it easier for plastic deformation to occur in those regions.
HIC encompasses a range of cracking mechanisms that can occur due to the interaction of hydrogen with the material’s microstructure and mechanical properties.
Those values typically reflected its original material properties, including factors like alloy composition, heat treatment and microstructure.

The microstructure in the simulated coarse-grained heat-affected zone was predominantly bainite.
Welding thermal cycle simulation is often used to simulate the welding thermal cycle of coarse-grained heat affected zone (CGHAZ), and thus to analyze the microstructures and mechanical properties, which can provide some technical reference for real welding parameters.
Fig.  9 Vickers hardness curve of real welding joint Table 5 Mechanical properties test results Tensile test Fracture location weld Yield strength [MPa] 895 Impact test [J] Fusion line 200, 184, 165 / 183 Fusion line + 0.5 mm 217, 209, 187 / 204 Fusion line + 2 mm 210,208,205 / 208 Discussion The Zr-Ti microalloyed pipeline steel X120 was designed with ultra-low carbon and high manganese contents.
Pcm is an important factor to influence the weldability of high strength steels, which is significantly affected by the carbon content.
(2) When the Zr-Ti microalloyed pipeline X120 steel plates were welded with the heat input of 21 kJ/cm, the heat-affected zone of the steel plates had high yield strength (895 MPa) and low temperature (-30°C) impact toughness (183 J, 204 J and 208 J in the fusion line, coarse-grained heat-affected zone and fine-grained heat-affected zone, respectively).

Groove Angles Influence on Mechanical and Microstructural Properties of P460N Steel in SMAW Rouhollah Mohsen Pezeshkian1,a,Peyman Shayanfar2,b, Saiedeh Shafaiepour3,c 1Department of Mechanical Engineering, Sazeh Shahin Co.
Isfahan, Iran 2Department of Material Engineering, Najafabad University, Isfahan, Iran 3Azarm Language Institute, Isfahan, Iran amohsen.pezeshkian@gmail.com,bpayman.shayanfar@yahoo.com, cetransteam@gmail.com Keywords: P460N, SMAW, Groove Angle, HAZ, Fine grain steel Abstract This study investigates mechanical and microstructural properties of P460N steel after Shielded Metal Arc Welding (SMAW).
After checking mechanical and microstructural properties of all the specimens, the groove angle of 60° was confirmed to be used at designing and construction of a reservoir with thickness of 14mm and working pressure of 40 bars.
Due to a direct impact of heat transfer on grain size of the base metal, and the direct impact of grain size on the physical and mechanical properties of the base metal, specimens groove angle is so significant.
Yield stress is also an important factor in the design of pressure vessels; using this factor along with other analyses on welded parts of P460N steel allows the complete understanding of the steel behavior after welding with various groove angles [1].

The strength and stiffness of humanoid massage robot arm are the main factors that they affect the dynamic characteristics and positioning accuracy under the action of the load.
The mechanical arm structure in the empirical design stage always is similar design.
Humanoid massage robot arm’s strength and stiffness are the main factors affecting the dynamic characteristics and positioning accuracy under the action of the load. it is an important content of the robot design.
In the premise of Keeping up with the main mechanical characteristics, striving to keep the Movement mechanical properties consistently Grid partition of the key parts .We must set material properties before meshing.
[8] Yanming Shao,Ze Cui: Mechanical design and manufacturing.(2011)No.10,p115-117 (In Chinese).

This article gives a comprehensive discuss from the corrosion mechanism, influencing factors and consequences.
It occupies dominant position among the factors affecting the structural durability.
(1) The mechanical properties of corroded steel The reduction of corroded steel resistance directly influences the service member and structure bearing capacity, when it is serious, it can cause premature failure and even collapse.
Lubrication effect between steel and concrete corrosion layer, transverse rib rust in the steel surface, concrete protective layer’s cracking or peeling can lead to reduction or even complete loss of reinforced concrete bond anchorage properties, ultimately affecting the reinforced concrete bridge’s structural security, applicability and durability.
Research on Influence Factors of concrete carbonation [J].

The research focus on the material of the stainless steel thin conduit in aircraft, named 1Cr18Ni9Ti , and the TIG weld joint of which was investigated to analysis the fatigue properties.
Aero-engine conduit material 1Cr18Ni9Ti belongs to the austenitic stainless steel, it has the characteristics of good corrosion resistance, flexibility, vibration resistance and wide temperature using range, at the same time, this steel has good mechanical properties and oxidation resistance, which is widely used in aircraft hydraulic, fuel, gas conduit system.
For the butt welding of 10×1 mm conduit, the mechanical properties of weld joint is shown in table 1.
Mechanical properties of base metal and weld joint Rp0.2(MPa) Rm(MPa) A(%) Base metal 196 600 66.5 Weld joint 279 567 - Figure 2.
As shown in Fig. 6B, the heat affected zone interface is undulating, from the heat affected zone extends to the fusion line position, showing the organization and the regional stress state is fluctuation.