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The microstructure of welded joints differs significantly from that of the base material, what changes their mechanical properties and influences fatigue life.
This leads to a change of mechanical properties and deformation behavior.
A common approach for the estimation of mechanical properties is the sampling of micro tensile (flat or round) specimens using electro-discharge machining [1].
Fig. 4: Hardness distribution in the heat treated specimen Local mechanical properties For the estimation of the local mechanical properties small samples with the respective bulk microstructure were manufactured from heat-treated work pieces and tested in monotonic tensile tests.
Fig. 5: Local mechanical properties of coarse grained zone estimated using heat treated samples Conclusions In the current work an approach for the determination of the local mechanical properties of welded joints was presented.

Both the porosity content and mechanical properties of A201 aluminum alloy plate casting are governed by the cooling rate.
Of these thermal factors, the cooling rate is influenced by different process variables that affect the feeding behavior of the castings during solidification.
It is accepted by most of the researchers that the faster the cooling rate, the better the mechanical properties of the castings. [4-6] However, the mechanical properties of aluminum alloy casting depends on the microstructure, such as porosity content, DAS, shape and distribution of the second phase. [2, 7-13] The cooling rate will be discussed in this study to find out its influence on the mechanical properties and porosity content.
The porosity content is not the only factor will affect the tensile strength of A201 aluminum alloy casting. 3.
Gruzleski, “Mechanical Properties of A356.0 Alloys Modified with Pure Strontium,” AFS Transactions Vol.82, (1974)453-464

To study the mechanical properties were applied techniques of Charpy Impact Resistance and Uniaxial Tensile Analysis.
So, the fails are generates and commit the mechanical properties.
The statistical results show that these fail conditions don’t affect the tenacity’s properties of the RHA/PP composite.
Conclusions The mechanical properties of the RHA/PP are affected by RHA weight perceptual and by RHA particle size.
So, with the appropriated condition between the RHA % and PS factors the RHA compound can be applied to produced the RHA/PP composite with small damages in its mechanical properties.

The RFAC elastic modulus is significantly lower than ordinary concrete, besides, RFA on elastic modulus was significantly affected than other mechanical properties.
There many factors affected concrete mechanical property, such as mix proportions design, compositions of materials, mixing time, construction technology and work environment.
In these factors, aggregate was a very important factor for concrete mechanical property.
The cause and infuence of self-cementing properties of fine recycled concrete aggregates on the properties of unbound sub-base[J].
Mechanical properties of concrete prepared with different recycled coarse aggregates replacement rate[J].

NEW POLYURETHANE UREA THERMOPLASTIC ELASTOMERS WITH CONTROLLED MECHANICAL AND THERMAL PROPERTIES FOR MEDICAL APPLICATIONS M.A.
Fine-tuning of morphology and mechanical properties allows to desighn adaptive materials with shape memory.
Such TPUs change their shape under the influence of various factors (temperature, light, magnetic and electric field, etc.) and belong to the class of adaptive, or so-called "smart" polymers [4, 5].
Results and Discussion Mechanical properties of adaptive materials are determined by the physical structure of crystals of the soft block.
This approach allows the mechanical and thermal properties of adaptive materials to be adjusted and the shape memory to be controlled.

Stress intensity factors are widely used as the main factors for controlling the fracture behavior of materials(6).
The material used here was medium carbon steel S45C (be equal to No.45 steel in China).The chemical composition and mechanical properties are shown in table 1 and table 2 individually.
Fig.1 Dimension of the specimen with jig for manufacturing slant crack Table 1 Chemical composition mass% C Si Mn P S 0.47 0.22 0.70 0.015 0.019 Table 2 Mechanical properties Fig.2 Dimension of the specimen with slant crack Residual stress measurements The residual stress distribution along the fatigue crack was measured by moving an X-ray beam with an area of 1×1mm2 intermittently on the specimen surface.
This is because the mode Ⅰbehavior is affected by residual stress mainly.
For fatigue cracks with different slant angles, the ratio of modeⅠstress intensity factors (KⅠ)mes/( KⅠ) are not affected by change of the slant angle and show the same value approximately.

Rheological Properties.
Mechanical properties of the cementitious composites were determined as the so called single crack tests in tension and bending.
However, the results in Table 2 also further indicate that the L/d ratio is not the only factor affecting the rheology of the fresh mixes.
These observations indicate that in the developed cementitious composite materials the fibres at 1 vol% dosage can not only affect the post-cracking behaviour but also have a considerable effect on the pre-cracking mechanical properties.
However, the fresh state rheological characteristics seem to be affected also by the surface properties of the fibres.

Influences of Process and Equipment on Filament Unevenness Jiangping Wanga, Zhihui Tianb, School of Mechanical Engineering, Xian Shiyou University, Xian, China ajpwang@xsyu.edu.cn, bzhtian@hotmail.com, Keywords: Polyester POY; Filament unevenness; Influence factors.
It is presented in this paper that the main factors which affect the filament unevenness in melt spinning.
The Influence of Melt Factors on Filament Unevenness The Effect of Melt Uniformity.
The Influence of Equipment Factors on Filament Unevenness The Effect of Metering Pump.
In production, the main factors causing amount fluctuations of sprayed melt are as following

Microstructure and Properties of 0.2mm Thick Sheet Titanium Alloy by Micro-laser Welding Liang Yu1,a, Yuhua Chen1, b, Weihuai Gong1, c 1 National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China aweld05021132@126.com, bch.yu.hu@163.com, cgwh050211 @126.com Keywords: Microlaser welding; Titanium alloy; Microstructure; Properties Abstract: 0.2mm thick titanium alloy sheet was butt-welded using micro impulse laser, influnce of the different processing parameter on the surface and cross-section morphology of welded joint was studied , testing the mechanical properties of joints.
The impact of environmental factors on the titanium alloy increases with temperature, O, H, N and titanium alloys have high reactivity, leading to embrittlement of welded joints.
(a) Base metal (b) Heat affected zone (c) Nugget Fig. 4 The microstructure morphology of welded joints The mechanical properties of joints.
The mean value is used to assess the average tensile properties of the specimen. 0.2mm thickness laser welded joints TC4 titanium alloy micro-mechanical analysis test data in Table 2.
Table 2 TC4 micro-tensile properties of laser welded joints Sample No.

However, complex properties of materials can change dramatically when exposed to the elevated temperatures and adversely affected.
Some factors such as adhesion in interface, friction and aggregate interlock influences the bond strength.
A total of 30 cube specimen (100 x 100 x 100 mm) and cylinder (100 m height with 200mm diameter) were prepared to determined the mechanical properties and physical properties of the concrete at elevated temperature.
The ultrafine POFA as a pozzolanic material for the production of GUSMRC proved a good potential in mechanical properties.
Shrive, Factors affecting bond between new and old concrete, ACI Materials Journal. 85 (1998) 117-125