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Geometry Effects When Controlling Residual Stresses in Friction Stir Welds by Mechanical Tensioning D.G.
Previously, an FE model was used to investigate the effectiveness of the mechanical tensioning technique [4].
The metal flow and mechanical effects of the tool were not considered.
The material and thermal-physical properties used were for a standard AA2024 alloy [9].
Above this point there is a progressive improvement in the affects of mechanical tensioning according to each decrease in speed.

The model was given material properties, fixed support, and being simulated on occlusal loads of 87 N and friction loads of 29 N for 0.7 seconds.
This step was performed using ANSYS 16.2® software continued with input material properties needed for each components in the models; porcelain protheses, titanium alloy implant Ti-6A1-4V, alveolar, cortical and trabecular bones, tooth (dentin and email), and periodontal ligament (Table 1).
But when mechanical stress concentration exceed ultimate strength threshold (69 MPa), this will affect osteoclast to be more active and clinically may cause bone resorption.
Schroetenboer (2008) suggested that alveolar crest was one of the key factor that affected the maintenance of peri-implant soft tissue architecture, implant system has to be well designed to distribute the stress onto the bone which may promote functional recovery and bone regenerations [9].
Okazaki, Comparison of fatigue properties and fatigue crack growth rates of various implantable metals, Materials (Basel). 5(12) (2012) 2981-3005

This is challenging, since improvement of some properties often means sacrificing of others.
This usually implies a trade-off between several factors.
In order to perform a realistic optimisation according to the definition above it is necessary to account for the complete production chain involving all the major processes and at the same time all possible parameters affecting the costs.
Output and input values from optimisation simulations on properties and costs of 6xxx series alloys.
Method for the optimisation of product properties and production costs of industrial processes (2014) WO 2014/007641 A1

Therefore, it is important to figure out how the factors affecting the degradation of wool fabrics.
Especially, when disulphide bonds, which are contained in cystine and form a specific cross-linked structure for wool and make it more resistant to extraneous interference than silk fiber, were broken, the mechanical, thermal and other properties of the wool changed greatly [6].
[3] Aksakal, B., et al., The effect of temperature and water on the mechanical properties of wool fibres investigated with different experimental methods.
[12] Bertini, F., et al., Wool keratin-polypropylene composites: Properties and thermal degradation.
[15] Niu, M., et al., Molecular structure and properties of wool fiber surface-grafted with nano-antibacterial materials.

The results indicate that the thermal expansion ratio substantially affects the contact stresses.
It is assumed that the thermo-mechanical properties of the coating (referred as medium) vary exponentially along the thickness, i.e
Accordingly, the thermo-mechanical properties of the substrate (referred as medium ) are denoted by , and which are taken to be constant.
It is clear that the coating thickness substantially affects the surface temperature rise.
A comprehensive parametric study was conducted to disclose the effect of the material properties, the coating thickness and the speed of cylinder over the surface stresses and the temperature rise as well.

The result shows that the model is accurate enough to be used to analyze the mechanical property of cracked aluminum plates repaired with adhesively bonded composite patches.
These loads can cause damage thereby affecting its load carrying capabilities and safe life.
The dimensions and material properties are given in Table 3.
Conclusions While composite patch adhesively bond repair technology is used increasingly widely, it is more and more important to evaluate mechanical properties of the repaired structure correctly.
Due to few analyzing hours and low computing cost, this model can evaluate mechanical properties of the repaired structure elementarily to supply references for repair design.

Within the scope of the study, thermal and sound insulation properties of carded and needle-punched pantyhose wastes are investigated.
The results show that the thermal and acoustic properties of the developed material are at a sufficient level, and it has ensured that polyamide wastes, which have superior properties among thermoplastic polymers and have high economic value, are brought back into the economy.
These studies show that the main factors affecting the heat transfer and sound absorption properties of the material are density, thickness, porosity and tortuosity.
These properties make textile-reinforced composites promising materials for sound and thermal insulation.
This process is important for improving the mechanical properties and reducing the sample thickness.

For the analyzing of this model is used factors experiment.
Table of real level values of factors of experiment N.
Factors Interval of factors Mark.
The microhardness is connected basically to the local changes in mechanical properties of the material. [3] It can be seen little difference in microhardess, that results in narrow HAZ.
Heat affected zone – zoom 200x Acknowledgment Paper deals with definition and evaluation of process factors and parameters of cut surface while cutting the material ISO Fe510.

A clear understanding of fatigue properties for the pipeline steel and its weld is important to provide information for pipeline design during pipeline construction and predict pipeline fatigue life during pipeline operation.
Tensile properties of pipeline steel and weld metal in girth weld are listed in Table 1.
Tensile properties of X65 pipeline steel and its weld.
Welded structures show a gradient of microstructure and mechanical properties from the weld metal to the unaffected base metal.
Significant researches regarding the microstructural change and the mechanical properties of X65 pipelines have been performed [7].

The effects of these ternary additives on the densification behaviors and mechanical properties were investigated.
Introduction Silicon nitride (Si3N4) has been applied in many areas due to its superior synthetical property such as high-temperature character, good mechanical properties, and superior erosion resistance [1,8].
With nano boron nitride powder made by deoxidization-nitrification method, Si3N4/BN, or SiC/BN composite ceramics with good mechanical and machinable properties were prepared by hot-press sintering.
Mechanical Properties.
Sekino, et al: Mechanical properties of Si3N4/BN composites by chemical processing.