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The mechanical properties become stable with natural ageing at room temperature within a few days for some heat-treatable alloys, especially 2XXX series, considerable changes of the properties occur even after many years for some of them.
This alloy is a heat-treatable alloy and its mechanical properties can be strengthened by precipitation hardening process [3,6].
In this study, three levels L9 orthogonal array was used to inspect the effect of 4 factors.
The factors and their levels are given in Table 2.
So the AA2024 material should be quenched in a short time so as to obtain good mechanical properties.

Other bio-based materials like polyhydroxyalkanoates (in our case PHBV) could be associated with PLA in order to improve its gas barrier properties and/or its mechanical properties.
We can observe that adding 10% of PHBV in PLA by blending lead to an increase of the elongation at break without affecting much the stresses compared to pure PLA films.
The differences between the permeability of the coextruded films and the polymer blend films could be explained by 2 factors: an overlapping effect of the lamellaes and a crystallinity degree effect of the PHBV layers or lamellaes on the PLA.
This morphology offers both better mechanical and barrier properties than pure PLA.
Hernandez.R, Mechanical, physical and barrier properties of poly(lactide) films, J.

The contribution deals with evaluation of mechanical properties of thin hard coatings prepared by ARC evaporation on steel substrate K110.
Introduction Mechanical properties of thin films often differ from those of the bulk materials.
These additives, when used in small quantities, affect positively the structure of coatings, namely by improving their oxidative properties, refining the structure and upgrading the adhesive properties and thus contributing to better industrial properties [4].
A nanoindenter is a testing machine with high resolution that allows one to measure properties on sub-micro and nano-scale and serves particularly as a primary technique for determination of mechanical properties of thin layers and small construction parts.
Many studies are available dealing with deformation mechanisms of thin coatings by means of nanoindentation technique because many different factors may affect the coating and the substrate at loading.

The strength, stiffness and stability of components are related with the mechanical properties of used materials, the mechanical properties are determined by the tests of materials.
Differences sample processing affect the accuracy of mechanical properties test results, in the mechanical properties test, even the same material, performance sample processing is different, it can cause test results are different.
This is because the test piece size is smaller, the probability of various defects in the test piece working parts is on the decline, and effect that external factors for the test piece are decreased, test piece has reflected the real characteristics of the materials.
For round test piece, with the decrease of working part diameter the index of mechanical properties increase, if diameter was smaller, it would more accurately reflect the real properties of materials; it is not obvious that the shoulder transition area r affect the mechanical properties of test material, but, elongation is lower when shoulder transition area r is less than 4 mm; with the increase of the performance sample surface roughness the index of mechanical properties decrease.
For flat test piece, with the increase of the working part width the elongation increased slightly, and it is not obvious that it affect the index of other mechanical properties.

The structural changes accompanying SPD that lead to improved mechanical properties are noted.
The mechanical properties of these materials are affected by many factors.
For using the UFG and NC materials for engineering applications, their fatigue properties need to be understood along with other mechanical properties.
Among the various factors, friction, die corner angle and strain hardening property critically affect the deformation homogeneity of work pieces in ECAP [185].
The mechanical properties of AZ31 Mg alloy processed through ARB are given in Table 4.

This paper investigated the mechanical strength and shrinkage properties of the concrete mixtures frequently used in Florida.
The empirical relationship between the mechanical properties of concretes and shrinkage strain was analyzed mathematically.
Thus, it has the potential to use just the mechanical properties of the concretes to predict their shrinkage behaviors.
Comparison of mechanical properties of high strength concrete made with different raw mateials.
Effect of coarse aggregate characteristics on mechanical properties of high strength concrete.

Aggregate gradation need to consider the following factors: (1)Particle/resin composites reinforced mechanism [5,6] In 1976, using polyester resin for the base material, glass beads for reinforced materials, J·Leinder and R·T·Woodhams obtained the composite strength formula including filler particle with experiment and theoretical calculation for the strength of composite material, they believed that the following two aspects were critical factor to affect the strength of particle/resin composites.
A: The bonding degree between filler and base material is important factor to affect the strength of particle/resin composites.
B: The particle size of filler is also important factor to affect the strength of particle/resin composites
Aggregate Gradation Scheme Research： Using continuous gradation scheme, choosing standard rectangular cross-section sample, controlling resin content about 9%~15%, observing the surface condition and mechanical properties of the sample under the different gradation through experiments.
The mechanical properties of the sample under the different resin content were analyzed with gradation scheme A.

Based on the comprehensive analysis of the microstructure, microhardness and mechanical properties, the effect of Cu content on the welding microstructure and mechanical properties of the alloy is clarified.
The mechanical properties were tested at room temperature by the AG-XPlu-100KN tensile testing machine.
Results and Analysis Welding joint properties.
The Fe phase has an adverse effect on the properties of the alloy and will seriously affect the welding properties of the alloy.
The main reasons including two factors.

Cellulose-based biodegradable cushioning packaging material Wang juwei (Beihua University, Jilin, 1320132) wahaha@123.com Key words: Waste polyurethane， Alkali lignin， Cellulose，Mechanical properties，Biodegradable sex，Packaging materials Abstract：In recent years, with the requirements of environmental protection of packaging materials improve, biodegradable materials more and more attention to.
The results show that: to recycle waste as raw material, add natural renewable material alkali lignin and cellulose, and influence factors of sheet material performance, get the film material performance is the ideal process parameters.
The orthogonal experiment results show that waste polyurethane: alkali lignin: cellulose = 3:4:6 made materials when mechanical properties and degradation is better.
Cellulose can affect the mechanical properties of biodegradable packaging materials are many factors on the experimental analysis of the information obtained, directly affect the test results, there are three underlying causes, namely the amount of waste polyurethane, the amount of alkali lignin and cellulose dosage the delivery ratio.
In the case of normal temperature and pressure molding time was 3h, emphasis on the amount of waste polyurethane, the amount of alkali lignin and cellulose than the amount put on the physical and mechanical properties of materials, so the experimental design three factors, three levels of L9 (33) Orthogonal test table.

Particle size of silica sand affects the mechanical properties such as compression, hardness, and transmittance of SLS glass.
Melting temperature, soaking time, and melt accelerant can also affect the mechanical properties of SLS glass.
These properties are significant factor which affect the glass melting temperature, and the clarity and quality of glass product.
The software used statistical modeling to determine simultaneously the individual and interactive effects of many factors that could affect the output results [5].
Even different particle size range affects mechanical and optical properties of soda lime silicate glass.