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Introduction Polyethylene (PE) has found widespread use as a packaging material primarily due to its excellent mechanical properties, chemical and biological inertness, low cost, and high energy effectiveness [1].
A combination of all these factors contributes to the inertness of PE.
Other physical factors affect the degradation rate including morphology and surface area of the materials [5].
Mechanical strength was evaluated by using an Instron 5565 Instrument.
Generally, the degradation of PE is initiated at weak sites and proceeds via the formation of hydroperoxide intermediates to form carbonyl compounds, leading to chain scission and loss of mechanical properties.

Prof., Dept. of Mechanical Technology, Univ. of Miskolc, Hungary 3, PhD, Assoc.
However, in the course of fabrication, particularly those where post-weld heat-treatment is difficult or impossible such as in the repair and reconditioning of in-service fabrications or where transition welds are required, different filler materials are preferred to introduce different mechanical properties such as higher ductility or lower yield strength.
It has therefore been necessary to examine the effect of the material interface for modern steel grades using numerical analysis simulating various responses to conditions and properties in each component.
This change of flow affected the decomposition of the Fe3C, (M3C) and this affected the dimension of the decarburised zone.
Acknowledgements Dr Kirk wishes to thank Professor Kleemola for valuable discussions concerning the solubility factors noted in the text.

In this work plasma surface modification approach was used to improve mechanical properties by synthesis of composite layer structure on a pure titanium surface.
Introduction Specific properties of titanium and its alloys such as excellent corrosion resistance high strength to weight ratio, high temperature mechanical properties are readily used for a structural components in aerospace, chemical, petrochemical and marine industries [1,2].
Successful osseointegration of implant material and proper functioning after orthopaedic and trauma surgery, depends from various surface factors.
Fast cool-down and chemical composition change with the obtain fine-grain structure, results in mechanical and wear properties improvement.
Mechanical properties improvement for obtained layers may contribute in materials longer use results from galling and spallation suppression.

Nanoscale Alumina-Reinforced Aluminum Matrix Composites: Microstructure and Mechanical Properties Jixiong Han.1,a Yong-Ching Chen2,b and Vijay K.
Tensile Properties and Strengthening Mechanisms.
Comparison of Properties with Previous Reports on Al-Matrix Composites.
Although the tensile properties of these composites are affected by a number of concurrent and mutually interactive influences, several insights can be drawn from the data.
In this context, the microstructure and mechanical properties of a 2024 Al matrix-nanoscale Al2O3 reinforced DSC composite has been studied and the results will be presented in a forthcoming publication.

In order to obtain the mechanical parameters, using 70.7 × 70.7 ×70.7mm mould to do eight groups of small specimens.
After 28 days, testing the small specimens with the Changchun Research Institute for Testing Machines Co., Ltd(CRITM) producing the CSS-55100 electronic testing machine, and through MTS's latest version of Test Works 4.0 software to collect, calculate and so on, getting physical and mechanical property parameter, the test results meet the similarity criteria, in Table 1.
Chose one unit from this area to analyze mechanical phenomena.
According to the rock fracture mechanics, fracture propagation process in its tip stress intensity factors[5] （7） Where, - quasi-static pressure, GPa; -fracture length, mm; -shot hole radius, mm; -stress intensity factor correction factor.
Blasting Effect UT Analysis Fig.2 Complex cutting seam cartridge The rock elastic wave velocity reflects the physical and mechanical properties of rock.

In order to enhance the mechanical properties of copper joints, FSW has been regarded as an effective welding method for the joining of copper.
The grain size of the nugget zone is determined by two major factors.
Hardness of samples is in close relation with two different factors.
Effects of friction stir processing on mechanical properties of the cast aluminum alloys A319 and A356.
Effect of welding speed on microstructure and mechanical properties of friction stir welded copper.

If the assumption of the highest values of acoustical or mechanical impedance of the space boundaries (damping properties of boundaries) is made, the modal coupling can be neglected.
The shape of the space together with properties of space boundaries influences the distribution of the field.
In the case of optimization or generally in a control of the acoustic field inside of an enclosure, many factors should be considered e.g. area of boundaries, their configuration, location, the acoustic properties of the materials, which can cover the walls, sound/noise source position.
It is assumed, that damping in the system comes from a boundaries’ properties, not from the medium.
(15) In this problem, the total number of designs variable finally depends on two factors.

Therefore, a series of modal testing and simulation calculation of chatter stability are produced to gain the effect of various factors on chatter in machine-cutter system.
The main cutter factors to affect chatter stability are tool overhang and tooth number.
L: Chinese Journal of Mechanical Engineering , 2003, Vol.16 (1): pp.13-16
Li: China Mechanical Engineering, 2005, Vol.16(13): pp.1146-1150
Cheng all: Chinese Journal of Mechanical Engineering, 2007, Vol.43(1): pp.164-167.

The chemical structure, thermal properties and hydrophilic performance of the copolymers were respectively characterized.
The chemical nature and incompatibility of these segments are the important factors of the properties of the poly(ether ester) elastomers.
PEG was considered to fully react in almost all works, which has developed the mechanical property, thermal property, ageing-resistant performance and chemical resistance of the copolymers[14-16].
Thermal properties was reduced when decreasing the molecular weight of PEG unit as it increased the irregularity of molecular chains[19].
Factors affecting weathering of a polyether–polyester elastomer, Polym.Degrad.

Moreover, sheet metal material's anisotropic properties, as well as blank positioning, affect the forming process greatly.
Material Properties.
Mechanical properties of used materials are listed in Table 1.
Table 1 Physical and mechanical properties of AL1100.
One of the major important factors that affecting hydroforming is the surface roughness before and after hydroforming processes.