Search results

during the polishing and cleaning process steps, resulting in a degradation of the electrical and mechanical properties [1-3].
The upper surface of the coupons was prenotched, and the mechanical properties were evaluated using the 4-pt bend (FPB) method [5] to determine adhesive fracture properties and double cantilever beam (DCB) method [6] to determine cohesive fracture properties.
The results show that polishing and cleaning with CP72B chemistry has negligible impact on the cohesive fracture energy, indicating that the dielectric film maintains its mechanical properties despite contact with the slurry under the mechanical stresses induced during polishing.
This suggests that other factors (besides particles) are playing a role in the interfacial adhesion, which requires further study.
Conclusions The effect of barrier slurry and cleaning on the mechanical properties of DEMS-based porous OSG (k=2.5)/SiCN and copper/SiCN films was determined.

Stress intensity factor.
The approach is presented through stages: detection of defects, stress-strain analysis of loaded component, characterization of material properties required for structural integrity assessment and application of convenient procedure.
As an example, in Fig. 2 is presented fracture of thick wall pressure vessel, experienced in 1964, caused by (1) presence of an undetected crack in welded joint and (2) poor fracture toughness properties in critical region, caused by improper heat treatment, which could not be determined that time [4], but post-festum.
analyzed numerically exploiting the property of J integral path independence [19].
Testing of experimental specimen of welded joint, shown in Fig. 8, with combined weld metal (OM-overmatched, UMundermatched WM), followed by clearly recognized different microstructures in the heat-affectedzone (HAZ) regions and ended by parent metals (BM) on both sides, revealed significant differences in crack resistance properties: high in BM, with expressed scattering in HAZ depending on region properties and crack tip position, and low, confirming crack behavior in Figs. 6 and 7.

Sn-Ag-Cu series solder has the following advantages: better heat circulation performance; good creep resistance; narrow melting point range; applicable to welding of any product; less affected by the ingredients and so on.
NUMERICAL MODEL AND MATERIAL PROPERTY Papers research Sn3.5Ag0.75Cu lead-free solder at different temperatures and different strain rate, and FR-4 substrate interface stress distribution.
Mechanical properties of Sn3.5Ag0.75Cu Material Tensile strength （MPa） Yield Strength （MPa） Sn3.5Ag0.75Cu 92.66 68.035 Table 1 indicates that the finite element analysis of isotropic materials, mechanical properties, Table 2 indicates that the room temperature, Table 3 indicates that the lead-free fiber material Sn3 .5 Ag0.75Cu mechanical properties and Sn3.5Ag0.75Cu material parameters of the visco-plastic model.
The results from the point of view: Sn3.5Ag0.75Cu lead-free solder at low temperature has a strong rate of relevance, to the high-temperature zone, expressed as rate-independent nature; another, Sn3.5Ag0.75Cu Lead-free solder temperature very sensitive affected by temperature greater at higher temperatures, with a strong temperature dependence.
Numerical Analysis on the influent factors of the interface stress of 63Sn37Pb under the temperature cycle condition [C] ICRMS2009.V2:P1230-1233

Then the micro structure and mechanical properties of specimens sintered with the best optimal parameters have been analyzed.
After the orthogonal experiment analysis, one parameter combination was chosen to fabricate specimens with aim to further analyze the micro structure and mechanical properties.
Mechanical properties test process For further examination of the mechanical properties of sintered specimens, the experiment specimens were designed as dimension 100×10×6 mm3 in shape of dumbbell for tensile experiment, and size in 40×6×6 mm3 specimens for flexuralexperiment.
Conversely, the porosity is increase with the increase of other factors.
Mechanical properties of sintered PC specimens Except possess some medical properties, the medical parts must maintain sufficient mechanical properties for use requirement.

The new status indirectly points that production uncertainty or manufacturing defect could be the potential factors for this adversity.
These includes loss of gloss, discoloration and hardening of the surface layer [8] and the most affected properties would be the elongation and flexural and impact strength [10].
It is assumed the in-service helmets physical and mechanical properties were equivalent to the newly produced.
This is due to the hardening of the shell outer layer after a prolonged exposure to environmental factors such as UV radiation [8].
‘Influence of environmental factors on energy absorption degradation of polystyrene foam in protective helmets’.

All of these properties make it can catalyze and degrade various organic pollutants and heavy metal [4, 5].
Carrying capacity involves two aspects, one is whether nZVI could disperse in foam stably, and the other is properties of foam would be changed or not.
Carrying capacity of foam on nZVI-M and the influencing factors.
Orthogonal experimental design: According to literatures research and preliminary experiments, the main factors that affect foam carrying capacity are surfactant type (ST), surfactant concentration (SC), initial concentration of nZVI (IC), foam quality (FQ) [14].
Concentrations of nZVI-M in Foam and the Influencing Factors.

Thus, polishability is affected by different variables such as the abrasion particles features, metallurgical factors of material and the previous surface feed marks from the milling process.
However, the presence of inclusions in the steel microstructure, which are added to increase machinability, such as non-metallic inclusions, oxides and sulphides, can diminish the polishability, depending on their size and distribution [2,3], affecting the quality of mould surface.
So, the main material properties required for application in polymer injection moulds are yield strength, abrasion resistance, corrosion resistance, machinability and polishability or glow finish.
Soon after, the AISI P20 steel and its variations with superior hardness and good combination of mechanical properties and low cost were introduced [4] in the mould production.
Designing, planning and conducting an experiment that simultaneously includes combinations of multiple factors and their interactions, which may affect the outcomes, is a much more efficient research methodology for empirical modelling.

Owing to its high mechanical strength, chemical inertness, low frictional coefficient, high wear and corrosion resistance properties and so on, carbon nanotubes (CNTs) films have emerged as a potential material for biomedical applications.
Previously, medical devices were selected based on its material and bulk properties.
However, it is now recognized that the surface properties of the device mainly govern its biomedical applications.
Carbon nanotubes (CNTs) films has emerged as a promising material for biomedical applications in recent years due to its high mechanical strength, chemical inertness, low frictional coefficient, high wear and corrosion resistance properties, high electrical resistivity.
The surface properties of samples were characterized using a water contact angle meter.

An analysis making it possible to evaluate the effect of the factors affecting the performance of the long-term cable constitutes the principal work in our lab.
Their mechanical properties change during their uses.
The damage by tiredness is described by the deterioration of the mechanical properties of material following cyclic requests.
The various theories representative of this damage is unified theory [5, 9]:  The request of a material in fatigue generally induces a degradation of its physical properties.  
This function of distribution has the following properties: F (-∞) = 0; F (+∞) =1.

A material's fracture toughness can also be affected by environmental factors such as humidity, temperature, and corrosion [4].
These fractures are induced by factors such as humid air, saltwater, and corrosive chemicals [6,7].
Many of these processes are also capable of affecting aluminium alloy and its composites [9, 8].
The corrosion environment has crucially affected the mechanical properties of the material.
The effect of hydrogen embrittlement on the mechanical properties of aluminum alloy.