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Because of coal winning machine actual working environment is very bad, the objects’ physical and mechanical properties are quite uncertain, coal winning machine output shaft bearing vulnerable to damage, so choose the right bearing is very important.
Introduction The rolling bearing is One of mechanical parts used widely in mechanical equipment.If bearing selection is unreasonable, and it often leads to premature bearing fatigue spalling or a sharp rise in bearing temperature, caused by burning, thereby enabling the bearing locking cage fracture and even rolling element and such as ring broken fault, seriously affecting the reliability of the machine.
Select bearing a variety of factors to consider, judge the main diversity of thinking.
Bearing life correction formula （1） In the formula: load factor; reliability life correction factor: the life of the lubrication correction factor; the life of the lubricating oil filter accuracy correction factor; the life of lubricating oil water content correction factor; material meltinglife modification factor; the life of the material surface hardness correction factcor; the life of the temperature correction factor; the radial clearance of the life correction coefficient; the life correction factor for axial deflection; basic dynamic load N; equivalent dynamic load, N; life index.
Mechanical design and manufacturing,2001,4(10):10-11.

The present paper presents experimental results concerning the mechanical characterization of an optimized cork agglomerate with enhanced mechanical properties.
Mechanical properties of these cork agglomerates were improved by using conventional cork granulates (with different sizes) with an epoxy resin as adhesive element.
Damage mechanisms affecting cork /carbon sandwiches begin with a small shear crack which propagates from the loaded zone following the direction of the middle plane towards the tips of the specimen.
These images allow inferring that PMI foam/carbon sandwiches absorb all the energy resulting from impact, leading to a deep perforation affecting the face sheet and also a considerable extension of damage within the core material.
[7] ASTM Standard C393-00: Standard Test Method for Flexural Properties of Sandwich Constructions (ASTM International, USA 2000)

Therefore, determining value of the spray parameters and their effects on the coating properties are always taken into consideration.
Then Taguchi method combined with ANOVA has become a powerful mean for solving optimal problems for multiple factors to each response and widely used [10].
Modification of the spray parameters changed the test results which proved that the study parameters affected the coating properties.
The difference between them is smaller than 2% (1.4% for adhesion; 0.8% for porosity; -1.5% for hardness) for all factors.
Baum, “HVOF-Sprayed Alloy IN718 - The Influence of Process Parameters on the Microstructure and Mechanical Properties,” in Thermal Spray: A United Forum for Scienttific and Technological Advances, ed.

Predicting the influence of microporosity on the mechanical properties and fracture behavior of high-pressure die-cast AM50 magnesium alloy X.
A lot of research had been carried on to investigate the typical room temperature mechanical properties and microstructure composition of HPDC Mg alloys [3, 4].
The previous studies indicated that the mechanical properties of HPDC Mg alloy have a quantitative correlation with the areal fraction of microporosity.
The value of K is affected by crack size, geometry characteristics and loading.
Conclusion High-pressure die-cast AM50 alloy exhibits variability in tensile properties.

Due to the multi-phase properties of composite material, its overall property is affected by a series of factors including single material characteristics, raw material content, geometric shape, composite method, interface status and complex extent.
Safety Factor.
However, as the wood residue fiber is relatively short, it can't meet the mechanical and other properties of sleeper material separately.
This program can significantly improve the flexural properties of composite materials, but can't decrease the effect of environmental factors on sleeper material's waterproof and anti-corrosion performance.
Moso bamboo-Chinese fir laminated composites and their properties.

The mechanical behavior of the fibre reinforced material depends on the structure of the composite, which has both the properties of concrete and the properties of the fibre used in the cement mixture.
The influence of such short, inclined fibers on the mechanical properties of reinforced concrete, as a rule, is smaller than the long fibers located parallel to the load.
However, the efficiency of the fibers in the cement matrix that increase the mechanical properties of concrete can be estimated in two ways: · Increase the strength of concrete
All three of these factors were not independent, as the effect of fiber length and orientation has a significant impact on the link between fiber and cement stone.
Study of physical-mechanical and rheological properties of high-strength steel fibre concrete, Architecture and construction. 1 (2013) 106–113

Methodology To reduce the number of runs while efficiently exploring the effects of multiple factors and interactions on the output response [1], RSM optimal custom is used [1], this involves two input factors: infill type (IP) and infill density (ID).
Summary of Input Factors and Output Responses.
Ke, “Mechanical properties optimization of poly-ether-ether-ketone via fused deposition modeling,” Materials, vol. 11, no. 2, Jan. 2018, doi: 10.3390/ma11020216
[23] “Standard Test Method for Tensile Properties of Plastics 1”, doi: 10.1520/D0638-14
Stergiou, “Mechanical Properties Predictive Model of Additive Manufacturing Specimens Using ANFIS,” 2024, doi: 10.20944/preprints202407.0094.v1.

Because of the water absorption rate of aggregate after wrapped film depends on the water absorption rate and complete degree of thin film, therefore, water absorption rate and strength of membrane structure have directly affected on the water absorption rate and crush indicators of recycled coarse aggregate 2.2 The influences of asphalt pretreatment technology on physical and mechanical performance of recycled coarse aggregate.
In consideration of choice for water absorption rate from acetic acid resin, asphalt factors the pretreatment of the test to select the lowest water absorption rate(That is acetic acid resin mixes with 6% spirit of vinegar and infiltrates eight hours; Asphalt content 2% xina water , infiltrates 2 hours), and compare the unmodified urea-formaldehyde resin before with the pretreatment of recycled coarse aggregate basic performance comparison, The results as shown in figure 3 below (recycled coarse aggregate performance of the various data calibration marked as 1, the infiltration of preprocessing performance indexes of the aggregate respectively with corresponding, taking ratio for the vertical axis).
That is to say, through infiltrating processes, enhancing the basic mechanical properties of recycled coarse aggregate is feasible.
(3) The effect of using asphalt to pretreated the recycled coarse aggregate is better than acetic acid resin, and also has a more obvious effect on improving the mechanical properties of recycled coarse aggregate; the test of the best improvement effect with using asphalt to infiltrate and pretreat the recycled coarse aggregate is that: adding 2% xina water into the asphalt and then infiltrating 2 hours
[3] Ilker B, Sdim S, Properties of concretes produced with waste concrete aggregate, J.

Concerning fracture mechanics, the same trend observed in the general mechanical properties is maintained.
Yu, L, Natural biopolymer alloys with superior mechanical properties, ACS Sustain.
Van Staden, J, Eucomis zambesiaca baker: Factors affecting in vitro bulblet induction, S.
Huang, Improved mechanical properties of carbon nanotubes-coated flax fiber reinforced composites, Mater.
Vittoria, New Nanohybrids of Poly(e-caprolactone) and a Modified Mg/Al Hydrotalcite: Mechanical and Thermal Properties, J.

Compression Resistance of Polythene Coatings for Welded Joint on Pipeline Chang Du 1, a, Yang Chen 2, b, Ming Li3, c 1North China Institute of Science and Technology, Lang Fang, China 2 Coal Science Research Institute, Bei Jing, China 3 Sinopec Beijing Yanshan Company, Bei Jing, China aduchang0602@163.com, b chenyang471465356@qq.com, c675020918@163.com Key words: polythene coatings for pipeline welded joint, proportion of indentation depth, bursting strength, influence factors Abstract.
With indentation and puncture tests, this article chooses several typical 3PE heat shrinkable sleeve field coating material, characterizes their compression resistance and influence factors by determination on the proportion of indentation depth (PID) and bursting strength.
The effect of the mending material is resisting mechanical damage and isolating media, which is an important part of ensuring the integrity of the coating system.
As the effect of various external shocks during construction and the impact of plant roots in service puncture, the anti-pressure properties of the PE coating must be considered when selecting 3PE heat shrinkable sleeve.
Pressure value select 10MPa load which refers to determination of indentation hardness in GB/T 23257-2009; Given that physical and mechanical properties of polymer materials changes obviously with temperature, this research decides separately test 25℃ at room temperature and 50℃high temperature.