The Modification of Mechanical Properties of Changbai Mountain Smell Pine Used by Floor

2012 ◽  
Vol 430-432 ◽  
pp. 866-868
Author(s):  
Xiao Yi Niu ◽  
Yu Wen Bai ◽  
Xue Wang
Keyword(s):  
Mechanical Properties ◽  
Optimum Condition ◽  
Small Molecules ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Changbai Mountain ◽  
Molar Ratio ◽  
Absolute Pressure ◽  
Mass Ratio ◽  
Laminated Veneer Lumber

In this experiment, do smell pine impregnated pressure experiments with small molecules phenolic resin. Prepare different small molecules and phenolic resin by orthogonal.Handle the specimens. Compare the treated material with the smell pine. The optimum condition is the temperature of 60°C, PVA: P (mass ratio) = 3%, P: F: NaOH (molar ratio) = 1:1.2:0.3, the absolute pressure 2.5 Mpa, the temperature of 120 °C hot 15 minutes under the conditions. While smell pine laminated veneer lumber bending strength increased 67.53%.

Preparation and Properties of SiC/Phenolic Resin for the Heat of LED

2016 ◽  
Vol 848 ◽  
pp. 454-459
Author(s):  
Cong Wu ◽  
Kang Zhao ◽  
Yu Fei Tang ◽  
Ji Yuan Ma
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Powder Metallurgy ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Experimental Results ◽  
Low Thermal Conductivity ◽  
Industry Standard ◽  
Insulation Performance

In order to solve the problem that low thermal conductivity of the plastics for the heat of LED, SiC/Phenolic resin for the heat of LED were fabricated combining powder metallurgy. The effects of particles diameters, content and adding nanoparticles on thermal conductivity of the fabricated composites were investigated, the mechanical properties were also characterized. The experimental results showed that the materials were obtained, and the insulation performance of the fabricated SiC/Phenolic resin was higher than the industry standard one, the thermal conductivity reached 4.1W/(m·k)-1. And the bending strength of the fabricated composites was up to 68.11MPa. The problem of low thermal conductivity of the material is expected to be solved. In addition, it is meaningful for improving LED life.

Low Temperature Densification of ZnO-Based Ceramic Using Phenolic Resin as Binder

2014 ◽  
Vol 668-669 ◽  
pp. 35-38
Author(s):  
Hui Zeng ◽  
Jing Jing Xie ◽  
Hai Tao Liu ◽  
Zheng Yi Fu
Keyword(s):  
Mechanical Properties ◽  
Boundary Layer ◽  
Low Temperature ◽  
Grain Boundary ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Effect Of Temperature ◽  
Microstructure And Mechanical Properties

ZnO-based ceramic was densified at low temperature by using PSP as binder. The results showed that phenolic resin filled in the ZnO grain boundary layer. The sample has a well hardness of 0.8 GPa and bending strength of 78 MPa. The effect of temperature on the microstructure and mechanical properties was also investigated. It was found that the samples sintered at 300 °C showed higher density and better mechanical properties.

EFFECT OF STEREOCOMPLEX FORMATION IN D-LACTIDE-CONTAINING PLLA ON THERMAL BEHAVIORS AND MECHANICAL PROPERTY CHANGES USING THE AGEING DEGRADATION TEST

2013 ◽  
Vol 25 (05) ◽  
pp. 1340003
Author(s):  
Tsai-Chin Shih ◽  
Che-Tong Lin ◽  
Sheng-Yang Lee ◽  
Wei-Jen Chang ◽  
Nai-Chia Teng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Mechanical Performance ◽  
Test Method ◽  
Molar Ratio ◽  
Thermal Behaviors ◽  
Binding Strength ◽  
Stereocomplex Formation ◽  
Degradation Test ◽  
Hydrolytic Resistance

Introduction: The formation of a stereocomplex between PLLA and PDLA has been studied intensively because it increases the mechanical performance and thermal/hydrolytic resistance of polylactide-based materials; however, few studies have investigated the stereocomplex formation between PLLA and the (D-lactide)-containing PLLA copolymer. To investigate the effect of the D-lactide content of PLLA on the thermal behaviors and mechanical properties, (5D/95L) polylactide [(5D/95L)PLA], which contains a molar ratio of 5% of the D-form and 95% of the L-form of the monomer, and (15D/85L) polylactide [(15D/85L)PLA], which contains a molar ratio of 15% of the D-form and 85% of the L-form of the monomer, were used in a series of specimens. For the hydrolytic degradation test, the specimens were placed in 20-mL vials, which were filled with phosphate-buffered solution; the vials were allowed to stand at 57°C for 91 days in accordance with the ASTM F1635-95 (2000) standard test method for in vitro studies. The mechanical properties, thermal properties and crystallization behaviors were investigated using DSC and MTS, respectively. Results: The initial bending strength of the (5D/95L)PLA and (15D/85L)PLA were 35.4 and 31.1 N, respectively. After 1 week, the binding strength of the (5D/95L)PLA increased by 9.8%, and the binding strength of the (15D/85L)PLA decreased by 26%. In addition, the DSC curve of the (5D/95L)PLA demonstrated a higher melting temperature in the 1st week, and this Tc was observed in the DSC curve of the (5D/95L)PLA only during this time. The DSC curve of the (15D/85L)PLA was irregular. Discussion & Conclusions: In the (5D/95L)PLA, the recrystallization that occurred during the hydrolysis process was confirmed by the Tc and the increase in the bending strength. The stereocomplex crystallites may be formed in the (15D/85L)PLA during the degradation process. Because of the increase in the D-form monomer, the stereocomplexes were generated more easily and acted as nucleation sites. The PLLA crystal near the stereocomplex crystallites exhibited an incomplete structure, which led to a faster decrease in the bending strength. The low D-lactide content in the matrix of the PLLA did not form a stereocomplex crystallite because the surface area was not large enough to act as a nucleation site. However, the higher D-lactide-containing fraction formed a large stereocomplex crystallite. The (5D/95L)PLA demonstrated better thermal/hydrolytic resistance and mechanical stability than the (15D/85L)PLA.

scholarly journals Mechanical Properties of Laminated Veneer Lumber Beams Strengthened with CFRP Sheets

2019 ◽  
Vol 65 (2) ◽  
pp. 57-66 ◽  
Author(s):  
M. Bakalarz ◽  
P. G. Kossakowski
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Bending Strength ◽  
Carbon Fabric ◽  
Static Work ◽  
Work Analysis ◽  
Cfrp Sheets ◽  
Laminated Veneer Lumber ◽  
Frp Reinforcement ◽  
Bottom Face

AbstractThis paper presents the results of the static work analysis of laminated veneer lumber (LVL) beams strengthened with carbon fabric sheets (CFRP). Tested specimens were 45mm wide, 100 mm high, and 1700 mm long. Two types of strengthening arrangements were assumed as follows: 1. One layer of sheet bonded to the bottom face; 2. U-shape half-wrapped reinforcement; both sides wrapped to half of the height of the cross-section. The reinforcement ratios were 0.22% and 0.72%, respectively. In both cases, the FRP reinforcement was bonded along the entire span of the element by means of epoxy resin. The reinforcement of the elements resulted in an increase in the bending strength by 30% and 35%, respectively, as well as an increase in the global modulus of elasticity in bending greater than 20% for both configurations (in comparison to the reference elements).

Engineered Wood Composite of Laminated Veneer Lumber: Physical and Mechanical Properties

2016 ◽  
Vol 842 ◽  
pp. 103-128
Author(s):  
Kang Chiang Liew ◽  
Singan Grace
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Moisture Content ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
P Value ◽  
Thickness Swelling ◽  
Laminated Veneer Lumber ◽  
Physical Testing ◽  
Acacia Hybrid

Utilisation of forest plantation species such as Acacia hybrid has been used in wood-based industry as an alternative to solid wood that was usually attained from natural forest. While, the under-utilised species such as Mangifera sp. is not often been used as raw material for wood products, in this study, laminated veneer lumber (LVL) has been produced from Acacia hybrid and Mangifera sp. The physical and mechanical properties of LVL were determined and compared. For physical testing, the range value of moisture content was 9.41% to 14.56%, Density was 487.90 kg/m3 to 699.10 kg/m3, thickness swelling was between 0.20% to 6.05%, water absorption between 32.71% to 91.25%, and rate of delamination from 0% to 100%. Mangifera sp. LVL has higher moisture content, rate of delamination, and water absorbency. In mechanical testing, it is been found that Acacia hybrid LVL has overall higher strength compared to Mangifera sp. LVL, in terms of static bending strength (MOR and MOE), shear strength, and compression strength. Range of value for MOR was between 10.27 N/mm2 to 129.99 N/mm2, MOE between 1138 N/mm2 to 16472.93 N/mm2, shear strength between 0.43 N/mm2 to 3.40 N/mm2, and compression between 139.45 N/mm2 to 6749.74 N/mm2. For physical testing, the overall result of p-value for moisture content, water absorption, and delamination were significant at p ≤ 0.05, while density and thickness swelling were not significant at p ≥ 0.05. For overall result, the p-value for static bending strength (MOR and MOE) was significant at p ≤ 0.05 while for shear strength and compression strength were not significant at p ≥ 0.05.

Study on Absorbency and Strength of the Carboxymethyl Medical Cotton Gauze

2013 ◽  
Vol 821-822 ◽  
pp. 502-510
Author(s):  
Hai Ling Dai ◽  
Mei Ying Tan ◽  
La Mei Guo
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Sodium Hydroxide ◽  
Molar Ratio ◽  
Breaking Force ◽  
Mass Ratio ◽  
Cotton Gauze ◽  
Salt Absorption ◽  
Substitution Degree ◽  
Proper Condition

Based on the carboxymethyl reaction of the medical cotton gauze, the paper analyzed absorbency and strength of the carboxymethyl medical cotton gauze. According to different concentrations of sodium hydroxide, molar ratio of sodium hydroxide and chloroactic acid, and mass ratio of chloroactic acid and cotton gauze, we found the best conditions on the excellent absorbency and strength of the carboxymethyl medical cotton gauze. It`s shown that, when the concentration of sodium hydroxide is 20%, the molar ratio of sodium hydroxide and chloroactic acid is 2.7:1, and the mass ratio of chloroactic acid and cotton gauze is 1.5:1, the substitution degree of the carboxymethyl cotton gauze will be 0.2132, the water absorption will be 370.5%, the salt absorption will be 292.3% and the breaking force will be 181.8N. After the carboxymethyl reaction of proper condition, the cotton gauze possesses the excellent mechanical properties based on the good absorbency.

Influence of Auxiliary Abrasive on the Resin Bond Used in Diamond Tools

2014 ◽  
Vol 563 ◽  
pp. 211-214
Author(s):  
Tao Lin ◽  
Shi Lei Li ◽  
Hui Ping Shao ◽  
Zhi Wang ◽  
Xin Bo He
Keyword(s):  
Mechanical Properties ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Abrasive Tool ◽  
Rockwell Hardness ◽  
Diamond Tools

The effects on the mechanical properties for three auxiliary abrasive with different hardness were researched by changing the content of the auxiliary abrasives in the phenolic resin-based bond in this paper. The abrasive tool sample's bending strength and Rockwell hardness were tested. It shows that with the increase of TiO2 content, the hardness and strength reduced firstly, but then increased; and when the content of TiO2 was 5%, the Rockwell hardness decreased by 30% and the bending strength fell by 44.98%. As the CeO2 content increases, the hardness of the abrasive tool changed little, while the bending strength decreased more, and when its content was 1%, the bending strength decreased by 25.63%. When the content of SiO2 is 3%, he bending strength decreased by 32.82%; and when its content is 5%, the Rockwell hardness reduced by 24.97%, and then its hardness has a substantial increase.

Influence of Auxiliary Material on the Performance of the Resin Bond Used in Abrasive Tools

2013 ◽  
Vol 842 ◽  
pp. 18-21
Author(s):  
Shi Lei Li ◽  
Tao Lin ◽  
Zhi Wang ◽  
Xin Bo He
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Abrasive Tool ◽  
Rockwell Hardness ◽  
Abrasive Tools ◽  
Auxiliary Material ◽  
Powder Content ◽  
Grinding Efficiency

The resin bond abrasive tool was prepared by hot pressing in this paper. The effects on the mechanical properties for three auxiliary materials were researched by changing the content of the auxiliary materials in the phenolic resin-based bond in this paper. The samples were tested by the abrasive tool sample's bending strength and Rockwell hardness. It shows that following by increasing the Cr2O3 content, the bending strength and hardness reduced, when the content was 5% and a substantial increase, and when the content was 5%, flexural strength of 9.28%, the hardness increased up 8.93%. When the content of NaHCO3 is 16%, the hardness was reduced by 21.71%, the flexural strength fell by 35.61%. As the SiC powder content increases, the hardness of the abrasive will be a weak decrease, the bending strength decreased more, and when the SiC content of 7%, the hardness decreased by 11.11%, 31.25% of the bending strength decreased, while the grinding efficiency is also reduced.

scholarly journals Highly Mechanical Performance of Laminated Veneer Lumber Induced by High Voltage Electrostatic Field

2019 ◽  
pp. 67-75
Author(s):  
Qian He ◽  
Tianyi Zhan ◽  
Zehui Ju ◽  
Haiyang Zhang ◽  
Lu Hong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
High Voltage ◽  
Electrostatic Field ◽  
Shear Failure ◽  
Bending Strength ◽  
Mechanical Performance ◽  
Contact Angles ◽  
Bonding Interface ◽  
Laminated Veneer Lumber

The high voltage electrostatic field (HVEF), as a novel technology, was applied in the study to obtain a highly mechanical performance of LVL (laminated veneer lumber) by increasing limiting value of shear failure strength directly affected by bonding strength. The surface property of wood, polymerization extent of PF, bonding interface of wood-to-PF and mechanical properties of LVL were investigated under the HVEF treatment. The results showed that increased free radicals and total surface energy were acquired under the HVEF treatment resulting from more polar groups (?OH, ?CHO) and ions were triggered leading to decreased contact angles identified both for Poplar and Masson specimens. The HVEF provided more reactions among wood-to-UF and more cross linking reaction of PF occurred in the treating step. The tendency of vertical density profile was more extremely steep than the control with max density increased by 24.93% and 30.24% for Poplar and Masson LVL respectively since adhesive aggregated continuously and orderly along bonding interface and permeation depth reduced to around 200 ?m, accounting for improved bonding shear strength, which eventually brought an enhancement on mechanical properties of LVL with horizon shear strength (?and?), modulus of elasticity and static bending strength significantly enhanced by 14.65%, 10.68%, 20.67% and 12.34% for Poplar LVL and that of Masson LVL enhanced by 17.30%, 13.93%, 18.55% and 12.72%. Besides, the delamination ratio was decreased by 49.57% and 58.32% respectively both for Poplar and Masson specimens.

The Optimal Ratio of Mixed Talc Silica and Narathiwat Clay for Cordierite-Mullite Refractories

2018 ◽  
Vol 766 ◽  
pp. 223-227
Author(s):  
Nattawut Ariyajinno ◽  
Sakdipown Thiansem
Keyword(s):  
Mechanical Properties ◽  
Optimum Condition ◽  
Water Absorption ◽  
Bulk Density ◽  
Bending Strength ◽  
Raw Materials ◽  
Apparent Porosity ◽  
Kiln Furniture ◽  
Firing Shrinkage ◽  
Xrd Patterns

In this paper, effects of incorporation of Narathiwat clay (NT), talc and silica on the mechanical properties of cordierite-mullite refractories were investigated. The starting raw materials were mixed in different ratios and fired at 1300 °C for 2 hours. XRD patterns of fired refectories indicated cordierite and mullite phases. The fired samples were studied the firing shrinkage, water absorption, bulk density, apparent porosity and bending strength of the cordierite-mullite refractories. The optimum condition was achieved for the composition of 20% Talc that had shrinkage: 11.78%, water absorption: 4.16%, bulk density: 2.28 g/cm3, apparent porosity: 9.2% and bending strength: 330.82 kg/cm2. The results thus showed that Narathiwat clay, talc and silica was a potential materials for use kiln furniture cordierite-mullite refractories.

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