flexural properties of southern pine plywood overlaid with fiberglass-reinforced plastic.
Abstract This paper presents the experimental results of a significant improvement in the bending performance of Nansong plywood when covering both sides with two layers of polyester fiber
Wovenroving glass fiber soaked.
In the direction parallel to the surface veneer particles, the stiffness and strength of the overlay layer are 3-
Laying plywood increased the percentage of 27 and 57 respectively, and the covered plywood increased by 5-
Growth at 22 and 34% respectively.
Perpendicular to the direction of the surface veneer texture, covering the stiffness and strength of 3-
Laying plywood increased by 718 and 310% respectively, covering plywood 5-
Ply Plywood increased by 94 and 246% respectively.
It is recommended that future studies of this reinforced plywood should include an assessment of edge shear strength, plate shear modulus and surface penetration resistance.
Behavior of composite materials combining two wood and plastic
Reinforced wood and metal
Wood composites have been extensively studied for many years [6-13,15-17,19-21].
Most studies focus on structural analysis of composite behavior and the degree of structural improvement provided by adding higher density wood, metal or reinforced plastic to the composite surface.
Despite reporting impressive structural improvements in the composites studied, few successful sales were made.
Clearly, future users must make changes to try new and innovative products with a relatively higher price than traditional products.
For many, the structural advantages of enhancing composites do not justify relatively high prices, as the material and manufacturing costs associated with these products are often high.
Currently, there are two composite panel products
Woodoverlays is on sale in the market.
One is structural plywood covered with fiberglass
The other is structural plywood covered with high or medium density (HDO or MDO).
These panels have the advantage of high strength
High weight ratio and durability, anti-abuse. The fiberglass-
Reinforcement panels are currently used in the transport industry as body and lining components for cargo containers, railcars and truck trucks.
The fiber glasshoureinform is in different forms, types and weights in these groups (
Coarse or broken glass)mixed (saturated)
Use a variety of different resins (
It is reported that the best contact person is
Woven polyester molding
The average tensile strength of the roving fiberglass laminate is about 40,000 psi, while its stiffness is about 2. 5 to 3. 0 million psi .
Another composite board of HDO or MDO structural plywood is mainly used for road signs, concrete forms and other industrial purposes.
The overlays in these panels are usually soaked with a phenol resin of HDO and MDO at least 45 and 22%, respectively .
If some of these composite panels can be produced more economically, they can meet the needs of another industry. e.
Material for moving the side circumference or sheath of the walls and roof of the house.
This part of the mobile home industry needs materials that can provide structural rigidity for structures in extreme weather conditions (e. g. ,tornadoes).
These composite panels can provide additional stiffness as they have excellent bending strength as well as high edge shear strength and plate shear stiffness. The value-
The added and profit potential of covering structural boards with reinforced plastic is very obvious.
In 1998, for example, structural plank production in North America reached 38. 7billion [ft. sup. 2]
, Increase 4.
From 1977 9%3].
This production figure represents 19. 75 billion ft. of plywood (51%)and19. 0 billion ft. 
For strandboard (49%).
A large part of it is used for the construction of mobile houses, with an average of about 200,000 mobile houses per year in the United States. 18].
However, there are still many outstanding issues regarding the technical and economic feasibility of using plastic reinforced structural planks in this type of building.
Therefore, the purpose of this study is to determine: 1)
3-bending properties of samplesply and 5-
Southern Pine Tree laid with fiberglass
Reinforced Plastic; and 2)
The degree of improvement in bending (MOE)and strength (MOR)
The properties of the composite compared to the plywood core.
Materials and methods fiberglass covering the covering material used in this study is a commercial resin
Woven chain fiberglass dipping sheet.
The fiberglasswoven film (40 in. wide)was 18 oz. /[yd. sup. 2]
By weight, by weight, by the weight of 42 percentage, the modified polyester resin with amino sulfur agent was added.
The uncured thickness of the plate is 0. 016 inch.
The covering material consists of two layers of uncovered resin
In the middle of the 25 × 30 inch electric press Press press together the dipped woven fiberglass sheet.
Curing is carried out with 280 psi at degrees]
8 samples are cut parallel to the direction of the Loom, and 8 samples are cut perpendicular to the direction of the loom.
Cut the specimen first 8.
5 incheslong and 1 inch wide, then processed according to astm d-638-98 .
Measure the width and thickness of the sample with a digital clamp until the nearest 0. 001 inch.
According to astm d-, all samples were tested for tensile failure on the Instron testing machine638-98 . The load-
The extended relationship to failure was obtained in the middle of the uniform width
Sections of each specimen.
Moe and tensile strength values for each sample were calculated.
Plywood core in order to minimize the structural variability of composite core, 3-ply and 5-
The ply Southern pine plywood used in this study was manufactured at a commercial pine plywood plant in Alabamacut veneers.
Select veneers with no visible defects in the factory for this study. The 3-
Laying plywood 1/10-
Inch finish and 1/8-
Inch veneer core. The5-
Laying plywood 1/10-
1/8-inch veneer and center
Inch veneers at the intersection.
Use an extended phenol resin with a 90 pounds/1,000 square foot double glue line.
Preheat the panel with 160 psi for 3 minutes and then heat
Press [with 200 psi at300 [degrees]F for 4-1/2 and 5-
3-1/2 minutesply and 5-
Curtain layer, respectively.
Three panels of each plywood structure (i. e. ,3-ply and 5-ply)
Was used to obtain specimens for this study.
Half of each panel is used to obtain samples that determine the bending performance of the plywood, and the other half is used to cover the fiberglass reinforced material.
10 samples of curved plywood with surface veneer texture parallel to span and 10 samples of surface veneer texture perpendicular to span were obtained from each panel.
According to astm d-, the dimensions and testing of all samples are made with a central load3043-95 .
To calculate the values of MOE and MOR, the moment of inertia is based on the entire cross-section of each plywood sample.
The second composite material
Half of each plywood is cut into two piecesby30-inch sections (the 30-
In, parallel to face veneer texture).
Each section is covered with a glass fiber cloth soaked with two layers of polyester resin. The machine-
The direction of the woven cloth has passed-
Parallel to the direction of the surface veneer.
The adhesion and simultaneous curing of fiberglass covering the plywood core was carried out in the previously described press icpress, applying 175 psi at 280 [degrees]16 minutes.
In order to facilitate the release of the composite material after curing from the pressure, the industrial high temperature Teflon film was placed between the composite material and 0. 085-inch-
Thick steel seam.
After curing, the mixture cools-
Turn off at room temperature.
The laminated curing thickness of the two-layer woven las laser covered on the plywood core is 0. 022 inch.
Total thickness of 3-ply and 5-
The composite material of Ply Plywood is 0. 380 inch and 0.
590 inch respectively.
From the two parts of the same panel, 10 curved samples were cut, 2 inch wide, surface veneer particles parallel to the length of the sample, and 10 surface veneer particles perpendicular to the length of the sample.
The length of the parallel sample is 48 times the thickness plus 2 inch, and the length of the vertical sample is 24 times the thickness plus 2 inch.
According to astm d 3 043-, all samples are tested for bending failure under central load95.
To calculate the values of MOE and MOR, the moment of inertia is based on the entire cross-section of each fiberglass
Reinforced composite sample.
Results of tensile properties of cured materials and results of discussion
Table 1 lists the layer fiberglass materials used as the cover.
These results show that the tensile strength of the fiberglass reinforcement in the direction parallel to the loom is 18% higher than that in the direction perpendicular to the loom.
The tensile strength in the parallel direction of the fiberglass reinforcement is 3-560% higher than the known tensile strengthply, 3/8-
Inch South Pine plywood 【:14].
Stretch the adorable fiberglass reinforcement in a direction of about 70% than the adorable month-ply, 3/8-
Inchsouthern pine plywood parallel to surface veneer grain .
Table 2 lists the bending properties of the composite consisting of plywood covering two layers of woven fiberglass and the properties of the plywood core.
The results show that 3-ply core (0. 380 in. thick)and 5-ply core (0. 590 in. thick)fiberglass-
Compared to the control plywood, the reinforced plywood samples tested with span parallel to the direction of the surface textured veneer were hardened by about 27 and 22% respectively (3-ply and 5-ply)specimens.
In addition, the covered samples were about 57 and 34% stronger than the control plywood samples, respectively.
When overlaid3-ply and 5-
The specimens laying plywood are perpendicular to the direction of the surface texture veneer for span testing, and their stiffness values are 718 and 94% higher than those of the control samples, respectively.
The same covered samples were also 310 and 246 percent stronger than the control plywood samples, respectively.
Recommended property offiberglass-
Determination of reinforced plastic plywood: transverse shear strength, plate shear modulus, and penetration resistance.
Conclusion the results given here can be inferred that if the stiffness and strength of Nansong plywood are covered on both sides by two layers of thin fiberglass, the improvement can be considered
This improvement in structural properties will make plywood very attractive in the new market.
It enhances the practicality of truck trailer bodies, intermodal containers, highway signs and other industrial applications where strength and durability and damage resistance are the main considerations.
The authors are honorary professors and associate professors from the School of Forestry, Auburn University. , AL 36849-5418.
The paper was published as an agricultural expert in Alabama. Sta. J. Series No. 9-996042.
This article was published in June 1999. Reprint No. 8998. (+. )
Members of the Forestry Society.
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3-average of bending strength and stiffnessply and5-
Under the span of 48, plywood surface textures parallel to and perpendicular to the span were tested for laying plywood slats and fiberglass reinforced plywood samplesto-
According to astm d 3043, the depth ratio. [a,b]
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