JPH05501385A - reinforced composite structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] reinforced composite structure The present invention relates to reinforced composite structures, and more particularly to reinforced composite structures having optimal bending and shear properties. Not only that, but the joints between the web and flange of each member are extremely superior. Mold or pultrusion molding in which reinforcing fibers are formed to have strength Regarding fiber-reinforced preform constructions for rusted composite structures It is.

Molded or pultruded composite structures include braided reinforcement mats, knitted reinforcement mats, mats, continuous filament mats and many other reinforcing mats to strengthen the structure. It is well known because it is used in These mats are placed in a mold or pulled It is drawn out and bent around the corners to strengthen it. The direction and quality of reinforcement is stress It can be varied in different parts of the member to match the level and direction, but Joints of different parts cannot be satisfactorily strengthened, e.g. when forces pull the flange away from the web. If you try to tension it, it will deviate from the plane strain bending strength or local tensile strength. To overcome these problems, knitted, braided and braided preforms are known. In addition to the reinforcing fibers that run on the surface of the flange and web portion, The fibers are knitted, braided or braided to improve their strength. Unfortunately these Braided, knitted, and braided methods have poor axial strength and structural rigidity. what If so, the fibers should be sufficiently continuous in the flange and web parts in the plane of the structure. That's because they haven't. Rather than being continuous in the plane, the fibers extend through the thickness of the structure plane. It is knitted continuously over the entire length. This twisting causes fibers to lose their strength and become matrix The stress properties become more important due to the stress transfer at the points of change in fiber direction, and therefore the Becomes more sensitive to trix deterioration. Total stiffness is reduced due to fiber discontinuities.

According to the present invention, the fiber-reinforced preform as claimed in the claims is embedded in the matrix material. A composite structure consisting of foam can be provided.

Further, according to the present invention, a reinforced composite structure having a web portion and a flange portion can be manufactured. It is possible to provide a fiber-reinforced preform for use in construction, where the reinforcing fibers are reinforcing fibers placed parallel to the axis of the foam and at right angles to said axis. The wrapped flange reinforced portion and the reinforcing fibers are aligned in a direction inclined relative to the axis. overlapping, each of its opposing directions being between 30° and 80° with respect to said axis. consisting of a web reinforcement section that is inclined at an angle of .

The advantage of using such reinforced preforms is that flanges and webs can be The accuracy of fiber positioning at the joints between sections is improved.

Preferably one or more layers of fibers, such as glass fibers, are used in the web or flange portion. Depending on the application, it can be used for at least one of the following. In addition, the web reinforcing fiber is I can deal with it. The main reinforcing fibers made of a suitable material are preferably continuous fibers. , at the edge of the flange and the edge of the web section, at the junction of the web and the flange section. , it is only twisted from the predetermined direction of the straight line. Angle angle in web section The linear reinforcing fibers passed through these parts selectively up and down, facing the web part. Form a loop around the 90° fiber closest to the outer surface of the flange section. . The reinforcing fibers in the flange section, which are placed at 0° to the axis of the structure, are each preformed. Continuous along the length of the frame.

A loop of web section strength angled around the flange section at 90° outwards is Provides a strong direct bond between the web and flange parts and at the same time all main structure parts to keep the reinforcing fibers straight. Type of reinforcing fiber used, angle of web reinforcement and quality can be varied depending on the design of each structure. However, given material content The optimal structure in terms of total strength and stiffness for This can be achieved through excellent bond strength and rigidity between the and flange parts. This reinforcement construct is Mold or pultrusion for matrices including plastics and ceramics It can be used for any composite structure formed by. Structure geometry is a structure can vary along its axis, or can be made constant by more common pultrusion. Wear.

In a preferred embodiment, each layer includes reinforcements with angles of +X0 and -Xo. Consisting of at least two layers, each web section is secured to each other using a security mat. At intervals, the security mat absorbs matrix material during the molding or pultrusion operation. can be collected. The fiber reinforcement is formed as described above, and the web partial reinforcement is A loop is formed around the 90° fibers at the lunge, but the web reinforcement layer The part where the loop is formed around the flange reinforcement should be spaced using a mat to ensure be placed. The guarantee of these reinforced connections is further ensured that the web sections are joined together during bending in the following cases: Improve the strength of the flange. That is, the distortion caused by local loads causes high This is the case when a high transverse bend results in a section or high residual torsional strength is required.

The web and flange parts are reinforced as described above, and the flange parts are placed above and below the flange. The 90° fibers of the flange portion are bonded to the face of the continuous web portion, and the 90° fibers of the flange portion loops around the diagonal web fibers closest to the outer surface of the web portion opposite the form a loop.

The present invention also comprises a fiber-reinforced preform as described above with embedded matrix material. Contains composite structures.

Embodiments of the invention will now be described with reference to the accompanying drawings.

Figure 1 shows the T-shaped joint between the web and flange portion of a fiber-reinforced composite structure. FIG.

Figure 2 shows the flange section of the flange section shown in Figure 1 showing a web section with a fiber reinforced structure. FIG.

Figure 3 shows the L-shaped joint between the web and flange portion of the fiber-reinforced composite structure. FIG.

FIG. 4 is a cross-sectional view of a composite board member as an example of the use of a reinforced preform construction.

Figure 5 is a cross-sectional view of a composite connecting member as a further example of the use of reinforced preform constructions. be.

FIG. 6 is a cross-sectional view of another composite part.

Figure 7 shows a composite structure using a security mat at the flange to increase bond strength. FIG. 3 is a cross-sectional view of a T-shaped joint.

Figure 8 shows a composite structure in which the web continues above and below the flange and is partially reinforced by the present invention. FIG. 3 is a perspective view of the joint between the flange portion and the web portion of the structure.

FIG. 9 is a cross-sectional view of a composite part for assembly and retention of a wall core.

With reference to Figure 1 of the drawings, a portion of the complete composite structure includes a flange portion 1 and a web portion 2. have Matrix made of plastic or ceramic is shown for illustration purposes. It is depicted with only transparent views. The flange portion has an edge 7 and is made of fiberglass. - It is reinforced with three layers. The first layer 4A is deflected by 90° with respect to the structure axis 3. , forming a loop around 9 at the flange edge 7. The second layer 10 is on axis 3 It consists of continuous fibers that are deflected by 0° and run under the reinforcing preform. 3rd layer 4 B is deflected by 90° with respect to the axis 3 and also forms a loop at the flange edge 7. Ru. Web portion 2 has fibers 5A deflected +X0 relative to axis 3 and -X0 deflected fibers 5B. These diagonal fibers 5A and 5 B is looped over the top layer of the 90° flange reinforcement 4A shown at 6.

With reference to FIG. 2, web fibers 5A and 5B are each at a distance of 10 (i.e., 3A), -X' (i.e., 8B) is shown obliquely. Also, these fibers are A loop is formed on the flange fiber 4A that crosses in the flange portion 1. cormorant The web reinforcing fiber 5A passes upward between the flange fibers 4B and 10 and loops on the fiber 4A. After that, the fiber 5B passes back downward again.

In this method, the preform is braided from continuous fibers in a continuous motion.

With reference to Figure 3, the flange portion 11 is the wafer forming the L-shaped portion of the complete composite structure. Stop at the line in the blank section. The flange section is reinforced with three layers of fiber reinforcement. 1st and third layers 13A and 13B are each deflected by 90° with respect to the axis 15 of the structure, and the fibers are A loop is formed around 18 at the outer corner 17 of the L-shaped portion. fiber 19 The second layer of is oriented O0 with respect to the axis of the structure. The web portion 12 is of a structure. Fiber 14A with +X0 deflection with respect to axis 15 and -X0 deflection with respect to axis 15 It is reinforced with fibers 14B. These diagonal fibers 14A and 14B are 16 A loop is formed on the top layer of the 90° flange reinforcement 13A shown at .

Regarding FIG. 4, the composite plate members are connected by a T-shaped joint 21 and an L-shaped joint 20. in cross-section with a flange portion 22 spaced by web portions 23 and 24; It is shown. The preferred reinforcing structure for this board member is a fiber reinforced preform. 2, the flange, web portion and T-shaped joint 21 are shown in FIG. and reinforced as shown in FIGS. 1 or 7, and the L-shaped joint 20 is reinforced as shown in FIGS. 2 and 3. strengthened so that

With reference to FIG. 5, the web portion where the composite connecting member is connected at L-shaped joints 25 and 26 Shown in cross section with flange portions 27 and 30 spaced apart by 28 and 29. It is. The preferred reinforcing structure of this connecting member is for manufacturing fiber reinforced preforms. The flange portion and L-shaped joints 25 and 26 are shown in FIGS. 2 and 3. strengthened as such.

6, the new composite section pulls the flange section 34A from the web section 33. The flange portion 34A has a cross section where a strong force is applied as if it is about to be torn off. It is shown. Preferred reinforcement structures for this section include the flange section 34A and the web section. The portion 33 and the T-shaped joint 31 are reinforced as shown in FIGS. 2 and 1 or 7. The purpose is to produce fiber-reinforced preforms. In addition, the L-shaped joint 32 is shown in FIG. 3 and the other joint 32A is reinforced as shown in FIG. be done.

With reference to FIG. 7, flange portion 35 connects to web portion 36. in this case, There are two layers of web reinforcing fibers 40 and 42, each attached to the axis of the structure as shown. It has fibers at angles of +x0 and -Xo with respect to the line. These web fibers are It passes upward through the flange between fibers 38 and 39 and on the 90° flange reinforcing fiber. A loop is formed. Web fiber layers 40 and 42 are spaced apart using a security mat 41. This increases the lever arm between the web fibers and the anchoring part at the flange. this This improves the performance of the connection and resists plane bending effects.

8, the complete composite structure includes a web portion 44 extending above and below the flange portion. and a flange portion 43. The flange part has three fiber reinforced parts. It is reinforced with a layer of The first layer 45A and the third layer 45B are aligned with the axis 49 of the structure. deflected 90° to form a loop around 48, and the diagonal web portions 47A and is re-approximated to the outer web surface. The second layer of the flange part is the shaft It consists of continuous fibers with O0 deflection relative to line 49 and running underneath the reinforcing preform.

Web portion 44 has fibers 47A and 4 having a +X0 and -X0 deflection, respectively, to axis 49. It has been strengthened with 7B.

With respect to Figure 9, the composite part can be connected to suitable structures such as architectural beams or retaining wall structures. For connecting flange part 49.51.52, web part 53.54.58.59 ．． 60 is shown in cross section. The preferred reinforcing structure for this part is The langes and web portions and T-junctions 57 and 60 are shown in FIGS. 2 and 1 or 7. the L-shaped joint 55 is reinforced as shown in FIGS. 2 and 3; Other joints 56 are reinforced as shown in FIG.

The above description indicates that the web portions have angles of +X0 and -X0 with respect to the axis of the structure. Regarding the deflection of the fibers in minutes, X is selected from the range 30-80°. selected The angles determined in each application are determined by the relative magnitude of the different design forces on each web section. by. The forces that influence this selection are shear forces in the plane of the web section and structural around said axis in a web plane parallel to or perpendicular to said axis. This is the shear force from the bending surface. If shear is dominant, the preferred angle is 45° If the bending prevails about an axis close to and parallel to the axis of the structure, the preferred angle is It is preferred if the bending predominates around an axis close to 30° and perpendicular to the axis of the structure. A desirable angle is close to 8°.

Voluntary procedure amendment July 8, 1992 &

Claims (14)

[Claims] 1. Fiber reinforcement used to produce reinforced composite structures with web and flange parts In reinforced preforms, reinforcing fibers are placed parallel to the axis of the preform. and a flange reinforcement portion overlapping reinforcing fibers placed perpendicular to the axis. , overlapping web reinforcements in a direction oblique relative to said axis; and, each of said opposing directions being at an angle of 30 to 80° with respect to said axis. degree-sloped fiber-reinforced preform. 2. The reinforcing fibers of the flange portion and/or the web portion are braided. Preform. 3. The sloped fibers of the web reinforcement portion extend in one of the oppositely sloped directions and said relative material passing over the right angle fibers of the web portion reinforcement and up to the edge of the web portion structure. A fiber formed by one or more continuous fibers extending in the other direction Preform according to claim 1 or 2. 4. fibers extending in one of said oppositely inclined directions at the edge of the web reinforcement; 4. The preform according to claim 3, wherein the preform returns to form a loop extending in the other direction. form. 5. The right angle fibers of the flange reinforcement return and advance across the flange section construction. Any one of claims 1 to 4, consisting of one or more continuous fibers forming a loop. Preform as described. 6. Parallel flange reinforcement is made from continuous fibers extending along the length of the preform. The preform according to any one of claims 1 to 5. 7. The flange reinforcement section is a web reinforcement section that extends to opposite sides of the flange section. The right-angled flange section connects to the slanted web section forming a loop around the fibers. Preform according to any one of claims 1 to 6. 8. The fibers of the web reinforcement have angles of +X° and -X° with respect to said axis. 8. Any one of claims 1 to 7, wherein X is in the range 30 to 80°. Preform as described. 9. From two or more layers of web reinforcement fibers spaced apart from each other by spacing mats. The preform according to any one of claims 1 to 8. 10. Fibers according to any one of claims 1 to 9 embedded in a matrix material. Composite structure consisting of reinforced preform. 11. In a composite structure consisting of a web part and a flange part, the flange part The reinforcing fibers are placed parallel to the axis of the structure, and the reinforcing fibers placed perpendicular to the axis are overlap, and the reinforcing fibers in the web portion are oriented in a direction that is oblique to the axis. - burlap and each of said opposing directions is 30 to 80 degrees relative to said axis. ° A matrix embedded in at least one layer of fiber reinforcement formed in an inclined manner. Composite structure made of box material. 12. The reinforcing fibers of the web portion also have angles of +X° and -X° with respect to the axis. and X is in the range of 30 to 80 degrees. Composite structure. 13. spaced apart from each other by mats embedded within said matrix material. The composite according to any one of claims 10 to 12, comprising two or more layers of web reinforcing fibers. Structure. 14. 14. The matrix according to claims 10-13, wherein the matrix is made of plastic or ceramic. Composite structure according to any one of the items.