CN104456052A - Bionic composite pipe capable of improving torsion resistance capability - Google Patents

Abstract

The invention discloses a bionic composite pipe capable of improving the torque resistance capability and belongs to the technical field of engineering. A rigid layer structure of the bionic composite pipe is the outermost layer of a pipe wall, and the number of layers of loosening layer structures and the number of layers of strengthening layer structures are the same, and the loosening layer structures and the strengthening layer structures are arranged in sequence at intervals from the rigid layer structure to the interior. The thickness of the first layer of loosening layer structure is equal to that of the rigid layer structure, and the thicknesses of all the layers of loosening layer structures form a geometric sequence with the common ratio of 0.77. The thicknesses of all the layers of strengthening layer structures are the same, and strengthening fibers in the layers are wound along a center axis where the pipe is located. The rigid layer structure, the loosening layer structures and the strengthening layer structures are formed in a gluing mode. The ratio of the total thickness of the wall of the bionic composite pipe and the outer radius corresponding to the wall of the bionic composite pipe is 0.382. According to the bionic composite pipe, the buckling bearing capability and the torsion resistance capability of the pipe can be improved, the bionic composite pipe has the advantages of being capable of absorbing energy, reducing pressure and absorbing vibration, light and high in strength. The pipe is not prone to deformation in work, and the dragging resistance of the pipe in the rotation process can be reduced.

Description

A kind of bionical composite pipe that can improve anti-twisting property

Technical field

The invention belongs to field of engineering technology, be specifically related to a kind of bionical composite pipe that can improve anti-twisting property.

Background technique

Along with the application of composite pipe is more and more extensive, the kind of composite pipe also gets more and more.At engineering field, composite pipe occupies critical role with its lightweight, high-strength, corrosion resistant, the advantage such as wear-resisting in tubular goods.But the service condition of composite pipe also has very large improves space, also proposes higher designing requirement to composite pipe.

Bamboo curculionid is the main harmful organism of a kind of bamboo grove, makes a living, bamboo grove death-rate can be caused time serious to reach 100% to bore food bamboo shoots.Bamboo curculionid head tube is long and tough and tensile, and can go deep into bamboo inside completely and not cause head tube to rupture, its excellent anti-twisting property mainly comes from its excellent head tube structure, brings very large inspiration to the design of bionical composite pipe.

Summary of the invention

The object of the present invention is to provide a kind of bionical composite pipe that can improve anti-twisting property.

The present invention is by rigid layer structure A, weaker zone structure B and reinforced layer structure C composition, wherein rigid layer structure A forms tube wall outermost surface, weaker zone structure B is identical with the number of plies of reinforced layer structure C, and arranged by the inside sequence interval of rigid layer structure A, in weaker zone structure B, the thickness of the 1st layer is equal with the thickness of rigid layer structure A, in weaker zone structure B each layer thickness to be common ratio be 0.77 Geometric Sequence, the each layer uniform thickness of reinforced layer structure C, and reinforcing fibre is wound around along the central shaft of place pipe in layer, rigid layer structure A, between weaker zone structure B and reinforced layer structure C, gummed forms,

The mathematic(al) representation of the geometrical relationship of rigid layer structure A, weaker zone structure B and reinforced layer structure C is:

$\left\{\begin{array}{c}{W}_P=0.382\×R\\ w_A=w_{B1}\\ w_C=0.224\×w_A\\ W_P=w_A+{\mathrm{\Σ}}_{i=1}^n{w}_{\mathrm{Bi}}+{\mathrm{nw}}_C\end{array}\right.---\left(1\right)$

Weaker zone structure B by the mathematic(al) representation of rigid layer structure A each layer thickness relation is inwards:

$\left\{\begin{array}{c}\\ q=0.77\\ w_{\mathrm{Bi}}=w_{B1}\×q^{i-1}\\ {\mathrm{\Σ}}_{i=1}^n{w}_{\mathrm{Bi}}=\frac{w_{B1}\×(1-q^n)}{1-q}\end{array}\right.---\left(2\right)$

In mathematic(al) representation (1) and (2): W _pfor bionical compound tube wall total thickness; The outer radius of R corresponding to bionical compound tube wall; N is the number of plies of weaker zone structure B or reinforced layer structure C, and 0<n≤10; w _afor the thickness of rigid layer structure A; w _bifor the weaker zone structure B thickness of i-th layer from outside to inside; w _cfor the thickness of reinforced layer structure C every layer; Q is the common ratio of Geometric Sequence.

The material of described rigid layer structure A is: Q235B steel and aluminum alloy.

The material of described weaker zone structure B is: closed-cell aluminum foam (ZL102) and closed cell foamed ceramics.

The material of described reinforced layer structure C is: fiber-reinforced resin matrix compound material and fiber reinforced aluminum matrix composites.

Beneficial effect of the present invention is:

1. can improve the flexing carrying of tubing and the anti-twisting property of tubing.

2. there is the feature of energy-absorbing, voltage stabilizing damping, the integral rigidity of tubing can be improved simultaneously, make tubing not yielding in operation.

3. there is the feature of high-strength light, the drag of pipe in rotation process can be reduced simultaneously.

Accompanying drawing explanation

Fig. 1 is as the number of plies n=5 of weaker zone structure B (reinforced layer structure C), the cross-sectional structure schematic diagram of bionical composite pipe

Fig. 2 is the Von Mises Stress Map of common composite pipe in embodiment 1

Fig. 3 is the Von Mises Stress Map of bionical composite pipe in embodiment 1

Fig. 4 is the first principal stress cloud atlas of common composite pipe in embodiment 1

Fig. 5 is the first principal stress cloud atlas of bionical composite pipe in embodiment 1

Fig. 6 is the total displacement vector cloud atlas of common composite pipe in embodiment 1

Fig. 7 is the total displacement vector cloud atlas of bionical composite pipe in embodiment 1

In Fig. 2 to Fig. 7: conventional pipe represents common composite pipe, bio-pipe represents bionical composite pipe.

Embodiment

The present invention is by rigid layer structure A, weaker zone structure B and reinforced layer structure C composition, wherein rigid layer structure A forms tube wall outermost surface, weaker zone structure B is identical with the number of plies of reinforced layer structure C, and arranged by the inside sequence interval of rigid layer structure A, in weaker zone structure B, the thickness of the 1st layer is equal with the thickness of rigid layer structure A, in weaker zone structure B each layer thickness to be common ratio be 0.77 Geometric Sequence, the each layer uniform thickness of reinforced layer structure C, and reinforcing fibre is wound around along the central shaft of place pipe in layer, rigid layer structure A, between weaker zone structure B and reinforced layer structure C, gummed forms,

The mathematic(al) representation of the geometrical relationship of rigid layer structure A, weaker zone structure B and reinforced layer structure C is:

$\left\{\begin{array}{c}{W}_P=0.382\&times;R\\ w_A=w_{B1}\\ w_C=0.224\&times;w_A\\ W_P=w_A+{\mathrm{\&Sigma;}}_{i=1}^n{w}_{\mathrm{Bi}}+{\mathrm{nw}}_C\end{array}\right.---\left(1\right)$

Weaker zone structure B by the mathematic(al) representation of rigid layer structure A each layer thickness relation is inwards:

$\left\{\begin{array}{c}\\ q=0.77\\ w_{\mathrm{Bi}}=w_{B1}\&times;q^{i-1}\\ {\mathrm{\&Sigma;}}_{i=1}^n{w}_{\mathrm{Bi}}=\frac{w_{B1}\&times;(1-q^n)}{1-q}\end{array}\right.---\left(2\right)$

In mathematic(al) representation (1) and (2): W _pfor bionical compound tube wall total thickness; The outer radius of R corresponding to bionical compound tube wall; N is the number of plies of weaker zone structure B or reinforced layer structure C, and 0<n≤10; w _afor the thickness of rigid layer structure A; w _bifor the weaker zone structure B thickness of i-th layer from outside to inside; w _cfor the thickness of reinforced layer structure C every layer; Q is the common ratio of Geometric Sequence.

The material of described rigid layer structure A is: Q235B steel and aluminum alloy.

The material of described weaker zone structure B is: closed-cell aluminum foam (ZL102) and closed cell foamed ceramics.

The material of described reinforced layer structure C is: fiber-reinforced resin matrix compound material and fiber reinforced aluminum matrix composites.

Embodiment 1:

Suppose that the outer radius of bionical composite pipe is 220mm, pipe range is 2200mm, weaker zone structure B and reinforced layer structure C are respectively 3 layers, and rigid layer structure A, geometrical relationship between weaker zone structure B and reinforced layer structure C meet mathematic(al) representation (1), wherein, the thickness relationship of each layer in weaker zone structure B is had again to meet mathematic(al) representation (2).

Meanwhile, for evaluating the superiority in anti-twisting property of bionical composite pipe, the common composite pipe that design is similar with bionical composite pipe structure.The rigid layer structure A of common composite pipe and the rigid layer structure A of bionical composite pipe has same thickness; Weaker zone structure B in common composite pipe is equal with the weaker zone structure B total thickness in bionical composite pipe, and the number of plies is also equal, but each layer of weaker zone structure B in common composite pipe is uniform thickness; In common composite pipe, reinforced layer structure C is equal with each layer thickness of reinforced layer structure C in bionical composite pipe, and the number of plies is also equal.

So work as R=220mm, during n=3, each several part design size of bionical composite pipe and common composite pipe is as shown in table 1.

Table 1: work as R=220mm, during n=3, each several part design size (unit: mm) of bionical composite pipe and common composite pipe

Finite element simulation experiment of the present invention:

Experiment is carried out in ANSYS14.5 finite element analysis software, adopts shell unit shell181 and particle unit mass21, fixes bionical composite pipe and common composite pipe one end simultaneously, loads the moment of torsion of 2000Nm at the other end.

Suppose that bionical composite pipe is identical with common composite pipe corresponding position material, and the material that each structure adopts is respectively: rigid layer structure A is Q235B steel, and weaker zone structure B is average pore size is 3-4mm, and relative density is 0.22g/cm ³, porosity ratio is the closed-cell aluminum foam (ZL102) of 55%, and reinforced layer structure C is carbon fiber enhancement resin base composite material (T300/5208).Young's modulus and the Poisson's ratio of above-mentioned material are as shown in table 2:

Table 2: the Young's modulus of composite pipe material therefor and Poisson's ratio

Material	Young's modulus	Poisson's ratio
			Q235B	2.1e11Pa	0.3
ZL102	2.71e8Pa	0.34
			T300/5208	1.81e11Pa	0.28

After Computer Simulation, obtain following result:

The von mises Stress Map of common composite pipe and bionical composite pipe is respectively shown in Fig. 2 and Fig. 3.Can see, compared with common composite pipe, the von mises stress maximum value of bionical composite pipe reduces 7.2%.

The first principal stress cloud atlas of common composite pipe and bionical composite pipe is respectively shown in Fig. 4 and Fig. 5.Can see, compared with common composite pipe, the first principal stress maximum value of bionical composite pipe reduces 6.7%.

The total displacement vector cloud atlas of common composite pipe and bionical composite pipe is respectively shown in Fig. 6 and Fig. 7.Can see, compared with common composite pipe, the total displacement vector maximum of bionical composite pipe reduces 7.5%.

So above-mentioned data can prove: compared with common composite pipe, bionical composite pipe has clear superiority in anti-torsion.

Embodiment 2:

Suppose that the outer radius of bionical composite pipe is 22mm, pipe range is 220mm, and weaker zone structure B and reinforced layer structure C respectively have three layers.And rigid layer structure A, geometrical relationship coincidence formula (1) between weaker zone structure B and reinforced layer structure C, wherein, have again the thickness relationship coincidence formula (2) of each layer in weaker zone structure B.

Meanwhile, for evaluating the superiority in anti-twisting property of bionical composite pipe, the common composite pipe that design is similar with bionical composite pipe structure.The rigid layer structure A of common composite pipe and the rigid layer structure A of bionical composite pipe has same thickness; Weaker zone structure B in common composite pipe is equal with the weaker zone structure B total thickness in bionical composite pipe, and the number of plies is also equal, but each layer of weaker zone structure B in common composite pipe is uniform thickness; In common composite pipe, reinforced layer structure C is equal with each layer thickness of reinforced layer structure C in bionical composite pipe, and the number of plies is also equal.

So work as R=22mm, during n=3, each several part design size of bionical composite pipe and common composite pipe is as shown in table 3.

Table 3: work as R=22mm, during n=3, each several part design size (unit: mm) of bionical composite pipe and common composite pipe

Finite element simulation experiment of the present invention:

Experiment is carried out in ANSYS14.5 finite element analysis software, adopts shell unit shell181 and particle unit mass21, fixes bionical composite pipe and common composite pipe one end simultaneously, loads the moment of torsion of 20Nm at the other end.

Suppose that bionical composite pipe is identical with common composite pipe corresponding position material, and the material that each structure adopts is respectively: rigid layer structure A is aluminum alloy, and weaker zone structure B is average pore size is 1mm, and relative density is 0.62g/cm ³, porosity ratio is the closed cell foamed ceramics of 64%, and reinforced layer structure C is carbon fiber reinforced aluminum matrix composite.Young's modulus and the Poisson's ratio of above-mentioned material are as shown in table 4:

Table 4: the Young's modulus of composite pipe material therefor and Poisson's ratio

Material	Young's modulus	Poisson's ratio
			Aluminum alloy	7e10Pa	0.3

Closed cell foamed ceramics	7.9e8Pa	0.108
			Carbon fiber reinforced aluminum matrix composite	1.48e11Pa	0.27

After Computer Simulation, obtain result as shown in table 5:

Table 5: the simulation result of bionical composite pipe and common composite pipe

	Vonmises stress maximum value	First principal stress maximum value	Total displacement vector maximum
				Common composite pipe	0.546e8Pa	0.342e8Pa	0.101e-4m
Bionical composite pipe	0.506e8Pa	0.317e8Pa	0.984e-5m
				Compare reduction	7.32％	7.31％	2.57％

Can see, compared with common composite pipe, the von mises stress maximum value of bionical composite pipe reduces 7.32%, and the first principal stress maximum value of bionical composite pipe reduces 7.31%, compared with common composite pipe, the total displacement vector maximum of bionical composite pipe reduces 2.57%.

So above-mentioned data can prove: compared with common composite pipe, bionical composite pipe has clear superiority in anti-torsion.

Claims (4)

1. one kind can be improved the bionical composite pipe of anti-twisting property, by rigid layer structure (A), weaker zone structure (B) and reinforced layer structure (C) composition, wherein rigid layer structure (A) forms tube wall outermost surface, weaker zone structure (B) is identical with the number of plies of reinforced layer structure (C), and by rigid layer structure (A) inwardly sequence interval arrangement, in weaker zone structure (B), the thickness of the 1st layer is equal with the thickness of rigid layer structure (A), in weaker zone structure (B) each layer thickness to be common ratio be 0.77 Geometric Sequence, the each layer uniform thickness of reinforced layer structure (C), and reinforcing fibre is wound around along the central shaft of place pipe in layer, rigid layer structure (A), glue together between weaker zone structure (B) and reinforced layer structure (C) and form,

The mathematic(al) representation of the geometrical relationship of rigid layer structure (A), weaker zone structure (B) and reinforced layer structure (C) is:

$\left\{\begin{array}{c}{W}_P=0.382\&times;R\\ w_A=w_{B1}\\ w_C=0.224\&times;w_A\\ W_P=w_A+{\mathrm{\&Sigma;}}_{i=1}^n{w}_{\mathrm{Bi}}+{\mathrm{nw}}_C\end{array}\right.---\left(1\right)$

Weaker zone structure (B) by the mathematic(al) representation of rigid layer structure (A) each layer thickness relation is inwards:

$\left\{\begin{array}{c}q=0.77\\ w_{\mathrm{Bi}}=w_{B1}\&times;q^{i-1}\\ {\mathrm{\&Sigma;}}_{i=1}^n{w}_{\mathrm{Bi}}=\frac{w_{B1}\&times;(1-q^n)}{1-q}\end{array}\right.---\left(2\right)$

In mathematic(al) representation (1) and (2): W _pfor bionical compound tube wall total thickness; The outer radius of R corresponding to bionical compound tube wall; N is the number of plies of weaker zone structure (B) or reinforced layer structure (C), and 0<n≤10; w _afor the thickness of rigid layer structure (A); w _bifor weaker zone structure (B) thickness of i-th layer from outside to inside; w _cfor the thickness of every layer, reinforced layer structure (C); Q is the common ratio of Geometric Sequence.

2., by the bionical composite pipe that can improve anti-twisting property according to claim 1, it is characterized in that the material of described rigid layer structure (A) is: Q235B steel and aluminum alloy.

3., by the bionical composite pipe that can improve anti-twisting property according to claim 1, it is characterized in that the material of described weaker zone structure (B) is: closed-cell aluminum foam and closed cell foamed ceramics.

4., by the bionical composite pipe that can improve anti-twisting property according to claim 1, it is characterized in that the material of described reinforced layer structure (C) is: fiber-reinforced resin matrix compound material and fiber reinforced aluminum matrix composites.