CN103678833B - The non-computational methods waiting structure superposition valve block radial stress of vehicle shock absorber - Google Patents

Abstract

The present invention relates to the non-computational methods waiting structure superposition valve block radial stress of vehicle shock absorber, belong to absorber technical field, it is characterized in that: according to thickness and sheet number, inner circle and the exradius of non-structure superposition valve block such as grade, determine each non-grade the outer radius diversity factor coefficient of structure superposition valve block, equivalent depth, equivalent thicknessh _EAnd thickness proportion coefficientk _hi ；Structural parameters according to the 1st superposition valve block and material characteristic parameter, calculate the non-radial stress coefficient waiting structure superposition valve blockG _σr ；Thus realize the calculating of radial stress at the non-structure superposition valve block any radius under well-distributed pressure such as grade.By example calculation and ANSYS simulating, verifying: the method is correct, check for the non-fractionation design waiting structure superposition valve block of vehicle shock absorber and stress intensity, provide reliable radial stress computational methods, meet vibration-damper characterist and stress intensity design requirement, design level, quality and performance can be improved, reduce design, testing expenses and production cost.

Description

The non-computational methods waiting structure superposition valve block radial stress of vehicle shock absorber

Technical field

The present invention relates to shock absorber, particularly the non-computational methods waiting structure superposition valve block radial stress of vehicle shock absorber.

Background technology

Shock absorber in order to meet the requirement of production technology, be mostly use inside radius and outer radius equal etc. structure Sandwich plate valve Sheet, for vehicle shock absorber in order to meet characteristic and the requirement of valve block stress intensity, uses non-structure superposition valve block of Denging, i.e. sometimes Inside radius is equal and outer radius unequal superposition valve block；Meanwhile, non-structure superposition valve block such as grade reasonable in design is used, it is also possible to exempt from With a maximum limit position clearance ring, therefore, production cost can be reduced further.Really to realize vehicle shock absorber structure such as non-grade to fold Add the design of valve block, it is necessary to set up non-structure superposition valve block calculation method for stress of Denging, including radial stress, circumferential stress and compound should The calculating of power, wherein, radial stress can cause valve block to fix end at valve block at inside radius rupture failure occur.Although China is to subtracting Device superposition valve block Stress calculation of shaking has carried out numerous studies, but simply equity structure superposition valve block is studied, and such as, Shandong is managed Work university once gave the computational methods of the structure superposition valve block stress such as shock absorber.But, current home and abroad is for vehicle shock absorber Non-wait structure superposition valve block radial stress calculate the most never provide simplicity, reliable computational methods, mostly only with ANSYS finite element emulation software, by setting up entity simulation model, waits structure superposition valve block radial stress to carry out numerical simulation to non- Calculate, obtain the radial stress value of approximation, but, owing to finite element emulation software can not provide calculating formula, it is thus impossible to meet Vehicle shock absorber actual design and production and the requirement of strength check.Along with the fast development of auto industry and travel speed not Disconnected improve, shock absorber and superposition valve block are designed and has higher requirement, vehicle shock absorber to be realized and the structure Sandwich plate valve such as non- The modernization CAD design of sheet and strength check, it is necessary to a kind of reliable non-calculating side waiting structure superposition valve block radial stress is provided Method, and the radial stress calculating formula of valve block radial position can be given, thus meet shock absorber and the structure superposition valve block such as non- The requirement of actual design, production and strength check, improves the design level of shock absorber, quality and performance, reduces design and test Expense and production cost.

Summary of the invention

For defect present in above-mentioned prior art, the technical problem to be solved be to provide a kind of easy, The non-computational methods waiting structure superposition valve block radial stress of vehicle shock absorber reliably, its calculation process is as shown in Figure 1.

In order to solve above-mentioned technical problem, vehicle shock absorber provided by the present invention structure superposition valve block radial stress such as non-grade Computational methods, the non-mechanical model waiting superposition valve block is as in figure 2 it is shown, its technical scheme enforcement step is as follows:

(1) each non-outer radius diversity factor coefficient η waiting structure superposition valve block of vehicle shock absorber is determined_i:

According to non-outer radius r waiting structure superposition valve block of vehicle shock absorber_b1,r_b2,…,r_bn, wherein, r_b1>r_b2>…>r_bn, interior Radius r_a, determine the outer radius diversity factor coefficient η of each superposition valve block_i, that is:

η₁=0,

(2) each non-equivalent depth h waiting structure superposition valve block of vehicle shock absorber is calculated_ie:

According to each non-thickness h waiting structure superposition valve block of vehicle shock absorber₁,h₂,…,h_n, and the outer radius in step (1) is not Deng rate coefficient η_i, calculate each non-equivalent depth h waiting structure superposition valve block_ie, it may be assumed that

h_1e=h₁,

(3) the non-equivalent thickness h waiting structure superposition valve block is calculated_EWith thickness proportion coefficient k_hi:

According to the non-sheet number n waiting structure superposition valve block₁, n₂..., n_n, and the equivalent depth of each superposition valve block in step (2) h_ie, calculate the non-equivalent thickness h waiting structure superposition valve block of vehicle shock absorber_EThickness proportion coefficient k with each superposition valve block_hi, it may be assumed that

$h_E=\sqrt[3]{n_1{h}_{1e}^3+n_2{h}_{2e}^3+\mathrm{...}+n_n{h}_{ne}^3};$

k_h1=h_1e/h_E, k_h2=h_2e/h_E..., k_hn=h_ne/h_E；

(4) the non-radial stress coefficient G waited at structure superposition valve block meaning in office radius r of vehicle shock absorber_σrCalculate:

According to the 1st non-inside radius r waiting structure superposition valve block_a, outer radius r_b1, elastic modulus E and Poisson's ratio μ, calculate vapour The non-radial stress coefficient G waited at structure superposition valve block meaning in office radius r of car shock absorber_σr, it may be assumed that

r_a≤r≤r_b1；

In formula, G₁=3 (1-μ²)(E₁/r+2E₂rlnr+E₂r+2E₃r+4r³)/16,

G₂=3 (1-μ²)(-E₁/r²+2E₂lnr+3E₂+2E₃+12r²)/16；

$E_2=-8r_{b1}^2,E_3=\frac{(A_1{E}_2{B}_2+A_1{B}_4-B_1{E}_2{A}_2-B_1{A}_4)}{B_1{A}_3-A_1{B}_3},E_1=-\frac{A_4+E_2{A}_2+E_3{A}_3}{A_1},$

$E_4=-(r_a^4-E_1\ln r_a+E_2{r}_a^2\ln r_a+E_3{r}_a^2),$

A₂=2r_a lnr_a+r_a, A₃=2r_a,B₂=2 (μ+1) lnr_b1+ μ+3, B₃=2 (μ+1),

Wherein, r=r is worked as_aRadial stress coefficient G_σr, it is non-structure superposition valve block such as grade at inside radius r_aThe maximum radial at place Stress coefficient G_σrmax, it may be assumed that

$G_{\mathrm{\σ}rmax}=\frac{(r_a{G}_2+{\mathrm{\μG}}_1)}{2(1-{\mathrm{\μ}}^2)r_a},$

In formula,

$G_2=3(1-{\mathrm{\μ}}^2)(-E_1/r_a^2+2E_2\ln r_a+3E_2+2E_3+12r_a^2)/16;$

(5) each non-structure superposition valve block radial stress σ such as grade of vehicle shock absorber_rhiCalculating:

According to the non-pressure p waited suffered by structure superposition valve block of vehicle shock absorber, the equivalent thickness h in step (3)_EWith thickness ratio Example coefficient k_hi, and the radial stress coefficient G in step (4)_σr, non-grade structure superposition valve block in office meaning radius r each to vehicle shock absorber Radial stress amount σ at place_rhiCalculate, it may be assumed that

r_a≤r≤r_b1；

Wherein, G is worked as_σrFor inside radius r_aThe maximum radial stress coefficient G at place_σrmax, then σ_rhiIt is non-superimposed valve block h_iOutside The maximum radial stress σ of radial position_rhimax。

The present invention has the advantage that than prior art:

At present, both at home and abroad to vehicle shock absorber non-wait structure superposition valve block radial stress calculate never be given simplicity, Computational methods reliably, mostly only with ANSYS finite element emulation software, by setting up entity simulation model, wait structure to non- Superposition valve block radial stress carries out numerical simulation calculating, obtains the radial stress value of approximation, but, due to finite element emulation software Calculating formula or computational methods can not be provided, it is thus impossible to meet wanting of vehicle shock absorber actual design and production and characteristic Simulation Ask.The structure superposition valve blocks such as the present invention is identical for material behavior, inside radius is equal, the unequal vehicle shock absorber of outer radius is non-, First, according to the non-thickness waiting structure superposition valve block and sheet number, inside radius, determine each non-outer radius waiting structure superposition valve block Rate coefficient η_iWith equivalent depth h_ie, and calculate the equivalent thickness h of the structure superposition valve block such as non-_EAnd the thickness proportion of each superposition valve block Coefficient k_hi；Then, according to the inside radius r of the 1st superposition valve block_a, outer radius r_b1, elastic modulus E and Poisson's ratio μ, calculate non- The radial stress coefficient G gone out Deng structure superposition valve block meaning in office radius r_σr；Subsequently, according to the non-equivalent thickness waiting structure superposition valve block h_E, thickness proportion coefficient k_hi, suffered pressure p and radial stress coefficient G_σr, utilizeTo vehicle shock absorber The non-radial stress waiting structure superposition valve block calculates.The method can wait structure superposition valve block meaning in office half to vehicle shock absorber is non- Radial stress at path position calculates, and can at superposition valve block at inside radius r_aThe maximum radial stress of position enters Row calculates.By comparing with ANSYS simulation result, the non-calculating side waiting structure superposition valve block radial stress of this vehicle shock absorber Method is correct, checks for the non-fractionation design waiting structure superposition valve block of actual vehicle shock absorber and stress intensity, it is provided that reliable Non-wait structure superposition valve block radial stress computational methods, make shock absorber not only meet characteristics design requirement, the most also meet joint The design requirement of stream valve block stress intensity, can improve the design level of vehicle shock absorber, quality and performance, reduces design and test Expense and production cost.

Accompanying drawing explanation

In order to be more fully understood that the present invention is further described below in conjunction with the accompanying drawings.

Fig. 1 is the non-computational methods flow chart waiting structure superposition valve block radial stress of vehicle shock absorber；

Fig. 2 is the non-mechanical model waiting structure superposition valve block of vehicle shock absorber；

Fig. 3 is the non-radial stress coefficient waiting structure superposition valve block of vehicle shock absorber of embodiment one；

Fig. 4 is the non-radial stress curve waiting structure superposition valve block of vehicle shock absorber of embodiment one；

Fig. 5 is the vehicle shock absorber structure superposition valve block radial stress emulation cloud atlas curve such as non-grade of embodiment one；

Fig. 6 is the non-radial stress curve waiting structure superposition valve block of vehicle shock absorber of embodiment two；

Fig. 7 is the non-radial stress emulation cloud atlas waiting structure superposition valve block of vehicle shock absorber of embodiment two；

Fig. 8 is the non-radial stress curve waiting structure superposition valve block of vehicle shock absorber of embodiment three；

Fig. 9 is the non-radial stress emulation cloud atlas waiting structure superposition valve block of vehicle shock absorber of embodiment three.

Specific embodiments

Below by embodiment, the present invention is described in further detail.

Embodiment one: the non-inside radius r waiting structure superposition valve block of certain vehicle shock absorber_a=5.0mm, elastic modulus E= 200GPa, Poisson's ratio μ=0.3, the thickness of superposition valve block, sheet number and outer radius are respectively h₁=0.25mm, n₁=1, r_b1= 8.5mm；h₂=0.20mm, n₂=1, r_b2=7.0mm；h₃=0.15mm, n₃=1, r_b3=6.0mm；Superposition valve block pressure p= 3.0MPa, calculates non-structure superposition valve block radial stress of Denging.

(1) each non-outer radius diversity factor coefficient η waiting structure superposition valve block is determined_i:

According to non-outer radius r waiting structure superposition valve block of vehicle shock absorber_b1=8.5mm, r_b2=7.0mm, r_b3=6.0mm, interior Radius r_a=5.0mm, determines the outer radius diversity factor coefficient η of each superposition valve block_i, that is:

η₁=0,

(2) each non-equivalent depth h waiting structure superposition valve block is calculated_ie:

According to each non-thickness h waiting structure superposition valve block of vehicle shock absorber₁=0.25mm, h₂=0.20mm, h₃=0.15mm, And the outer radius diversity factor coefficient η in step (1)₁=0, η₂=0.4286, η₃=0.7143, calculate structure superposition such as each non-grade respectively Equivalent depth h of valve block_ie, it may be assumed that

h_1e=0.25mm,

(3) the non-equivalent thickness h waiting structure superposition valve block is calculated_EWith thickness proportion coefficient k_hi

According to the non-equivalent depth waiting structure superposition valve block of certain vehicle shock absorber and and sheet number h_1e=0.25mm, n₁=1；h_2e= 0.19206mm, n₂=1；h_3e=0.15mm, n₃=1, calculate the non-equivalent thickness h waiting structure superposition valve block_EFor:

$h_E=\sqrt[3]{n_1{h}_{1e}^3+n_2{h}_{2e}^3+n_3{h}_{3e}^3}=\sqrt[3]{{0.25}^3+{0.19206}^3+{0.2227}^3}=0.29059mm;$

Each non-thickness proportion coefficient k waiting structure superposition valve block_hiIt is respectively；

k_h1=h_1e/h_E=0.8603, k_h2=h_2e/h_E=0.6609, k_h3=h_3e/h_E=0.4208；

(4) the non-radial stress coefficient G waiting structure superposition valve block meaning in office radius r is calculated_σr:

Inside radius r according to the 1st superposition valve block_a=5.0mm, outer radius r_b1=8.5mm, elastic modulus E=2.0 × 10¹¹Pa and Poisson's ratio μ=0.3, calculate the non-radial stress coefficient G waiting structure superposition valve block meaning in office radius r_σr, it may be assumed that

r_a≤r≤r_b1；

In formula, G₁=3 (1-μ²)(E₁/r+2E₂rlnr+E₂r+2E₃r+4r³)/16,

G₂=3 (1-μ²)(-E₁/r²+2E₂lnr+3E₂+2E₃+12r²)/16；

$E_2=-8r_{b1}^2=-5.78\×{10}^{-4},E_3=\frac{(A_1{E}_2{B}_2+A_1{B}_4-B_1{E}_2{A}_2-B_1{A}_4)}{B_1{A}_3-A_1{B}_3}=-2.457\×{10}^{-3},$

$E_1=-\frac{A_4+E_2{A}_2+E_3{A}_3}{A_1}=-1.83134\×{10}^{-8},$

$E_4=-(r_a^4-E_1{\mathrm{lnr}}_a+E_2{r}_a^2\ln r_a+E_3{r}_a^2)=-1.127869\×{10}^{-7};$

A₁=1/r_a=200, A₂=2r_a lnr_a+r_a=-0.048, A₃=2r_a=0.01, B₂=2 (μ+1) lnr_b1+ μ+3=-9.096, B₃=2 (μ+1)=2.6,

Calculated radial stress coefficient G_σrWith the change curve of radius r, as it is shown on figure 3, wherein, at inside radius r_aPlace Maximum radial stress coefficient G_σrmax=47.726mm²；

(5) each non-structure superposition valve block radial stress σ such as grade of vehicle shock absorber_rhiCalculating:

According to the pressure p=3.0MPa suffered by superposition valve block, the equivalent thickness h of the superposition valve block in step (3)_E= 0.29059mm and thickness proportion coefficient k_h1=0.8603, k_h2=0.6609, k_h3Radial direction in=0.4208, and step (4) should Force coefficient G_r, to each non-radial stress σ waited at structure superposition valve block meaning in office radius r_rhiCalculate, it may be assumed that

r_a≤r≤r_b1；

Each non-radial stress σ waiting structure superposition valve block obtained by calculating_rhiCurve, as shown in Figure 4, wherein, each non-structure such as grade The maximum radial stress of superposition valve block is respectively σ_rmax1=1458.8MPa, σ_rmax2=1120.7MPa, σ_rmax3=713.42MPa.

According to the non-inside radius r waiting structure superposition valve block of vehicle shock absorber_a=5.0mm, elastic modulus E=200GPa, Poisson Ratio μ=0.3, and each thickness of structure superposition valve block, sheet number and the outer radius such as non-be respectively h₁=0.25mm, n₁=1, r_b1= 8.5mm；h₂=0.20mm, n₂=1, r_b2=7.0mm；h₃=0.15mm, n₃=1, r_b3=6.0mm, utilizes ANSYS to set up superposition Valve block simulation model, stress and strain model unit is 0.1mm, in the case of applying identical well-distributed pressure p=3.0MPa, obtained by emulation Superposition valve block radial stress emulation cloud atlas, as shown in Figure 5.

As shown in Figure 5, under well-distributed pressure p=3.0MPa, this vehicle shock absorber is non-waits structure superposition valve block maximum radial to answer The simulation value of power is 1370MPa, with the 1st maximum radial stress superposing valve block utilized obtained by these computational methods 1458.8MPa matches, and relative deviation is only 6.09%, shows the vehicle shock absorber structure superposition valve block such as non-grade that the present invention is set up The computational methods of radial stress are reliable.

Embodiment two: the non-inside radius r waiting structure superposition valve block of certain vehicle shock absorber_a=5.0mm, elastic modulus E= 200GPa, Poisson's ratio μ=0.3, the thickness of superposition valve block, sheet number and outer radius are respectively h₁=0.30mm, n₁=1, r_b1= 8.5mm；h₂=0.20mm, n₂=1, r_b2=7.0mm, non-waits well-distributed pressure p=3.0MPa suffered by structure superposition valve block.Calculate this vapour The non-radial stress waiting structure superposition valve block of car shock absorber.

Calculate by the step of embodiment one, it may be assumed that

(1) each non-outer radius diversity factor coefficient η waiting structure superposition valve block is determined_i:

According to non-outer radius r waiting structure superposition valve block of vehicle shock absorber_b1=8.5mm, r_b2=7.0mm, inside radius r_a= 5.0mm, determines the outer radius diversity factor coefficient η of each superposition valve block_i, i.e.

η₁=0,

(2) each non-equivalent depth h waiting structure superposition valve block is calculated_ie:

According to each non-thickness h waiting structure superposition valve block of vehicle shock absorber₁=0.30mm, h₂In=0.20mm, and step (1) Outer radius diversity factor coefficient η₁=0, η₂=0.4286, calculate each non-equivalent depth h waiting structure superposition valve block respectively_ie, it may be assumed that

h_1e=0.30mm,

(3) the non-equivalent thickness h waiting structure superposition valve block is calculated_EWith thickness proportion coefficient k_hi:

According to the non-equivalent depth waiting structure superposition valve block of certain vehicle shock absorber and and sheet number h_1e=0.30mm, n₁=1；h_2e= 0.19312mm, n₂=1, calculate the non-equivalent thickness h waiting structure superposition valve block_EFor:

$h_E=\sqrt[3]{n_1{h}_{1e}^3+n_2{h}_{2e}^3}=\sqrt[3]{{0.30}^3+{0.19312}^3}=0.3246mm;$

Each non-thickness proportion coefficient k waiting structure superposition valve block_hiIt is respectively；

k_h1=h_1e/h_E=0.9242, k_h2=h_2e/h_E=0.5949；

(4) the non-radial stress coefficient G waiting structure superposition valve block meaning in office radius r is calculated_σr:

Owing to the 1st non-is waited the structure of structure superposition valve block, material behavior identical with embodiment one, therefore, this automobile subtracts The non-radial stress coefficient G waiting structure superposition valve block meaning in office radius r of the device that shakes_σr, also identical with embodiment one, as shown in Figure 3；

(5) each non-structure superposition valve block radial stress σ such as grade of vehicle shock absorber_rhiCalculating:

According to the non-pressure p=3.0MPa waited suffered by structure superposition valve block of vehicle shock absorber, the superposition valve block etc. in step (3) Effect thickness h_EThe thickness proportion coefficient k of the structure superposition valve block such as=0.3246mm and Ge Fei_h1=0.9242, k_h2=0.5949, and step Suddenly the radial stress coefficient G in (4)_σr, to each non-radial stress σ waited at structure superposition valve block meaning in office radius r_rhiCalculate, That is:

r_a≤r≤r_b1；

Each non-radial stress σ waiting structure superposition valve block obtained by calculating_rhiCurve, as shown in Figure 6, wherein, each non-structure such as grade The maximum radial stress of superposition valve block is respectively σ_rmax1=1255.9MPa, σ_rmax2=808.43MPa.

According to the non-inside radius r waiting structure superposition valve block of vehicle shock absorber_a=5.0mm, elastic modulus E=200GPa, Poisson Ratio μ=0.3, and each thickness of structure superposition valve block, sheet number and the outer radius such as non-be respectively h₁=0.30mm, n₁=1, r_b1= 8.5mm；h₂=0.20mm, n₂=1, r_b2=7.0mm, utilizes ANSYS to set up superposition valve block simulation model, and stress and strain model unit is 0.1mm, in the case of applying identical well-distributed pressure p=3.0MPa, the superposition valve block radial stress emulation cloud atlas obtained by emulation, As shown in Figure 7.

As shown in Figure 7, under well-distributed pressure p=3.0MPa, this vehicle shock absorber is non-waits structure superposition valve block maximum radial to answer The simulation value of power is 1220MPa, with the 1st maximum radial stress superposing valve block utilized obtained by these computational methods 1255.9MPa matches, and relative deviation is only 2.86%, shows the vehicle shock absorber structure superposition valve block such as non-grade that the present invention is set up The computational methods of radial stress are reliable.

Embodiment three: the non-inside radius r waiting structure superposition valve block of certain vehicle shock absorber_a=5.0mm, elastic modulus E= 200GPa, Poisson's ratio μ=0.3, the thickness of superposition valve block, sheet number and outer radius are respectively h₁=0.20mm, n₁=1, r_b1= 8.5mm；h₂=0.15mm, n₂=1, r_b2=7.0mm, non-structure superposition valve block pressure p=2.5MPa such as grade.Calculate this automobile to subtract The non-radial stress waiting structure superposition valve block of the device that shakes.

Calculate by the step of embodiment one, it may be assumed that

(1) each non-outer radius diversity factor coefficient η waiting structure superposition valve block is determined_i:

According to non-outer radius r waiting structure superposition valve block of vehicle shock absorber_b1=8.5mm, r_b2=7.0mm, inside radius r_a= 5.0mm, determines the outer radius diversity factor coefficient η of each superposition valve block_i, i.e.

η₁=0,

(2) each non-equivalent depth h waiting structure superposition valve block is calculated_ie:

According to each non-thickness h waiting structure superposition valve block of vehicle shock absorber₁=0.20mm, h₂In=0.15mm, and step (1) Outer radius diversity factor coefficient η₁=0, η₂=0.4286, calculate each non-equivalent depth h waiting structure superposition valve block respectively_ie, i.e.

h_1e=0.20mm,

(3) the non-equivalent thickness h waiting structure superposition valve block is calculated_EWith thickness proportion coefficient k_hi:

According to the non-equivalent depth waiting structure superposition valve block of certain vehicle shock absorber and and sheet number h_1e=0.30mm, n₁=1；h_2e= 0.19312mm, n₂=1, calculate the non-equivalent thickness h waiting structure superposition valve block_EFor:

$h_E=\sqrt[3]{n_1{h}_{1e}^3+n_2{h}_{2e}^3}=\sqrt[3]{{0.2}^3+{0.14438}^3}=0.2224mm;$

Each non-thickness proportion coefficient k waiting structure superposition valve block_hiIt is respectively as follows:

k_h1=h_1e/h_E=0.899, k_h2=h_2e/h_E=0.649；

(4) the non-radial stress coefficient G waiting structure superposition valve block meaning in office radius r is calculated_σr:

Owing to the 1st non-is waited the structure of structure superposition valve block, material behavior identical with embodiment one, therefore, this automobile subtracts The non-radial stress coefficient G waiting structure superposition valve block meaning in office radius r of the device that shakes_σr, also identical with embodiment one, as shown in Figure 3；

(5) each non-structure superposition valve block radial stress σ such as grade of vehicle shock absorber_rhiCalculating:

According to the pressure p=2.5MPa suffered by superposition valve block, the superposition valve block equivalent thickness h in step (3)_E= The thickness proportion coefficient k of the structure superposition valve blocks such as 0.2224mm and Ge Fei_h1=0.899, k_h2Footpath in=0.649, and step (4) To stress coefficient G_σr, to non-radial stress σ waited at structure superposition valve block meaning in office radius r_rhiCalculate, it may be assumed that

ra≤r≤rb1；

Non-radial stress σ waiting structure superposition valve block obtained by calculating_rCurve, as shown in Figure 8, wherein, structure superposition such as non-grade Valve block maximum radial stress at inside radius is respectively σ_rmax1=2167.5MPa, σ_rmax2=1564.7MPa.

According to the non-inside radius r waiting structure superposition valve block of vehicle shock absorber_a=5.0mm, elastic modulus E=200GPa, Poisson Ratio μ=0.3, and each thickness of structure superposition valve block, sheet number and the outer radius such as non-be respectively h₁=0.20mm, n₁=1, r_b1= 8.5mm；h₂=0.15mm, n₂=1, r_b2=7.0mm, utilizes ANSYS to set up superposition valve block simulation model, and stress and strain model unit is 0.1mm, in the case of applying identical well-distributed pressure p=2.5MPa, the superposition valve block radial stress emulation cloud atlas obtained by emulation, As shown in Figure 9.

As shown in Figure 9, under well-distributed pressure p=2.5MPa, this vehicle shock absorber is non-waits structure superposition valve block maximum radial to answer The simulation value of power is 2100MP, with the 1st maximum radial stress superposing valve block utilized obtained by these computational methods 2167.5MP matches, and relative deviation is only 3.1%, shows the structure superposition valve block footpath such as vehicle shock absorber non-grade that the present invention is set up It is reliable to the computational methods of stress.

Claims (1)

1. the non-computational methods waiting structure superposition valve block radial stress of vehicle shock absorber, its concrete calculation procedure is as follows:

(1) each non-outer radius diversity factor coefficient η waiting structure superposition valve block of vehicle shock absorber is determined_i:

According to non-outer radius r waiting structure superposition valve block of vehicle shock absorber_b1,r_b2,…,r_bn, wherein, r_b1>r_b2>…>r_bn, inside radius r_a, determine the outer radius diversity factor coefficient η of each superposition valve block_i, that is:

η₁=0,

(2) each non-equivalent depth h waiting structure superposition valve block of vehicle shock absorber is calculated_ie:

According to each non-thickness h waiting structure superposition valve block of vehicle shock absorber₁,h₂,…,h_n, and the outer radius diversity factor in step (1) Coefficient η_i, calculate each non-equivalent depth h waiting structure superposition valve block_ie, it may be assumed that

h_1e=h₁, (3) the non-equivalent thickness h waiting structure superposition valve block is calculated_EWith thickness proportion coefficient k_hi:

According to the non-sheet number n waiting structure superposition valve block₁, n₂..., n_n, and equivalent depth h of each superposition valve block in step (2)_ie, meter Calculate the non-equivalent thickness h waiting structure superposition valve block of vehicle shock absorber_EThickness proportion coefficient k with each superposition valve block_hi, it may be assumed that

$h_E=\sqrt[3]{n_1{h}_{1e}^3+n_2{h}_{2e}^3+...+n_n{h}_{ne}^3};$

k_h1=h_1e/h_E, k_h2=h_2e/h_E, k_hi=h_ie/h_E..., k_hn=h_ne/h_E；

(4) the non-radial stress coefficient G waited at structure superposition valve block meaning in office radius r of vehicle shock absorber_σrCalculate:

According to the 1st non-inside radius r waiting structure superposition valve block_a, outer radius r_b1, elastic modulus E and Poisson's ratio μ, calculate automobile and subtract The non-radial stress coefficient G waited at structure superposition valve block meaning in office radius r of the device that shakes_σr, it may be assumed that

$G_{\mathrm{\σ}r}=\frac{({\mathrm{rG}}_2+{\mathrm{\μG}}_1)}{2(1-{\mathrm{\μ}}^2)r},r_a\≤r\≤r_{b1};$

In formula, G₁=3 (1-μ²)(E₁/r+2E₂rlnr+E₂r+2E₃r+4r³)/16,

G₂=3 (1-μ²)(-E₁/r²+2E₂lnr+3E₂+2E₃+12r²)/16；

$E_2=-8r_{b1}^2,E_3=\frac{(A_1{E}_2{B}_2+A_1{B}_4-B_1{E}_2{A}_2-B_1{A}_4)}{B_1{A}_3-A_1{B}_3},E_1=-\frac{A_4+E_2{A}_2+E_3{A}_3}{A_1},$

$E_4=-(r_a^4-E_1\ln r_a+E_2{r}_a^2\ln r_a+E_3{r}_a^2),$

A₂=2r_alnr_a+r_a, A₃=2r_a,B₂=2 (μ+1) lnr_b1+ μ+3, B₃=2 (μ+1),

Wherein, r=r is worked as_aRadial stress coefficient G_σr, it is non-structure superposition valve block such as grade at inside radius r_aThe maximum radial stress at place Coefficient G_σrmax, it may be assumed that

$G_{\mathrm{\σ}rmax}=\frac{(r_a{G}_2+{\mathrm{\μG}}_1)}{2(1-{\mathrm{\μ}}^2)r_a};$

In formula,

$G_2=3(1-{\mathrm{\μ}}^2)(-E_1/r_a^2+2E_2\ln r_a+3E_2+2E_3+12r_a^2)/16;$

(5) each non-structure superposition valve block radial stress σ such as grade of vehicle shock absorber_rhiCalculating:

According to the non-pressure p waited suffered by structure superposition valve block of vehicle shock absorber, the equivalent thickness h in step (3)_EWith thickness proportion system Number k_hi, and the radial stress coefficient G in step (4)_σr, at non-structure superposition valve block meaning in office radius r such as grade each to vehicle shock absorber Radial stress amount σ_rhiCalculate, it may be assumed that

${\mathrm{\σ}}_{rhi}=k_{hi}{G}_{\mathrm{\σ}r}\frac{p}{h_E^2},r_a\≤r\≤r_{b1};$

Wherein, G is worked as_σrFor inside radius r_aThe maximum radial stress coefficient G at place_σrmax, then σ_rhiIt is non-superimposed valve block h_iIn outer radius The maximum radial stress σ of position_rhimax。