近零应力等效温度场驱动的CFRP复杂构件固化变形控制方法

doi:10.7527/S1000-6893.2023.29703

Abstract

Abstract:

The cure-induced distortion of Carbon Fiber Resin Matrix Composite （CFRP） components directly affects the mechanical properties and service life of the components after assembly. However， the cure-induced distortion control methods such as tool compensation and structure optimization have the problems of long process cycle time and high cost of iteration. Selective heating methods， such as microwave heating and self-resistive heating， have the potential to realize precise control of the curing temperature field， and generate thermal stresses to hedge the original cure-induced distortion by constructing an uneven temperature field. In this paper， the typical inverse problem of how to construct an inhomogeneous temperature field， a quasi “zero-stress” equivalent temperature field is derived and defined， which in principle can hedge the residual stress field of the component before demolding to achieve a quasi “zero-stress” curing， and thus inhibit the curing deformation after demolding. An adaptive compression partitioning algorithm is designed to partition the theoretical equivalent temperature field with respect to the actual curing temperature process constraints. The method is preliminarily validated on typical hyperbolic and rotary parts， and the results show that compared with isothermal curing， the curing deformation and residual stress are reduced by nearly 50%； compared with the temperature field optimization method that only considers the curing deformation， the curing deformation and residual stress are also reduced by nearly 15%.

Key words: carbon fiber resin matrix composite, cure-induced distortion, regional temperature field, image processing, distortion control

CLC Number:

V258⁺.3

Guanguan CAO, Ke XU. Optimized distortion control method of CFRP curing region temperature field driven by near⁃zero stress equivalent temperature field[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(16): 429703-429703.

Figures/Tables 14

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Table 1

QY9611 resin curing kinetics parameters［27］

参数	数值
频率因子 $A /$ （10⁷ $m i n - 1$ ）	2.28
活化能∆E/（10⁴ J∙ $m o l - 1$ ）	9.241
气体常数R/（J∙ $m o l - 1$ ∙ $K - 1$ ）	8.314
反应常数n	1.485

Table 1

Table 2

T700/QY9611 CFRP RVE element parameters［27］

参数	橡胶态	玻璃态
沿纤维方向弹性模量E1/MPa	38 691.037	58 425.422
垂直纤维方向弹性模量E2/MPa	42 102.122	61 709.779
厚度方向弹性模量E3/MPa	248.968	11 842.532
面内剪切模量G12/MPa	8 374.396	20 261.931
面内剪切模量G13/MPa	44.405	3 988.572
垂直剪切模量G23/MPa	44.835	4 078.428
面内泊松比v12	0.094 8	0.259 6
面内泊松比v13	0.511 4	0.307 3
垂直泊松比v23	0.504 4	0.301 7
沿纤维方向热膨胀系数 $β 1$ /（ $μ ε ∙ ℃ - 1$ ）		4.071 7
垂直纤维方向热膨胀系数 $β 2$ /（ $μ ε ∙ ℃ - 1$ ）		3.653 1
厚度方向热膨胀系数 $β 3$ /（ $μ ε ∙ ℃ - 1$ ）		54.385 3
沿纤维方向化学收缩系数 $γ 1$ /‱	-1.903 5
垂直纤维方向化学收缩系数 $γ 2$ /‱	-1.881 7
厚度方向化学收缩系数 $γ 3$ /%	-1.392 1

Table 2

Fig.6

Fig.7

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Optimized distortion control method of CFRP curing region temperature field driven by near⁃zero stress equivalent temperature field

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