含缺陷变刚度层合板屈曲性能的数值分析方法

doi:10.7527/S1000-6893.2023.28576

Abstract

Abstract:

To consider the effects of gaps and overlaps on the buckling performance of variable stiffness laminates， the defect proportion was used to characterize the degree of material defects in the local area at first. Then， a simplified model for the material with defects was proposed based on the Representative Volume Element （RVE）， and a computational method for material properties considering defects was established. After that， the binary image method was used to identify the location and percentage of defects of the elements in the finite element model. Based on the computational method proposed， different elements were given different properties. Finally， the buckling performance was calculated by the finite element model. A comparison with the experimental results shows that the buckling performance obtained with the proposed method is in good agreement with the experimental results， and the accuracy of the prediction results is within 7%. In addition， the accuracy of the method is less affected by the mesh size， so the computational expense can be effectively reduced.

Key words: variable stiffness laminate, manufacturing defect, Representative Volume Element (RVE), defect proportion, buckling

CLC Number:

V258.3

Yan HUANG, Zhe WANG, Puhui CHEN. Numerical analysis method for buckling behavior of variable stiffness laminates with defects[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(24): 428576-428576.

Figures/Tables 20

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参数	弹性模量/GPa			泊松比ν₁₂
参数	E₁	E₂	G₁₂	泊松比ν₁₂
数值	129.8	9.2	5.1	0.36
参数	热膨胀系数/10^-7 K^-1
参数	α₁		α₂
数值	-3.42		344.0

方法	不含重叠缺陷		含重叠缺陷
方法	载荷/kN	误差/%	载荷/kN	误差/%
试验值^［13］	40.92		60.49
Wu方法^［13］	37.81	-7.60	56.93	-5.89
方案1	41.25	0.81	57.00	-5.77
方案2	41.30	0.93	56.70	-6.27
方案3	41.40	1.17	56.72	-6.23

试件结构	试验载荷/kN	预测载荷/kN	误差/%
平板^{［27，36］}	97.9	101.6	3.78
开孔板1^{［27，36］}	89.6	93.1	3.91
开孔板2^［37］	19.7	20.8	5.58
开孔板3^［37］	29.1	27.1	-6.87

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Numerical analysis method for buckling behavior of variable stiffness laminates with defects

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