Mechanical performance of stiffened CFRP panel cured via magnetic particle-induced in-situ heating
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摘要: 随着碳纤维复合材料结构呈现出大型化、复杂化的发展趋势，常规的烘箱或热压罐成型工艺暴露出尺寸受限、成型周期长、能量利用率低、固化不均匀等问题，亟需探寻新型的复合材料成型工艺。本文以锰锌铁氧体作为加热载体，探究了一种基于电磁感应原位加热的碳纤维复合材料固化成型新工艺。着重研究了T字型与工字型两种复杂铺层的碳纤维复合材料加筋板的加热特性、力学性能与孔隙率，并与经烘箱固化的试样件进行了对比分析。结果显示，电磁感应方法对两种结构加筋板均可以实现原位、均匀、温度可控，且不受铺层角度影响的加热与固化成型。在添加13wt%锰锌铁氧体电磁加热5.5 h条件下，T字型加筋板的弯曲刚度较相同固化时间下烘箱成型试样件提升了5.2%，最大承载载荷提升了11.2%。工字型加筋板的屈曲载荷较烘箱成型试样件提升了3.3%。然而两种加筋板的孔隙率却略微增加了0.4%与0.3%。本文获得的研究结果为电磁感应固化工艺在复合材料结构成型方面的工程化应用提供了重要依据。Abstract: With the development trend of large and complexity of carbon fiber reinforced polymer (CFRP) structures, the conventional oven or autoclave molding method exposes problems such as size limitation, long fabrication time, low energy utilization, uneven curing, etc., and there is an urgent need to explore new composite molding method. In this paper, a new fabrication method to cure CFRP based on electromagnetic induction in-situ heating was investigated by using Mn-Zn ferrite as a heating carrier. The heating characteristics, mechanical properties and porosity of stiffened CFRP panels with two kinds of complex layups, T-shape and I-shape, were investigated, and comparative analyses were carried out with the counterpart specimens cured by an oven. The results show that the induction method can achieve in-situ, uniform, temperature-controlled and lay-up angle independent heating and curing for both two types panels. Under the condition of 13 wt% Mn-Zn ferrite addition and 5.5 hours induction heating, the flexural stiffness of the T-shaped panel is increased by 5.2% and the maximum load is increased by 11.2% compared to the oven-formed specimen under the same curing time. The buckling load of the I-beam reinforced panel increases by 3.3% compared to the oven-molded specimen. However, the porosity of the two types of panels increase slightly by 0.4% and 0.3%. The results obtained in this paper provide important guidance for the engineering application of electromagnetic induction curing process in the fabrication of CFRP composite structures.
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Key words:
- carbon fiber reinforced polymer (CFRP) /
- Mn-Zn ferrite /
- cure /
- mechanical property /
- porosity
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图 1 (a) T型结构加筋板的横截面尺寸及铺层角度；(b) 工字型加筋板的横截面尺寸及铺层角度
Figure 1. Cross-section geometry and ply sequence of T-shaped (a) and I-shaped (b) stiffened panel
图 2 (a) 碳纤维复合材料加筋板制作过程铺层方法示意图；(b) 实物图
Figure 2. (a) Stacking sequence for the fabrication of CFRP stiffened panel; (b) Prepared real picture
图 3 (a) 电磁感应加热原理图；(b)装置实物图
Figure 3. (a) Mechanism of induction heating method; (b) Real picture of the experimental setup
图 4 在有(a)无(b)磁性颗粒条件下T字型试样件电磁加热升温曲线图以及不同升温时刻试样表面温度场分布图
Figure 4. Induction heating curves and temperature fields of T-shape sample with (a) and without (b) magnetic particles
图 5 T字型加筋板单元切分法及相关参数标注
Figure 5. Segmentation labeling of T-shaped stiffened panel
di—Distance from component i’s central axis to panel’s neutral axis; bi—Width of component i; ti—Thickness of component i
图 6 经烘箱固化和电磁感应加热固化的T型加筋板三点弯曲载荷-位移曲线
Figure 6. Load-displacement curve of three-points bending of T-shaped stiffened panel cured by oven heating and induction heating
图 7 T型加筋板在烘箱固化与电磁固化条件下弯曲刚度对比图
Figure 7. Flexural stiffness of T-shaped stiffened panel cured by oven heating and induction heating
图 8 经烘箱固化和电磁感应加热固化的T型加筋板弯曲最大载荷与载荷最大处对应位移
Figure 8. Maximum bending load and displacement of T-shaped stiffened panel cured by oven heating and induction heating
图 9 经电磁感应加热固化(a)和烘箱固化(b)的T字型加筋板试样失效特征对比图
Figure 9. Failure characteristics of T-shaped stiffened panel cured by induction heating (a) and oven heating (b)
图 10 工字型加筋板单元切分法及相关参数标注
Figure 10. Segmentation labeling of I-shaped stiffened panel
di: Distance from component i’s central axis to panel’s neutral axis;bi: Width of component i; ti: Thickness of component i.
图 11 经烘箱固化和电磁感应加热固化的工字型加筋板三点弯曲载荷-位移曲线
Figure 11. Load-displacement curve of three-points bending of I-shaped stiffened panel cured by oven heating and induction heating
图 12 经烘箱固化和电磁感应加热固化的工字型加筋板弯曲最大载荷与载荷最大处对应位移
Figure 12. Maximum bending load and displacement of I-shaped stiffened panel cured by oven heating and induction heating
图 13 经电磁感应加热固化(a)和烘箱固化(b)的工字型加筋板试样失效特征对比图
Figure 13. Failure characteristics of I-shaped stiffened panel cured by induction heating (a) and oven heating (b)
图 14 T字型加筋板与工字型加筋板在两种固化工艺后的孔隙率结果图
Figure 14. Porosity of T-shaped and I-shaped stiffened panel cured by oven heating and induction heating
表 1 实验相关参数
Table 1. Parameters used in the experiment
Sample Type Loading Curing
timeCuring method MPs-CFRP T 13 wt% 5.5 h Induction heating:
0.7 mT(4 h)-0.9 mT(1.5 h)
Oven heating:
70°C(4 h)-120°C(1.5 h)I 
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表 2 T字型加筋板不同分割单元相关参数
Table 2. Parameters of different segments of T-shaped stiffened panel
No. b/mm t/mm d/mm Eb/GPa 1 20 2.4 9.6 75.5 2 70 1.2 1 13.35 3 70 2.4 2.8 62.1 Notes: d—Distance from component i’s central axis to panel’s neutral axis; B—Width of component i; t—Thickness of component i; Eb—Flexural modulus of component i.
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表 3 T字型加筋板不同分割单元相关参数
Table 3. Parameters of different segments of I-shaped stiffened panel
No. b/mm t/mm d/mm Eb/GPa 1 20 1.2 18.1 91.64 2 20 1.2 16.9 13.35 3 20 2.4 6.3 75.5 4 70 1.2 4.3 13.35 5 70 2.4 6.1 62.1
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