Compressive deformation behavior and energy absorption of Al foam-filled carbon fiber reinforced plastic thin-walled tube
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摘要: 将填加造孔剂法制备的泡沫铝物理嵌入碳纤维增强树脂(Carbon fiber reinforced plastic，CFRP)复合材料薄壁管中，从而获得泡沫铝填充CFRP复合材料薄壁管的复合结构。针对CFRP薄壁管、泡沫铝和泡沫铝填充CFRP复合材料薄壁管分别开展准静态压缩试验测试其压缩和吸能性能，并在压缩过程中采用数字图像相关技术(Digital image correlation，DIC)同步分析其变形模式；进一步研究在不同环境温度下(25~150℃)泡沫铝填充CFRP复合材料薄壁管的压缩与吸能性能及失效模式。结果表明：泡沫铝作为填充芯材改变了CFRP复合材料薄壁管的压缩变形行为，由单一CFRP复合材料薄壁管的散射开花失效转变为泡沫铝填充CFRP复合材料薄壁管的纤维层断裂失效。同CFRP复合材料薄壁管相比，泡沫铝填充CFRP复合材料薄壁管的应力波动显著减小。随环境温度的升高，CFRP复合材料薄壁管、泡沫铝和泡沫铝填充CFRP复合材料薄壁管的压缩与吸能性能均不断降低，但泡沫铝与CFRP复合材料薄壁管之间的交互作用增强，泡沫铝对CFRP复合材料薄壁管的增强作用在高温下表现更为显著。
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关键词:
- 泡沫铝填充CFRP复合材料薄壁管 /
- DIC /
- 温度压缩 /
- 吸能 /
- 变形模式
Abstract: The Al foams made by space-holder method were physically inserted into carbon fiber reinforced plastic (CFRP) composite thin-wall tubes to obtain the composite structure of Al foam-filled CFRP composite thin-wall tubes. Quasi-static compression tests of CFRP composite tubes, Al foams and Al foam-filled CFRP composite thin-wall tubes were carried out to study their compression properties. Meanwhile, digital image correlation (DIC) was applied to analyze their deformation modes. Furthermore, the compressive properties, energy absorption properties and failure modes of Al foam-filled CFRP composite thin-wall tubes at different temperatures (25-150℃) were studied. The results show that Al foams as fillers change the compression deformation behavior of CFRP composite thin-walled tubes from the scattering flowering failure of a single CFRP composite tube to the fiber layer fracture failure of a foam-filled tube. Comparing to CFRP composite thin-walled tubes, the stress fluctuations of Al foam-filled CFRP composite thin-wall tubes decrease obviously. With environmental temperature increasing, both the compressive properties and energy absorption properties of CFRP composite thin-walled tubes, Al foams and Al foam-filled CFRP composite thin-wall tubes decrease. But the interaction between Al foams and CFRP composite thin-walled tubes is enhanced, the enhancement effect of Al foams on CFRP composite thin-walled tubes is more obvious at high temperature. -
图 1 铝粉的SEM图像(a)、尿素颗粒(b)、泡沫铝上表面与侧剖面(c)和碳纤维增强树脂(CFRP)复合材料薄壁管和泡沫铝填充CFRP薄壁管(d)的宏观照片
Figure 1. SEM image of Al powders(a) and photos of carbamides(b), Al foam top and cross sections(c) and carbon fiber reinforced polymer(CFRP) composite thin-walled tube and Al foam-filled CFRP thin-walled tube(d)
图 2 CFRP复合材料薄壁管应力-应变曲线(a)、压缩后的俯视图和侧视图(b)、x方向应变场(c)和y方向应变场(d)
Figure 2. Stress-strain curve(a), top view and side view after compression(b), strain field in x direction(c) and strain field in y direction(d) of CFRP composite tube
图 3 泡沫铝的应力-应变曲线(a)、压缩后的俯视图和侧视图(b)、x方向应变场(c)和y方向应变场(d)
Figure 3. Stress-strain curve(a), top view and side view after compression(b), strain field in x direction(c) and strain field in y direction(d) of Al foam
图 4 泡沫铝填充CFRP复合材料薄壁管的应力-应变曲线(a)、压缩后的俯视图和侧视图(b)、x方向应变场(c)和y方向应变场(d)
Figure 4. Stress-strain curve(a), top view and side view after compression(b), strain field in x direction(c) and strain field in y direction(d) of Al foam-filled CFRP composite thin-walled tube
图 5 不同环境温度下CFRP复合材料薄壁管(a)、泡沫铝(b)和泡沫铝填充CFRP薄壁管(c)的应力-应变曲线
Figure 5. Stress-strain curves of CFRP thin-walled tubes(a), Al foams(b) and Al foam-filled CFRP composite thin-walled tubes(c) at different environment temperatures
图 6 不同环境温度下CFRP复合材料薄壁管和泡沫铝填充CFRP复合材料薄壁管的峰值应力(a)和最大应力降(b)
Figure 6. Peak stress(a) and maximum stress drop(b) of CFRP thin-walled tubes and Al foam-filled CFRP composite thin-walled tubes at different environment temperatures
图 7 不同环境温度下CFRP复合材料薄壁管(a)、泡沫铝(b)和泡沫铝填充CFRP复合材料薄壁管(c)的吸能曲线
Figure 7. Energy absorption curves of CFRP composite thin-walled tubes(a), Al foams(b) and Al foam- filled CFRP composite thin-walled tubes(c) at different environment temperatures
图 8 不同环境温度下泡沫铝填充CFRP复合材料薄壁管中各组分在50%应变下的吸能
Figure 8. Energy absorption at 50% strain of each component of Al foam-filled CFRP composite thin-walled tube at different environment temperatures
图 9 不同环境温度下泡沫铝对CFRP复合材料薄壁管的增强系数
Figure 9. Enhancement coefficients of Al foam to CFRP composite thin-walled tubes at different environment temperatures
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