Performance and residual strength of metal-faced composite corrugated sandwich structure under multiple impacts
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摘要: 金属面复合材料波纹夹层结构结合了金属耐冲击和复合材料高比强度/比刚度的优点，是一种优异的新型结构形式，在服役过程中夹层结构会遭受多次冲击工况，而其多次冲击损伤模式及损伤后剩余强度规律目前尚未明确。为此通过多次冲击试验和CT无损扫描分析方法，对其在低速冲击动力学响应、内部失效模式、载荷-位移特性以及能量吸收特征进行了深入研究，并在此基础上，通过对冲击后的试件开展平面压缩试验，对多次冲击后的剩余压缩强度及失效模式进行了分析。结果表明：首次冲击造成了大部分的伤害，随着冲击次数的提高将导致夹层结构的吸能性降低，抗冲击性下降。多次冲击中，夹层结构的损伤模式以芯材的基体开裂、分层和纤维断裂为主，大能量的多次冲击总是造成更大的损伤。此外，随着冲击次数的增多，损伤累积接近饱和，剩余压缩强度趋近阈值。Abstract: The metallic-faced composite corrugated sandwich structure, which combines the impact resistance of metals with the high specific strength and stiffness of composites, represents an exemplary form of innovative construction. During its service life, the sandwich structure is subjected to multiple impact conditions, yet the patterns of damage from repeated impacts and the post-damage residual strength are not yet clearly understood. To address this, a comprehensive study was conducted through a series of impact tests and CT non-destructive scanning analyses, delving into the dynamic response to low-velocity impacts, internal failure modes, load-displacement characteristics, and energy absorption features. Furthermore, based on these findings, plane compression tests were carried out on impacted specimens to analyze the residual compressive strength and failure modes after multiple impacts. The findings indicate that the initial impact inflicts the most damage, and with increasing impact frequency, the energy-absorbing capacity and impact resistance of the sandwich structure diminish. In multiple impacts, the predominant damage modes in the sandwich structure include matrix cracking, delamination, and fiber breakage in the core material, with higher energy impacts invariably causing more extensive damage. Moreover, as the number of impacts increases, the accumulation of damage approaches saturation, and the residual compressive strength trends towards a threshold value.
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Key words:
- metal-faced /
- composite materials /
- sandwich structure /
- multiple impacts /
- impact damage /
- residual strength
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图 1 复合材料波纹夹层结构示意图
Figure 1. Diagram of the Composite Material Corrugated Sandwich Structure
图 4 波纹夹层板安装布置图
Figure 4. Layout diagram for installation of the corrugated sandwich panel
图 7 金属面复合材料波纹夹层结构不同冲击能量下:(a)冲击力-时间曲线 (b)冲击力-位移曲线
Figure 7. Metal-faced composite corrugated sandwich structures under different impact energies: (a) Impact force-time curve (b) Impact force-displacement curve
图 8 金属面复合材料波纹夹层结构不同冲击能量下：(a)最大冲击力 (b)最大冲击位移
Figure 8. Metal-faced composite corrugated sandwich structures under different impact energies: (a) Maximum impact force (b) Maximum impact displacement
图 9 金属面复合材料波纹夹层结构不同冲击能量下：(a)能量-时间曲线 (b)能量吸收比例
Figure 9. Metal-faced composite corrugated sandwich structures under different impact energies: (a) Energy-time curve (b) Energy absorption ratio
图 10 金属面复合材料波纹夹层结构10 J不同冲击次数下:
(a) 1-5次冲击力-时间曲线 (b) 1-5次冲击力-位移曲线(c) 6-10次冲击力-时间曲线 (d) 6-10次冲击力-位移曲线
Figure 10. Fig. Metal surface composite corrugated sandwich structure under different impact times of 10 J:
(a) Force-time curves for 1 st to 5 th impacts (b) Force-displacement curves for 1 st to 5 th impacts (c) Force-time curves for 6 th to 10 th impacts (d) Force-displacement curves for 6 th to 10 th impacts
图 11 金属面复合材料波纹夹层结构10 J不同冲击次数下：(a)最大冲击力 (b)最大冲击位移
Figure 11. Metal surface composite corrugated sandwich structure under different impact times of 10 J: (a) Maximum impact forces (b) Maximum impact displacements
图 12 金属面复合材料波纹夹层结构10 J不同次数下：(a) 1-5次能量-时间曲线 (b) 6-10次能量-时间曲线 (c) 能量吸收比例
Figure 12. Metal surface composite corrugated sandwich structure under different impact times of 10 J: (a) Energy-time curves for 1 st to 5 th impacts(b) Energy-time curves for 6 th to 10 th impacts (c) Energy absorption ratios
图 13 金属面复合材料波纹夹层结构20 J不同冲击次数下：(a)冲击力-时间曲线 (b)冲击力-位移曲线
Figure 13. Metal surface composite corrugated sandwich structure under different impact times of 20 J: (a) Force-time curves (b) Force-displacement curves
图 14 金属面复合材料波纹夹层结构20 J不同冲击次数下：(a)最大冲击力 (b)最大冲击位移
Figure 14. Metal surface composite corrugated sandwich structure under different impact times of 20 J: (a) Maximum impact forces (b) Maximum impact displacements
图 15 金属面复合材料波纹夹层结构20 J不同冲击次数下：(a)能量-时间曲线 (b)能量吸收比例
Figure 15. Metal surface composite corrugated sandwich structure under different impact times of 20 J: (a) Energy-time curves (b) Energy absorption ratios
图 16 金属面复合材料波纹夹层结构不同能级单次冲击CT损伤图
Figure 16. CT images of damage in the Metal surface composite corrugated sandwich structure under different single impact energy levels
图 17 金属面复合材料波纹夹层结构10 J多次冲击损伤图
Figure 17. Damage images in the Metal surface composite corrugated sandwich structure after multiple impacts at an energy level of 10 J
图 18 金属面复合材料波纹夹层结构20 J多次冲击损伤图
Figure 18. Damage images in the Metal surface composite corrugated sandwich structure after multiple impacts at an energy level of 20 J
图 19 金属面复合材料波纹夹层结构平面压缩下失效模式
Figure 19. Failure modes of the Metal surface composite corrugated sandwich structure under planar compression
图 20 金属面复合材料波纹夹层结构不同能级单次冲击后压缩力-位移曲线
Figure 20. Compression force-displacement curves of metal surface composite corrugated sandwich structures after single impact at different energy levels
图 21 金属面复合材料波纹夹层结构不同冲击能量下剩余压缩强度系数
Figure 21. Residual compressive strength coefficient of metal surface composite corrugated sandwich structure under different impact energies
图 22 金属面复合材料波纹夹层结构10 J多次冲击后压缩力-位移曲线
Figure 22. Compression force-displacement curve of metal surface composite corrugated sandwich structure after 10 J multiple impacts
图 23 金属面复合材料波纹夹层结构10 J不同冲击次数下剩余压缩强度系数
Figure 23. Residual compressive strength coefficient of metal surface composite corrugated sandwich structure under different impact times of 10 J
图 24 金属面复合材料波纹夹层结构20 J多次冲击后压缩力-位移曲线
Figure 24. Compression force-displacement curve of metal surface composite corrugated sandwich structure after 20 J multiple impacts
图 25 金属面复合材料波纹夹层结构20 J不同冲击次数下剩余压缩强度系数
Figure 25. Residual compressive strength coefficient of metal surface composite corrugated sandwich structure under different impact times of 20 J
表 1 金属面复合材料波纹夹层结构不同能量级别冲击后剩余压缩强度系数
Table 1. Residual compressive strength coefficient of metal surface composite corrugated sandwich structure after impact at different energy levels
Specimen ID E/J Fmax/kN σd/MPa θ F-C0 N0 0 80.81 5.387 1 F-C10 N1 10 70.14 4.676 0.868 F-C20 N1 20 56.13 3.742 0.695 F-C40 N1 40 48.52 3.235 0.601 F-C60 N1 60 45.42 3.028 0.562 Notes：E are the Impact Energy; Fmax are the Maximum Load Force; σd are the Residual Compressive Strength; θ are the Residual Compressive Strength Coefficient. 
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表 2 金属面复合材料波纹夹层结构10 J多次冲击后剩余压缩强度系数
Table 2. Residual compressive strength coefficient of metal surface composite corrugated sandwich structure after 10 J multiple impacts
Specimen ID E/J Fmax/kN σd/MPa θ F-C0 N0 0 80.81 5.387 1 F-C10 N1 10 70.14 4.676 0.868 F-C10 N2 10 63.86 4.257 0.791 F-C10 N4 10 53.74 3.583 0.665 F-C10 N6 10 49.99 3.333 0.619 F-C10 N8 10 46.66 3.111 0.578 F-C10 N10 10 46.79 3.119 0.579
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表 3 金属面复合材料波纹夹层结构20 J多次冲击后剩余压缩强度系数
Table 3. Residual compressive strength coefficient of metal surface composite corrugated sandwich structure after 20 J multiple impacts
Specimen ID E/J Fmax/kN σd/MPa θ F-C0 N0 0 80.81 5.387 1 F-C20 N1 20 56.13 3.742 0.695 F-C20 N2 20 50.35 3.357 0.623 F-C20 N3 20 49.56 3.304 0.613 F-C20 N4 20 48.22 3.215 0.597 F-C20 N5 20 44.57 2.971 0.552
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