Damage tolerance assessment of the interface strength gradation in thermoplastic composites
Damage tolerance assessment of the interface strength gradation in thermoplastic composites
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DOI：
10.1016/j.compositesb.2017.01.014
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发表时间：
2017-03
影响因子：
13.1
通讯作者：
L. Sorrentino;F. Sarasini;J. Tirillò;F. Touchard;L. Chocinski-Arnault;D. Mellier;P. Russo
中科院分区：
文献类型：
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作者：
L. Sorrentino;F. Sarasini;J. Tirillò;F. Touchard;L. Chocinski-Arnault;D. Mellier;P. Russo
采用基于层间界面强度分级的热塑性复合材料杂化方法(IGIS设计)，通过适当地交替增容和非增容聚合物薄膜来制备聚丙烯/玻璃纤维复合材料。采用顺丁烯二酸丁二醇酯(MAR)改性聚丙烯来改善基体/纤维界面强度。弯曲和低速冲击性能测试表明，偶联剂的使用通过增强基体/纤维界面改善了复合材料的准静态弯曲性能，但显著降低了层合板的低速冲击性能。使用IGIS设计，通过层压厚度对界面强度进行分级，使复合材料的制造具有弯曲性能和抗冲击性能的良好组合，并被证明在更好地保持纤维完整性方面是有效的。利用微电子计算机断层扫描和声发射分析对冲击后的损伤进行了评估，分析了基质杂化对冲击抗力的改善作用，并通过声发射分析确定了冲击能量吸收的机理。指出了基质杂交序列在层合板整体力学性能中的作用，以及IGIS设计在层合板整体力学性能中的有效作用。
The newly developed hybridization approach for thermoplastic composites, based on the gradation of the interlaminar interface strength (IGIS design), was used to prepare polypropylene/glass fibre composites by properly alternating layers of reinforcing fabric with compatibilized and not compatibilized polymeric films. Maleated polypropylene was used to improve the matrix/fibre interface strength. The flexural and low-velocity impact characterizations showed that the use of the coupling agent improved the quasi-static flexural properties through the strengthening of the matrix/fibre interface, but considerably lowered the low velocity impact resistance of the laminate. The use of the IGIS design, which grades the interface strength through the laminate thickness, enabled the fabrication of composites with a favourable combination of flexural properties and impact resistance and proved to be effective in better preserving the integrity of the fibres. The damage after impact has been assessed by means of micro-computed tomography, which elucidated the improving effect of the matrix hybridization on the impact resistance, and acoustic emission analysis, which allowed the identification of the mechanisms responsible for impact energy absorption. The role played by the matrix hybridization sequence was pointed out along with the effective role of IGIS design in the overall mechanical performance of laminates.