新型钛合金网/碳纤维混杂复合板:制备与表征

New type of titanium alloy grid/carbon fiber hybrid composite laminate: fabrication and characterization

  • 摘要: 利用钛合金编织网替代传统钛合金薄板,制备了一种新型钛合金网/碳纤维混杂复合板(TGCF)。通过热压成型工艺制备了不同固化压力下的TGCF,定量分析了其微观结构特征并揭示了其界面结合机制。开展了室温短梁剪切试验,并研究了其损伤演化行为和断裂机制。此外,开展了TGCF与钛合金板/碳纤维混杂复合板(HTCLs)的对比实验。结果表明,固化过程中树脂渗入钛合金网格可有效形成多界面机械互锁,通过提高固化压力可有效促进其流动行为,从而改善界面结合能力。当固化压力由0 MPa增加到0.6 MPa时,TGCF的孔隙率由(0.89±0.05)%降低为(0.18±0.03)%,层间剪切强度(ILSS)提高23.80%。另外,TGCF的多界面互锁效应可明显抑制材料内部界面滑移行为,提高抗剪能力。相同固化压力下(0.6 MPa),与HTCLs相比,TGCF的ILSS提高了48.90%。

     

    Abstract: A new type of titanium alloy grid/carbon fiber hybrid composite laminates (TGCF) was prepared by replacing traditional titanium alloy sheet with titanium alloy woven grid. TGCF with different curing pressures was prepared using the autoclave process, and its microstructure characteristics were quantitatively analyzed to reveal its interfacial bonding mechanism. Room beam shear tests were conducted and their damage evolution behavior and facture mechanism were researched. In addition, comparative experiments were conducted between TGCF and titanium alloy sheet/carbon fiber hybrid composite laminates (HTCLs). The results indicate that resin infiltration into the titanium alloy grid during the curing process can effectively form a multi interface mechanical interlock, and its flow behavior can be promoted by increasing the curing pressure to improve the interfacial bonding ability. When the curing pressure increases from 0 MPa to 0.6 MPa, the porosity of TGCF decreases from (0.89±0.05)% to (0.18±0.03)%, and the interlaminar shear strength (ILSS) increases by 23.80%. In addition, the multi interface interlocking effect of TGCF can significantly inhibition internal interface slip behavior and improve shear resistance. Under the same curing pressure, TGCF shows a 48.90% increase in ILSS compared to HTCLs.

     

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