玄武岩织物增强树脂基复合材料层板力学性能研究
发布时间：2018-10-14 08:12
【摘要】：高新技术纤维日渐成为纺织工业发展的生力军及复合材料增强材料的优先选择。玄武岩纤维作为一种材料来源非常丰富的新型高性能无机纤维,因其抗拉强度和拉伸模量大、耐热性好、抗震性强、耐腐蚀性优良等性能非常适用于军工、建筑、汽车等领域复合材料制品的制备。传统复合材料层板结构使用过程中容易发生分层损伤降低了材料的层间力学性能,本文针对这一缺陷,利用缝合层间连接技术和RTM成型工艺,制备了缝合针距为3mm,缝合行距分别为3mm、5mm和7mm的玄武岩纤维织物增强树脂基复合材料层板。通过与纤维体积含量及厚度相同的的未缝合玄武岩纤维织物增强复合材料层板的对比,研究了不同缝合工艺参数对复合材料层板面内和层间力学性能的影响。弯曲性能测试表明:(1)针距一定,两种缝合方向弯曲强度最大时的缝合行距都为5mm,对应缝合密度为6.67针/cm_2,两种缝合方向弯曲模量最大时的缝合行距为都7mm,对应缝合密度为4.76针/cm_2;(3)纵向缝合复合材料层板的弯曲极限载荷低于相同密度横向缝合的弯曲极限载荷,但是纵向缝合在材料达到破坏载荷后的后续承载能力明显优于横向缝合;(4)较小的缝合行距和较大的缝合密度对复合材料层板的弯曲性能有利。拉伸性能测试表明:(1)3mm行距横向缝合复合材料层板的弯曲模量略高于未缝合层板,其它行距横向缝合材料的弯曲强度和模量都比未缝合层板低;(2)缝合降低了复合材料层板的拉伸性能。利用ABAQUS有限元软件进行拉伸破坏的简化模拟结果与实际大致相符。压缩性能测试表明:(1)相较于未缝合复合材料层板,3mm、5mm行距横向缝合提高了层板的强度和模量,7mm行距横向缝合降低了层板的强度和模量;(2)较小的横向缝合密度对复合材料层板的压缩性能有利。Ⅱ型层间断裂韧性研究表明缝合复合材料层板的层间断裂韧性随着缝合密度的增大而增大,缝合能够阻滞裂纹扩展,提高材料抵抗分层的能力。
[Abstract]:High-tech fiber is becoming the priority of textile industry and composite material. As a new type of high performance inorganic fiber with abundant material sources, basalt fiber is very suitable for military industry and building because of its high tensile strength and tensile modulus, good heat resistance, strong seismic resistance, excellent corrosion resistance, etc. Preparation of composite materials in automobile and other fields. Traditional composite laminates are prone to delamination damage, which reduces the interlaminar mechanical properties. In this paper, suture interlaminar bonding technology and RTM molding technology are used to solve this problem. The basalt fiber fabric reinforced resin matrix composite laminates with stitch spacing of 3 mm, suture distance of 3 mm and line spacing of 5 mm and 7mm were prepared. By comparing the unstitched basalt fabric reinforced composite laminates with the same volume content and thickness of fibers, the effects of different stitching process parameters on the in-plane and interlaminar mechanical properties of composites were studied. The bending performance tests show that: (1) the needle spacing is constant, When the flexural strength of two suture directions is maximum, the suture spacing is 5 mm, the suture interval is both 7 mm when the suture density is 6.67 pin / cm_2, and the suture density is 4.76 pin / cm_2; (3) longitudinal suture composite material. The bending limit load of laminates is lower than that of transverse stitching of the same density. However, the subsequent loading capacity of longitudinal suture is significantly better than that of transverse suture after the material reaches the failure load. (4) smaller stitch spacing and larger suture density are beneficial to the bending performance of composite laminates. The tensile properties test showed that: (1) the flexural modulus of 3mm sutured laminates was slightly higher than that of unstitched laminates. The flexural strength and modulus of other transverse suture materials are lower than that of unstitched laminates. (2) stitching reduces the tensile properties of composite laminates. The simplified simulation results of tensile failure by using ABAQUS finite element software are in good agreement with the actual situation. The results of compression test show that: (1) compared with unstitched composite laminates, transverse suture with 3mm or 5mm spacing increases the strength and modulus of the laminates, while the transverse suture with 7mm spacing decreases the strength and modulus of the laminates, and (2) the transverse suture density increases the strength and modulus of the laminates with small transverse suture density. The study of mode 鈪，
本文编号：2269847
[Abstract]:High-tech fiber is becoming the priority of textile industry and composite material. As a new type of high performance inorganic fiber with abundant material sources, basalt fiber is very suitable for military industry and building because of its high tensile strength and tensile modulus, good heat resistance, strong seismic resistance, excellent corrosion resistance, etc. Preparation of composite materials in automobile and other fields. Traditional composite laminates are prone to delamination damage, which reduces the interlaminar mechanical properties. In this paper, suture interlaminar bonding technology and RTM molding technology are used to solve this problem. The basalt fiber fabric reinforced resin matrix composite laminates with stitch spacing of 3 mm, suture distance of 3 mm and line spacing of 5 mm and 7mm were prepared. By comparing the unstitched basalt fabric reinforced composite laminates with the same volume content and thickness of fibers, the effects of different stitching process parameters on the in-plane and interlaminar mechanical properties of composites were studied. The bending performance tests show that: (1) the needle spacing is constant, When the flexural strength of two suture directions is maximum, the suture spacing is 5 mm, the suture interval is both 7 mm when the suture density is 6.67 pin / cm_2, and the suture density is 4.76 pin / cm_2; (3) longitudinal suture composite material. The bending limit load of laminates is lower than that of transverse stitching of the same density. However, the subsequent loading capacity of longitudinal suture is significantly better than that of transverse suture after the material reaches the failure load. (4) smaller stitch spacing and larger suture density are beneficial to the bending performance of composite laminates. The tensile properties test showed that: (1) the flexural modulus of 3mm sutured laminates was slightly higher than that of unstitched laminates. The flexural strength and modulus of other transverse suture materials are lower than that of unstitched laminates. (2) stitching reduces the tensile properties of composite laminates. The simplified simulation results of tensile failure by using ABAQUS finite element software are in good agreement with the actual situation. The results of compression test show that: (1) compared with unstitched composite laminates, transverse suture with 3mm or 5mm spacing increases the strength and modulus of the laminates, while the transverse suture with 7mm spacing decreases the strength and modulus of the laminates, and (2) the transverse suture density increases the strength and modulus of the laminates with small transverse suture density. The study of mode 鈪，
本文编号：2269847
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