【摘要】：高新技術(shù)纖維日漸成為紡織工業(yè)發(fā)展的生力軍及復合材料增強材料的優(yōu)先選擇。玄武巖纖維作為一種材料來源非常豐富的新型高性能無機纖維,因其抗拉強度和拉伸模量大、耐熱性好、抗震性強、耐腐蝕性優(yōu)良等性能非常適用于軍工、建筑、汽車等領域復合材料制品的制備。傳統(tǒng)復合材料層板結(jié)構(gòu)使用過程中容易發(fā)生分層損傷降低了材料的層間力學性能,本文針對這一缺陷,利用縫合層間連接技術(shù)和RTM成型工藝,制備了縫合針距為3mm,縫合行距分別為3mm、5mm和7mm的玄武巖纖維織物增強樹脂基復合材料層板。通過與纖維體積含量及厚度相同的的未縫合玄武巖纖維織物增強復合材料層板的對比,研究了不同縫合工藝參數(shù)對復合材料層板面內(nèi)和層間力學性能的影響。彎曲性能測試表明:(1)針距一定,兩種縫合方向彎曲強度最大時的縫合行距都為5mm,對應縫合密度為6.67針/cm_2,兩種縫合方向彎曲模量最大時的縫合行距為都7mm,對應縫合密度為4.76針/cm_2;(3)縱向縫合復合材料層板的彎曲極限載荷低于相同密度橫向縫合的彎曲極限載荷,但是縱向縫合在材料達到破壞載荷后的后續(xù)承載能力明顯優(yōu)于橫向縫合;(4)較小的縫合行距和較大的縫合密度對復合材料層板的彎曲性能有利。拉伸性能測試表明:(1)3mm行距橫向縫合復合材料層板的彎曲模量略高于未縫合層板,其它行距橫向縫合材料的彎曲強度和模量都比未縫合層板低;(2)縫合降低了復合材料層板的拉伸性能。利用ABAQUS有限元軟件進行拉伸破壞的簡化模擬結(jié)果與實際大致相符。壓縮性能測試表明:(1)相較于未縫合復合材料層板,3mm、5mm行距橫向縫合提高了層板的強度和模量,7mm行距橫向縫合降低了層板的強度和模量;(2)較小的橫向縫合密度對復合材料層板的壓縮性能有利。Ⅱ型層間斷裂韌性研究表明縫合復合材料層板的層間斷裂韌性隨著縫合密度的增大而增大,縫合能夠阻滯裂紋擴展,提高材料抵抗分層的能力。
[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，

本文編號：2269847