燃煤电厂玻璃钢板材耐高温力学性能研究
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摘要
为了研究高温对燃煤电厂玻璃钢板材(以下简称:FRP板材)力学性能的影响,以90℃作为高温环境,设置0 d、30 d、60 d、90 d四个测试时间点,对以"缠绕纱/单向布/缠绕纱/单向布/缠绕纱/短切毡/缠绕纱"为基本结构、经缠绕成型制备的铺层厚度为3. 24 mm、6. 48 mm、9. 72 mm的FRP板材高温老化后的力学性能进行研究。结果表明:随着FRP板材厚度的增加,单向布含量增加,轴向弯曲和轴向拉伸强度均呈上升的趋势;压缩强度的变化趋势和树脂含量的变化趋势一致,表明树脂含量对材料的压缩强度起主要作用;高温老化对FRP板材的弯曲、拉伸、压缩强度均有一定的影响,其中,弯曲强度受高温老化的影响最小,压缩强度受高温老化的影响最为明显,三种试样在90℃老化90 d后,弯曲强度保留率均在85%以上,压缩强度保留率在70%左右; SEM测试表明,高温老化后试样出现明显的纤维拔出,表明纤维/树脂基体界面遭到破坏。最后,建议燃煤电厂FRP板材在制作过程中,重点控制树脂含量。
In this paper,the mechanical properties off FRP plate after high temperature aging in coal fired power plant were investigated. Three kinds of FRP plates with the layer thickness of3. 24 mm、6. 48 mm、9. 72 mm were manufactured by filament winding technique. The aging temperature was set as 90 ℃ and the aging time was set as 0 d、30 d、60 d、90 d.The results show that thecontent of UF increases with the thickness increases,and the axial direction flexural strength and tensile strength exhibitan up trend. Simultaneously,the trend of change of compress strength is consistent with that of resin content,which indicates that resin content has great effect in the compress property. In addition,the flexural strength,tensile strength and compress strength ofcomposites respectively show different degrees of decline after high temperature aging. And the compress strength exhibits the most obvious degradation. After hightemperature aging,the retention rate of flexural strength is above 85 % and that of compress strength is around 70 %. It can be observed from SEM test thatfiber pulls out after aging and the interfacial deboning develops between fiber and matrix. It is suggested that resin content should be controlled well in the manufacturing process of FRP plate.
In this paper,the mechanical properties off FRP plate after high temperature aging in coal fired power plant were investigated. Three kinds of FRP plates with the layer thickness of3. 24 mm、6. 48 mm、9. 72 mm were manufactured by filament winding technique. The aging temperature was set as 90 ℃ and the aging time was set as 0 d、30 d、60 d、90 d.The results show that thecontent of UF increases with the thickness increases,and the axial direction flexural strength and tensile strength exhibitan up trend. Simultaneously,the trend of change of compress strength is consistent with that of resin content,which indicates that resin content has great effect in the compress property. In addition,the flexural strength,tensile strength and compress strength ofcomposites respectively show different degrees of decline after high temperature aging. And the compress strength exhibits the most obvious degradation. After hightemperature aging,the retention rate of flexural strength is above 85 % and that of compress strength is around 70 %. It can be observed from SEM test thatfiber pulls out after aging and the interfacial deboning develops between fiber and matrix. It is suggested that resin content should be controlled well in the manufacturing process of FRP plate.
引文
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[2]蔡建.玻璃钢成型技术[J].工程塑料应用,2003,31(2):66-70.
[3]倪礼忠,周权.高性能树脂基复合材料[M].上海:华东理工大学出版社,2010.
[4]杨小兵,田树桐.玻璃钢在燃煤电厂湿烟囱中的应用研究[J].玻璃钢/复合材料,2011,217(2):39-42.
[5]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.纤维增强塑料弯曲性能试验方法:GB/T 1449—2005[S].北京:中国标准出版社,2005:3-6.
[6]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.纤维增强塑料拉伸性能试验方法:GB/T 1447—2005[S].北京:中国标准出版社,2005:3-9.
[7]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.纤维增强塑料压缩性能试验方法:GB/T 1448—2005[S].北京:中国标准出版社,2005:3-6.
[8]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.玻璃纤维增强塑料树脂含量试验方法:GB/T 2577—2005[S].北京:中国标准出版社,2005:3-5.
[9]中华人民共和国建设部.建筑结构可靠度设计统一标准:GB 50068—2001[S].北京:中国建筑工业出版社,2001:13-14.
[10]陈雨波,朱伯龙.中国土木建筑百科辞典:建筑结构[M].北京:中国建筑工业出版社,1999.
[11] HAQUE M H,UPADHYAYA P,ROY S,et al. The changes in flexural properties and microstructures of carbon fiber bismaleimide composite after exposure to a high temperature[J]. Composite Structures,2014,108(1):57-64.
[12] TANDON G P,RAGLAND W R. Influence of laminate lay-up on oxidation and damage growth:isothermal aging[J].Composites Part A Applied Science&Manufacturing,2011,42(9):1127-1137.
[13] COLIN X,MARAIS C,VERDU J. Kinetic modelling and simulation of gravimetric curves:application to the oxidation of bismaleimide and epoxy resins[J]. Polymer Degradation&Stability,2002,78(3):545-553.
[14] COLIN X,MARAIS C,VERDU J. Kinetic modelling of the stabilizing effect of carbon fibers on thermal ageing of thermoset matrix composites[J]. Composites Science&Technology,2005,65(1):117-127.
[15] AKATAS L,ALTAN M C,OZCELIK O. Thermo-oxidative degradation of graphite/epoxy composite laminates:modeling and long-term predictions[J]. Express Polymer Letters,2009,3(12):797-803.
[16] OLIVIER L,BAUDET C,BERTHEAU D,et al. Development of experimental,theoretical and numerical tools for studying thermo-oxidation of CFRP composites[J]. Composites Part A Applied Science&Manufacturing,2009,40(8):1008-1016.
[17]万怡灶,王玉林,周福刚,等.碳纤维表面处理对C/PLA复合材料界面粘结强度的影响(Ⅱ)[J].材料工程,2000(7):17-19.