摘要
为确定新研制的酚醛/玻纤复合材料的抗拉强度是否满足设计及使用要求,研究了酚醛/玻纤复合材料在-55℃、20℃干态/湿态、71℃干态/湿态和93℃干态/湿态的经向拉伸性能,讨论了不同温度以及湿态处理对酚醛/玻纤复合材料拉伸强度的影响规律,利用扫描电子显微镜(SEM)考察了试件断口的显微结构和断裂形态.研究结果表明:随着温度的升高,酚醛/玻纤层合板的抗拉强度总体呈现下降的趋势.干态条件下,20℃状态的抗拉强度比-55℃状态下的降低了129.9MPa,即降低了24.26%;71℃状态下的抗拉强度比20℃状态下降低了50MPa,即降低了12.33%;93℃状态下的抗拉强度比71℃状态下降低了62MPa,即降低了20.33%.湿态条件下,71℃状态下的抗拉强度比20℃状态下降低了72.3MPa,即降低了29.19%;93℃状态下的抗拉强度比71℃状态下降低了72MPa,即降低了26.57%.在同一温度下,湿态状态下试样的抗拉强度比干态状态下的明显降低.20℃状态下,湿态比干态降低了69.67MPa,即降低了17.18%;71℃状态下,湿态比干态降低了117.7MPa,即降低了33.11%;93℃状态下,湿态比干态降低了111.6MPa,即降低了39.41%.
In order to find whether the tensile strength of the new phenolic/glass fiber composite meets the requirement ,the tensile properties of phenolic/glass fiber composite at 55 ℃ ,20 ℃（wet/dry） and 93℃ （wet/dry ） have been studied .The effects of different temperature and wet-treatment on tensile properties have been discussed .Microstructures and fracture morphology were studied by means of SEM .The results show ：The tensile properties of phenolic/glass fiber composite are generally decreased with the rising of temperature .In dry condition ,the tensile strength at 20 ℃ decreases 129 .9 M Pa compared with that at -55 ℃ ,which is reduced by 24 .26% .The tensile strength at 71 ℃decreases 50MPa compared with that at 20 ℃ ,which is reduced by 12 .33% .The tensile strength at 93 ℃ decreases 62 MPa compared with that at 71 ℃ ,which is reduced by 20 .33% .In wet condition ,the tensile strength at 71 ℃ reduces 72 .3 MPa compared with that at 20 ℃ ,that is ,it reduces 29 .19% .The tensile strength at 93 ℃ reduces 72 MPa compared with that at 71 ℃ ,that is ,it reduces 26 .57% .In the same temperature ,the tensile strength in wet condition decreases clearly than it in dry condition .In 20 ℃ ,the tensile strength at wet condition reduces 69 .67 MPa compared with that at dry condition ,which is reduced by 17 .18% .In 71 ℃ ,the tensile strength at wet condition reduces 117 .7 MPa compared with that at dry condition ,which is reduced by 33 .11% .In 93 ℃ ,the tensile strength at wet condition reduces 111 .6 M Pa compared with that at dry condition ,w hich is reduced by 39 .41% .
出处
《西安工业大学学报》
CAS
2014年第4期325-330,共6页
Journal of Xi’an Technological University
关键词
玻璃纤维
酚醛树脂
复合材料
抗拉强度
湿态处理
glass fiber
phenolic resin
composite material
tensile strength
wet treatment
