切削温度对碳纤维复合材料剪切性能影响研究
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摘要
在碳纤维增强型环氧树脂基复合材料(CFRP)的加工过程中容易产生高切削温度,引起严重的加工损坏,例如加工过程中的分层。为了研究切削温度对CFRP加工后使用性能的影响。根据CFRP加工过程中产生的切削温度,将试样加热到设定的不同温度,保证加热时间相同,再将样品放入空气中进行冷却,安装应变片后进行剪切试验;通过试验得出:切削温度对CFRP的剪切强度有很大影响,随着温度升高,剪切强度降低。特别是当温度接近玻璃化转变温度时,剪切强度最低;在玻璃化温度下,加热温度越高,材料破坏情况越明显。可以得出结论,如果材料温度接近玻璃化转变温度并保持一段时间,则CFRP的剪切性能会严重受损。因此,切削温度应远离加工过程中的玻璃化转变温度。
High cutting temperature is easily generated during machining of carbon fiber reinforced plastics(CFRP), it can induce serious machining damages such as delamination during machining. The purpose of this paper is to study the influence of cutting temperature on the performance of CFRP after machining. According to the cutting temperature generated during machining of CFRP, specimens were heated to given temperatures. Then, these specimens were put in air for cooling as what happened during machining. After this, a shear experiment was carried out to investigate the shear properties of these specimens. The results show that temperature had a great influence on shear stress of the CFRP. With the increasing of temperature, the shear stress decreased. Especially, the stress became the lowest when the temperature was close to the glass-transition temperature. It can be concluded that shear properties of CFRP can be seriously damaged if the material temperature was close to the glass-transition temperature and kept for a period of time. As a result, cutting temperature should be kept away from the glass-transition temperature during machining.
High cutting temperature is easily generated during machining of carbon fiber reinforced plastics(CFRP), it can induce serious machining damages such as delamination during machining. The purpose of this paper is to study the influence of cutting temperature on the performance of CFRP after machining. According to the cutting temperature generated during machining of CFRP, specimens were heated to given temperatures. Then, these specimens were put in air for cooling as what happened during machining. After this, a shear experiment was carried out to investigate the shear properties of these specimens. The results show that temperature had a great influence on shear stress of the CFRP. With the increasing of temperature, the shear stress decreased. Especially, the stress became the lowest when the temperature was close to the glass-transition temperature. It can be concluded that shear properties of CFRP can be seriously damaged if the material temperature was close to the glass-transition temperature and kept for a period of time. As a result, cutting temperature should be kept away from the glass-transition temperature during machining.
引文
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[3] 田鹤.树脂基复合材料固化过程中的温度场及热应力分析[D].广汉:中国民用航空飞行学院,2014.
[4] 吴伟萍.浅议温度环境下树脂基复合材料力学性能及模型研究[J].民营科技,2017(6):42.
[5] 李仲平,卢子兴,冯志海,等.高温炭化处理对三维五向碳/酚醛编织复合材料拉伸性能的影响[J].复合材料学报,2007,24(2):105-112.
[6] 潘利剑,张博明,戴福洪.黏弹阻尼层共固化复合材料不同温度下的阻尼性能[J].复合材料学报,2008,25(1):168-172.
[7] Ramazan K,Yusuf A.Compression after impact behavior of laminated composite plates subjected to low velocity impact in high temperatures [J].Composite Structures,2009,89:77-82.
[8] 蔡晓江.基于复合材料各向异性的切削力热变化规律和表面质量评价试验研究[D].上海:上海交通大学,2014.
[9] 欧阳林辉.温度环境对复合材料力学性能影响研究[D].西安:西北工业大学,2016.
[10] 翁晶萌,温卫东,徐颖,等.含孔复合材料层合板温度环境下的拉伸性能[J].航空动力学报,2015,30(5):1162-1170.
[11] 王立鼎.聚合物微纳米加工技术[M].北京:国防工业出版社,2012.