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| 热循环对碳纤维/双马来酰亚胺复合材料的影响 |
| Aging effects of carbon fiber/bismaleimide composite subjected to thermal cycling |
| Received:August 26, 2017 Revised:October 23, 2017 |
| DOI：10.7520/1001-4888-17-175 |
| 中文关键词: 热循环 碳纤维/双马来酰亚胺复合材料 微裂纹 层间剪切强度 三点弯曲 |
| 英文关键词:thermal cycling carbon fiber/bismaleimide composite micro-cracks interlaminar shear strength three point bend |
| 基金项目:陕西省自然科学基础研究基金(2017JM5018)；国家自然科学基金(51305351)；高等教育博士点基金 (20136102120031) |
| Author Name | Affiliation | | YANG Bai-feng* | School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China | | YUE Zhu-feng | School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China | | GENG Xiao-liang | School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China | | WANG Pei-yan | School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China |
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| 中文摘要: |
| 碳纤维/双马来酰亚胺复合材料比强度和比模量高，热稳定性良好，因此在航空航天飞行器中广泛应用。在低地球轨道空间，卫星和航天飞机穿梭于地球阴影内外，会受到外界温度的周期性影响。本文研究了高温环境(200℃)中和受到热循环老化(-120℃~200℃)的复合材料力学性能和微观形貌的变化。经过热循环处理之后，试样层间剪切强度降低；通过将横截面和侧面打磨抛光并使用扫描电镜进行观测，在横截面和侧面上均发现了细观微裂纹。大部分微裂纹萌生于基体及界面上，界面脱粘和碎屑明显可见，基体与界面处产生微裂纹是层间剪切强度下降的主要原因。因此，在复合材料的应用中应该关注热循环诱发微裂纹的现象。 |
| 英文摘要: |
| Carbon fiber/bismaleimide composite has high specific strength, specific modulus and excellent thermal stability, thus is being widely used in aerospace and aeronautic vehicles. In low earth orbit space, satellite and space shuttle shuttle in and out of the earth's shadow and are periodically subjected to external temperature influence. In this paper, mechanical properties and micro-morphology variation of composite in high temperature environment (200℃) and subjected to thermal cycle degradation (-120℃~200℃) are studied. The interlaminar shear strength decreases after thermal cycle treatment. By using scanning electron microscopy, micro-cracks are found on both cross-section and side after grinding and polishing treatment. Most of micro-cracks occur on matrix and interface, and the interfacial debonding and debris are obviously visible. Micro-cracks produced on matrix and interface are the main reason for the decrease of interlaminar shear strength. Therefore, in the application of composite materials, attention should be paid to the phenomenon of micro-crack induced by thermal cycle. |
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