碳纤维复合材料层合板三点弯曲疲劳性能

doi:10.13229/j.cnki.jdxbgxb.20220337

摘要/Abstract

摘要：

对3种不同厚度的T700碳纤维复合材料多向层合板在2种应力比及3种应力等级下进行三点弯曲试验，对其三点弯曲静态与疲劳性能进行分析。采用不同方式对破坏后形貌进行观察。结果显示：材料厚度的增加使试样弯曲强度与模量增加，复合材料多向层合板的三点弯曲疲劳寿命与材料厚度成正比关系，与试验应力比、应力等级成反比关系。试样最终的疲劳破坏程度与疲劳寿命有关，疲劳循环数越多，层合板在横向和纵向的破坏越剧烈。同时，试样厚度越大，分层现象越明显，同时存在纤维拔出现象。

关键词: 复合材料, 三点弯曲, 弯曲疲劳, 破坏形貌, 疲劳性能

Abstract:

In this paper， three-point bending tests of T700 carbon fiber composite multi-directional laminates with different thicknesses are carried out under two stress ratios and three stress levels， and the static and fatigue properties of three-point bending are analyzed. The morphology after damage was observed in different ways. The results show that the increase of material thickness increases the flexural strength and modulus of the specimen， and the three-point bending fatigue life of composite multi-directional laminates is proportional to the material thickness， and inversely proportional to the test stress ratio and stress level. The final fatigue failure degree of the sample is related to the fatigue life， the higher the number of fatigue cycles， the more severe the damage in the transverse and longitudinal directions of the plywood. At the same time， the greater the thickness of the sample， the more obvious the delamination phenomenon， and the phenomenon of fiber pull out.

Key words: composite material, three point bending, bending fatigue, destroy the shape, fatigue performance

中图分类号:

TB332

许良,肖景厚,宋万万,周松. 碳纤维复合材料层合板三点弯曲疲劳性能[J]. 吉林大学学报(工学版), 2024, 54(2): 400-409.

Liang XU,Jing-hou XIAO,Wan-wan SONG,Song ZHOU. Three⁃point bending fatigue properties of carbon fiber composite laminates[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(2): 400-409.

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试样	长/mm	宽/mm	厚/mm
2 mm厚度	84	12.5	2.0
2.4 mm厚度	84	12.5	2.4
7 mm厚度	270	15.0	7.0

2 mm厚度试样			2 mm加厚试样			7 mm试样
应力比	应力等级	平均寿命	应力比	应力等级	平均寿命	应力比	应力等级	平均寿命
0.5	96% UTS	10 646	0.06	65% UTS	17 517	0.06	94% UTS	27 834
	92% UTS	14 179		63% UTS	12 749		88% UTS	34 242
	90% UTS	146 042		60% UTS	201 901		82% UTS	143 660
0.6	98% UTS	2033	0.1	68% UTS	1806	0.1	98% UTS	8942
	96% UTS	30 455		65% UTS	14 770		94% UTS	37 931
	94% UTS	240 386		60% UTS	32 319		90% UTS	69 078