Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (2): 400-409.doi: 10.13229/j.cnki.jdxbgxb.20220337

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Three⁃point bending fatigue properties of carbon fiber composite laminates

Liang XU1(),Jing-hou XIAO1,Wan-wan SONG2,Song ZHOU1()   

  1. 1.School of Mechatronics Engineering，Shenyang Aerospace University，Shenyang 110136，China
    2.Factory 53，Shenyang Aircraft Corporation，Shenyang 110034，China
  • Received:2022-06-20 Online:2024-02-01 Published:2024-03-29
  • Contact: Song ZHOU E-mail:sysyxu@163.com;zhousong23@163.com

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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

CLC Number: 

  • TB332

Table 1

Three laminate sizes"

试样长/mm宽/mm厚/mm
2 mm厚度8412.52.0
2.4 mm厚度8412.52.4
7 mm厚度27015.07.0

Fig.1

Schematic diagram of static three-point bending test"

Fig.2

Schematic diagram of three-point bending fatigue test"

Fig.3

Static bending test process curve"

Fig.4

Static bending test results"

Table 2

Mean fatigue life of specimens with different thicknesses"

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
0.596% UTS10 6460.0665% UTS17 5170.0694% UTS27 834
92% UTS14 17963% UTS12 74988% UTS34 242
90% UTS146 04260% UTS201 90182% UTS143 660
0.698% UTS20330.168% UTS18060.198% UTS8942
96% UTS30 45565% UTS14 77094% UTS37 931
94% UTS240 38660% UTS32 31990% UTS69 078

Fig.5

Bending fatigue test results"

Fig.6

Fatigue S-N curve"

Fig.7

Destruction morphology of laminate surface"

Fig.8

Morphology analysis of side deflection failure of laminates"

Fig.9

SEM observation of laminate fatigue failure"

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