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Chinese Journal of Materials Research  2015, Vol. 29 Issue (8): 613-621    DOI: 10.11901/1005.3093.2014.613
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Shear Properties of Resin Composites Reinforced with Multilayer-connected Biaxial Weft Knitted Fabric of Carbon Fibers
Xiaoyuan PEI1,2,Bo SHANG1,3,Jialu LI1,**(),Li CHEN1,Gang DING4,5
1. Composites Research Institute of Tianjin Polytechnic University & Tianjin and Education Ministry Key Laboratory of Advanced Textile Composite Materials, Tianjin 300387, China
2. School of Material Science and Engineering, Tianjin Polytechnic University & State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Polytechnic University, Tianjin 300387, China
3. Aerospace Shenzhou Aerial Vehicle Ltd., Tianjin 300160, China
4. College of Textile of Tianjin Polytechnic University, Tianjin 300387, China
5. Department of the Management and Construction of Teaching Resources, Tianjin Radio & TV University,Tianjin 300191, China
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Xiaoyuan PEI,Bo SHANG,Jialu LI,Li CHEN,Gang DING. Shear Properties of Resin Composites Reinforced with Multilayer-connected Biaxial Weft Knitted Fabric of Carbon Fibers. Chinese Journal of Materials Research, 2015, 29(8): 613-621.

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Abstract  

Interlaminar shear properties along directions of 0 ° and 90° of resin composites reinforced with multilayer-connected biaxial weft knitted(MBWK) fabrics of carbon fibers, were investigated by shear test. The test composites involve three, four and five layer-connected MBWK fabrics respectively. It was found that the shear strength increased with the increasing fiber volume fraction. The variation of the interlaminar shear load-deflection curves tended to be linear. When the load reached the maximum value the load-deflection curve dropped suddenly, and the composites showed brittle fracture. The analysis of fracture surface showed that the structure of reinforcement has significant effect on shear properties of MBWK fabrics reinforced composites. The shear failure mode of the composites was delaminating. Meanwhile, the cracking preferred mainly along the delaminating at the interface between the fabric groups.
Key words:  composites      multilayered biaxial weft knitted fabric      polymer matrix composites      shear properties      failure mechanism     
Received:  24 October 2014     
Fund: *Supported by Municipal Science and Technology Commission of Tianjin No. 11ZCKFSF00500 and Application Basis and Front Technology Research Program of Tianjin No. 13JCYBJC16800
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Xiaoyuan PEI
Bo SHANG
Jialu LI
Li CHEN
Gang DING

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.613     OR     https://www.cjmr.org/EN/Y2015/V29/I8/613

Fig.1  MBWK fabrics interlock structure
Type No. Ply stacking sequence Fiber volume fraction/% in 0° Fiber volume fraction/% in 90° Fiber volume fraction/%
Three layers connection 1# 0/90/0/90 17.1 17.1 34.2
2# 0/90/0/90/0 24.0 20.6 44.6
3# 0/90/0/90/0/90 26.2 26.2 52.4
Four layers connection 4# 0/90/0 17.5 14.2 31.7
5# 0/90/0/90 21.7 21.7 43.4
6# 0/90/0/90/0 28.9 25.4 54.3
Five layers connection 7# 0/90 14.6 14.6 29.2
8# 0/90/0 23.5 19.9 43.4
9# 0/90/0/90 29.4 29.4 58.8
Table 1  Ply stacking sequence of the MBWK fabric composite and the fiber volume fraction (average value)
Curing temperature/℃ 130 150 160 180
Curing time/h 2 1 6 1
Table 2  Rule of cure for the MBWK fabric composite
Fig.2  Load-deflection curves of shear test along the direction of 0° (a) and 90° (b)
Type No. Strength along 0° /MPa Strength along 90° /MPa Load along 0° /kN Load along 90° /kN
Three layers connection 1# 38.5 38.10 1.75 1.73
2# 51.64 48.74 2.38 2.17
3# 56.65 56.87 2.67 2.71
Four layers connection 4# 43.89 42.89 1.90 1.87
5# 52.39 54.15 2.31 2.40
6# 57.33 58.19 2.55 2.59
Five layers connection 7# 48.83 49.18 1.39 1.38
8# 57.55 54.89 2.49 2.12
9# 61.03 58.73 2.37 2.31
Table 3  Results of the shear strength and load of the MBWK fabrics reinforced composites (average value)
Fig.3  Relationship between carbon volume fraction and shear strength of the MBWK fabrics reinforced composites
Fig.4  Fitting curves of the relationship between the shear strength and the carbon fiber volume fraction of MBWK fabrics reinforced composites along the direction 0° (a) and 90° (b)
Type R2 along 0° R2 along 90°
Three layers connection 0.997 0.914
Four layers connection 0.822 0.990
Five layers connection 0.968 0.853
Table 4  Correlation coefficient of the fitting curves between the shear strength and the carbon fiber volume fraction
Fig.5  Longitudinal section of the MBWK fabrics reinforced composites
Fig.6  Shear fracture photographs of the MBWK fabrics reinforced composites with five layer-connected and two layers
Fig.7  Shear fracture photographs of the MBWK fabrics reinforced composites with three layer-connected (a) four groups, (b) five groups, (c) six groups
Source Dependent variable: compression strength in the direction of 0 °
Type III sum of squares df Mean square F P
Corrected model 2222.964a 8 277.870 29.542 0.000
Intercept 120473.166 1 120473.166 12808.294 0.000
Reinforced structure 69.590 1 69.590 7.399 0.010
Fiber volume fraction 1956.263 6 326.044 34.664 0.000
Error 338.611 36 9.406
Total 126279.074 45
Corrected total 2561.575 44
Table 5  Tests between-subjects effects of the shear strength in the direction of 0°
Source Dependent variable: compression strength in the direction of 0 °
Type III sum of squares df Mean square F P
Corrected model 2291.114a 8 286.389 52.404 0.000
Intercept 112583.784 1 112583.784 20600.850 0.000
Reinforced structure 214.091 1 214.091 39.175 0.010
Fiber volume fraction 2209.489 6 368.248 67.383 0.000
Error 196.740 36 5.465
Total 116861.592 45
Corrected total 2487.855 44
Table 6  Tests between-subjects effects of the shear strength in the direction of 90°
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