Effect of span-thickness ratio on bending properties of high-strength glass fiber reinforced composite unidirectional plate
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摘要: 采用三点弯曲实验测试不同跨厚比的S6C10-800/AC318复合材料单向板（以下简称单向板）的弯曲性能，研究跨厚比对单向板弯曲强度、弯曲模量的影响，分析试样断裂模式和弯曲破坏机制，确定单向板三点弯曲测试的临界跨厚比。结果表明：单向板弯曲强度随着跨厚比的增加而不断增加，弯曲模量随着跨厚比的增加先增大后减小；单向板的断裂模式于跨厚比α＝20时发生转变，单向板分层损伤程度随着跨厚比的增加逐渐降低，但劈裂程度增加；α≤20时跨厚比越大，应力-应变曲线越符合线性关系；α＞20时，应力-应变曲线不再符合线性关系；得到了任意跨厚比下单向板弯曲强度的预测公式及单向板的三点弯曲破坏的失效判定准则。
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关键词:
- 跨厚比 /
- S6C10-800/AC318复合材料 /
- 单向板 /
- 弯曲性能 /
- 弯曲失效准则
Abstract: Based on the three-point bending test, the bending performances of S6C10-800/AC318 composite unidirectional plates with different span-thickness ratios (hereinafter referred to as unidirectional plates) were tested, and the effect of span-thickness ratio on the bending strength and bending modulus of unidirectional plate was studied. The influence and fracture mode of the specimens with different span-thickness ratios were analyzed to obtain the bending failure mechanism, and the critical span-thickness ratio of three-point bending test of unidirectional plate was determined. The results show that the bending strength of the unidirectional plate increases with the increase of the span-thickness ratio, and the bending modulus first increases and then decreases with the increase of the span-thickness ratio. The fracture mode of the unidirectional plate changes when the span-thickness ratio α＝20, and the degree of delamination damage of unidirectional plate gradually decreases with the increase of span-thickness ratio, but the degree of splitting increases. When α≤20, the stress-strain curve conforms to the linear relationship with the increase of the span-thickness ratio, but when α＞20, the stress-strain curve does not conform to the linear relationship. Therefore, the predicting formula of bending strength of unidirectional plate under arbitrary span-thickness ratio and a failure criterion for three-point bending test of unidirectional plate are obtained. It is recommended that the critical span-thickness ratio of the three-point bending performance test of unidirectional plate is 20. This is of great significance for optimizing the three-point bending test method of glass fiber composite materials to more accurately test the bending performance of composite materials. -
图 1 不同跨厚比单向板的典型弯曲应力-应变曲线
Figure 1. Typical stress-strain curves of unidirectional plates with different span-thickness ratios
图 2 不同跨厚比的典型断裂模式（a）α = 10；（b）α = 16；（c）α = 20；（d）α = 26；（e）α = 32；（1）受拉伸的下表面；（2）受压缩的上表面
Figure 2. Typical fracture modes with different span-to-thickness ratios （a） α = 10；（b） α = 16；（c） α = 20；（d） α = 26；（e） α = 32；（1）lower surface of specimen under tension； (2) upper surface of specimen under compression
图 3 不同跨厚比的单向板破坏时跨距中点的层间剪应力
Figure 3. Interlaminar shear stress at the span midpoint of unidirectional plates with different span-thickness ratios
图 4 单向板的弯曲强度与跨厚比的关系
Figure 4. Relationship between the bending strength and the span-thickness ratio of a unidirectional plate
图 5 基于实验数据改进Hashin准则的拟合结果
Figure 5. Improving fitting results of Hashin criterion based on experimental data
表 1 单向板力学性能
Table 1. Mechanical properties of unidirectional plate
Xt /MPa Xc /MPa Yt /MPa Yc /MPa S12 /MPa S13 /MPa 1961 1216 73.3 223 65.7 94 
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表 2 不同跨厚比试样的弯曲强度及破坏载荷下对应的层间剪应力
Table 2. Bending strength with different span-to-thickness ratios and corresponding interlaminar shear stress under failure load
Span-thickness ratio Average value of failure load /N Bending strength /MPa Interlaminar shear stress
at fracture /MPa10 1943.33±89.75 1359.70±39.85 69.19±2.03 16 1838.33±81.73 2064.00±123.93 66.46±4.02 20 1595.00±106.58 2351.85±179.75 57.37±3.84 26 1221.67±67.93 2506.52±166.65 43.10±2.58 32 936.50±75.75 2612.28±179.17 32.88±1.87
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表 3 不同跨厚比的复合材料弯曲模量
Table 3. Bending modulus of composite materials with different span-thickness ratios
Span-thickness
ratioBending
modulus /GPaCoefficient of
variation /%10 59.25±4.51 8.32 16 72.38±3.56 5.40 20 74.05±4.48 6.60 26 68.60±2.49 3.95 32 66.75±2.81 4.64
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