Fiber-Matrix Adhesion and Its Effect on Composite Mechanical Properties: II. Longitudinal (0°) and Transverse (90°) Tensile and Flexure Behavior of Graphite/Epoxy Composites
Fiber-Matrix Adhesion and Its Effect on Composite Mechanical Properties: II. Longitudinal (0°) and Transverse (90°) Tensile and Flexure Behavior of Graphite/Epoxy Composites
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DOI：
10.1177/002199839102500802
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发表时间：
1991-08
影响因子：
2.9
通讯作者：
M. Madhukar;L. Drzal
中科院分区：
文献类型：
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作者：
M. Madhukar;L. Drzal
增强纤维和增强纤维所在的聚合物基体之间的最佳界面粘合强度对于可接受的复合材料机械性能和性能至关重要。只有清楚地了解纤维基体粘合水平与复合材料的机械和断裂行为之间的关系，才能优化界面粘合强度。本研究建立了石墨/环氧树脂复合材料的纤维-基体界面剪切强度与 0° 和 90° 拉伸和弯曲性能之间的关系。选择了明确定义和表征的石墨纤维/环氧树脂系统，其中通过使用相同的石墨纤维通过表面处理和光洁度来改变纤维和基体之间的粘合水平。与这些变化相关的纤维和基体之间的粘附水平导致纤维-基体界面剪切强度（ISS）增加超过两倍，而纤维和基体性能保持不变。实验结果表明，纤维表面改性对拉伸模量和弯曲模量以及纤维主导性能没有太大影响。然而，由基体和界面特性控制的强度和最大应变对纤维表面改性高度敏感。此外，还发现主要失效模式受到纤维基体界面剪切强度的影响。
An optimum level of interfacial bond strength between reinforcing fiber and a polymeric matrix in which it is placed is essential for acceptable composite mechanical properties and performance. The interfacial bond strength can be optimized only when the relationship between the level of fiber-matrix adhesion and the mechanical and fracture behavior of composites is clearly understood. This study establishes the relationship between the fiber-matrix interfacial shear strength and 0° and 90° tensile and flexure properties of graphite/epoxy composites. A well defined and characterized graphite fiber/epoxy system was chosen in which the level of adhesion between fiber and matrix was changed by using the same graphite fibers through the use of surface treatment and finish. The level of adhesion between the fiber and matrix associated with these changes resulted in an increase of fiber-matrix interfacial shear strength (ISS) by over a factor of two while the fiber and matrix properties remained unchanged. The experimental results demonstrated that the fiber surface modification did not have much effect on the tensile and flexural moduli and on the fiber dominated properties. However, the strengths and maximum strains that are governed by the matrix and interface properties were highly sensitive to the fiber surface modification. In addition, the major failure modes were also found to be affected by the fiber-matrix interfacial shear strength.