VOID EFFECTS ON THE INTERLAMINAR SHEAR-STRENGTH OF UNIDIRECTIONAL GRAPHITE-FIBER-REINFORCED COMPOSITES
VOID EFFECTS ON THE INTERLAMINAR SHEAR-STRENGTH OF UNIDIRECTIONAL GRAPHITE-FIBER-REINFORCED COMPOSITES
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DOI：
10.1177/002199839202601006
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发表时间：
1992-01-01
影响因子：
2.9
通讯作者：
FRIMPONG, S
中科院分区：
文献类型：
--
作者：
BOWLES, KJ;FRIMPONG, S
研究了孔隙对聚酰亚胺基复合材料层间剪切强度的影响。选择石墨/PMR-15复合材料进行研究，是因为在这种材料的加工过程中积累了大量的经验。复合材料的密度和纤维含量的30多个不同的层压板进行了测量沿着与层间剪切强度。计算空隙含量，并使用金相学中使用的显微镜技术记录空隙几何形状和分布。ILSS和复合材料密度之间存在良好的经验相关性，但ILSS和密度之间最可接受的关系是幂方程，与理论推导的表达式非常相似。随着空隙含量的增加，观察到强度数据的分散性增加。在具有低空隙含量的层压材料中，空隙似乎在层压材料的一个区域中更加分离。我们发现，无空隙的复合材料可以在匹配的金属模具在压力大于1.4 MPa和小于6.9 MPa的加工。
A study was conducted to evaluate the effect of voids on the interlaminar shear strength (ILSS) of a polyimide matrix composite system. The graphite/PMR-15 composite was chosen for study because of the extensive amount of experience that has been amassed in the processing of this material. Composite densities and fiber contents of more than 30 different laminates were measured along with interlaminar shear strengths. Void contents were calculated and the void geometry and distribution were noted using microscope techniques such as those used in metallography. A good empirical correlation between ILSS and composite density was found. However, the most acceptable relationship between the ILSS and density was found to be a power equation that closely resembles theoretically derived expressions. As the void content increased, an increase in scatter in the strength data was observed. In laminates with low void content, the voids appeared to be more segregated in one area of the laminate. We found that void-free composites could be processed in matched metal die molds at pressures greater than 1.4 MPa and less than 6.9 MPa.