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Response of natural sisal reinforced polyester composites to three-point and four-point bending

机译：天然剑麻增强聚酯复合材料对三点和四点弯曲的响应

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摘要

In engineering, prevention of failure of materials is of cardinal importance. Once failure can be predicted and anticipated fairly correctly, timely corrective measures can be taken to avert catastrophes. This way, costs would be reduced and profits maximized. Some of the difficult materials to predict the failure for are natural fibre reinforced composites due to the fact that fibres do not all fail at the same time with load value. Some fibres fail earlier than others, thereby exhibiting lesser failure values than theoretically calculated. In this research, polyester resin was reinforced with natural sisal using the hand lay-up process. Three types of reinforcement mats were used. Two were handmade while one was machine made. Composites of varying sisal volume fractions were made. Pressure of 15 – 20 bar was applied to the slates for 15 minutes before allowing them to cure at room temperature for 24 hours. Pressure was applied in order to eliminate air bubbles and also to ensure an even and flat resultant surface. Test specimens from the resultant composites were subjected to three-point and four-point bending to determine the Young's modulus, E. The results revealed that E values for all the composites were lower that what was theoretically calculated from the volume fractions; the hand-made mats resulted in lower E values than the machine-made mat; it was also observed that the higher the volume fraction, the higher the E value obtained experimentally.
机译：在工程中，防止材料故障至关重要。一旦可以正确正确地预测和预期到故障，就可以采取及时的纠正措施来避免灾难。这样，将降低成本，并最大化利润。天然纤维增强复合材料是某些难于预测失效的材料，原因是纤维不会随负荷值同时失效。一些光纤比其他光纤更早失效，因此其失效值比理论计算的要小。在这项研究中，聚酯树脂通过手工铺网工艺用天然剑麻增强。使用了三种类型的增强垫。两个是手工制作的，而一个是机器制作的。制成各种剑麻体积分数的复合材料。在板岩上施加15 – 20 bar的压力15分钟，然后在室温下固化24小时。施加压力是为了消除气泡，并确保得到平坦且平坦的表面。将所得复合材料的试样进行三点和四点弯曲，以确定杨氏模量E。结果表明，所有复合材料的E值均低于理论上由体积分数计算得出的值。手工制作的垫子产生的E值比机器制作的垫子低。还观察到，体积分数越高，通过实验获得的E值越高。

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