复合材料工字梁抗弯曲性能分析

Analysis of Bending Resistance of Composite I-beam

为了提高碳纤维复合材料工字梁的抗弯曲性能,本文针对碳纤维工字梁抗弯曲性能优化设计进行了工字梁的不同结构设计对抗弯曲性能影响的研究。采用控制变量和对比的实验方法,设计了五个不同结构的碳纤维工字梁实验样件并进行三点弯曲测试,得到了碳纤维工字梁的弯曲强度以及弯曲位移等实验数据;其次,采用ABAQUS有限元软件建立碳纤维工字梁三点弯曲模型,并对模型的有效性进行验证。然后采用该模型分析了三点弯曲过程中工字梁的受力情况,得到以下结论:碳纤维工字梁在三点弯曲时(1)上翼缘应力略大于下翼缘,适当增加上翼缘的厚度,能够提升工字梁的抗弯曲性能,增加下翼缘的厚度,对工字梁的抗弯曲性能影响微弱;(2)腹板上下两端处的应力值始终大于腹板中间位置的应力值,适当增加腹板的高度,能够提升工字梁的抗弯曲性能,增加腹板的厚度,对工字梁的抗弯曲性能影响微弱。以上研究对碳纤维工字梁结构优化设计具有一定的指导意义。

In order to improve the flexural performance of carbon fiber composite I-beams, this paper analyzes the flexural performance of carbon fiber I-beams and studies the influence of different structural designs on flexural performance of I-beams. By using control variables and comparison method, five carbon fiber I-beams with different structures were designed and tested for three-point bending. The bending strength and bending displacement of carbon fiber I-beams were obtained. Secondly, ABAQUS finite element software was used to establish a three-point bending model of carbon fiber I-beam, and the validity of the model was verified. And then use the model in the process of three point bending were analyzed by force situation of h beam, and get the following conclusions:(1) when the carbon fiber h-beam in three point bending stress slightly greater than the bottom flange, flange on increasing the thickness of the top flange, can improve h beam bending resistance, increase the thickness of the bottom flange, weak effects on h beam bending resistance;(2) the stress value at the upper and lower ends of the web is always greater than the stress value in the middle of the web. Appropriately increasing the height of the web can improve the flexural performance of I-beam, increase the thickness of the web, and have a slight effect on the flexural performance of I-beam. The above research has certain guiding significance for the structural optimization design of carbon fiber I-beam.