三明治复合板材平压性能实验研究与仿真模拟

发布时间：2018-08-03 16:02

【摘要】：由于夹层结构复合材料的优异性能,近年对其研究一直在深入。本文采用高强低伸工业涤纶为原料加工机织间隔织物,对间隔织物空间进行泡沫填充,面层与树脂进行复合,制得了三明治型复合板材,并对板材的各项平压力学性能进行了实验研究和仿真模拟分析。首先进行了三明治复合板材的设计与加工。由于三明治型复合板材的压缩性能主要取决于其夹芯结构,接结纱细度、聚氨酯泡沫的填充密度不同会影响板材的平压性能,在间隔织物织造过程中,通过改变接结纱的细度,设计加工了5种接结纱细度的板材,在填充过程中通过改变填充聚氨酯泡沫材料的用量,设计加工了7种填充密度的板材,并对其平压性能进行了测试分析。其次,对实验结果进行了分析;通过分析典型载荷变形曲线,可知三明治复合板材的平压过程分为契合区、弹性区、屈服区和压实区。利用回归分析方法可知,随着接结纱细度的增加,三明治复合板材各项平压力学指标也逐渐增加;接结纱细度增加到一定程度后,由于接结纱与填充泡沫的协同作用,三明治复合板材所能承受的载荷增加量逐渐不明显。通过分析载荷变形曲线,得知随着填充密度的增加,三明治复合板材各项力学指标呈现整体上升趋势,增加到一个极限密度后各项平压力学指标开始下降,泡沫填充密度与板材平压强度呈抛物线关系,存在一个极限密度,使得三明治复合板材各项平压力学指标达到最高。最后,利用有限元分析软件AYSYS Workbench构建了三明治复合板材的仿真模型并进行了模拟实验。通过观察等效应力、应变分布云图,得知了板材在受到平压载荷时的应力、应变分布状况;通过模拟实验得出:三明治复合板材的结构对其力学性能具有增强作用;不同结构参数对三明治复合板材的力学性能的影响与实际实验结论相吻合,具有很好的可靠性。
[Abstract]:Due to the excellent properties of sandwich structure composites, the research has been going deep in recent years. In this paper, the interwoven fabric was processed with high strength and low elongation industrial polyester as raw material, the space of spacer fabric was filled with foam, and the surface layer was compounded with resin, and the sandwich composite plate was prepared. The experimental study and simulation analysis of the mechanical properties of the plate are carried out. Firstly, the sandwich composite plate was designed and processed. Because the compression performance of sandwich composite plate mainly depends on its sandwich structure, the fineness of the yarn and the filling density of the polyurethane foam will affect the flat compression performance of the sheet. In the weaving process of the spacer fabric, the fineness of the yarn is changed by changing the fineness of the bonding yarn. Five kinds of laminates with yarn fineness were designed and processed. By changing the amount of filled polyurethane foam materials, seven kinds of filling density plates were designed and processed, and their flat compression properties were tested and analyzed. Secondly, the experimental results are analyzed, and by analyzing the typical load deformation curve, it is known that the flat compression process of sandwich composite plate can be divided into fit zone, elastic zone, yield zone and compaction zone. The regression analysis method shows that with the increase of yarn fineness, the mechanical indexes of sandwich composite sheet increase gradually, and when the yarn fineness increases to a certain extent, because of the synergistic effect of bonding yarn and filling foam, The load increase of sandwich composite sheet is not obvious gradually. By analyzing the load deformation curve, it is found that with the increase of filling density, the mechanical indexes of sandwich composite plate show an overall upward trend, and after increasing to a limit density, the mechanical indexes of flat compression begin to decrease. There is a parabola relationship between the foam filling density and the flat compressive strength, and there is a limit density, which makes the mechanical index of sandwich composite plate reach the highest. Finally, the simulation model of sandwich composite plate is constructed by using finite element analysis software AYSYS Workbench and the simulation experiment is carried out. By observing the cloud diagram of equivalent stress and strain distribution, the stress and strain distribution of the plate under flat compression load is obtained, and the results of simulation experiment show that the structure of sandwich composite plate can enhance its mechanical properties. The effect of different structure parameters on the mechanical properties of sandwich composite sheet is in agreement with the experimental results and has good reliability.
【学位授予单位】：河北科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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