本文選題：復(fù)合材料泡沫夾芯板 + 表面處理　； 參考：《武漢理工大學》2015年碩士論文

【摘要】：復(fù)合材料泡沫夾芯板不僅具備比強度高、比模量大、抗沖擊性能強等良好的力學特點,而且具有隔熱、隔音、減振等功能特點,因此,在航空、航天、船舶、能源、交通等領(lǐng)域日益受到關(guān)注。為了滿足各領(lǐng)域越來越高的工況要求,提高芯材的力學性能成為提高夾芯板整體性能的重要方式之一。將泡沫平板表面處理,即在泡沫表面切割出不同尺寸及分布的切縫,產(chǎn)生的芯材在夾芯板成型后因切縫中的樹脂而使力學性能獲得提高。目前,經(jīng)表面處理的芯板應(yīng)用面越來越廣,但芯材表面處理方式對夾芯板力學性能的影響的相關(guān)研究還較少見。本文提出表面處理芯材夾芯板的二步結(jié)構(gòu)分析法。第一步,以薄片模型為理論模型,結(jié)合ANSYS有限元軟件對含樹脂的芯材的力學性能進行預(yù)測;第二步將芯材看作兩層(樹脂增強芯材子層1和純PVC芯材子層2,某些處理方式中可不含有純芯材層),計算整體夾芯板的力學性能,并通過實驗驗證,證實了該方法的有效性。為進一步優(yōu)化設(shè)計,考察了切縫深度、寬度、間距及分布對復(fù)合材料夾芯板的彎曲、平拉、平壓等力學性能的影響。實驗中,利用真空灌注VARI(Vacuum Assisted Resin Infusion)成型工藝制備了含不同表面處理方式的芯材的復(fù)合材料夾芯板,測定夾芯板試樣的彎曲、平拉、平壓性能,根據(jù)測試結(jié)果分析芯材表面處理方式對夾芯板力學性能的影響。主要研究內(nèi)容和結(jié)論如下:(1)以從單向單面切割板ODC(One Directional Coutour)為例,提取芯材子層1的代表性體積單元(單胞),分別用薄片模型理論和ANSYS模擬計算芯材子層1的等效拉伸模量、剪切模量等基本力學參數(shù),結(jié)果對比分析表明:通過數(shù)值模擬計算單胞的力學性能預(yù)測芯材的等效力學性能的方法是合理的;(2)選取芯材多種表面處理方式的代表性尺寸,分別從經(jīng)表面處理的芯板中提取單胞,利用ANSYS計算芯材的力學性能。結(jié)果表明,芯材經(jīng)過表面處理后,力學性能得到提高;(3)根據(jù)國標試驗分別模擬計算和測定夾芯板試樣的彎曲、平拉、平壓性能,模擬結(jié)果與實驗結(jié)果符合較好,說明數(shù)值模擬方法是可靠的。所以,首先通過數(shù)值預(yù)測樹脂增強芯材的力學性能,再將含樹脂的芯材作為復(fù)合材料多層結(jié)構(gòu)中的一層進行整體夾芯板的力學分析的方法是合理可行的;(4)為了優(yōu)化設(shè)計,模擬分析了不同的表面處理方式對夾芯板的力學性能的影響。結(jié)果表明,對于本文研究的夾心結(jié)構(gòu),切縫深度和切縫間距對夾芯板的剛度影響較大,對平拉和平壓強度影響較低;切縫寬度可顯著提高夾芯板的平拉和平壓強度,對夾芯板剛度無影響;組合型表面處理能夠提高夾芯板的剛度、平拉和平壓強度。
[Abstract]:Composite foam sandwich panels not only have good mechanical characteristics, such as high specific strength, high specific modulus, strong impact resistance and so on, but also have the functions of heat insulation, sound insulation, vibration absorption and so on. Therefore, in aviation, aerospace, ship, energy, etc. Traffic and other fields are getting more and more attention. In order to meet the requirements of higher and higher working conditions in various fields, improving the mechanical properties of core materials has become one of the important ways to improve the overall performance of sandwich panels. The surface of foam plate was treated by cutting out different size and distribution of slits on the foam surface, and the mechanical properties of the core material were improved because of the resin in the cutting joint after the core was formed. At present, the surface treatment of core panels is more and more widely used, but the influence of core surface treatment on the mechanical properties of sandwich panels is rare. In this paper, a two-step structure analysis method for surface treatment core sandwich panel is presented. The first step is to predict the mechanical properties of the core material containing resin by using the thin sheet model as the theoretical model and the ANSYS finite element software. In the second step, the core material is regarded as two layers (resin reinforced core material sub-layer 1 and pure PVC core material sub-layer 2), some treatment methods can not contain pure core material layer, the mechanical properties of the whole sandwich panel are calculated, and the validity of the method is verified by experiments. In order to further optimize the design, the effects of depth, width, spacing and distribution of cutting joint on the mechanical properties of composite sandwich panels, such as bending, flat drawing and flat compression, were investigated. In the experiment, the composite sandwich panels with different surface treatment methods were prepared by vacuum perfusion VARI(Vacuum Assisted Resin Infusion) molding process. The bending, flat drawing and flat compression properties of sandwich plate samples were measured. According to the test results, the effect of core surface treatment on the mechanical properties of sandwich panel is analyzed. The main contents and conclusions are as follows: (1) taking the unidirectional cutting plate ODC(One Directional Coutouras as an example, the representative volume unit of the core sublayer 1 (unit cell model theory and ANSYS simulation is used to calculate the equivalent tensile modulus of the core sublayer 1, respectively. Comparing and analyzing the basic mechanical parameters such as shear modulus, the results show that the method of predicting the equivalent mechanical properties of the core material by numerical simulation is a reasonable one) and the representative size of various surface treatment methods of the core material is selected. The unit cells were extracted from the surface treated core and the mechanical properties of the core were calculated by ANSYS. The results show that after surface treatment, the mechanical properties of the core material are improved. According to the national standard test, the bending, flat drawing and flat compression properties of the sandwich plate samples are calculated and measured respectively. The simulation results are in good agreement with the experimental results. It is shown that the numerical simulation method is reliable. Therefore, it is reasonable and feasible to analyze the mechanical properties of composite sandwich panel by numerical prediction of the mechanical properties of resin reinforced core material, and then to optimize the design by using the resin core material as a layer of composite multilayer structure. The effects of different surface treatments on the mechanical properties of sandwich panels were simulated and analyzed. The results show that, for the sandwich structure studied in this paper, the stiffness of sandwich panel is greatly affected by the depth of cutting joint and the spacing of cutting joint, and the influence on the flat tension and compression strength is low, and the width of cutting joint can significantly improve the flat tension and compression strength of sandwich panel. The composite surface treatment can improve the stiffness of sandwich panel, and the flat tension and compression strength can be improved.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB33

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