本文關(guān)鍵詞：Z-pin增強(qiáng)帽型加筋壁板連接機(jī)理與力學(xué)性能研究　出處：《南京航空航天大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 復(fù)合材料 帽型加筋壁板 Z-pin 連接性能 力學(xué)性能

【摘要】：本文以某新型高教機(jī)帽型加筋壁板Z-pin三維增強(qiáng)為應(yīng)用背景,開(kāi)展了Z-pin增強(qiáng)帽型加筋壁板結(jié)構(gòu)的成型工藝、增強(qiáng)機(jī)理和力學(xué)性能研究。提出了Z-pin增強(qiáng)帽型加筋壁板結(jié)構(gòu)的成型工藝方案,成功制備出Z-pin增強(qiáng)帽型加筋壁板試樣,并對(duì)其進(jìn)行了拉伸性能、彎曲性能及沖擊性能測(cè)試分析,探究了Z-pin對(duì)帽型加筋壁板筋條與蒙皮界面連接的增強(qiáng)機(jī)理,獲得了不同參數(shù)對(duì)其性能的影響規(guī)律,為Z-pin增強(qiáng)在航空航天領(lǐng)域加筋壁板上的實(shí)際應(yīng)用奠定了基礎(chǔ)。(1)采用金屬-硅橡膠軟模制備Z-pin增強(qiáng)帽型加筋壁板工藝方案,建立了硅橡膠膨脹壓力模型,分析得出最佳工藝間隙為0.4mm,并根據(jù)此參數(shù)設(shè)計(jì)了相應(yīng)的金屬陰模及橡膠芯模;通過(guò)單pin拔出橋率和凸臺(tái)剪切試驗(yàn),研究了Z-pin與基體結(jié)合性能及Z-pin的剪切性能;通過(guò)對(duì)Z-pin植入工藝進(jìn)行改進(jìn),提出了一種精確控制Z-pin植入角度、植入深度的Z-pin植入工藝方法;探索出適于Z-pin增強(qiáng)帽型加筋壁板的熱膨脹-熱壓機(jī)混合固化工藝,成功制備出高質(zhì)量的Z-pin增強(qiáng)帽型加筋壁板試樣。(2)開(kāi)展了Z-pin增強(qiáng)帽型加筋壁板接頭的面外拉伸性能研究。研究結(jié)果表明:Z-pin對(duì)帽型加筋壁板筋條與蒙皮界面拉脫強(qiáng)度有顯著增強(qiáng)作用;隨著Z-pin體積分?jǐn)?shù)的增加,Z-pin增強(qiáng)試樣的拉脫強(qiáng)度呈先升高后降低趨勢(shì),相比于不含Z-pin增強(qiáng)試樣最高可提高31.15%;Z-pin植入直徑的變化對(duì)帽型接頭拉脫強(qiáng)度的影響不顯著;隨著加載跨距的增加,Z-pin增強(qiáng)帽型接頭的拉脫強(qiáng)度呈降低趨勢(shì),Z-pin的主要失效模式由拔脫失效轉(zhuǎn)為剪切失效;除缺陷位于R角內(nèi)部外,含預(yù)制缺陷的Z-pin增強(qiáng)帽型接頭試樣的拉脫強(qiáng)度均高于不含Z-pin增強(qiáng)試樣。(3)開(kāi)展了Z-pin增強(qiáng)帽型加筋壁板試樣的彎曲性能研究。研究結(jié)果表明:隨著Z-pin體積分?jǐn)?shù)的增加,Z-pin增強(qiáng)帽型加筋壁板的彎曲性能提高,經(jīng)理論分析得到當(dāng)Z-pin體積分?jǐn)?shù)為2.6%時(shí),試樣彎曲性能最好;Z-pin植入直徑的變化對(duì)帽型加筋壁板的彎曲峰值力影響不明顯;當(dāng)Z-pin增強(qiáng)區(qū)長(zhǎng)度為總長(zhǎng)度的48%時(shí),Z-pin增強(qiáng)帽型加筋壁板的彎曲峰值力與全部植入Z-pin時(shí)基本相當(dāng)。(4)開(kāi)展了Z-pin增強(qiáng)帽型加筋壁板沖擊性能研究,結(jié)合超聲C掃描檢測(cè)方法及沖擊后拉伸試驗(yàn)研究了Z-pin對(duì)帽型加筋壁板低速?zèng)_擊的增強(qiáng)機(jī)理。結(jié)果表明,Z-pin能明顯提高帽型加筋壁板的抗沖擊性能及剩余拉脫強(qiáng)度;隨著Z-pin體積分?jǐn)?shù)的增加,沖擊后試樣的分層面積減小、剩余拉脫強(qiáng)度增加,當(dāng)體積分?jǐn)?shù)為1.0%時(shí),10J沖擊能量對(duì)試樣的拉脫強(qiáng)度幾乎沒(méi)有影響;增加Z-pin的直徑,沖擊后試樣的分層面積增加,剩余拉脫強(qiáng)度減小;隨著沖擊能量的增加,沖擊后試樣的分層面積增加,剩余拉脫強(qiáng)度減小,沖擊能量為18J試樣的損傷面積達(dá)到筋條與蒙皮連接總面積的82.0%,剩余拉脫強(qiáng)度降低為未沖擊試樣的25.1%;當(dāng)沖擊帽型筋條中心部位時(shí),10J沖擊能量對(duì)試樣拉伸性能幾乎沒(méi)有影響。
[Abstract]:This paper takes a new type of higher education hat stiffened panel of three dimensional contrast enhanced Z-pin as the application background, the forming process of Z-pin reinforced hat stiffened panel structure, reinforced mechanism and mechanical properties. The enhanced Z-pin scheme forming hat stiffened panel structure, successfully prepared Z-pin enhanced cap type wainscot samples, and has carried on the analysis of tensile properties, flexural strength and impact performance test, to explore the Z-pin on hat stiffened panel ribs and skin interface enhancement mechanism, the influence of different parameters on its performance, which laid the foundation for the enhancement of Z-pin application in the field of aerospace reinforcement on the wall. (1) preparation of Z-pin reinforced panel process hat stiffened by metal - silicon rubber soft molding, set up the pressure model of silicon rubber expansion, analysis of the optimum clearance for the 0.4mm, and according to the design parameters The metal mold and the corresponding rubber core mould; through the single pin pull out the bridge boss rate and shear test, the shear behavior of Z-pin combined with the matrix properties and Z-pin; the Z-pin implantation process improvement, this paper proposes a precise control of Z-pin angle, Z-pin implantation process of insertion depth exploration; for enhanced Z-pin hat stiffened panel thermal expansion - mixed hot press curing process, successfully prepared high quality Z-pin reinforced hat stiffened panel specimens. (2) carried out a study to enhance the performance of Z-pin hat stiffened panel joint surface tension. The results show that Z-pin significantly enhanced the pull strength hat stiffened panel ribs and skin interface; with the increase of the volume fraction of Z-pin Z-pin enhanced tensile strength of samples increased at first and then decreased, compared to the sample without Z-pin enhanced 31.15% higher Z-pin implantation; The influence of the diameter change of cap type joint tensile strength is not significant; with the increase of the loading span, Z-pin enhanced tensile strength cap type joints decreased, the main failure modes of Z-pin by pulling out failure to shear failure; in addition to defects in R internal angle, tensile strength of welded joint with a prefabricated cap type missing in the enhanced Z-pin were higher than those without Z-pin were increased. (3) carried out research on the bending performance of Z-pin reinforced hat stiffened panel specimens. The results show that with the increase of the volume fraction of Z-pin Z-pin to enhance the bending of a hat stiffened panel can be improved by theoretical analysis, when the volume fraction of Z-pin was 2.6% when the bending properties of samples is best; effects of Z-pin on implant diameter hat stiffened panel bending force peak is not obvious; when Z-pin enhanced zone length is the total length of 48%, Z-pin enhanced hat stiffened panel bending peak force With all the Z-pin implantation is quite basic. (4) carried out a study on impact strength of reinforced Z-pin hat stiffened panel, after tensile test studied the enhancement mechanism of Z-pin on hat stiffened panel with low velocity impact of ultrasonic C scanning detection method and impact. The results show that Z-pin can significantly improve the impact properties and residual tensile strength hat stiffened panel; with the increase of the volume fraction of Z-pin samples after impact delamination area decreases, increase the residual tensile strength, when the volume fraction of 1%, almost no influence on the tensile strength of 10J sample energy impact; increased Z-pin diameter, impact delamination area of the specimen increases, reduce the residual tensile strength; with the increase of the impact energy, impact delamination area of the specimen increases, reduce the residual tensile strength, the impact energy for the damage area of 18J specimen reached the ribs and skin with 82% of the total area, the remaining Pull off strength has been reduced to 25.1% when the position of impact test specimens; the impact of cap type rib center, 10J impact energy on tensile performance and almost no effect.

【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：V214;V262

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