本文關(guān)鍵詞：玻璃纖維增強(qiáng)聚丙烯材料的立體混合法工藝及實(shí)驗(yàn)研究　出處：《湖南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 玻璃纖維增強(qiáng)聚丙烯 立體混合法 應(yīng)變率效應(yīng) 層合熱壓

【摘要】：隨著玻璃纖維增強(qiáng)聚丙烯(GF/PP)復(fù)合材料的應(yīng)用越為廣泛,有關(guān)其制氈工藝、力學(xué)性能和力學(xué)特性的研究工作也變得尤為重要。其制氈工藝的優(yōu)劣性關(guān)系到后續(xù)板材熱壓成型工藝的復(fù)雜性及可靠性。而GF/PP復(fù)合材料本身的力學(xué)性能與力學(xué)特性也會隨著其制氈工藝、制作環(huán)境與保存條件等產(chǎn)生諸多的不確定性變化。本文研究了GF/PP復(fù)合材料的立體混合法制氈工藝,通過氣流成網(wǎng)工藝,對GF/PP復(fù)合材料的基體結(jié)構(gòu)進(jìn)行改進(jìn),并進(jìn)行相關(guān)的力學(xué)實(shí)驗(yàn)分析,從力學(xué)性能上驗(yàn)證了立體混合法工藝的優(yōu)勢與可靠性。另外,本文也對GF/PP復(fù)合材料的應(yīng)變率敏感特性進(jìn)行了實(shí)驗(yàn)研究分析,以滿足其在碰撞與安全領(lǐng)域的應(yīng)用。主要的工作如下:將PP纖維與GF經(jīng)立體混合法制備成連續(xù)針刺氈。結(jié)果表明:所制立體混合氈中,PP纖維與GF混合均勻,纖維的損傷、斷裂情況較少,氈層形成較為穩(wěn)定的立體結(jié)構(gòu),有利于后續(xù)板材的熱壓成型。采用層合熱壓法將立體混合氈壓制成板材,并對其進(jìn)行力學(xué)性能測試。結(jié)果表明:在同等克重(每平方米重量)和GF含量的條件下,其拉伸強(qiáng)度、彎曲強(qiáng)度、抗沖擊強(qiáng)度都較傳統(tǒng)工藝所制板材有了較大幅度的提升。通過層合熱壓法將GF氈與PP薄膜復(fù)合成不同GF含量的板材,在不同的加載速率下進(jìn)行拉伸實(shí)驗(yàn),作出應(yīng)力應(yīng)變曲線。采用BURGERS粘彈性模型擬合預(yù)測對應(yīng)的應(yīng)力應(yīng)變曲線,并與實(shí)驗(yàn)曲線相比較。結(jié)果表明:該材料在低應(yīng)變率范圍內(nèi)對應(yīng)變率是敏感的,隨應(yīng)變率的增加,其斷裂拉伸應(yīng)力值增大,隨GF含量的增加,其所對應(yīng)的應(yīng)變率效應(yīng)反而有所下降。BURGERS模型能夠較為合理的擬合預(yù)測出該材料的本構(gòu)關(guān)系,從理論上驗(yàn)證了GF/PP復(fù)合材料的應(yīng)變率敏感特性。
[Abstract]:With the increasing application of glass fiber reinforced PP / PP composites, the process of making felt is concerned. The study of mechanical properties and mechanical properties has also become particularly important. The quality of the felting process is related to the complexity and reliability of the subsequent hot pressing process of sheet metal. The mechanical properties of GF/PP composites are also very important. And mechanical properties will also follow its felting process. There are many uncertain changes in the manufacturing environment and preservation conditions. In this paper, the three-dimensional mixing felting process of GF/PP composites is studied, and the airflow netting process is studied. The matrix structure of GF/PP composites was improved, and the related mechanical experiments were carried out to verify the advantages and reliability of the stereoscopic mixing process. The strain rate-sensitive properties of GF/PP composites are also studied experimentally. The main work is as follows: PP fiber and GF were prepared by stereoscopic mixing method to form continuous needle felt. PP fiber and GF mixed evenly, fiber damage, less fracture, tapetum formation of a more stable three-dimensional structure. It is advantageous to the hot pressing forming of the subsequent sheet metal. The solid mixed felt is pressed into the plate by the laminated hot pressing method. The results show that the tensile strength and bending strength of the material are under the condition of equal g weight (per square meter weight) and GF content. Compared with the traditional process, the impact strength of GF felt was greatly improved. The GF felt was combined with PP film to form different GF content sheet by laminating hot pressing method, and the tensile test was carried out at different loading rates. The stress-strain curve was obtained and the corresponding stress-strain curve was fitted by BURGERS viscoelastic model. The results show that the material is sensitive to the strain rate in the range of low strain rate. With the increase of the strain rate, the fracture tensile stress value increases and the GF content increases. On the contrary, the strain rate effect of the material decreases. The Burgers model can fit and predict the constitutive relation of the material reasonably. The strain rate sensitivity of GF/PP composites is verified theoretically.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ325.14;TB332

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