本文關(guān)鍵詞：界面性能對原位顆粒增強(qiáng)鋁基復(fù)合材料彈性模量的影響　出處：《江蘇大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鋁基復(fù)合材料 實(shí)驗(yàn)研究 有限元 彈性模量 界面 預(yù)測

【摘要】：原位顆粒增強(qiáng)鋁基復(fù)合材料以其優(yōu)異的力學(xué)性能和物理性能、易于制造加工以及顯著的低成本優(yōu)勢而成為復(fù)合材料研究熱點(diǎn)之一。界面性能對復(fù)合材料的彈性模量有著顯著的影響,而目前的研究對象多是外加顆粒增強(qiáng)鋁基復(fù)合材料,本文對原位顆粒增強(qiáng)鋁基復(fù)合材料的微觀組織及其彈性模量進(jìn)行了實(shí)驗(yàn)研究。在實(shí)驗(yàn)研究的基礎(chǔ)上,建立三維及二維RVE有限元模型,結(jié)合混合律模型,數(shù)值模擬計(jì)算了界面等微觀結(jié)構(gòu)參數(shù)對原位顆粒增強(qiáng)鋁基復(fù)合材料彈性模量的影響。通過實(shí)驗(yàn)測量值與有限元模型模擬值相對比,驗(yàn)證了有限元模型的合理性,并運(yùn)用該模型模擬預(yù)測了界面性能及界面模量梯度對原位SiCp/7075復(fù)合材料彈性模量的影響規(guī)律,具體研究內(nèi)容如下：(1)采用熔體反應(yīng)法實(shí)驗(yàn)制備了原位TiB2/A356復(fù)合材料,用JSM-7001F掃描電鏡對其進(jìn)行了掃描觀察,并用電子萬能試驗(yàn)機(jī)對各組試樣進(jìn)行了拉伸實(shí)驗(yàn),測得了其彈性模量。建立三維及二維RVE有限元模型,結(jié)合混合律模型,數(shù)值模擬計(jì)算了界面性能對原位TiB2/A356復(fù)合材料彈性模量的影響并得出復(fù)合材料細(xì)觀單元應(yīng)力-應(yīng)變場分布細(xì)節(jié)。將實(shí)驗(yàn)測得TiB2/A356復(fù)合材料彈性模量值與數(shù)值模型預(yù)測值相比較,驗(yàn)證了所建立有限元模型的合理性,并用該模型預(yù)測了界面性能對顆粒體積分?jǐn)?shù)比較大的TiB2/A356復(fù)合材料彈性模量的影響情況。(2)應(yīng)用經(jīng)過實(shí)驗(yàn)驗(yàn)證的有限元模型數(shù)值模擬研究了界面性能對原位SiCp/7075復(fù)合材料彈性模量的影響規(guī)律,研究發(fā)現(xiàn)：界面性能可以顯著的影響復(fù)合材料的彈性模量,并且顆粒體積分?jǐn)?shù)越大界面性能的影響越顯著,界面模量與基體模量需要滿足的比值與顆粒體積分?jǐn)?shù)有關(guān),并不局限于20%-30%之間；當(dāng)顆粒體積分?jǐn)?shù)較大時,與界面純彈性相比,界面彈塑性會較明顯的降低原位鋁基復(fù)合材料的彈性模量。(3)由于界面層的性能是隨著位置而連續(xù)變化的,本文假設(shè)界面模量梯度函數(shù)為一次函數(shù),并在數(shù)值計(jì)算時,對該函數(shù)進(jìn)行離散化,采用對界面進(jìn)行分層的方法建立了界面模量梯度變化的軸對稱RVE模型,研究發(fā)現(xiàn),界面模量呈梯度變化的原位鋁基復(fù)合材料彈性模量的預(yù)測結(jié)果要比對應(yīng)的均勻界面層的復(fù)合材料彈性模量預(yù)測值要小。
[Abstract]:In situ particle reinforced aluminum matrix composites with excellent mechanical properties and physical properties, easy manufacturing and processing as well as significant cost advantage and become a hot research topic. The composite has a significant impact on the interfacial properties of elastic modulus of composite materials, and the research object is present with particle reinforced aluminum matrix composite in this paper the in situ particle reinforced microstructure and elastic modulus of aluminum matrix composites were studied. On the basis of experimental results, RVE finite element model of 2D and 3D, with mixed law model, numerical simulation of interface microstructure parameters such as elastic modulus of reinforced aluminum matrix composites in situ with finite particles. Element model of simulation is obtained by comparing the experimental measurements to verify the rationality of the finite element model, and using the model to simulate the interfacial properties and mask industry forecast Effect of gradient on the elastic modulus of in situ SiCp/7075 composites, the specific contents are as follows: (1) TiB2/A356 in situ composites were prepared by melt reaction method experiment, the scanning observation of the JSM-7001F scanning electron microscope and electronic universal testing machine samples of each group were measured the tensile test, the elastic modulus the establishment of RVE. The finite element model of 2D and 3D, with mixed law model, numerical simulation of the influence of interfacial properties on the elastic modulus of TiB2/A356 in situ composite and the composite meso element stress-strain field distribution in detail. The measured TiB2/A356 composite elastic modulus values are compared with the numerical prediction model to verify the rationality of the finite element model is established, and the model was used to predict the interfacial performance of the elastic modulus of TiB2/A356 composites than the larger particle volume fraction. Ring. (2) numerical application after experimental verification of the finite element model are investigated by simulation, interfacial properties on the elastic modulus of SiCp/7075 in situ composite research found that the interface performance can significantly affect elastic modulus of composite materials, and the effects of the particle volume fraction is the interface properties of the more significant interface matrix modulus ratio to meet the ratio and the volume fraction of the particles, is not limited to 20%-30%; when the particle volume fraction is larger, compared with the pure elastic interface, the interface plastic will reduce the elastic modulus of in-situ aluminum matrix composite is obvious. (3) the performance of the interface layer is with the continuous change of the position. It is assumed that the surface modulus gradient function as a function, and the numerical calculation, discretization of the function, established the interface by using the method of stratified modulus gradient of the interface Based on the axisymmetric RVE model, it is found that the prediction of elastic modulus of In-situ Aluminum Matrix Composites with gradient changes of interfacial modulus is smaller than that of corresponding composite interfaces.

【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 陳東;樂永康;白亮;馬乃恒;李險峰;王浩偉;;原位TiB_2/7055鋁基復(fù)合材料的力學(xué)性能與阻尼性能[J];功能材料;2006年10期

2 朱和國,王恒志,熊黨生,吳申慶;用XD法合成的鋁基復(fù)合材料的組織與力學(xué)性能[J];金屬學(xué)報;2005年08期

，

本文編號：1382410