本文選題：瀝青混合料 + 蠕變試驗��； 參考：《遼寧工程技術(shù)大學》2015年碩士論文

【摘要】：瀝青混合料是由瀝青砂漿、粗集料和空隙構(gòu)成的復合材料,近年來隨著科學技術(shù)的不斷提高,對瀝青混合料的研究也在不斷地深入,從宏觀研究逐步走向微觀細觀。然而瀝青混合料是一種非均質(zhì)材料,而且當前對瀝青混合料的研究大部分都是在宏觀層面,因此要想對其有深入的研究,必須將外部宏觀力學性質(zhì)與內(nèi)部細觀力學性質(zhì)充分結(jié)合,并進行三維重構(gòu)及力學模擬試驗研究,進而使對瀝青混合料的研究更貼近真實。本文首先采用萬能試驗機結(jié)合自編程序,對AC-10、AC-13、AC-16三種不同級配的瀝青混合料試件在常溫下進行單軸靜態(tài)蠕變試驗,試驗結(jié)果表明,對同一級配的瀝青混合料,所施加的荷載應力越大,瀝青混合料變形就較大。對瀝青砂漿試件進行了單軸靜態(tài)蠕變試驗,得到瀝青砂漿蠕變曲線變化趨勢與瀝青混合料蠕變曲線變化趨勢大致相同,并通過試驗數(shù)據(jù)得到有限元模擬所需要的參數(shù)。此外,本文還采用TAW-2000巖石三軸儀對粗集料巖石進行單軸壓縮試驗,通過計算得到粗集料的彈性模量和泊松比。其次,本文將CT掃描技術(shù)和圖像處理技術(shù)相結(jié)合,對瀝青混合料的CT掃描試樣,得到瀝青混合料的不同層圖像的內(nèi)在信息,然后應用Matlab圖像處理軟件對掃描圖像進行圖像增強、圖像分割和圖像的三值化等處理。結(jié)果表明,通過圖像增強和圖像分割后,使圖像變得清晰、平滑,而通過雙峰法實現(xiàn)三值化后,能將瀝青混合料的三部分組成清晰的分開,為三維重構(gòu)的研究奠定基礎(chǔ)。最后,通過醫(yī)學軟件實現(xiàn)了瀝青混合料試件的三維可視化,并實現(xiàn)了瀝青混合料的三部分組成的分離以及網(wǎng)格的劃分和優(yōu)化,而后將模型導入有限元軟件Ansys中,通過Burgers擬合得到所需的不同材料參數(shù)并轉(zhuǎn)換為Ansys軟件可以識別的Prony級數(shù),對瀝青混合料試件進行三維有限元數(shù)值模擬研究,并將模擬結(jié)果與室內(nèi)蠕變試驗結(jié)果進行對比分析,驗證了模擬的可行性和準確性,為以后進行虛擬力學試驗模擬研究提供了新思路,同時也為工程實際的研究提供了有利的依據(jù)。
[Abstract]:Asphalt mixture is a composite composed of asphalt mortar, coarse aggregate and void. In recent years, with the development of science and technology, the research of asphalt mixture is also going deep, from macroscopic research to microscopic research. However, asphalt mixture is a kind of heterogeneous material, and most of the current research on asphalt mixture is at the macro level. It is necessary to combine the external macroscopic mechanical properties with the internal meso-mechanical properties, and carry out three-dimensional reconstruction and mechanical simulation experiments to make the study of asphalt mixture more realistic. In this paper, the uniaxial static creep tests of three kinds of bituminous mixture specimens with different grades AC-10 and AC-13 AC-16 are carried out at room temperature by using universal testing machine and self-programmed program. The results show that the same grade asphalt mixture is used for the same grade asphalt mixture. The greater the load stress, the greater the deformation of asphalt mixture. The uniaxial static creep test of asphalt mortar specimens was carried out, and the creep curve of asphalt mortar was obtained. The change trend of creep curve of asphalt mortar was approximately the same as that of asphalt mixture, and the parameters needed for finite element simulation were obtained from the test data. In addition, the uniaxial compression test of coarse aggregate rock is carried out by TAW-2000 rock triaxial apparatus, and the elastic modulus and Poisson's ratio of coarse aggregate are calculated. Secondly, the CT scanning technology and image processing technology are combined to obtain the internal information of different layers images of asphalt mixture, and then the image enhancement of the scanning image is carried out by using Matlab image processing software. Image segmentation and ternary image processing. The results show that after image enhancement and image segmentation, the image becomes clear and smooth, and the three parts of the asphalt mixture can be clearly separated by using the bimodal method, which lays the foundation for the research of 3D reconstruction. Finally, the 3D visualization of asphalt mixture specimen is realized by medical software, and the separation of three parts of asphalt mixture and the division and optimization of mesh are realized. Then the model is introduced into the finite element software Ansys. Different material parameters are obtained by Burgers fitting and converted into Prony series which can be recognized by Ansys software. The three-dimensional finite element numerical simulation of asphalt mixture specimen is carried out, and the simulation results are compared with the results of indoor creep test. The feasibility and accuracy of the simulation are verified, which provides a new idea for the simulation research of the virtual mechanical test in the future, and also provides a favorable basis for the practical engineering research.
【學位授予單位】：遼寧工程技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U414

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本文編號：2086934