【摘要】：混凝土作為最常用的工程材料之一，研究其動(dòng)態(tài)壓縮力學(xué)性能，對(duì)于基礎(chǔ)建設(shè)和結(jié)構(gòu)防護(hù)都有著重要的現(xiàn)實(shí)意義，當(dāng)前對(duì)混凝土材料在較高應(yīng)變率下的力學(xué)特性的研究還較少。本文簡(jiǎn)要回顧混凝土材料動(dòng)態(tài)壓縮力學(xué)性能的研究進(jìn)展,并對(duì)動(dòng)態(tài)增強(qiáng)因子（DIF）經(jīng)驗(yàn)公式存在的問題進(jìn)行論述。指出，由于對(duì)加載方式影響試件受力狀態(tài)的認(rèn)識(shí)不足，前人對(duì)DIF的研究只局限于試件處于一維應(yīng)力狀態(tài)，并未考慮其多軸應(yīng)力狀態(tài)狀態(tài)下的情況，應(yīng)將受力狀態(tài)對(duì)材料DIF的影響計(jì)入綜合考量。使用LS-Dyna中72號(hào)模型（mat concrete damage rel3，又叫KC模型）對(duì)霍普金森桿（SHPB）壓縮試驗(yàn)進(jìn)行數(shù)值模擬，得到SHPB試件中的應(yīng)力與應(yīng)變狀態(tài)。采用該混凝土模型分別對(duì)考慮摩擦和不考慮摩擦的不同長(zhǎng)徑比和不同直徑的SHPB試件進(jìn)行了數(shù)值模擬。具體工作如下： （1）選用KC模型，，設(shè)計(jì)不同長(zhǎng)徑比和不同直徑的試件。通過改變?cè)嚰c壓桿接觸界面的摩擦系數(shù)，分析試件的受力狀態(tài)。結(jié)果表明界面摩擦系數(shù)以及混凝土試件長(zhǎng)徑比和直徑對(duì)其在高應(yīng)變率下的受力狀態(tài)有較大的影響。 （2）對(duì)KC模型中抗壓縮破壞系數(shù)b1、拉伸破壞系數(shù)b2、三軸拉伸破壞系數(shù)b3的影響進(jìn)行了參數(shù)分析，以期調(diào)整得到合適的參數(shù)值，為以后的實(shí)驗(yàn)研究提供參考。結(jié)果表明參數(shù)b1對(duì)應(yīng)變率以及應(yīng)力應(yīng)變關(guān)系影響很大，而其他兩個(gè)參數(shù)對(duì)應(yīng)變率以及應(yīng)力應(yīng)變關(guān)系基本沒有影響。 結(jié)論對(duì)脆性材料SHPB試件的設(shè)計(jì)及SHPB實(shí)驗(yàn)結(jié)果的解釋有一定的指導(dǎo)意義。
[Abstract]:As one of the most commonly used engineering materials, the study of dynamic compression mechanical properties of concrete is of great practical significance for infrastructure construction and structural protection. At present, there is little research on the mechanical properties of concrete materials under high strain rate. In this paper, the research progress of dynamic compression mechanical properties of concrete materials is briefly reviewed, and the problems existing in the empirical formula of dynamic reinforcement factor (DIF) are discussed. It is pointed out that due to the lack of understanding of the influence of loading mode on the stress state of the specimen, the previous research on DIF is limited to the one-dimensional stress state of the specimen, and does not consider the multi-axial stress state, and the influence of the stress state on the material DIF should be taken into account. The (SHPB) compression test of Hopkinson rod is simulated by using 72 model (mat concrete damage rel3, in LS-Dyna, also known as KC model, and the stress and strain states in SHPB specimen are obtained. The concrete model is used to simulate SHPB specimens with different aspect ratio and different diameter considering friction and not considering friction respectively. The specific work is as follows: (1) KC model is selected to design specimens with different aspect ratio and different diameter. By changing the friction coefficient of the contact interface between the specimen and the compression bar, the stress state of the specimen is analyzed. The results show that the interfacial friction coefficient, the aspect ratio and diameter of concrete specimens have great influence on the stress state of concrete specimens at high strain rate. (2) the effects of compression failure coefficient b1, tensile failure coefficient b2 and triaxial tensile failure coefficient b3 in KC model are analyzed in order to adjust the appropriate parameters and provide reference for future experimental research. The results show that parameter b1 has great influence on strain rate and stress-strain relationship, while the other two parameters have little effect on strain rate and stress-strain relationship. Conclusion it has certain guiding significance for the design of brittle material SHPB specimen and the explanation of SHPB experimental results.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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