【摘要】：在對素混凝土的沖擊動力學(xué)測試中，通常會存在慣性效應(yīng)和摩擦效應(yīng)，這些效應(yīng)進(jìn)入了最后的測試結(jié)果，為試驗(yàn)帶來了不必要的誤差甚至?xí)䦟?dǎo)致錯誤。目前已經(jīng)有許多研究描述了這方面的研究成果，然而，對于素混凝土材料慣性效應(yīng)和摩擦效應(yīng)導(dǎo)致素混凝土在動態(tài)荷載作用下的動態(tài)強(qiáng)度改變的機(jī)理方面的學(xué)術(shù)爭論至今仍無法統(tǒng)一。 因此，本文以C40素混凝土為基礎(chǔ)，對不同尺寸的素混凝土試件進(jìn)行準(zhǔn)靜態(tài)壓縮試驗(yàn)和動態(tài)壓縮試驗(yàn)，同時還對素混凝土試件的動態(tài)壓縮試驗(yàn)進(jìn)行了數(shù)值模擬，分析了慣性效應(yīng)和摩擦效應(yīng)對素混凝土動態(tài)強(qiáng)度、素混凝土動態(tài)增強(qiáng)因子（DIF）的影響，具體包括以下工作： 1.對尺寸為Φ22mm×11mm、Φ32mm×16mm、Φ40mm×20mm的素混凝土試件進(jìn)行了準(zhǔn)靜態(tài)壓縮試驗(yàn)，分析了慣性效應(yīng)對素混凝土試件準(zhǔn)靜態(tài)壓縮試驗(yàn)結(jié)果的影響。對尺寸為Φ32mm×10mm、Φ32mm×20mm、Φ32mm×30mm的素混凝土試件進(jìn)行了靜摩擦系數(shù)測定和準(zhǔn)靜態(tài)壓縮試驗(yàn)，分析了摩擦效應(yīng)對準(zhǔn)靜態(tài)壓縮試驗(yàn)結(jié)果的影響。通過對試驗(yàn)數(shù)據(jù)的分析，得到了素混凝土試件的荷載-時間關(guān)系。 2.對素混凝土試件在SHPB動態(tài)壓縮試驗(yàn)中的慣性效應(yīng)和摩擦效應(yīng)進(jìn)行了理論分析。 3.使用SHPB試驗(yàn)裝置對上述六種尺寸的素混凝土試件進(jìn)行了動態(tài)壓縮試驗(yàn)，并通過對試驗(yàn)數(shù)據(jù)的分析處理得到了SHPB試驗(yàn)過程中的應(yīng)力波的變化圖，素混凝土試件的應(yīng)變率-時間變化曲線、應(yīng)力-應(yīng)變關(guān)系、峰值應(yīng)力-應(yīng)變率關(guān)系等等。分析了慣性效應(yīng)和摩擦效應(yīng)對素混凝土試件動態(tài)強(qiáng)度的影響。 4.提出了素混凝土的動態(tài)增強(qiáng)因子（DIF）與應(yīng)變率之間的關(guān)系表達(dá)式，，同時還分析了慣性效應(yīng)和摩擦效應(yīng)對素混凝土動態(tài)增強(qiáng)因子（DIF）的定量影響。 5.使用HJC本構(gòu)模型通過有限元軟件ANSYS/LS-DYNA對素混凝土試件的SHPB動態(tài)壓縮試驗(yàn)進(jìn)行了數(shù)值模擬，并將數(shù)值模擬結(jié)果和試驗(yàn)結(jié)果進(jìn)行了對比分析。 最后，通過對本論文進(jìn)行總結(jié)，指出了一些本課題需要改善和進(jìn)一步研究的內(nèi)容。
[Abstract]:In the test of impact dynamics of plain concrete, inertia effect and friction effect usually exist. These effects come into the final test result, and bring unnecessary error to the test and even lead to error. Many studies have described the results, however, The academic debate on the mechanism of dynamic strength change of plain concrete under dynamic load caused by inertia effect and friction effect of plain concrete is still not uniform. Therefore, based on C40 plain concrete, quasi static compression test and dynamic compression test are carried out for different size plain concrete specimens. At the same time, the dynamic compression tests of plain concrete specimens are numerically simulated. The influence of inertia effect and friction effect on the dynamic strength of plain concrete and the dynamic enhancement factor of plain concrete (DIF) are analyzed, including the following work: 1. The quasi-static compression tests of plain concrete specimens with size 桅 22mm 脳 11mm, 桅 32mm 脳 16mm and 桅 40mm 脳 20mm were carried out. The influence of inertia effect on the results of quasi-static compression tests of plain concrete specimens was analyzed. The static friction coefficient and quasi-static compression test of plain concrete specimens of 桅 32mm 脳 10mm, 桅 32mm 脳 20mm and 桅 32mm 脳 30mm were measured. The effect of friction effect on the results of static compression tests was analyzed. By analyzing the test data, the load-time relationship of plain concrete specimens is obtained. 2. 2. The inertia effect and friction effect of plain concrete specimen in SHPB dynamic compression test are analyzed theoretically. 3. The dynamic compression tests of the six kinds of plain concrete specimens mentioned above were carried out by using the SHPB test device, and the change diagram of the stress waves during the SHPB test was obtained by analyzing and processing the test data. The strain rate-time curve, stress-strain relation, peak stress-strain rate relationship of plain concrete specimens are discussed. The influence of inertia effect and friction effect on the dynamic strength of plain concrete specimen is analyzed. 4. The relationship between dynamic enhancement factor (DIF) and strain rate of plain concrete is presented. The quantitative effects of inertia effect and friction effect on (DIF) of plain concrete dynamic enhancement factor are also analyzed. The HJC constitutive model was used to simulate the SHPB dynamic compression test of plain concrete specimens by the finite element software ANSYS/LS-DYNA, and the numerical simulation results were compared with the experimental results. Finally, through the summary of this paper, some contents that need to be improved and further studied are pointed out.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陳建林;李旭東;劉凱欣;;素混凝土本構(gòu)模型參數(shù)的實(shí)驗(yàn)研究[J];北京大學(xué)學(xué)報(自然科學(xué)版);2008年05期

2 韓麗;高世橋;李明輝;劉海鵬;;彈丸垂直貫穿混凝土靶的數(shù)值研究[J];北京理工大學(xué)學(xué)報;2006年11期

3 馬愛娥;黃風(fēng)雷;李金柱;武海軍;;鋼筋混凝土抗貫穿數(shù)值模擬[J];北京理工大學(xué)學(xué)報;2007年02期

4 武海軍;黃風(fēng)雷;付躍升;張慶明;馬愛娥;;鋼筋混凝土中爆炸破壞效應(yīng)數(shù)值模擬分析[J];北京理工大學(xué)學(xué)報;2007年03期

5 劉孝敏,胡時勝;應(yīng)力脈沖在變截面SHPB錐桿中的傳播特性[J];爆炸與沖擊;2000年02期

6 盧芳云,W.Chen,D.J.Frew;軟材料的SHPB實(shí)驗(yàn)設(shè)計(jì)[J];爆炸與沖擊;2002年01期

7 張鳳國,李恩征;大應(yīng)變、高應(yīng)變率及高壓強(qiáng)條件下混凝土的計(jì)算模型[J];爆炸與沖擊;2002年03期

8 嚴(yán)少華,李志成,王明洋,尹放林;高強(qiáng)鋼纖維混凝土沖擊壓縮特性試驗(yàn)研究[J];爆炸與沖擊;2002年03期

9 胡時勝,王道榮;沖擊載荷下混凝土材料的動態(tài)本構(gòu)關(guān)系[J];爆炸與沖擊;2002年03期

10 巫緒濤,胡時勝,張芳榮;兩點(diǎn)應(yīng)變測量法在SHPB測量技術(shù)上的運(yùn)用[J];爆炸與沖擊;2003年04期

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