动态冲击下纤维素固井水泥石力学性能及增韧机理研究
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摘要
为研究动载荷下纤维素固井水泥石抗冲击性能及内部纤维素增韧机理,采用杆径50 mm的霍普金森杆(SHPB)对不同纤维素加量的油井水泥石进行动态加载,并利用高速摄影仪记录破裂形貌。通过动载荷下的应力-应变、韧性及总能量吸收图等研究纤维素固井水泥石的力学性能。利于扫描电镜SEM研究纤维素的微观增韧机理及纤维素对水泥基材料的增韧作用。结果表明,动载荷下,纤维素水泥石的强度、韧性及能量吸收能力在加量0. 3%时最高。纤维素水泥石表面裂纹量少且曲折度并不明显,破裂程度较轻。纤维素的增韧机理为拔出机制、裂纹偏转,弯曲机制由于冲击速度太快,基体变硬而被抑制。
In order to study the impact resistance of cellulose cement under dynamic loading and the mechanism of internal cellulose toughening,Hopkinson rod( SHPB) with 50 mm rod diameter was used to dynamically load the cement stone with different amount of cellulose. The fracture morphology was recorded by high-speed photography. The mechanical properties of cellulose cemented cement are studied by means of stress-strain, toughness and total energy absorption diagram under dynamic loading.Scanning electron microscope( SEM) is helpful to study the microtoughening mechanism of cellulose and the effect of cellulose surface on the toughening of cement-based materials. The results show that under dynamic loading,the strength,toughness and energy absorption ability of cellulose cement stone are the highest at 0. 3%. The surface crack of cellulose cement stone is less and the degree of twists is not obvious,and the degree of fracture is light. The toughening mechanism of cellulose is pull-out mechanism,crack deflection and bending mechanism.
In order to study the impact resistance of cellulose cement under dynamic loading and the mechanism of internal cellulose toughening,Hopkinson rod( SHPB) with 50 mm rod diameter was used to dynamically load the cement stone with different amount of cellulose. The fracture morphology was recorded by high-speed photography. The mechanical properties of cellulose cemented cement are studied by means of stress-strain, toughness and total energy absorption diagram under dynamic loading.Scanning electron microscope( SEM) is helpful to study the microtoughening mechanism of cellulose and the effect of cellulose surface on the toughening of cement-based materials. The results show that under dynamic loading,the strength,toughness and energy absorption ability of cellulose cement stone are the highest at 0. 3%. The surface crack of cellulose cement stone is less and the degree of twists is not obvious,and the degree of fracture is light. The toughening mechanism of cellulose is pull-out mechanism,crack deflection and bending mechanism.
引文
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[23]Li Y,Li Y.Experimental study on performance of rubber particle and steel fiber composite toughening concrete[J].Construction&Building Materials,2017,146:267-275.
[2]Zhang H,Shen R,Yuan G,et al.Cement sheath integrity analysis of underground gas storage well based on elastoplastic theory[J].Journal of Petroleum Science&Engineering,2017,159:818-829.
[3]Liu Y,Yan H,Yu X,et al.Negative impacts of borehole pressure change on cement sheath sealing integrity and countermeasures[J].Natural Gas Industry,2014,34(4):95-98.
[4]Cheng X,Mei K,Li Z,et al.Research on the interface structure during unidirectional corrosion for oil-well cement H2S based on computed tomography technology[J].Industrial&Engineering Chemistry Research,2016,55(41):10889-10895.
[5]杨磊,何廷树,盖国胜,等.纤维特性对砂加气混凝土力学性能和微观结构的影响[J].硅酸盐通报,2018,37(6):1813-1817.
[6]张倩茜,张径伟,张必亮.纤维增韧水泥基复合材料抗压强度影响因素研究[J].河南城建学院学报,2011,20(5):1-4.
[7]田露丹,张径伟,董帅,等.PVA纤维增韧水泥基复合材料高温后力学性能研究[J].混凝土,2011(12):31-33.
[8]张博明,李嘉,李煦.混杂纤维复合材料最优纤维混杂比例及其应用研究进展[J].材料工程,2014(7):107-112.
[9]田亮,诸华军,姚晓,等.油田固井用纤维对油井水泥石的增韧性能[J].油气田地面工程,2013(10):39-40.
[10]张倩茜,袁广林,张径伟,等.纤维增韧水泥基复合材料拉伸性能影响因素研究[J].混凝土与水泥制品,2011(11):35-38.
[11]华苏东,姚晓.复合纤维提高油井水泥石韧性的研究[J].钻井液与完井液,2007,24(4):40-42.
[12]李明,邓双,严平,等.纤维/晶须材料对固井水泥石的增韧机理研究[J].西南石油大学学报(自然科学版),2016,38(5):151-156.
[13]杜修力,窦国钦,李亮,等.纤维高强混凝土的动态力学性能试验研究[J].工程力学,2011,28(4):138-144.
[14]王璞,黄真,周岱,等.碳纤维混杂纤维混凝土抗冲击性能研究[J].振动与冲击,2012,31(12):14-18.
[15]李志文.新型混杂纤维增强水泥基复合材料的力学性能[D].大连:大连理工大学,2016.
[16]ISO10426-2,Petroleum and natural gas industries-Cements and materials for well cementing-Part 2:Testing of well cements[S].1998:266-273.
[17]李地元,韩震宇,孙小磊,等.含预制裂隙大理岩SHPB动态力学破坏特性试验研究[J].岩石力学与工程学报,2017,36(12):2872-2883.
[18]杨惠贤,黄炎生,李静.纤维增强水泥基复合材料的动力拉伸性能研究[J].工程力学,2016,33(7):144-150.
[19]吴泽媚.超高性能混凝土中纤维与基体界面粘结性能多尺度研究[D].长沙:湖南大学,2017.
[20]陈猛,李艺,卢哲安,等.混杂纤维混凝土动态压缩性能试验及数值模拟研究[J].混凝土,2015(8):91-94.
[21]Khan M Z N,Hao Y,Hao H,et al.Experimental evaluation of quasi-static and dynamic compressive properties of ambient-cured high-strength plain and fiber reinforced geopolymer composites[J].Construction&Building Materials,2018,166:482-499.
[22]Xiao C,Tan Y,Wang X,et al.Study on interfacial and mechanical improvement of carbon fiber/Epoxy composites by depositing multi-walled carbon nanotubes on fibers[J].Chemical Physics Letters,2018,703:8-16.
[23]Li Y,Li Y.Experimental study on performance of rubber particle and steel fiber composite toughening concrete[J].Construction&Building Materials,2017,146:267-275.
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