改进的圆形紧凑拉伸法研究混凝土双G断裂参数
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摘要
双G断裂模型是双K断裂模型的延伸和补充。采用改进的圆形紧凑拉伸法进行试验,首先验证这种新型断裂力学试验方法能否获得稳定的双G断裂参数,并将公式K=(EG)~(1/2)得到的双K断裂韧度与直接计算得到的结果相比较,进一步验证双G断裂模型和双K断裂模型在描述断裂性能方面的等效性。同时研究了两种断裂模型参数的尺寸效应。试验试件直径从150 mm到300 mm变化,共计分为4组。试验结果表明,采用改进的圆形紧凑拉伸法测得双G参数的数值较为稳定,离散性较小。双G断裂模型和双K断裂模型在描述断裂性能方面具有很高的等效性。在本文的尺寸范围内,当试件直径大于200 mm时,起裂断裂参数KiniIc和GiniIc没有明显的尺寸效应,失稳断裂参数K_(Ic)~(un)和G_(Ic)~(un)随着试件尺寸的增大而增大,但增长幅度不大。
The double-G fracture model is an extension and supplement of the double-K fracture model.The modified round compact tension method were used to verify whether the new fracture mechanics testmethod can obtain stable double-G fracture parameters. The double-K fracture toughness calculated by the formula K = EG was compared with the direct calculation results, in order to further verify the equiva-lence between the double-G fracture model and the double-K fracture model in describing fracture perfor-mance. At the same time,the size effect of two fracture models was studied. The diameters of the 16 testspecimens varied from 150 mm to 300 mm,which were divided into 4 groups. The experimental results showthat the value of the double-G parameters measured by the modified round compact tension method ismore stable and the dispersion is smaller. The double-G fracture model and the double-K fracture modelhave high equivalence in describing the fracture properties. When the specimen diameter is greater than200 mm,initial fracture toughness KiniIcand initial energy release rate GiniIchave no obvious size effect,unstable fracture toughness KunIcand unstable energy release rate GunIcincreases with the specimen size increasing,but the growth is small.
The double-G fracture model is an extension and supplement of the double-K fracture model.The modified round compact tension method were used to verify whether the new fracture mechanics testmethod can obtain stable double-G fracture parameters. The double-K fracture toughness calculated by the formula K = EG was compared with the direct calculation results, in order to further verify the equiva-lence between the double-G fracture model and the double-K fracture model in describing fracture perfor-mance. At the same time,the size effect of two fracture models was studied. The diameters of the 16 testspecimens varied from 150 mm to 300 mm,which were divided into 4 groups. The experimental results showthat the value of the double-G parameters measured by the modified round compact tension method ismore stable and the dispersion is smaller. The double-G fracture model and the double-K fracture modelhave high equivalence in describing the fracture properties. When the specimen diameter is greater than200 mm,initial fracture toughness KiniIcand initial energy release rate GiniIchave no obvious size effect,unstable fracture toughness KunIcand unstable energy release rate GunIcincreases with the specimen size increasing,but the growth is small.
引文
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[15]吴智敏,徐世烺,王金来,等.三点弯曲梁法研究砼双K断裂参数及其尺寸效应[J].水力发电学报,2000(4):16-24.
[16]ZHANG X F,XU S L.A comparative study on five approaches to evaluate double-K fracture toughness parameters of concrete and size effect analysis[J].Engineering Fracture Mechanics,2011,78:15-38.
[17]ZHAO G,JIAO H,XU S L.Study on fracture behavior with wedge splitting test method[C]//Fracture Processes in Concrete Rock Andceramics.London:E&F.N.Spon.,1991.
[18]BRUHWILER E,WITTMANN F H.The wedge splitting test,a method of performing stable fracture tests[J].Engineering Fracture Mechanics,1990,35:17-26.
[19]RUIZ G,ORTEGA P J,YU RC,et al.Effect of size and cohesive assumptions on the double-K fracture parameters of concrete[J].Engineering Fracture Mechanics,2016,166:198-217.
[20]CUI X,ZHANG J,HOU F,et al.Experimental study of the effect of RCC specimen size and crack depth ratio on double-K fracture parameters[J].Journal of Testing&Evaluation,2015,43(2):336-343.
[2]吴瑶,徐世烺,吴建营,等.双K断裂准则在丹江口大坝安全性评定中的应用[J].水利学报,2015,46(3):366-372.
[3]XU S L,REINHARDT H W.Determination of double-K criterion for crack propagation in quasi-brittle fracture,Part I:Experimental investigation of crack propagation[J].International Journal of Fracture,1999,98(2):111-149.
[4]XU S L,REINHARDT H W.Determination of double-K criterion for crack propagation in quasi-brittle fracture,Part II:Analytical evaluating and practical measuring methods for three-point bending notched beams[J].International Journal of Fracture,1999,98(2):151-177.
[5]XU S L,REINHARDT H W.Determination of double-K criterion for crack propagation in quasi-brittle fracture,Part III:Compact tension specimens and wedge splitting specimens[J].International Journal of Fracture,1999,98(2):179-193.
[6]赵艳华,徐世烺,吴智敏.混凝土结构裂缝扩展的双G准则[J].土木工程学报,2004,37(10):13-18.
[7]KIM M,BUTTLAR W G,BAEK J,et al.Field and laboratory evaluation of fracture resistance of illinois hot-mix asphalt overlay mixtures[J].Transportation Research Record Journal of the Transportation Research Board,2009,2127(2127):146-154.
[8]ZOFKA A,BRAHAM A.Comparison of low-temperature field performance and laboratory testing of 10 Test sections in the Midwestern United States[J].Transportation Research Record Journal of the Transportation Research Board,2009,2127(2127):107-114.
[9]WAGNONER M P,BUTTLAR W G,PAULINO G H.Disk-shaped compact tension test for asphalt concrete fracture[J].Experimental Mechanics,2005,45(3):270-277.
[10]CIFUENTES H,LOZANO M,HOLUSOVA T,et al.Modified disk-shaped compact tension test for measuring concrete fracture properties[J].International Journal of Concrete Structures and Materials,2017,11(2):215-228.
[11]徐世烺.混凝土断裂力学[M].北京:科学出版社,2011.
[12]FISHER D M,BUZZARD R J.Comparison tests and experimental compliance calibration of the proposed standard round compact plane strain fracture toughness specimen[R].NASA,1979.
[13]XU S L,ZHANG X F.Determination of fracture parameters for crack propagation in concrete using an energy approach[J].Engineering Fracture Mechanics,2008,75:4293-4308.
[14]徐世烺,卜丹,张秀芳.不同尺寸楔入式紧凑拉伸试件双K断裂参数的试验测定[J].土木工程学报,2008,42(2):70-76.
[15]吴智敏,徐世烺,王金来,等.三点弯曲梁法研究砼双K断裂参数及其尺寸效应[J].水力发电学报,2000(4):16-24.
[16]ZHANG X F,XU S L.A comparative study on five approaches to evaluate double-K fracture toughness parameters of concrete and size effect analysis[J].Engineering Fracture Mechanics,2011,78:15-38.
[17]ZHAO G,JIAO H,XU S L.Study on fracture behavior with wedge splitting test method[C]//Fracture Processes in Concrete Rock Andceramics.London:E&F.N.Spon.,1991.
[18]BRUHWILER E,WITTMANN F H.The wedge splitting test,a method of performing stable fracture tests[J].Engineering Fracture Mechanics,1990,35:17-26.
[19]RUIZ G,ORTEGA P J,YU RC,et al.Effect of size and cohesive assumptions on the double-K fracture parameters of concrete[J].Engineering Fracture Mechanics,2016,166:198-217.
[20]CUI X,ZHANG J,HOU F,et al.Experimental study of the effect of RCC specimen size and crack depth ratio on double-K fracture parameters[J].Journal of Testing&Evaluation,2015,43(2):336-343.
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