基于霍布金森压杆的砂岩动态力学特性数值模拟研究
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摘要
以砂岩为研究对象,采用ANSYS/LS-DYNA软件建立分离式霍布金森压杆数值模型,模拟砂岩在不同应变率及应力波加载次数下的冲击过程。研究结果表明:随着应力波的传递,砂岩表现为三种破坏模式:张应变破坏、沿径向劈裂拉伸破坏、压碎破坏阶段;随着应变率的增大,动态峰值应力和峰值应变也随之增大;应变率一定时,随着应力波加载次数的增加,岩样的入射能、反射能、耗散能都呈现减小的趋势,而总耗能却表现为逐渐增大。
The sandstone was taken as the research object,and ANSYS/LS-DYNA software was used to establish a discrete Hopkinson compression bar numerical model to simulate the impact process of sandstone under different strain rates and stress wave loading times. The results show that with the transfer of stress wave,sandstone shows three failure modes:tensile strain failure,radial splitting tensile failure and crushing failure. With the increase of strain rate,the dynamic peak stress and peak strain also increase. When the strain rate is constant,with the increase of stress wave loading times,the incident energy,reflected energy and dissipated energy of rock samples all show a decreasing trend,while the total dissipated energy gradually increases.
The sandstone was taken as the research object,and ANSYS/LS-DYNA software was used to establish a discrete Hopkinson compression bar numerical model to simulate the impact process of sandstone under different strain rates and stress wave loading times. The results show that with the transfer of stress wave,sandstone shows three failure modes:tensile strain failure,radial splitting tensile failure and crushing failure. With the increase of strain rate,the dynamic peak stress and peak strain also increase. When the strain rate is constant,with the increase of stress wave loading times,the incident energy,reflected energy and dissipated energy of rock samples all show a decreasing trend,while the total dissipated energy gradually increases.
引文
[1]郭世儒.高应变率下煤系砂岩力学性能及能量耗散规律研究[D].北京:中国矿业大学,2017.
[2]袁璞,马芹永.干湿循环条件下煤矿砂岩分离式霍普金森压杆试验研究[J].岩土力学,2013,34(9):2557-2562.
[3]张岩,李庆文,李淼,等.不同应变率下砂岩的动态力学特性研究[J].中国矿业,2015,24(S2):162-166.
[4]鲁义强,张盛,高明忠,等.多次应力波作用下P-CCNBD岩样动态断裂的能量耗散特性研究[J].岩石力学与工程学报,2018,37(5):1106-111.
[5]常玉林,温森,张建伟.基于SHPB的复合岩样动态力学特性数值模拟研究[J].长江科学院院报,2019,36(7):106-111.
[6]赵光明,马文伟,孟祥瑞.动载作用下岩石类材料破坏模式及能量特性[J].岩土力学,2015,36(12):3598-3605+3624.
[7]李晓锋,李海波,刘凯,等.冲击荷载作用下岩石动态力学特性及破裂特征研究[J].岩石力学与工程学报,2017,36(10):2393-2405.
[8]Hakalehto K O. Brittle fracture of rocks under impulse loads[J]. International Journal of Fracture Mechanics,1970,6(3):249-256.
[9]高科.岩石SHPB实验技术数值模拟分析[D].长沙:中南大学,2009.
[10]范超,余克服,孟庆山,等. SHPB在岩石动态力学性能测试中的应用成果综述[J].土工基础,2018,32(5):552-558.
[11]Holmquist T J,Johnson G R. A Computational constitutive model for concrete subjected to large strains,high strain rates and high pressures[A].14th International Symposium on Ballistic[C]. Quebce City,Canada,1993:593-600.
[12]方秦,孔祥振,吴昊,等.岩石Holmquist-Johnson-Cook模型参数的确定方法[J].工程力学,2014,31(3):197-204.
[2]袁璞,马芹永.干湿循环条件下煤矿砂岩分离式霍普金森压杆试验研究[J].岩土力学,2013,34(9):2557-2562.
[3]张岩,李庆文,李淼,等.不同应变率下砂岩的动态力学特性研究[J].中国矿业,2015,24(S2):162-166.
[4]鲁义强,张盛,高明忠,等.多次应力波作用下P-CCNBD岩样动态断裂的能量耗散特性研究[J].岩石力学与工程学报,2018,37(5):1106-111.
[5]常玉林,温森,张建伟.基于SHPB的复合岩样动态力学特性数值模拟研究[J].长江科学院院报,2019,36(7):106-111.
[6]赵光明,马文伟,孟祥瑞.动载作用下岩石类材料破坏模式及能量特性[J].岩土力学,2015,36(12):3598-3605+3624.
[7]李晓锋,李海波,刘凯,等.冲击荷载作用下岩石动态力学特性及破裂特征研究[J].岩石力学与工程学报,2017,36(10):2393-2405.
[8]Hakalehto K O. Brittle fracture of rocks under impulse loads[J]. International Journal of Fracture Mechanics,1970,6(3):249-256.
[9]高科.岩石SHPB实验技术数值模拟分析[D].长沙:中南大学,2009.
[10]范超,余克服,孟庆山,等. SHPB在岩石动态力学性能测试中的应用成果综述[J].土工基础,2018,32(5):552-558.
[11]Holmquist T J,Johnson G R. A Computational constitutive model for concrete subjected to large strains,high strain rates and high pressures[A].14th International Symposium on Ballistic[C]. Quebce City,Canada,1993:593-600.
[12]方秦,孔祥振,吴昊,等.岩石Holmquist-Johnson-Cook模型参数的确定方法[J].工程力学,2014,31(3):197-204.
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