用力矩模型解释摩擦试验加载过程中的非线性变化
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摘要
应用考虑力矩的弹簧-滑块-平面模型,对摩擦试验加载过程中的非线性变化进行了分析。结果表明,当加载过程进行到一定程度时,因力矩的作用而出现的剪应力分布的调整,将造成滑动发生前的力-位移曲线的非线性变化。
The nonlinearity in loading process of frictional tests is discussed by using 3D spring-rider-flat model with moment considered. Due to the moment of driving force,the normal stress on the flat does not distribute uniformly,which induces nonuniform distribution of frictional resistance by assuming friction coefficient is constant. The whole loading process actually consists of two stages. (1) Before the shear stress reaches the resistance,the rider does neither slide nor deform and the force-displacement curve is linear. (2) After the shear stress,because of the moment,reaches the resistance firstly at the end where the driving force acts,the rider deforms before it slides as a whole. The deformation of the rider will lead to redistribution of the shear stress on the flat and the nonlinear curve of force-displacement should be considered. Since no damage happens to the flat,this mechanism can repeatedly produce such nonlinear phenomenon.
The nonlinearity in loading process of frictional tests is discussed by using 3D spring-rider-flat model with moment considered. Due to the moment of driving force,the normal stress on the flat does not distribute uniformly,which induces nonuniform distribution of frictional resistance by assuming friction coefficient is constant. The whole loading process actually consists of two stages. (1) Before the shear stress reaches the resistance,the rider does neither slide nor deform and the force-displacement curve is linear. (2) After the shear stress,because of the moment,reaches the resistance firstly at the end where the driving force acts,the rider deforms before it slides as a whole. The deformation of the rider will lead to redistribution of the shear stress on the flat and the nonlinear curve of force-displacement should be considered. Since no damage happens to the flat,this mechanism can repeatedly produce such nonlinear phenomenon.
引文
1BraceW F,ByerleeJ D.Stick-slip as a mechanism for earthquakes[J].Science,1966,153:990～992
2Byerle eJD.Fricti on ofrocks[J].Pu reandAppliedGeophysics,1978,116(4/5):615～626
3Bow denFP,LebenL .Thena tu reofsli din gan dtheanal ysi sandfriction[J].Proc.Roy.Soc.LondonA,1939,169:371～391
4Ishl inskiAY,Krage lski iIV.Onstic k- slipinfriction[J].Zh.Teken.Fiz.,1944,(14):276～282
5 Byerl eeJD.Them ec hanicsofstick-slip[J].Techonophysics,1970,(9):475～486
6ScholzCH.Th eMechanicsofE arthquakesandFaulting[M].NewYork:CambridgeUniversityPress,1990
7邱泽华,石耀霖,尹健民.摩擦试验加载过程中力矩作用的理论研究[J].岩石力学与工程学报,2001,20(增):1797??800
8LoganJ M.Creep,sta blesliding, andpremonitoryslip[J].Pageoph.,1978,116(4/5):773～789
9芮勇勤,唐春安.岩石剪切破坏过程的RFPA2D数值模拟[J].岩石力学与工程学报,2002,21(3):364～368
2Byerle eJD.Fricti on ofrocks[J].Pu reandAppliedGeophysics,1978,116(4/5):615～626
3Bow denFP,LebenL .Thena tu reofsli din gan dtheanal ysi sandfriction[J].Proc.Roy.Soc.LondonA,1939,169:371～391
4Ishl inskiAY,Krage lski iIV.Onstic k- slipinfriction[J].Zh.Teken.Fiz.,1944,(14):276～282
5 Byerl eeJD.Them ec hanicsofstick-slip[J].Techonophysics,1970,(9):475～486
6ScholzCH.Th eMechanicsofE arthquakesandFaulting[M].NewYork:CambridgeUniversityPress,1990
7邱泽华,石耀霖,尹健民.摩擦试验加载过程中力矩作用的理论研究[J].岩石力学与工程学报,2001,20(增):1797??800
8LoganJ M.Creep,sta blesliding, andpremonitoryslip[J].Pageoph.,1978,116(4/5):773～789
9芮勇勤,唐春安.岩石剪切破坏过程的RFPA2D数值模拟[J].岩石力学与工程学报,2002,21(3):364～368
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