石油矿场机械
石油礦場機械
석유광장궤계
Oil Field Equipment
2015年
11期
12-17
,共6页
锥形 PDC 齿%破岩机理%数值仿真%切削角
錐形 PDC 齒%破巖機理%數值倣真%切削角
추형 PDC 치%파암궤리%수치방진%절삭각
conical PDC cutter%rock-breaking mechanism%numerical simulation%cutting ang le
锥形 PDC 齿作为一种新型破岩方式，其相关理论在国内研究还处于起步阶段。采用 Druck-er-Prager 准则，以等效塑性应变作为破坏准则，建立了基于 ABAQUS 的锥形 PDC 齿切削岩石有限元分析模型。通过数值仿真、理论分析阐述了锥形 PDC 齿切向上以剪切破坏为主、侧向方向以挤压拉伸断裂破坏为主的破岩机理，以及“相邻”效应，并且数值仿真分析了切削深度、切削角度对锥形 PDC 齿破岩效率的影响规律，优选出最优切削角度20°。研究结果对锥形 PDC 齿为基础的新型 PDC 钻头的设计提供了依据。
錐形 PDC 齒作為一種新型破巖方式，其相關理論在國內研究還處于起步階段。採用 Druck-er-Prager 準則，以等效塑性應變作為破壞準則，建立瞭基于 ABAQUS 的錐形 PDC 齒切削巖石有限元分析模型。通過數值倣真、理論分析闡述瞭錐形 PDC 齒切嚮上以剪切破壞為主、側嚮方嚮以擠壓拉伸斷裂破壞為主的破巖機理，以及“相鄰”效應，併且數值倣真分析瞭切削深度、切削角度對錐形 PDC 齒破巖效率的影響規律，優選齣最優切削角度20°。研究結果對錐形 PDC 齒為基礎的新型 PDC 鑽頭的設計提供瞭依據。
추형 PDC 치작위일충신형파암방식，기상관이론재국내연구환처우기보계단。채용 Druck-er-Prager 준칙，이등효소성응변작위파배준칙，건립료기우 ABAQUS 적추형 PDC 치절삭암석유한원분석모형。통과수치방진、이론분석천술료추형 PDC 치절향상이전절파배위주、측향방향이제압랍신단렬파배위주적파암궤리，이급“상린”효응，병차수치방진분석료절삭심도、절삭각도대추형 PDC 치파암효솔적영향규률，우선출최우절삭각도20°。연구결과대추형 PDC 치위기출적신형 PDC 찬두적설계제공료의거。
Conical PDC cutter as a new break the rock,the theory is still in initial phase in China. By choosing Drucker-Prager criterion as the rock constitutive model,equivalent plastic strain as the failure criterion,the FEA model of rock-cutting by conical PDC cutter was established,which was based on ABAQUS.Through numerical simulation and theoretical analysis,the rock-breaking mechanism of conical PDC cutter was elaborated:shear failure in tangential and tensile fracture failure in lateral direction,“adjacent”effect was also elaborated.The influence laws between rock-breaking efficiency and cutting depth as well as cutting angle were simulated,and the optimal cut-ting angle 20°was selected.The rock breaking model of the conical PDC cutter is plow-breaking of the PDC bit.
