加载速率对PDC侧压强度的影响规律研究
首发时间:2009-11-09
摘要:聚晶金刚石复合片(Polycrystalline diamond compacts,简称PDC)是由聚晶金刚石层(PCD)与WC-Co硬质合金基体烧结而成,PCD层界面的结合力与耐久性直接影响到PDC钻头的使用寿命。本文通过模拟实际钻探状态下PDC的切削角(并将在切削角度下PCD层刃缘的抗压强度定义为PDC的侧压强度)来研究不同加载速率对PDC侧压强度的影响,这对更好的选择PDC技术参数,提高PDC钻头使用寿命意义极大。本文利用Instron1342型试验机以及霍布金逊压杆(SHPB)装置,成功实现了从静态到准动态,再到动态的加载过程,得到了不同加载速率下PDC的侧压强度值。实验结果表明,随着加载速率提高,PDC侧压强度提高, 但荷载引起的破坏亦越严重。PDC侧压强度及其不同侧压下的破坏模式都呈现三个明显的阶段特征,即静态、准动态和动态(应变率分别为10-6、10-2、和102量级),其中准动态侧压强度为静态强度的7.3倍,而动态冲击下侧压强度为静态强度的52.4倍。本文所用PD抗侧压强度测试方法与其测试结果,为PDC优化设计及PDC钻头的转速、钻压等技术参数的合理选择提供了实验依据
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Research on the influences of loading speed on the edgewise compressive strength of PDC
Abstract:Polycrystalline diamond compacts(PDC),consisting of a polycrystalline diamond (PCD)-Co layer on a WC-Co substrate, are extensively used in oil drilling. The durability and interface binding force of PCD layer directly influence the service life of PDC bit. The compressive strength of PCD layer on the working condition of PDC bit in drilling is defined as the edgewise compressive strength of PDC. To study the edgewise compressive strength of PDC in different loading speeds is helpful for better choosing the technical parameters and improving the service life of PDC. In this paper,Istron1342 testing machine and Hopkinson pressure bar(SHPB)were used to obtain the strain rate varying from 10-6/s to 102/s,and the edgewise compressive strength of PDC in different loading speeds were successfully obtained. The obtained results show that the edgewise compressive strength and damage of PDC are both increase with the increase of loading speed. There are three staggered features in the range of loading speed,static(10-6),quasi-dynamic(10-2)and dynamic(102)loading. the edgewise compressive strength of PDC in quasi-dynamic and dynamic loading is 7.3 and 52.4 times respectively to that in static loading. This research is helpful for optimum designing of PDC and better choosing the technical parameters of PDC bit in drilling.
Keywords: polycrystalline diamond compacts edgewise compressive strength loading speed failure patterns
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