吴泽兵,袁若飞,张文溪,等. 基于多目标遗传算法的PDC复合片交界结构优化设计[J]. 石油钻探技术,2024,52(4):24-33. DOI: 10.11911/syztjs.2024068
引用本文: 吴泽兵,袁若飞,张文溪,等. 基于多目标遗传算法的PDC复合片交界结构优化设计[J]. 石油钻探技术,2024,52(4):24-33. DOI: 10.11911/syztjs.2024068
WU Zebing, YUAN Ruofei, ZHANG Wenxi, et al. Optimization design of interface structure for PDC composite sheets based on multi-objective genetic algorithms [J]. Petroleum Drilling Techniques, 2024, 52(4):24-33. DOI: 10.11911/syztjs.2024068
Citation: WU Zebing, YUAN Ruofei, ZHANG Wenxi, et al. Optimization design of interface structure for PDC composite sheets based on multi-objective genetic algorithms [J]. Petroleum Drilling Techniques, 2024, 52(4):24-33. DOI: 10.11911/syztjs.2024068

基于多目标遗传算法的PDC复合片交界结构优化设计

Optimization Design of Interface Structure for PDC Composite Sheets Based on Multi-Objective Genetic Algorithms

  • 摘要: 为改善PDC复合片界面处的结合能力,提升其整体的抗冲击性和稳定性,提出了一种新型交界结构。采用有限元方法,对比了外界载荷影响下所设计交界结构和常规界面结构复合片的应力分布状态,并基于提出的交界结构,考虑其结构参数的影响,使用最优填充空间法进行采样,结合最小二乘法构建了结构场的二阶响应面近似模型;以交界结构参数为设计变量,结构场等效应力、最大剪应力和最大主应力的最大值为设计目标,采用多目标遗传算法对响应面近似模型进行优化。研究结果表明,相同模拟条件下,相比常规交界结构,新型交界结构的等效应力最大值降低了50.7%,剪应力最大值降低了52.0%,最大主应力最大值降低了22.4%。优化后的PDC复合片在相同条件下,等效应力、最大剪应力及最大主应力均降低14%以上,且具有更好的破岩稳定性,能有效避免应力集中,同时热稳定性增强。研究结果为PDC复合片优化设计提供了理论依据,同时提供了新的优化方法,有助于降低研发成本。

     

    Abstract: A novel interface structure was proposed to enhance the bonding strength at the interface of polycrystalline diamond (PDC) composite sheets, thereby improving their overall impact resistance and stability. The finite element method was employed to compare the stress distribution within composite sheets designed with the proposed interface structure against those with a conventional interface structure under external stress conditions. The study accounted for the influence of the structural parameters of the proposed interface structure, employing an optimal filling space method for sampling. The least square method was used to develop a second-order response surface approximation model of the structural field. Using the interface structure parameters as design variables, the maximum values of equivalent stress, maximum shear stress, and maximum principal stress in the structural field were set as design objectives, and a multi-objective genetic algorithm was then applied to optimize the response surface appro-ximation model. The results demonstrate that, under identical simulation conditions, the proposed interface structure reduces the maximum equivalent stress by 50.7%, the maximum shear stress by 52%, and the maximum principal stress by 22.4% compared to the conventional interface structure. For the optimized PDC composite sheet under the same conditions, equivalent stress, maximum shear stress, and maximum principal stress are all reduced by more than 14%. The optimized PDC composite sheet exhibited improved rock-breaking stability, effectively avoid stress concentration, and enhance thermal stability. The findings provide a theoretical basis for the optimization design of PDC composite sheets and introduce a novel optimization method that can help reduce research and development costs.

     

/

返回文章
返回