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| 钴基高温合金GH188板材的屈服行为研究 |
| Yield Behavior of Cobalt-based Superalloy GH188 Sheet Metal |
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| DOI：10.3969/j.issn.1674-6457.2023.02.017 |
| 中文关键词: 高温合金 GH188 十字形试件 屈服准则 屈服轨迹 |
| 英文关键词: superalloy GH188 cruciform specimen yield criterion yield locus |
| 基金项目: |
| Author Name | Affiliation | | MEN Ming-liang | School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China | | MENG Bao | School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China | | ZHU Yu | Aero Engine Academy of China, Beijing 101304, China | | SHI Pei-jue | AECC Aviation Power Co., Ltd., Xi’an 710021, China | | LIU Hong-mei | AECC Aviation Power Co., Ltd., Xi’an 710021, China |
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| 中文摘要: |
| 目的 研究钴基高温合金GH188板材在不同应力状态下的屈服行为，并确定适用的屈服准则，为工程应用提供科学指导。方法 通过开展不同方向的单向拉伸试验得到基本力学性能参数，以轧制方向为参考方向，利用其真实应力-应变曲线标定Ludwik本构模型参数;根据国际标准设计十字形试件，利用ABAQUS软件对其等双拉加载进行有限元仿真，然后基于设计的试样对GH188高温合金板料进行不同载荷比例下的双向拉伸试验，并获取屈服点;结合以上数据，采用Mises、Hill48、Barlat89和Yld2000-2d 4种屈服准则对屈服轨迹、r值和应力值进行预测。结果 等双拉过程中，十字形试件中心区应力分布均匀且无切应力，表明试样的设计是合理有效的;4种屈服准则对试验屈服轨迹的平均预测误差相差不大，为(2±0.5)%，但整体而言，Hill48-σ的预测误差最大，Hill48-r和Barlat89屈服准则呈现相似的预测能力，误差约为20%，Yld2000-2d屈服准则预测精度最高，综合误差仅有2.41%，远远小于其他3种屈服准则的预测误差。结论 钴基高温合金GH188板材具有明显的各向异性，Yld2000-2d屈服准则可以精确地描述该材料在复杂应力状态下的屈服行为。 |
| 英文摘要: |
| The work aims to study the yield behavior of cobalt-based superalloy GH188 sheet metal under different stress conditions and to determine the applicable yield criterion, so as to provide scientific guidance for engineering applications. The basic mechanical property parameters were obtained by uniaxial tension tests in different directions. With rolling direction as the reference direction, the parameters of Ludwik constitutive model were calibrated with its real stress-strain curve. A cruciform specimen was designed according to the international standard. Finite element simulation of equi-biaxial tension was carried out by ABAQUS. Then the biaxial tensile test of GH188 superalloy sheet metal under different load ratios were carried out based on the designed specimen, and the yield point was obtained. Combined with the above data, the yield locus, r-values and stress values were predicted with different yield criteria including Mises, Hill48, Barlat89 and Yld2000-2d. In the process of biaxial tension, the stress distribution in the center of the cross specimen was uniform and there was no shear stress, which indicated that the design of the specimen was reasonable and effective. The four yield criteria had little difference in the average prediction error of the experimental yield locus, which was (2±0.5)%. However, Hill48-σ had the largest prediction error in global, and Hill48-r and Barlat89 yield criteria showed similar prediction ability with an error of about 20%. The Yld2000-2d yield criterion had the greatest prediction accuracy. Its global error was only 2.41%, which was far less than that of the other three yield criteria. Cobalt-based superalloy GH188 plate has obvious anisotropy, and Yld2000-2d yield criterion can accurately describe the yield behavior of the material under complex stress state |
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