In this work, the applicability of three different methods, denoted as the direct method, the indirect method, and the simple empirical method based on uniaxial creep damage tolerance parameter, , for the determination of multiaxial stress rupture criterion (MSRC) is assessed. The assessment involves four commonly-used MSRCs, the Sdobyrev and Hayhurst-Leckie (denoted as SHL), the Cane, the Nix and the Huddleston MSRCs. To this end, creep tests on both uniaxial and circumferentially-notched tension (CNT) specimens of 316H stainless steel are carried out at three net-section stress levels, that is, 300 MPa, 320 MPa and 340 MPa, and at 600 °C. The results show that all the three methods are suitable for the determination of MSRC for the steel examined. Of these, the direct method data-based simple empirical equation is attractive as it takes good advantage of uniaxial creep data in terms of reflecting the operative creep failure mechanism, and therefore may serve as an alternative for the determination of the SHL MSRC, particularly when multiaxial test data is not available. Moreover, the determined SHL, Cane and Huddleston MSRCs are found to be equally effective in the creep life prediction of both uniaxial and CNT specimens, while the effectiveness of the Nix MSRC in life prediction depends on position for stress output and material. In addition, factors influencing the determination of MSRC for stainless steels are discussed in terms of experimental data available in the literature.

中文翻译：

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316H不锈钢600℃多轴蠕变应力断裂准则的测定

在这项工作中，评估了三种不同方法（称为直接法、间接法和基于单轴蠕变损伤容限参数 的简单经验法）在确定多轴应力断裂准则（MSRC）方面的适用性。评估涉及四种常用的 MSRC：Sdobyrev 和 Hayhurst-Leckie（记为 SHL）、Cane、Nix 和 Huddleston MSRC。为此，在 300 MPa、320 MPa 和 340 MPa 三个净截面应力水平和 600 ℃ 条件下对 316H 不锈钢单轴和环向切口拉伸 (CNT) 试样进行蠕变试验。 。结果表明，三种方法均适用于受检钢MSRC的测定。其中，基于数据的简单经验方程的直接法很有吸引力，因为它在反映有效蠕变失效机制方面充分利用了单轴蠕变数据，因此可以作为确定 SHL MSRC 的替代方法，特别是当多轴测试数据不可用。此外，发现所确定的 SHL、Cane 和 Huddleston MSRC 在单轴和 CNT 样本的蠕变寿命预测中同样有效，而 Nix MSRC 在寿命预测中的有效性取决于应力输出和材料的位置。此外，还根据文献中的实验数据讨论了影响不锈钢MSRC测定的因素。