第1部分:索引断裂韧度数据:MPC合作试验计划使用预裂纹夏比试样测定结果——材料性能委员会（MPC）开展了一项合作试验计划，目的是开发一组数据，用于评估使用预裂纹夏比试样（PCCV）测定T0；的情况；。本文报告了该项目的结果。共有来自四个国家的九个实验室参与了合作测试项目。每个实验室都按照ASTM标准试验方法E1921的出版版本进行了试验- 97以获得T0值。T0根据在三个试验温度下获得的数据确定，分别为-120℃、-100℃和-75℃。选择这些温度是为了测试E1921的要求。-100°C温度是该尺寸试样的最佳试验温度，而-75°C是边缘试验温度，因为会有许多试验无效。-120°C温度低于最佳试验温度，可能需要进行大量试验才能获得T0，或导致数据集无效。在该程序中使用的焊接金属制成的试样上进行了250多次断裂韧性试验，在每个试验温度下进行了60次或更多的试验。 对这些结果进行了分析，并确定了三个主要试验温度中每一个的温度。已经确定了各个试验温度下试样数量的影响。这些结果与同样适用于试验材料的较大尺寸试样的结果进行了比较。第2部分:断裂韧性数据索引:使用ASTM标准E1921-97和E1921-02进行断裂数据分析1997年，日本KIR委员会对日本压力容器钢进行了大规模断裂韧性测试计划。本程序包含大量裂纹萌生试验数据（KIC）。 在本项目中，对24种压力容器钢的转变温度区断裂韧性进行了评估。试验材料代表SA508、SA533的低、中、高韧性炉次，以及SA302B炉次和两次碳钢炉次的长焊缝金属。在1T致密断裂韧性试样上以及在某些情况下在全厚度试样上获得了静态、动态和止裂韧性结果。本文所述研究的目的是使用ASTM试验方法对该数据库进行分析，以确定过渡区（E1921）铁素体钢的参考温度T0- 97）和拟议的E1921-02。这项研究表明，对于试验温度分布在转变温度区的数据集，拟定的确定T0的程序对于静态和动态断裂韧度结果都适用。该程序也适用于一些止裂断裂韧性结果。一些止裂结果接近或在较低的货架上，程序也不起作用。对这些结果使用了分布式温度程序（包括下架），发现该程序运行良好。 当过渡区有足够的数据时，该程序产生的结果似乎与ASTM提出的程序相同。第3部分:断裂韧性数据索引:使用主曲线法进行断裂韧性数据分析日本KIR委员会对日本压力容器钢进行了大规模断裂韧性测试计划。本文分析的断裂韧度数据是在KIR项目下开发的。该项目结果的先前出版物得出结论，该数据库受现有ASME锅炉和压力容器规范KIR曲线的保守下限限制。 以该数据库为基础的另一种KIR曲线通过规范案例N-610纳入ASME规范。本文的目的是使用主曲线法[ASTM E1921]所指的处理断裂韧性的新技术来分析该数据库。进行这项大数据分析是为了验证主曲线法的适用性。本文介绍了主曲线法在1993年完成的24个现代日本KIR数据集上的应用。结果证实，与目前使用的RTNDT方法相比，参考温度T0是铁素体钢断裂韧性的最佳索引参数。 研究结果也为建立动态断裂韧度数据趋势提供了有价值的来源。

Part 1: Indexing Fracture Toughness Data: Results from the MPC Cooperative Test Program on the Use of Precracked Charpy Specimens for ---DeterminationThe Materials Properties Council (MPC) conducted a cooperative testing program with the objective of developing a set of data to be used in the evaluation of the use of the precracked Charpy specimen (PCCV) for the determination of T0;. This paper reports on the results of this program.A total of nine laboratories from four countries participated in the cooperative testing program. Each of the laboratories conducted experiments in accordance with the published version of ASTM Standard Test Method E1921-97 in order to obtain the T0values. T0was determined from data obtained at three test temperatures, -120°C, -100°C and -75°C. These temperatures were chosen to test the requirements of E1921. The -100°C temperature is the optimum test temperature for this size specimen, while -75°C is a marginal test temperature because there would be a number of tests which would be invalid. The -120°C temperature is below the optimum test temperature and may require a large number of tests to obtain T0, or result in an invalid data set.Over 250 fracture toughness tests were conducted on the specimens fabricated from the weld metal used in this program, with 60 or more tests at each test temperature. These results have been analyzed and the T0temperature determined for each of the three primary test temperatures. The effect of number of specimens at the individual test temperatures has been determined. These results are compared with the T0results for larger size specimens also available for the test material.Part 2: Indexing Fracture Toughness Data: Fracture Data Analysis using ASTM Standards E1921-97 and E1921-02The Japanese KIR Committee conducted a large-scale fracture toughness testing program for Japanese pressure vessel steels in 1997. Included in this program are a large number of crack initiation test data (KIC). In this project, the fracture toughness in the transition temperature region was evaluated on 24 pressure vessel steels. The test materials represented low, medium and high toughness heats of SA508, SA533 and weld metals long with a SA302B heat and two carbon steel heats. Static, dynamic and crack arrest toughness results were obtained on 1T compact fracture toughness specimens and in some cases on full thickness specimens. The objective of this study described in this paper is to analyze this database using ASTM Test Method for Determination of Reference Temperature, T0, for Ferritic Steels in the Transition Range (E1921-97) and the proposed E1921-02.This study showed that the proposed procedures for the determination of T0for data sets in which the test temperatures are distributed over the transition temperature region work well for both static dynamic fracture toughness results. This procedure also worked well for some of the crack arrest fracture toughness results. Some of the crack arrest results were close to or on the lower shelf and the procedure did not work as well. The distributed temperature procedure, which includes the lower shelf, was used for these results and it was found that this procedure worked well. This procedure appears to generate the same result as the procedure being proposed by the ASTM when there is sufficient data in the transition region.Part 3: Indexing Fracture Toughness Data: Fracture Toughness Data Analysis using the Master Curve MethodThe Japanese KIR Committee conducted a large scale fracture toughness testing program for Japanese pressure vessel steels. The fracture toughness data, which has been analyzed in this paper, was developed under the KIR Project. Previous publications of the results from this program concluded that this database is conservatively lower bounded by the existing ASME Boiler and Pressure Vessel Code KIR curve. An alternative KIR curve based on this database was incorporated into ASME Code by Code Case N-610. The objective of this paper is to analyze this database using a new technology in handling fracture toughness, generally referred to by the Master Curve method [ASTM E1921]. This large data analysis was performed to verify the applicability of the Master Curve method. This paper presents an application of the Master Curve method to twenty-four modern Japanese KIR data sets completed in 1993.The results affirm that the reference temperature T0is the superior indexing parameter for fracture toughness of ferritic steels compared to the currently used RTNDT approach. The results also provide a valuable source for establishing the dynamic fracture toughness data trend.