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ASME STP PT 097 2023

ASME STP PT 097 2023

$75.42

ASME STP-PT-097-2023 Stress Intensification Factor, K-Factor, and Sustained Stress Index Development Phase II

Published By Publication Date Number of Pages
ASME 2023 73
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In support of ASME B31J and B31H standards, physical testing for stress intensification factors (SIFs), flexibility factors (k?Factors), and sustained stress indices (SSIs) can be used to confirm differences between the Markl and Hinnant curves in the low?cycle ranges and finite element predictions of fatigue, stiffness, collapse and burst. Improvement in analytical capability since the 1950s (when Markl developed the basic rules in the B31 piping codes used today) has improved the ability to numerically predict stress states. Unfortunately, not all piping components are well defined geometrically or dimensionally in ASME standard documents. Large D/T (ratio of mean header diameter to header nominal thickness) and d/D (ratio of mean branch diameter to mean header diameter) failures involve nonlinear characteristics that may not be well represented by elastic analyses. In these cases, verification by test is considered essential to verify the predicted values and the method of analysis considered. This publication documents the results of phase II of work undertaken to investigate deficiencies in the existing test data sets identified during the data collection effort from ST-LLC Publication STP-PT-073.

PDF Catalog

PDF Pages PDF Title
4 Table of Contents
5 Foreword
6 Abstract
7 Abbreviations and Acronyms
8 1 INTRODUCTION
9 2 TEST PROGRAM
Figures
Figure 2-1 – Typical Test Specimen Design. See Table 2-1 for Dimensions. Drawing Not to Scale.
Tables
Table 2-1 – Summary of Test Specimens and Burst Pressure
10 Table 2-2 – Summary of Measured Material Properties in Hoop Direction
11 Figure 2-2 – Experimental Arrangement for Burst Tests.
Table 2-3 – Measured Wall Thickness Before Burst Test
12 Figure 2-3 – Labeled and Shifted Results for Pressure vs. Time for Tests 1 – 9
13 Figure 2-4 – Pressure vs. Time History for Tests 1, 2, and 3
14 Figure 2-5 – Pressure vs Time History for Tests 4, 5, and 6
15 Figure 2-6 – Pressure vs. Time History for Tests 7, 8, and 9
16 Figure 2-7 – Pressure vs. Time History for Tests 10, 11, and 12
17 3 EXPERIMENTAL RESULTS
Figure 3-1 – Carbon Steel Samples Prior to Burst Testing Showing As-Built Thickness Measurements.
Figure 3-2 – Stainless Steel Samples Prior to Burst Testing Undergoing Thickness Measurements.
18 Figure 3-3 – 12” Welded Stainless Steel Specimen (Left) Undergoing Pressurization With 10” Seamless Stainless Samples (Right) Ready for Testing.
Figure 3-4 – 10” Carbon Steel Specimen at Moment of Rupture.
19 Figure 3-5 – Carbon Steel Specimens Captured at the Moment of Rupture (CS1W bottom and CS3W top).
Figure 3-6 – 10” Carbon Steel and 12” Stainless Steel Samples after Rupture.
20 Figure 3-7 – Specimen #10 (SS1W) After Rupture
Figure 3-8 – Specimen #10 (SS1W) After Rupture.
21 Figure 3-9 – Stainless Steel Specimens After Rupture
22 Table 3-1 – Detailed Rupture Pressure Results
23 4 DISCUSSION OF RESULTS
Table 4-1 – Comparison of Calculated and Actual Burst Pressure
24 5 CONCLUSIONS
25 References
26 Appendix I
36 Appendix II
71 Appendix III

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ASME STP PT 097 2023
$75.42