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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | Table of Contents <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | Abstract <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Abbreviations and Acronyms <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 2 TEST PROGRAM Figures Figure 2-1 \u2013 Typical Test Specimen Design. See Table 2-1 for Dimensions. Drawing Not to Scale. Tables Table 2-1 \u2013 Summary of Test Specimens and Burst Pressure <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | Table 2-2 – Summary of Measured Material Properties in Hoop Direction <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Figure 2-2 \u2013 Experimental Arrangement for Burst Tests. Table 2-3 \u2013 Measured Wall Thickness Before Burst Test <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Figure 2-3 \u2013 Labeled and Shifted Results for Pressure vs. Time for Tests 1 – 9 <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figure 2-4 \u2013 Pressure vs. Time History for Tests 1, 2, and 3 <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Figure 2-5 \u2013 Pressure vs Time History for Tests 4, 5, and 6 <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Figure 2-6 \u2013 Pressure vs. Time History for Tests 7, 8, and 9 <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Figure 2-7 \u2013 Pressure vs. Time History for Tests 10, 11, and 12 <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 3 EXPERIMENTAL RESULTS Figure 3-1 \u2013 Carbon Steel Samples Prior to Burst Testing Showing As-Built Thickness Measurements. Figure 3-2 \u2013 Stainless Steel Samples Prior to Burst Testing Undergoing Thickness Measurements. <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Figure 3-3 \u2013 12\u201d Welded Stainless Steel Specimen (Left) Undergoing Pressurization With 10\u201d Seamless Stainless Samples (Right) Ready for Testing. Figure 3-4 \u2013 10\u201d Carbon Steel Specimen at Moment of Rupture. <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Figure 3-5 \u2013 Carbon Steel Specimens Captured at the Moment of Rupture (CS1W bottom and CS3W top). Figure 3-6 \u2013 10\u201d Carbon Steel and 12\u201d Stainless Steel Samples after Rupture. <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Figure 3-7 \u2013 Specimen #10 (SS1W) After Rupture Figure 3-8 \u2013 Specimen #10 (SS1W) After Rupture. <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure 3-9 – Stainless Steel Specimens After Rupture <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Table 3-1 \u2013 Detailed Rupture Pressure Results <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 4 DISCUSSION OF RESULTS Table 4-1 \u2013 Comparison of Calculated and Actual Burst Pressure <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 5 CONCLUSIONS <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | References <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Appendix I <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Appendix II <\/td>\n<\/tr>\n | ||||||
| 71<\/td>\n | Appendix III <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" ASME STP-PT-097-2023 Stress Intensification Factor, K-Factor, and Sustained Stress Index Development Phase II<\/b><\/p>\n |