1、 STP-NU-041 UPDATE AND IMPROVE SUBSECTION NH ALTERNATIVE SIMPLIFIED CREEP-FATIGUE DESIGN METHODS Prepared by: Tai Asayama Japan Atomic Energy Agency Date of Issuance: March 31, 2011 This report was prepared as an account of work sponsored by the U.S. Department of Energy (DOE) and the ASME Standards
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12、ive Simplified Creep-Fatigue Design Methods STP-NU-041 iii TABLE OF CONTENTS Foreword x Executive Summary xi 1 INTRODUCTION . 1 2 PREREQUISITES FOR EVALUATION 2 2.1 Evaluated Data 2 2.2 Representation of Material Properties . 2 2.3 Prediction Using Time Fraction Rule 2 3 OUTLINE AND PREDICTABILITY O
13、F NEWLY PROPOSED CREEP-FATIGUE EVALUATION METHODS . 7 3.1 Modified Ductility Exhaustion Method . 7 3.2 Strain Range Separation Method . 25 3.3 Approach for Pressure Vessel Applications 42 3.4 Hybrid Method of Time Fraction and Ductility Exhaustion . 58 3.5 Simplified Model Test Approach 72 4 POTENTI
14、AL TO DEPLOYING THE METHODS INVESTIGATED TO ASME-NH 79 4.1 Evaluation of Creep-Fatigue Life Predictability of the Methods Investigated in Short-Term and Long-Term Regions 79 4.2 Evaluation of Basic Potential of the Methods Investigated . 98 4.3 Evaluation of Extendibility of the Methods Investigated
15、 102 4.4 Evaluation of Applicability of the Methods Investigated to ASME-NH 103 4.5 Recommendations . 104 5 CONCLUSIONS . 106 References 107 Appendix 1 - Creep fatigue experiment data of Mod.9Cr-1Mo . 109 Acknowledgments 111 LIST OF TABLES Table 1 - Additive Stress in the Rupture Curve 28 LIST OF FI
16、GURES Figure 1 - Creep Rupture Data at 450-600C 2 Figure 2 - Fatigue Data and Design Fatigue Curves at 550C . 3 Figure 3 - Static and Cyclic Stress-Strain Curves at 550C . 3 Figure 4 - Creep-Fatigue Data at 500C 4 Figure 5 - Creep-Fatigue Data at 550C 4 Figure 6 - Creep-Fatigue Data at 600C 5 Figure
17、 7 - Creep-Fatigue Data at 550C (Stress Controlled Tests) 5 STP-NU-041 Alternative Simplified Creep-Fatigue Design Methods iv Figure 8 - Observed and Predicted Creep-Fatigue Life with Time Fraction Rule 6 Figure 9 - Observed and Predicted Creep-Fatigue Life with Time Fraction Rule 6 Figure 10 - Rela
18、tion between Creep Rupture Time and Fracture Elongation . 10 Figure 11 - Relation between Inelastic Strain Rate and Creep Rupture Elongation at 500C 10 Figure 12 - Relation between Inelastic Strain Rate and Creep Rupture Elongation at 550C 11 Figure 13 - Relation between Inelastic Strain Rate and Cr
19、eep Rupture Elongation at 600C 11 Figure 14 - Relation between Temperature and Tensile Fracture Elongation 12 Figure 15 - Observed and Predicted Creep-Fatigue Life by Ductility Exhaustion Method 12 Figure 16 - Creep-Fatigue Damage Calculated by Ductility Exhaustion Method 13 Figure 17 - Observed and
20、 Predicted Creep-Fatigue Life by Modified Ductility Exhaustion Method 13 Figure 18 - Creep-Fatigue Damage Calculated by Modified Ductility Exhaustion Method 14 Figure 19 - Creep-Fatigue Damage Calculated by Modified Ductility Exhaustion Method 14 Figure 20 - Observed and Predicted Creep-Fatigue Life
21、 by Modified Ductility Exhaustion Method 15 Figure 21 - Creep-Fatigue Damage Calculated by Modified Ductility Exhaustion Method 15 Figure 22 - Creep-Fatigue Damage Calculated by Modified Ductility Exhaustion Method 16 Figure 23 - Observed and Predicted Creep-Fatigue Life with Modified Ductility Exha
22、ustion Method for Stress Controlled Tests 16 Figure 24 - Creep-Fatigue Damage Calculated by Modified Ductility Exhaustion Method for Stress Controlled Tests 17 Figure 25 - Ratio of Predicted Life to Observed Life against Hold Time 17 Figure 26 - Life Reduction Coefficient as a Function of Pure Fatig
23、ue Life when p is 0.1 . 18 Figure 27 - Life Reduction Coefficient as a Function of Pure Fatigue Life when p is 0.5 . 18 Figure 28 - Observed and Predicted Creep-Fatigue Life by Modified Ductility Exhaustion Method for Compressive Hold Tests 19 Figure 29 - Observed and Predicted Creep-Fatigue Life by
24、 Modified Ductility Exhaustion Method for Compressive Hold Tests 19 Figure 30 - Observed and Predicted Creep-Fatigue Life by Modified Ductility Exhaustion Method 20 Figure 31 - Observed and Predicted Creep-Fatigue Life by Modified Ductility Exhaustion Method 20 Figure 32 - Observed and Predicted Ten
25、sile Fracture EORQJDWLRQ/0at 550( 21 Figure 33 - Comparison of Estimation of Creep Damage between MDEM and DEM 21 Figure 34 - Comparison of Estimation of Creep Damage between MDEM and DEM 22 Figure 35 - Comparison of Creep-Fatigue Life between MDEM and TFR at 500C 22 Figure 36 - Comparison of Creep-
26、Fatigue Life between MDEM and TFR at 550C 23 Figure 37 - Comparison of Creep-Fatigue Life between MDEM and TFR at 600C 23 Figure 38 - Ratio of Creep-Fatigue Life Predicted by MDEM to that Predicted by TFR at 500C . 24 Figure 39 - Ratio of Creep-Fatigue Life Predicted by MDEM to that Predicted by TFR
27、 at 550C . 24 Alternative Simplified Creep-Fatigue Design Methods STP-NU-041 v Figure 40 - Ratio of Creep-Fatigue Life Predicted by MDEM to that Predicted by TFR at 600C 25 Figure 41 - Formulation of Manson-Coffin Type Relation ppppANDH at 550C . 29 Figure 42 - Formulation of Manson-Coffin Type Rela
28、tion ppppANDH at 600C . 29 Figure 43 - Formulation of Manson-Coffin Type Relation ccccANDH at 550C . 30 Figure 44 - Formulation of Manson-Coffin Type Relation ccccANDH at 600C . 30 Figure 45 - Observed and Predicted Creep-Fatigue Life by SRS Method . 31 Figure 46 - Creep-Fatigue Damage Calculated by
29、 SRS Method 31 Figure 47 - Comparison of Pure Cyclic Creep Life Determined by Curve Fitting and that Determined by Numerical Integration of Creep Damage at 550C . 32 Figure 48 - Comparison of Pure Cyclic Creep Life Determined by Curve Fitting and that Determined by Numerical Integration of Creep Dam
30、age at 600C . 32 Figure 49 - Difference of Yield Stress between Static and Cyclic Stress-Strain Relations at 550C 33 Figure 50 - Difference of Yield Stress between Static and Cyclic Stress-Strain Relations at 600C 33 Figure 51 - Observed and Predicted Creep-Fatigue Life by SRS Method (Case-1). 34 Fi
31、gure 52 - Observed and Predicted Creep-Fatigue Life by SRS Method (Case-2). 34 Figure 53 - Observed and Predicted Creep-Fatigue Life by SRS Method for Stress Controlled Tests (Case-1 and 2) . 35 Figure 54 - Creep-Fatigue Damage Calculated by SRS Method (Case-1) . 35 Figure 55 - Creep-Fatigue Damage
32、Calculated by SRS Method Shown in Normal Scale (Case-1) 36 Figure 56 - Creep-Fatigue Damage Calculated by SRS Method (Case-2) . 36 Figure 57 - Creep-Fatigue Damage Calculated by SRS Method Shown in Normal Scale (Case-2) 37 Figure 58 - Comparison of Creep-Fatigue Life between SRS (Case-1) and TFR at
33、550C 37 Figure 59 - Comparison of Creep-Fatigue Life between SRS (Case-2) and TFR at 550C 38 Figure 60 - Comparison of Creep-Fatigue Life between SRS (Case-1 and Case-2) and TFR at 600C . 38 Figure 61 - Ratio of Predicted Creep-Fatigue Life by SRS Method to that Predicted by TFR at 550C . 39 Figure
34、62 - Ratio of Predicted Creep-Fatigue Life by SRS Method to that Predicted by TFR at 600C . 39 Figure 63 - Effect of Additive Stress on Stress Relaxation Behavior (Example-1) . 40 Figure 64 - Effect of Additive Stress on Stress Relaxation Behavior (Example-2) . 40 Figure 65 - Effect of Additive Stre
35、ss on Predicted Creep-Fatigue Life . 41 Figure 66 - Comparison of Np, Nc, and Nf (Case-2, 550C, tH =0.5%) . 41 Figure 67 - Observed and Predicted Creep-Fatigue Life with Tr=Nf_obs.x tH (Case-1) 47 Figure 68 - Creep-Fatigue Damage Calculated with Tr=Nf_obs.x tH (Case-1) 47 STP-NU-041 Alternative Simp
36、lified Creep-Fatigue Design Methods vi Figure 69 - Observed and Predicted Creep-Fatigue Life with Tr=2x104hours (Case-2) 48 Figure 70 - Creep-Fatigue Damage Calculated with Tr=2x104hours (Case-2) 48 Figure 71 - Observed and Predicted Creep-Fatigue Life with Tr=fatigue life x tH(Case-3) . 49 Figure 7
37、2 - Creep-Fatigue Damage Calculated with Tr=fatigue life x tH(Case-3) . 49 Figure 73 - Observed and Predicted Creep-Fatigue Life with Tr=1x106hours (Case-4) 50 Figure 74 - Creep-Fatigue Damage Calculated with Tr=1x106hours (Case-4) 50 Figure 75 - Observed and Predicted Creep-Fatigue Life with Tr=1x1
38、06hours and 2E 51 Figure 76 - Creep-Fatigue Damage with Tr=1x106hours and 2E 51 Figure 77 - Observed and Predicted Creep-Fatigue Life under Stress Controlled Conditions (Case-2) . 52 Figure 78 - Creep-Fatigue Damage under Stress Controlled Conditions (Case-2) . 52 Figure 79 - Observed and Predicted
39、Creep-Fatigue Life under Stress Controlled Conditions (Case-3) . 53 Figure 80 - Creep-Fatigue Damage under Stress Controlled Conditions (Case-3) . 53 Figure 81 - Observed and Predicted Creep-Fatigue Life under Stress Controlled Conditions (Case-4) . 54 Figure 82 - Creep-Fatigue Damage under Stress C
40、ontrolled Conditions (Case-4) . 54 Figure 83 - Relationship between Hold Time and Number of Cycles to Failure ( = 2) 55 Figure 84 - Relationship between Hold Time and Number of Cycles to Failure ( = 4) 55 Figure 85 - Relationship between Hold Time and Number of Cycles to Failure (Tr=1x106hours) . 56
41、 Figure 86 - Relationship between Hold Time and Number of Cycles to Failure ( = 2) 56 Figure 87 - Cyclic Stress-Strain Relations and Effects of Hold Time on Them . 57 Figure 88 - Creep-Fatigue Damage Interaction (Tr=1x105hours) 57 Figure 89 - Creep-Fatigue Damage Interaction (Tr=1x106hours) 58 Figur
42、e 90 - Creep Rupture Ductility at Various Temperatures . 60 Figure 91 - Observed and Predicted Creep-Fatigue Life by Hybrid Method, k=0 60 Figure 92 - Observed and Predicted Creep-Fatigue Life by Hybrid Method, k=0.25 . 61 Figure 93 - Observed and Predicted Creep-Fatigue Life by Hybrid Method, k=0.5
43、 . 61 Figure 94 - Observed and Predicted Creep-Fatigue Life by Hybrid Method, k=0.75 . 62 Figure 95 - Observed and Predicted Creep-Fatigue Life by Hybrid Method, k=1 62 Figure 96 - Creep-Fatigue Damage Calculated by Hybrid Method, All Conditions 63 Figure 97 - Relation between k and Standard Deviati
44、on of Life Prediction . 63 Figure 98 - Observed and Predicted Creep-Fatigue Life by Hybrid Method, k=0.33 . 64 Figure 99 - Creep-Fatigue Damage Calculated by Hybrid Method, All Conditions 64 Figure 100 - Observed and Predicted Creep-Fatigue Life by Hybrid Method, k=0 65 Alternative Simplified Creep-
45、Fatigue Design Methods STP-NU-041 vii Figure 101 - Observed and Predicted Creep-Fatigue Life by Hybrid Method, k=0.5 65 Figure 102 - Observed and Predicted Creep-Fatigue Life by Hybrid Method, k=1 . 66 Figure 103 - Relation between k and Standard Deviation of Life Prediction . 66 Figure 104 - Creep-
46、Fatigue Damage Calculated by Hybrid Method . 67 Figure 105 - Observed and Predicted Creep-Fatigue Life by Hybrid Method under Stress Control, k=0 67 Figure 106 - Observed and Predicted Creep-Fatigue Life by Hybrid Method under Stress Control, k=0.5 . 68 Figure 107 - Observed and Predicted Creep-Fati
47、gue Life by Hybrid Method under Stress Control, k=1 68 Figure 108 - Creep-Fatigue Damage Calculated By Hybrid Method under Stress Controlled Conditions 69 Figure 109 - Comparison of Creep-Fatigue Life at Various Strain Ranges at 500C 69 Figure 110 - Comparison of Creep-Fatigue Life at Various Strain
48、 Ranges at 550C 70 Figure 111 - Comparison of Creep-Fatigue Life at Various Strain Ranges at 600C 70 Figure 112 - Ratio of Predicted Creep-Fatigue Life by Hybrid Method to that Predicted by TFR at 500C . 71 Figure 113 - Ratio of Predicted Creep-Fatigue Life by Hybrid Method to that Predicted by TFR
49、at 550C . 71 Figure 114 - Ratio of Predicted Creep-Fatigue Life by Hybrid Method to that Predicted by TFR at 600C . 72 Figure 115 - SMT Methodology. 76 Figure 116 - 4 Bar Model . 77 Figure 117 - Stepped Bar Test Specimen . 77 Figure 118 - Notched Bar Specimen 77 Figure 119 - Stepped Bar Test Results . 78 Figure 120 - Notched Bar Test Results 78 Figure 121 - 3URSRVHG6076SHFLPHQT . 78 Figure 122 - Parameter for
