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ASME STP PT 091 2021

ASME STP PT 091 2021

$75.42

ASME STP-PT-091 – 2021 Automated External Pressure Chart Generation

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ASME 2021
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This STP describes the development of a computer program for generating normalized stress-strain curves from raw data and development of a computer program for generating external pressure chart from normalized stress-strain curves. Part 1 of this research program is to develop a software program for plotting stress-strain diagrams for a given material from data furnished by users. The stress-strain diagram is then normalized based on the yield stress and modulus of elasticity published in the ASME Boiler and Pressure Vessel Code, Section II, Part D. The stress-strain curve is then used to develop an external pressure curve. The software program for this project is Excel Visual Basic for Applications. The input sheet permits the user to enter furnished stress-strain data as well as published modulus of elasticity and yield stress. The program then generates a normalized stress-strain curve. Part 2 of this research program was to develop a software program for plotting External Pressure Charts (EPC) from normalized stress-strain curves obtained from Part 1 for ASME Boiler and Pressure Vessel Code, Section VIII, Division 1 applications. The External Pressure Charts are based on the yield stress and modulus of elasticity published in the ASME Boiler and Pressure Vessel Code, Section II, Part D. The software program for this part of the project is Excel Visual Basic for Applications. The input sheet permits the user to enter furnished stress-strain data as well as published modulus of elasticity and yield stress. The program then generates an External Pressure Chart.

PDF Catalog

PDF Pages PDF Title
4 TABLE OF CONTENTS
6 FOREWORD
7 EXECUTIVE SUMMARY
8 ABBREVIATIONS AND ACRONYMS
9 1 INTRODUCTION
10 2 BACKGROUND INFORMATION
12 Figures
Figure 2-1: Normalization of Stress-Strain Diagram
13 3 SOFTWARE PROGRAM
Figure 3-1: Types of Stress-Strain Diagrams
14 Figure 3-2: Stress-Strain Data Configuration
16 4 INSTRUCTIONS FOR INPUT SHEETS
17 5 GENERAL PROCEDURE FOR PLOTTING EXTERNAL PRESSURE CHART
18 Figure 5-1: Stress-Strain Curve with an Elastic and Nonlinear Portions (Type 1)
Figure 5-2: Nonlinear Stress-Strain Curve (Type 2)
19 Figure 5-3: Elastic-Perfectly Plastic Stress-Strain Curve (Type 3)
20 6 DETAILED STEPS IN OBTAINING THE EPC IN THE SOFTWARE PROGRAM
21 Tables
Table 6-1: Sample Calculations for ET Moving Average
22 Figure 6-1: Moving Average Values of ET Data Points
23 7 INSTRUCTIONS FOR INPUT SHEETS
24 8 PROGRAM OUTPUT
26 Table 8-1: Output of Supplemental Data
30 REFERENCES
31 APPENDIX A – PEARSON’S CORRELATION COEFFICIENT
Table A-1: Stress-Strain Data
32 Table A-2: Covariance of the Values in Table A-1
Table A-3: Standard Deviation of the Values in Table A-1
36 Figure A-1: Stress-Strain Values
37 APPENDIX B – PART 1 EXAMPLES
Table B-1: Stress-Strain Data for Nickel Alloy N12160 at 200oF
45 Figure B-1: Normalized Stress-Strain Curve for Nickel Alloy N12160 at 200oF Plotted to 1% Strain
Figure B-2: Normalized Stress-Strain Curve for Nickel Alloy N12160 at 200oF Plotted to 0.05% Strain
46 Figure B-3: Comparison of Normalized Stress-Strain Curve for Nickel Alloy N12160 at 200oF using Digital and Manual Methods
47 Table B-2: Stress-Strain Data for Nickel Alloy N12160 at 400oF
55 Figure B-4: Normalized Stress-Strain Curve for Nickel Alloy N12160 at 400oF Plotted to 1% Strain
Figure B-5: Comparison of Normalized Stress-Strain Curve for Nickel Alloy N12160 at 400oF using Digital and Manual Methods
56 Table B-3: Stress-Strain Data for Nickel Alloy N12160 at 1500oF
64 Figure B-6: Normalized Stress-Strain Curve for Nickel Alloy N12160 at 1500oF Plotted to 1% Strain
Figure B-7: Comparison of Normalized Stress-Strain Curve for Nickel Alloy N12160 at 1500oF using Digital and Manual Methods
65 APPENDIX C – PART 2 EXAMPLES
Figure C-1: External Pressure Curve for Nickel N12160 at 200oF
66 Figure C-2: Comparison between Computer Generated and Manual Methods for N12160 at 200oF
67 Figure C-3: External Pressure Curve for Nickel N12160 at 400oF
68 Figure C-4: External Pressure Curve for Nickel N12160 at 400oF and PL = 8.0 ksi in the Stress-Strain Diagram
69 Figure C-5: Comparison between Computer Generated and Manual Methods for N12160 at 400oF and PL = 8.0 ksi in the Stress-Strain Diagram
70 Figure C-6: External Pressure Curve for Nickel N12160 at 1500oF
71 Figure C-7: External Pressure Curve for Nickel N12160 at 1500oF and PL = 11.0 ksi in the Stress-Strain Diagram
72 Figure C-8: Comparison between Computer Generated and Manual Methods for N12160 at 1500oF and PL = 11.0 ksi in the Stress-Strain Diagram
73 Figure C-9: External Pressure Chart for Nickel N12160 at Temperatures 200oF and 400oF

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