Method, computer program product & system
US-2015369697-A1 · Dec 24, 2015 · US
Method and system of deterministic fatigue life prediction for rotor materials
US9541530B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9541530-B2 |
| Application number | US-201313743601-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 17, 2013 |
| Priority date | Jan 23, 2012 |
| Publication date | Jan 10, 2017 |
| Grant date | Jan 10, 2017 |
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Abstract
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A method of fatigue life prediction including: calculating a critical crack size of an object of interest; identifying a first flaw in ultrasound data of the object of interest; determining that the first flaw interacts with a second flaw, the first flaw is to be merged with the second flaw, or the first flaw is isolated; calculating an initial crack size based on the determination; and calculating an increase in the initial crack size due to fatigue and creep to determine a number of load cycles until the initial crack size reaches the critical crack size.
First claim
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What is claimed is: 1. A method for a computing machine to perform fatigue life prediction, the method comprising: calculating a critical crack size of an object of interest, the object being a turbine; identifying, by a data processor, a first flaw in the object from ultrasound data of the object of interest in non-destructive evaluation, the first flaw being a crack in the object and the ultrasound data acquired using a non-destructive evaluation probe; determining that the first flaw interacts with a second flaw, the first flaw is to be merged with the second flaw, or the first flaw is isolated; calculating an initial crack size based on the determination; calculating by a fatigue prediction module of a non-destructive evaluation system, an increase in the initial crack size in the object due to fatigue and creep; determining, by the fatigue prediction module of the non-destructive evaluation system, a number of load cycles until the initial crack size reaches the critical crack size of the object, wherein the initial crack size is calculated using the following equations: RDS = { 1.7 E R S if EFS > 5 2.0 E R S if ERS < 4 E R S [ 2 - 0.3 ( E R S - 4 ) ] otherwise a 0 = 0.5 r RDS wherein a 0 is the initial crack size, RDS is a real flaw size and ERS is an equivalent reflector size of the flaw, ERS being a function of a size of the probe; determining a fatigue life of the turbine based on the number of load cycles; and performing maintenance of the turbine at a service interval based on the fatigue life of the turbine. 2. The method of claim 1 , wherein the object of interest includes part of a turbine generator. 3. The method of claim 2 , wherein the part includes a rotor. 4. The method of claim 1 , wherein the first flaw interacts with the second flaw when a predetermined criteria for interaction is met. 5. The method of claim 1 , wherein the first flaw is to be merged with the second flaw when a predetermined criteria for merging is met. 6. The method of claim 1 , wherein the step of calculating the increase in the initial crack size due to fatigue and creep is repeated until the initial crack size meets or exceeds the critical crack size. 7. The method of claim 1 , wherein a load cycle includes a minimum stress applied to the object, a maximum stress applied to the object, a temperature exposure of the object and a holding time. 8. A system of fatigue life prediction, the system comprising: a memory device for storing a program; a processor of a non-destructive evaluation system, the processor in communication with the memory device, the processor operative with the program
Assignees
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Classifications
- G01N17/00Primary
Investigating resistance of materials to the weather, to corrosion, or to light · CPC title
- G01N29/34Primary
Generating the ultrasonic, sonic or infrasonic waves {, e.g. electronic circuits specially adapted therefor} · CPC title
Digital computing or data processing equipment or methods, specially adapted for specific functions (information retrieval, database structures or file system structures therefor G06F16/00) · CPC title
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- What does patent US9541530B2 cover?
- A method of fatigue life prediction including: calculating a critical crack size of an object of interest; identifying a first flaw in ultrasound data of the object of interest; determining that the first flaw interacts with a second flaw, the first flaw is to be merged with the second flaw, or the first flaw is isolated; calculating an initial crack size based on the determination; and calcula…
- Who is the assignee on this patent?
- Guan Xuefei, Zhen Hui, Zhang Jingdan, and 5 more
- What technology area does this patent fall under?
- Primary CPC classification G01N17/00. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 10 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).