DOI QR코드

DOI QR Code

Development of Integrated Fatigue Strength Assessment System

피로강도평가를 위한 통합 전산 시스템의 개발

  • Published : 2001.02.01

Abstract

An integrated fatigue strength assessment system was computerized. The system developed consists of 9 modules: user interface, cycle counting, load history construction, data searching, fatigue properties estimation, fatigue data analysis, true stress and strain analysis, expert system for crack initiation life prediction, fatigue crack initiation and propagation life prediction. Fatigue strength database also was included in this system. The fatigue expert system helps a beginner to predict a fatigue crack initiation life in fatigue strength assessment. The expert system module in this system is developed on the personal computer by using C language and UNiK, an expert system developing tool. To evaluate the system, the results of test under variable loading of SAE and failure data from a field were analyzed. The evaluation show that the system provided fatigue life prediction within 3-scatter band and gave reasonable predictions. To get more accurate predictions of fatigue life without fatigue properties, we recommend utilizing the system along with the fatigue strength database.

Keywords

Fatigue Life Prediction;Expert System;Load History;Fatigue Properties

References

  1. Wetzel, R. M., 1977, Fatigue Complex Loading : Analyses and Experiments, The Society of Automotive Engineers
  2. Coffin, L. F. Jr., 1954, 'A Study of the Effects of Cyclic Thermal Stresses on a Ductile Metal,' Trans ASME, Vol. 76,pp. 931-950
  3. The society of Materials Science, 1983, JSME Data Book on Fatigue Crack Growth Rates of Metallic Materials, Vol. 1, Kyoto, Japan
  4. 하재선, 송지호, 이시중, 1988, '변동하중하의 피로수명예측 제 1 보:피로균열발생까지의 수명-,' 대한기계학회 논문집 제 12 권 제 4 호, pp. 760-780
  5. Basquin, O. H., 1910, 'The Exponential Law of Endurance Tests,' Am. soc. test. mater. proc., Vol. 10, pp. 625-630
  6. Park, J. H. and Song, J. H., 1995, 'Detailed Evaluation Methods For Estimation of Fatigue Properties,' International journal of fatigue, Vol. 17, No. 5, pp. 365-373 https://doi.org/10.1016/0142-1123(95)99737-U
  7. 빅준협, 송지호, 이시중, 1988, '변동하중하의 피로수명예측을 위한 전문가 시스템,' 대한기계학회 추계학술대회논문집 (Ⅰ),pp.225-229
  8. 박준엽, 송지호, 1988, '피로강도 데이터베이스의 구축,' 대한기계학회 논문집 제 22 권 제 11 호, pp. 1947-1955
  9. 이재규, 최형림, 김현수, 서민수, 주석진, 지원철, 1996, 전문가 시스템 원리와 개발, 법영사
  10. 송지호, 김종한, 김정엽, 1989, '유사랜덤하중 파형 작성과 이를 이용한 랜덤하중하의 표면과로균열진전에 관한 기초적 검토,' 대한기계학회 논문집 제 13 권 제 1 호,pp. 125-134
  11. 송지호, 1994, '피로건전성 평가 시스템 개발에 관한 연구,' 대한기계학회 춘계학술대회논문집 (Ⅰ),pp.25-32
  12. 박종주, 서상민, 서명원, 최용식, 김영진, 1994, '재료 물성치 측정 및 피로수명평가 시스템의 개발,' 대한기계학회 논문집 제 18 권 제 16 호, pp. 1465-1473
  13. 강득수, 박준협, 송지호, 1994, '피로강도평가를 위한 전문가 시스템 구축,' 대한기계학회춘계학술대회논문집 (Ⅰ),pp. 103-106
  14. 정태형, 변준형, 이동형, 1991, '치차의 강도설계 전문가 시스템 개발연구,' 대한기계학회 춘계학술대회논문집, pp.335-338
  15. 이시중, 송지호, 하재선, 1988, '변동하중하의 피로수명예측- 제2 보:피로균열발생수명 예측을 위한 컴퓨터 소프트웨어,' 대한기계학회논문집 제 12 권 제 6 호, pp. 1350-1357
  16. Kawamo, W., 1990, 'State of the Art of Database and Softwares on the Fatigue and Crack Propagation in Japan,' Proceedings of Fatigue '90, Vol. IV, pp. 2449-2459
  17. McMahon, C. A., et al. , 1990, 'Knowledge-Based Systems for Design for Fatigue,' Proceedings of Fatigue '90, Vol.IV,pp.2461-2466
  18. 菊川眞, 城野政弘, 宋智浩, 1972, '繰返し塑性ひずみと累積疲勞損傷(疲勞限度以下の應力による疲勞損傷),' 材料 Vol. 21, pp. 753-758
  19. Corten, H. T. and Dolan, T. J. , 1956, 'Cumulative Fatigue Damage,' Proc. of International Conference on Fatigue of Metals, pp. 235-246
  20. Freudenthal, A. M. and Heller, R. A., 1958, 'On stress Interaction in Fatigue and a Cumulative Damage Rule : Part I-2024 Aluminum and SAE4330 Steel Alloys,' wadctr, pp. 58-69
  21. Miner, M. A., 1945, 'Cumulative Damage in Fatigue,' Journal of Applied Mechanics, Trans., ASME Vol. 12, pp. A159-164