대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

  • 제24권3호
  • /
  • Pages.567-580
  • /
  • 2000
  • /
  • 1226-4873(pISSN)
  • /
  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지
DOI QR코드

DOI QR Code

점용접시편의 과부하해석 및 유효 J-적분에 의한 피로수명예측

Overload Analysis and Fatigue Life Prediction Using an Effective J-Integral of Spot Welded Specimens

  • 발행 : 2000.03.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

This paper proposes an integrated approach, which is independent of specimen geometry and loading type, for predicting the fatigue life of spot welded specimens. We first establish finite element models reflecting the actual specimen behaviors observed on the experimental load-deflection curves of 4 types of single spot welded specimens. Using finite element models elaborately established, we then evaluate fracture parameter J-integral to describe the effects of specimen geometry and loading type on the fatigue life in a comprehensive manner. It is confirmed, however, that J-integral concept alone is insufficient to clearly explain the generalized relationship between load and fatigue life of spot welded specimens. On this ground, we introduce another effective parameter $J_e$ composed of $J_I$, $J_{II}$, $J_{III}$, which has been demonstrated here to more sharply define the relationship between load and fatigue life of 4 types of spot welded specimens. The crack surface displacement method is adopted for decomposition of J, and the mechanism of the mixed mode fracture is also discussed in detail as a motivation of using $J_e$.

키워드

참고문헌

  1. Pook, L. P., 1975, 'Fracture Mechanics Analysis of the Fatigue Behaviour of Spot Welds,' International Journal of Fracture, Vol. 11, pp. 173-176
  2. Pook, L. P., 1975, 'Approximate Stress Intensity Factors for Spot and Similar Welds,' NEL Report No. 588, National Engineering Laboratory, Glasgow
  3. Wang, P. C. and Ewing, K. W., 1988, 'A J-integral Approach to Fatigue Resistance of a Tensile-Shear Spot Weld,' SAE Paper 880373
  4. Wang, P. C. and Ewing, K. W., 1991, 'Fracture Mechanics Analysis of Fatigue Resistance of Spot Welded Coach-Peel Joints,' Fatigue and Fracture of Engineering Materials and Structures, Vol. 14, No. 9. pp. 915-930 https://doi.org/10.1111/j.1460-2695.1991.tb00725.x
  5. 이형일, 김남호, 이태수, 2000, '점용접시편의 극한하중 및 피로특성에 관한 실험적 고찰,' 대한기계학회 논문집, 제24권, 제1호, pp. 38-51
  6. Shepard, S. D., 1993, 'Estimation of Fatigue Propagation Life in Resistance Spot Welds,' Advances in Fatigue Lifetime Predictive Techniques: ASTM STP 1211, Vol. 2, Mitchell, M. R. and Landgraf, R. W. (Eds), ASTM, pp. 169-185
  7. Zuniga, S. M., 1994, Predicting Overload Pull-Out Failure in Resistance Spot Welded Joints, Chapters 3-6. Ph. D. Dissertation, Department of Mechanical Engineering, Stanford University, CA
  8. 이태수, 이형일, 신수정, 1998, '점 용접점 파단의 정량적 모델-1. 파단조건식 ,' 자동차 공학회논문집, 제6권, 제6호, pp 40-52
  9. 신수정, 이형일, 이태수, 최양욱, 1999, '점 용접점 파단의 정량적 모델- 2. 판형구조해석,' 자동차공학회논문집, 제7권, 제1호, pp. 161-172
  10. Matos, P. P. L., McMeeking, R. M., Chara-lambides, P. G. and Drory, M. D., 1989, 'A Method for Calculating Stress Intensities in Bimaterial Fracture,' International Journal of Fracture, Vol. 40, pp. 235-254 https://doi.org/10.1007/BF00963659
  11. Anderson, T. L., 1995, Fracture Mechanics, 2nd Edition, Chapters 2-3, CRC Press
  12. ABAQUS Version 5.5 User's Manual, 1995, Hibbitt, Karlsson and Sorensen, Inc., Pawtucket, RI
  13. Tvergaard, V., 1981, 'Influence of Voids on Shear Band Instabilities under Plane Strain Condition,' International Journal of Fracture Mechanics, Vol. 17, pp. 389-407 https://doi.org/10.1007/BF00036191
  14. Gurson, A. L., 1977, 'Continuum Theory of Ductile Rupture by Void Nucleation and Growth: Part I- Yield Criteria and Flow Rules for Porous Ductile Media,' Journal of Engineering Materials and Technology, Vol. 99, pp. 2-15
  15. Parks, D. M., 1977, 'The Virtual Crack Extension Method for Nonlinear Material Behavior,' Computer Methods in Applied Mechanics and Engineering, Vol. 12, pp. 353-364 https://doi.org/10.1016/0045-7825(77)90023-8
  16. Shih, C. F., Moran, B. and Nakamura, T., 1986, 'Energy Release Rate along a Three-Dimensional Crack Front in a Thermo-Mechanical Field,' International Journal of Fracture, Vol. 30, pp. 79-102 https://doi.org/10.1007/BF00034019
  17. Knowles, J. K. and Sternburg, E., 1972, 'On a Class of Conservation Laws in Linearized and Finite Elastostatics,' Archive for Rational Mechanics and Analysis, Vol. 44, No. 3, pp. 187-211 https://doi.org/10.1007/BF00250778
  18. Hellen, T. K. and Blackburn. W. S., 1975, 'The Calculation of Stress Intensity Factors for Combined Tensile and Shear Loading,' International Journal of Fracture, Vol. 11, pp. 605-617 https://doi.org/10.1007/BF00116368
  19. Gdoutos, E. E., 1990, Fracture Mechanics Criteria and Applications, Kluwer, The Netherlands
  20. Jurf, R. A. and Pipes, R. B., 1982, 'Interlamina Fracture of Composite Materials,' Journal of Composite Materials, Vol. 16, pp. 386-394 https://doi.org/10.1177/002199838201600503
  21. Erdogan, F. and Sih, G. C, 1963, 'On Crack Extension in Plates under Plane Loading and Transverse Shear,' Journal of Basic Engineering, Vol. 85, pp. 519-527
  22. Broek, D., 1986, Elementary Engineering Fracture Mechanics, 4th Edition, Martinus Nijhoff Publishers, Chapter 14
  23. Melin, S., 1987, 'Fracture from a Straight Crack Subjected to Mixed Mode Loading,' International Journal of Fracture, Vol. 32, pp. 257-263 https://doi.org/10.1007/BF00018544