Paper Titles
An Investigation on Piston Pin Seat Fatigue Life on the Mechanical Fatigue Experiments
p.527
Fracture Failure Prediction of a Mode III Crack in Orthotropic Functionally Graded Strip
p.531
Improvement of Earthquake-Resistant Performance of Squat Shear Walls under Reversed Cyclic Loads
p.535
Vibration-Based Damage Detection of Composite Wingbox Structures Using Improved Hilbert-Huang Transform
p.539
Effect of Geometry Factors on Dynamic Fracture Behavior for Mechanical Heterogeneous Welded Joint
p.543
Feature Extraction for Gear Failure Detection Based on Nonlinear Mapping
p.547
Failure Behavior of Pressurized Spherical Tanks Depending on Manufacturing Method
p.551
Plastic Zone Study by Means of Tri-Dimensional Finite Element Models on Fatigue Crack Closure
p.555
Maintenance Scheduling in Risk Assessment Procedures
p.559

Effect of Geometry Factors on Dynamic Fracture Behavior for Mechanical Heterogeneous Welded Joint

Article Preview

Abstract:

Welded joint is a mechanical heterogeneous body, which is composed of base metal, weld metal and heat affected zone (HAZ). Many welded structures endure dynamic load in service. Mechanical heterogeneity has important influence on dynamic fracture behaviour of welded joint. In the present investigation, dynamic fracture parameter of J-integral of undermatched three-point-bending (TPB) welded joint specimens containing longitudinal crack with different geometry were computed. The strain rate near crack tip reaches 103 under the impact velocity of 5m/s, so dynamic properties under corresponding strain rate should be used in dynamic analysis. The results of instrumented impact experiment were used as the input parameters in the computation. Dynamic J-integral was evaluated using virtual crack extension (VCE) method of MARC finite element code in 3-D condition. Dynamic J-integral evaluated by VCE method is path independent. The value of dynamic J-integral curve increases with loading time smoothly, so inertia force has little influence on dynamic J-integral. The values of dynamic J-integral decrease with increase of weld width. When the weld width is bigger than 5mm the influence of base material on weld metal is not evident. The influence of initial crack length on dynamic J-integral is complicate. The value of dynamic J-integral of the computation model with initial crack length of a/W=1/4 is the highest, and that of the computation model with initial crack length of a/W=1/8 is the lowest. The results are helpful for dynamic fracture evaluation of macro-heterogeneous welded joints.

You might also be interested in these eBooks
Fracture and Damage Mechanics V View Preview

Info:

Periodical:

Key Engineering Materials (Volumes 324-325)

Pages:

543-546

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.324-325.543

Citation:

Cite this paper

Online since:

November 2006

Authors:

Fu Qiang Tian, Xiao Yan Li, Yao Wu Shi

Keywords:

Dynamic J-Integral, Mechanical Heterogeneity, Weld Joint

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2006 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] J. R. Rice: J. Appl. Mech. Vol. 35 (1968), p.379.

Google Scholar

[2] S. N. Atluri: Eng. Fract. Mech. Vol. 16 (1982), p.341.

Google Scholar

[3] A. Haddi, D. Weichert: Comp. Mat. Sci. Vol. 8 (1997), p.251.

Google Scholar

[4] S. Prasannakumar, E. G. Ramachandran, J. Ruge: Metal Constr. Vol. 15 (1983), p.142.

Google Scholar

[5] K. Satoh, M. Toyoda: Trans. of JWS Vol. 13 (1982), p.30.

Google Scholar

[6] W. Ma, S. Zhang and X. Tian: Chin. J. Mech. Eng. Vol. 23 (1987), p.43.

Google Scholar

[7] K. H. Schwalbe: Int. J. Fract. Vol. 62 (1993), p.1.

Google Scholar

[8] F. Q. Tian, D. Y. He, X. Y. Li, Y. W. Shi and D. Zhang: Acta Metallur. Sinica (English Letters) Vol. 17 (2004), p.934.

Google Scholar

[9] Y. Ueda, Y. Shi, S. Sun and H. Murakawa: Trans. JWRI Vol. 26 (1997), p.133.

Google Scholar