The Experiment Research of Continual Extension of Surface Crack

Abstract:

The automatization of crack expand simulation is carried out by the programmer, using the simulation technique of singular unit, base on the ANSYS software. The nodes are dispersed by crack front. The singular unit is using to radiate from the nodes. The restriction is used at the edge of model. The stress intensity factor is worked out. The expansion ratio is confirmed. Then the displacement of crack expansion of the nodes is resolved. The way of expansion of crack front is orthogonal. The semi-ellipse curve of crack expand is worked out by numeric analysis. The simulation of crack expansion is carried out. The system of MTS（Material test system）810 from USA is used. And the experiment of crack expand is carried out with the load of tension. On the other side, the new crack front is fitted to get continual extension simulation.

• Periodical: Advanced Materials Research (Volumes 97-101)
• Pages: 2758-2763
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.97-101.2758
• Online since: March 2010
• Authors: Zhan Xun Song, Ji Long Xie, Huai Rui Zhao
• Keywords: ANSYS, Semi-Ellipse Surface Crack, Simulation Techniques, Singular Unit

References

[1] R Galdos. Finite element technique to simulate the stable shape evolution of planar cracks with an application to semi-elliptical surface crack in a biomaterial finite solid [J]. Int. J. Num. Meth Rngng. (S0961-5539), 1997, 40: 905-917.

DOI: 10.1002/(sici)1097-0207(19970315)40:5<905::aid-nme94>3.0.co;2-3

[2] Newman Jr J C，Raju I S．An empirical stress intensity factor equation for the surface crack[J] ．Engng Fracture Mech，1981，15；185-1 92.

[3] J Cervenka, V E Saouma. Numerical evaluation of 3-D SIF for arbitrary finite element meshes [J]. Engng. Fract. Mech. (S0013-7944), 1997, 57: 541-563.

DOI: 10.1016/s0013-7944(97)00024-6

[4] X. B Lin. Numerical simulation of fatigue crack growth [D]. PH. D Thesis, The University of Sheffield, UK, 1994. 99-102.

[5] C.G. Hwang, P.A. Wawrzynek, A.R. Ingraffea. On the virtual crack extension method for calculating the derivatives of energy release rates for a 3D planar crack of arbitrary shape under model-I loading, Engineering Fracture Mechanics[J], 68(2001).

DOI: 10.1016/s0013-7944(01)00002-9

[6] Hellen T K．On the method of virtual crack extension[J]．Int J Numer Meth Eng．1975，9(1) ；187-207.

[7] A. Bacila, X. Decoopman, et al. Computer simulation of fatigue crack propagation under random loading conditions[J], International Journal of Fatigue 29 (2007) 1772-1780.

DOI: 10.1016/j.ijfatigue.2007.02.026

[8] P E O'Donoghue, S N Atluri, D S Pipkins. Computational strategies for fatigue crack growth in three dimensions with application to aircraft components [J]. Engng. Fract. Mech. (S0013-7944), 1995, 52: 51-64.

DOI: 10.1016/0013-7944(94)00329-g

[9] Henshell R D, Shaw K G. Crack tip finite elements are unnecessary[J]. Int J Numer Meth Engng, 1975, 9: 495-507.

DOI: 10.1002/nme.1620090302

[10] Barsoum R S, On the use of isoparametric finite elements in linear fracture mechanics [J], Int J Numer Meth Engng, 1976, 10: 25-37.

DOI: 10.1002/nme.1620100103

[11] PARIS P, ERDOGAN F. A critical analysis of crack growth laws [J]. J. Basic Eng, 1963, 85(3): 528-534.

DOI: 10.1115/1.3656902

[12] FORMAN R G, KEARNEY V E, ENGLE R M. Numerical analysis of crack propagation in cyclic-loaded structure[J]. J. Basic Eng, 1967, 89(3): 459-464.

DOI: 10.1115/1.3609638

[13] ELBER W. The significance of fatigue crack closure[C] Damage Tolerate in Aircraft Structures, ASTM STP 486. Philadophia: American Society for Testing and Material, 1971: 230-242.

DOI: 10.1520/stp26680s