Numerical Investigation of Thickness Effect on the Crack Parameters

Numerical Investigation of Thickness Effect on the Crack Parameters

Abhijeet Singh* Shalendra Kumar Hira Lal Yadav

Department of Mechanical Engineering, NIT Jamshedpur, Jharkhand 831013, India

Department of Physics, NIT Jamshedpur, Jharkhand 831013, India

Corresponding Author Email:
29 May 2018
30 June 2018
30 June 2018
| Citation



In order to predict the fracture parameters correctly and efficiently, it is very important to look after the factors that affect the crack parameters. Specimen geometry is one such parameter which affects the parameters around the crack tip. This paper numerically investigates the effect of the thickness of the specimen on the crack parameters using the Finite Element Analysis tool ‘ANSYS’. A side edge notched bend specimen was modeled and analyzed under three point bend condition for different specimen thickness. It was observed that with the increase in the thickness, the crack parameters around the crack tip decreases, and this increase in thickness leads to the shift of the state of stress from plane stress to plane strain.


thickness effect, side edge notched bend, crack mouth opening displacement, crack tip opening displacement, stress intensity factor

1. Introduction
2. Numerical Analysis
3. Results and Discussion
4. Conclusion

[1] Griffith AA, Eng M. (1921). VI. The phenomena of rupture and flow in solids. Phil. Trans. R. Soc. Lond. A, 221(582-593): 163-198.

[2] Irwin GR. (1947). Fracture dynamics. Fracturing of metals. ASM Publication, pp. 147-166.

[3] Irwin GR. (1958). Fracture I. Halldhuch der Physik VI, Flugge Edition. pp. 558-590. 

[4] Wells AA. (1963). Application of fracture mechanics at and beyond general yielding. British Welding Journal 10.

[5] Hudson CM, Newman Jr JC. (1973). Effect of specimen thickness of fatigue-crack-growth behavior and fracture toughness of 7075-T6 and 7178-T6 aluminum alloys. NASA TN D-7173.

[6] Murthy NS, Rakesh N, Srinath LS. (1983). Effect of specimen thickness on mode I stress intensity factor in photoelastic investigations. Engineering Fracture Mechanics 18(6): 1201-1205.

[7] Mahmoud S, Lease K. (2003). The effect of specimen thickness on the experimental characterization of critical crack-tip-opening angle in 2024-T351 aluminum alloy. Engineering Fracture Mechanics 70(3-4): 443-456.

[8] Paleebut S. (1979). CTOD and COD measurements on compact tension specimens of different thicknesses. MS thesis, Michigan State University, East Lansing, Michigan.

[9] Newman Jr JC, Dawicke DS, Bigelow CA. (1992). Finite-element analyses and fracture simulation in thin-sheet aluminum alloy. Durability of Metal Aircraft Structures 167–86.

[10] Granados-Alejo V, Rubio-González C, Vázquez-Jiménez CA, Banderas JA, Gómez-Rosas G. (2018). Influence of specimen thickness on the fatigue behavior of notched steel plates subjected to laser shock peening. Optics & Laser Technology 101: 531-544.

[11] Singh A, Kumar S, Yadav HL. (2018). Numerical parametric study of crack parameters near crack tip. International Journal of Mechanical and Production Engineering Research and Development 8(1): 83-92.