Computation of Onset and Growth of Delamination in Double Cantilever beam Specimens Subjected to Fatigue Loading

Krishna Lok Singh; Madhu K.S.; Mallikarjun Vaggar

doi:10.14429/dsj.64.4069

Krishna Lok Singh Structural Technologies Division, National Aerospace Laboratories, Bangalore
Madhu K.S. Structural Technologies Division, National Aerospace Laboratories, Bangalore
Mallikarjun Vaggar Aeronautical Engineering Department, Dayananda Sagar College of Engineering, Bangalore

DOI: https://doi.org/10.14429/dsj.64.4069

Keywords: Delamination onset, growth, double cantilever beam, fatigue, Paris law

Abstract

In this article, the delamination onset and growth behavior of double cantilever beam (DCB) specimens has been presented. The modeling of a debonded region using master and slave surface technique for DCB specimens is done in ABAQUS CAE. The analysis of DCB specimens comprising of fatigue cyclic load has been done in ABAQUS. An onset and Paris delamination growth regimes are plotted. The growth regime being linear in log-log scale, the prediction of constants of this regime has been obtained using the polyfit command in the MATLAB environment. To obtain these constants has been explained in this article. Comparison of experimental and analytical results is shown for delamination growth. The strain energy release rate values for threshold and critical are indicated on the graphs. The number of cycles for delamination onset and growth has been tabulated for various load cases.

Defence Science Journal, Vol. 64, No. 4, July 2014, pp. 400-405, DOI:http://dx.doi.org/10.14429/dsj.64.4069

Author Biographies

Krishna Lok Singh, Structural Technologies Division, National Aerospace Laboratories, Bangalore

Dr Krishna Lok Singh did his BE from University Visvesvaraya College of Engineering and ME from M.S. Ramaiah Institute of Technology, of Bangalore University, in 1993 and 1996, respectively. He obtained his PhD (Aerospace Engineering) from the Indian Institute of Science in 2003. Currently, he is a senior scientist in the Structural Technologies Division of the National Aerospace Laboratories, Bangalore. His primary fields of interest are : Computational methods, fatigue of structures and materials and health monitoring and management of aerospace vehicles.

Madhu K.S., Structural Technologies Division, National Aerospace Laboratories, Bangalore

Mr Madhu K.S. did his BE (Mechanical Engineering) under Vivesvaraya Technological University, Belgaum, in 2011. Presently he is working as Mechanical Engineer in Aero Structures Group of Safran Engineering Services India Pvt. Ltd. Bangalore.

Mallikarjun Vaggar, Aeronautical Engineering Department, Dayananda Sagar College of Engineering, Bangalore

Wg. Cdr. Mallikarjun Vaggar (Retd) obtained MTech (Mechanical Engineering) from Institute of Armament Technology, Pune University, 1990. Currently he is pursuing his PhD, in Mechanical Engineering, Vivesvaraya Technological University (VTU) Belgaum. He also holds the position of Professor at Aeronautical Engineering Department of Dayananda Sagar College of Engineering, Bangalore.