Manimudi K.




Name            : Manimudi K.

Designation  : Lecturer

Qualification: Master of Engineering (CAD/CAM)


ME Dissertation work (2006):


“Strain Energy Release Rate (SERR) for an edge crack at the bi-material

  interface in an orthotropic plate subjected to tensile and bending loads”


Internal (University) Guide: Mr. R. Ganesh Kumar



Damage tolerant design procedures based on Fracture Mechanics principles have been applied to ensure safety of structural components containing cracks in aerospace, marine, nuclear and allied fields. These procedures have been successfully used in the design of structures made of monolithic materials containing cracks with crack tips exhibiting limited yielding. The study of fatigue fracture behavior of monolithic material is carried out using fracture parameters like Stress Intensity Factor (SIF’s) (KI, KII and KIII) and Strain Energy Release Rate (SERR) components (GI, GII and GIII) under given loading conditions.


Over the past two decades efforts have been made to extend the concepts of Linear Elastic Fracture Mechanics (LEFM) to the study of interface crack problems between two dissimilar isotropic/ orthotropic materials and to propose fracture parameters similar to the one used for monolithic materials. The introduction of composites as structural material in engineering and the increasing use of bonded joints have dragged the attention of researchers to interface crack problems.


The LEFM based solution to interface crack predicts complex singularity as against the conventional “root r singularity” encountered for cracks in monolithic materials. The complex singularity gives rise to oscillatory stress field ahead of the crack tip and oscillatory displacement behind the crack tip. The oscillatory displacement field behind the crack gives rise to the interpenetration of the crack faces.  The contact zone model is one of the efficient and commonly used approaches to study the fracture behaviour of interface crack problems.


In the current thesis FEM approach is proposed to carry out a parametric study of fracture parameters for an edge interface crack in an orthotropic plate subjected to combined tensile and bending loads. The front-end commercial software ANSYS with its fracture analysis capabilities is used. The FEM model is generated using eight noded isoparametric quadrilateral elements. The frontal solver is used in the solution of FEM calculations. The major outcome of the research investigations is that even though the crack is under Mode I loading, the crack propagates in Mode II fashion due to the dominance of GII SERR component.   


Key Words: Interface crack, Orthotropic media, Contact zone, Finite Element Method


Contact Details:


Dept. of Mechanical Engineering

Jeppiaar Engineering College

Jeppiaar Naga, Old Mahabalipuram Road

Chennai, Tamilnadu (ST)



Phone : 91-04342 266031

Mobile: 91-09941112599

E-mail :



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