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
Synopsis:
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 Naga,
Chennai, Tamilnadu (ST)
India
Phone : 91-04342 266031
Mobile: 91-09941112599
E-mail : kmanimudi_me@yahoo.co.in
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