Kingshuk Bose

Assistant Professor

Department of Mechanical Engineering & Engineering Science

The University of North Carolina at Charlotte

9201 University City Blvd.

Charlotte NC 28223

Research Interests:

 

1. Constitutive modeling of metals, polymers, and advanced materials: An important component of the numerical simulations of modern structures is the accurate modeling of the constitutive behavior of the constituent materials of that structure. While metals are still heavily used for many engineering applications, they are rapidly being replaced by other materials such as polymers, ceramics, and advanced composites. The macroscopic behavior of these materials depends on variables such as the microstructure and processing history, as well as external factors such as temperature and rate of applied loading/deformation. Depending upon the application, a realistic model needs to accurately account for one or more of the above variables. My interests involve developing constitutive models for materials for use in advanced finite element simulations (e.g. crashworthiness simulations for automobiles). I am specifically interested in modeling advanced metallic alloys (ultra-fine grained, nanocrytalline) and powdered materials, polymeric materials such as thermoplastics, filled rubbers, biological tissues, etc., foams and advanced ceramics. My prior work in this area (as a development engineer at ABAQUS Inc.) involved: (i) development of a constitutive model for the elastoplastic behavior of gray cast iron which is characterized by a markedly different (plastic) response in tension versus compression, (ii) numerical implementation of a two-layer viscoplastic material model that is useful in the simulation of low-cycle fatigue in automotive engine components, (iii) implementation of a model for Mullins effect that simulates strain induced damage  in filled rubbers, (iv) improvements to modeling the dynamic behavior of polymers, etc.

2. Numerical/Analytical Fracture and Damage Mechanics: With advances in numerical simulation techniques and computational resources, engineers are increasingly extending their product design and development process to include "end-of-life" or failure analysis of products. This includes analysis of progressive damage followed by eventual fracture in situations where a structure is loaded well beyond the intended design loads, as well as progressive damage under sub-critical cyclic loading--commonly referred to as fatigue. While great advances have been made in this general area in the last few decades, some of these advances have not quite made their way to the hands of the practicing engineer by means of accurate predictive tools. My research interests in this area extend from the classical theoretical analysis of singular crack tip fields for cracks propagating along bi-material interfaces, to some of the recent advances in tools and techniques that facilitate modeling of fracture and failure in everyday numerical simulations. In the former category of problems my Ph.D. dissertation work resulted in the proposal of a ductile mechanism to explain the well-known dependence of fracture toughness on the mode-mix of the applied loading fields, while in the latter category I led some of the effort that went into developing numerical tools for fracture/failure simulations in the well-known finite element software package ABAQUS (V6.5). These include the family of cohesive elements as well the general framework for modeling of progressive damage and failure.

3. Computational Solid Mechanics:  My interests in this area include applications of Computational Solid Mechanics in solving practical engineering problems, as well as the development of new and improved algorithms for obtaining solutions to a system of equations that describe the idealized behavior of a system. One of the current research areas involve exploring a new algorithm for integrating the system of equations that describe the behavior of certain metals under severe thermo-mechanical loading conditions, such as would occur during metal forming and power metallurgy processes. Another research area involves detailed finite element modeling of the structural creep in clock-springs.

4. Numerical simulation of materials processing: Finite element simulations are heavily used in the metal forming industries to optimize various process parameters as well as predict characteristics of the finished products. Such simulations are valuable in cutting down the cost of repetitive design as well as that of lost material and energy. My specific interests are in the modeling of powder metallurgy simulations such as hot isostatic pressing (HIPing), and developing tools, processes, and/or guidelines that could potentially cut down on the cost of such analyses. This is a new area of research for me and I am working on establishing collaborative efforts with one or more industries that might benefit from this work.

 

Publications:

 

1.      “Stable Crack Growth Under Mixed-Mode Conditions,” Bose, K. and Ponte Castaneda, P., Journal of the Mechanics and Physics of Solids, Vol. 40, No. 5, pp. 1053-1103 (1992)

2.      “The Effect Of Mode Mix On Interfacial Toughness: A Ductile Mechanism,” Bose, K. and Ponte Castaneda, P., Fracture Mechanics: 25th Volume, ASTM STP 1220, F. Erdogan Ed., American Society for Testing and Materials, Philadelphia, (1995).

3.      “Stable Crack Growth Along a Brittle/Ductile Interface—II. Small Scale Yielding Solutions and Interfacial Toughness Predictions,” Bose, K., Mataga, P. A., and Ponte Castaneda, P., International Journal of Solids and Structures, Vol. 36, pp. 1-34 (1999).

4.      “Modeling of stress softening in filled elastomers,” Bose, K., Hurtado, J. A., Snyman, M. F., Mars, W. V., and Chen, J. Q., Constitutive Models for Rubber III, J. J. C. Busfield and A. H. Muhr Ed., Proceedings of the 3rd European Conference on the Constitutive Models for Rubber, London, pp. 223-230 (2003).

5.      “Modeling of progressive damage and failure in ABAQUS: A General Framework,” Bose, K., Hurtado, J. A., Engelmann, B. E., Fox, D. D., Harkness, H., Lu, Y. Y., and Xia, L. (Proceedings of the NAFEMS World Congress 2005; Electronic)

 

Professional Experience:

 

Assistant Professor                                   Dept. of Mechanical Engineering and  Engineering Science        12/2005-present

                                                                UNC Charlotte

Senior Development Engineer(*)              ABAQUS Inc.                                                                          1995-2005

 Technical Support Engineer                     ABAQUS Inc.                                                                          12/1994-1995

 (*) Over ten years of industrial experience as a member of the Mechanics Development Team for the well known finite element software ABAQUS. Worked on a variety of different problems in the broad areas of (i) Development of constitutive models for nonlinear materials, (ii) Development of nonlinear finite elements, (iii) Coupled thermo-mechanical and electro-mechanical problems, (iv) Fracture Mechanics, and (v) Code architecture

 

Courses:

 

MEGR 3225: Introduction to Finite Element Methods

MEGR 8143: Inelastic behavior of solids

 

Current Students:

 

Mr. Ajith Ramesh (Ph.D. program)

Mr. Sameer A. Shaik (Ph.D. program)