Chandan Kumar Mozumder | University of Notre Dame (original) (raw)

Uploads

Conference Presentations by Chandan Kumar Mozumder

Research paper thumbnail of Thickness based topology optimization for crashworthiness design using hybrid cellular automata

The hybrid cellular automaton (HCA) method has been successfully applied to nonlinear transient t... more The hybrid cellular automaton (HCA) method has been successfully applied to nonlinear transient topology optimization for crashworthiness design. This method utilizes the cellular automata (CA) computing paradigm and nonlinear transient finite element analyses (FEA). The objective in crashworthiness design is to generate energy absorbing structures which can be obtained by uniformly distributing internal energy density (IED). In this paper, the HCA algorithm has been utilized to develop an efficient methodology for synthesizing shell-based structures with optimal material thickness distribution under a dynamic loading event using a thickness based topology optimization. The objective of traditional topology optimization is to redistribute the material within a specified design domain in order to maximize some desired mechanical performance under specified constraints. In thickness based topology optimization, the objective is to redistribute element thickness to meet the desired performance constraints. This methodology is used to tackle complicated problems that involve dynamic events, such as impacts and collisions. The existing commercial thickness optimization tools utilize models under static loading conditions because of the complexities associated with dynamic/impact loading. The HCA based thickness optimization algorithm employs nonlinear transient analyses (via LS-Dyna) to capture material and geometric nonlinearities that occur during a dynamic crash event. Therefore by applying this method to impact problems, the resulting structure will account for all phenomena involved. The effectiveness of the algorithm is demonstrated using a at plate and C-section rail example problem subjected to dynamic impact loading. The structures synthesized by the HCA algorithm are able to meet the manufacturing as well as performance constraints. Copyright © 2008 by the American Institute of Aeronautics and Astronautics, Inc.

Papers by Chandan Kumar Mozumder

Research paper thumbnail of Cost and Mass Optimization for Crashworthiness Design of Shell-Based Structure Using Hybrid Cellular Automata

50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, May 4, 2009

Research paper thumbnail of Topometry optimization of sheet metal structures for crashworthiness design using hybrid cellular automata

Research paper thumbnail of Robust Design: Uncertainty Representation and Propagation

Research paper thumbnail of Synthesis of a Dynamically Loaded Structure with Topology Optimization

SAE International journal of passenger cars, Apr 20, 2009

Research paper thumbnail of Topology Optimization for Synthesizing Extrusion Based Nonlinear Transient Designs

Concept designs synthesized using conventional topology optimization methods are typically not ea... more Concept designs synthesized using conventional topology optimization methods are typically not easily manufacturaed, in that multiple finishing processes are required to construct the component. A manufacturing technique that requires only minimal effort is extrusion. Extrusion is a manufacturing process used to create objects of a fixed cross-sectional profile. Extrusion often minimizes the need for secondary machining, although not necessarily of the same dimensional accuracy as machined parts. The result of using this process is lower costs for the manufacture of the final product. In this paper, a non-gradient hybrid cellular automaton (HCA) algorithm is developed to synthesize constant cross section structures that are subjected to nonlinear transient loading. Examples are presented to demonstrate the efficiency of the proposed methodology in synthesizing these structures. The methodology is first demonstrated for elastic-static modeling. The novelty of the proposed method is the ability to generate constant cross section topologies for plastic-dynamic problems since the issue of complex gradients can be avoided using the HCA method.

Research paper thumbnail of Multi-scale Material Modeling of Fracture and Crack Propagation 1. Introduction

The traditional continuum-based theories of fracture mechanics provide the basic

Research paper thumbnail of Kriging-Assisted Structural Design for Crashworthiness Applications Using the Extended Hybrid Cellular Automaton (xHCA) Framework

Research paper thumbnail of Multi-Material Topology Optimization for Crashworthiness Using Hybrid Cellular Automata

SAE Technical Paper Series

Research paper thumbnail of Design for Crashworthiness of Vehicle Structures Using an Extended Hybrid Cellular Automaton Method

SAE Technical Paper Series

Research paper thumbnail of Crashworthiness design for multiple loading conditions using dynamic weighting factors in HCA framework

13th AIAA/ISSMO Multidisciplinary Analysis Optimization Conference, 2010

Research paper thumbnail of Synthesis of a Dynamically Loaded Structure with Topology Optimization

SAE International Journal of Passenger Cars - Mechanical Systems, 2009

Research paper thumbnail of Topometry optimisation for crashworthiness design using hybrid cellular automata

International Journal of Vehicle Design, 2012

ABSTRACT An objective in crashworthiness design is to obtain energy-absorbing components. This ta... more ABSTRACT An objective in crashworthiness design is to obtain energy-absorbing components. This task has been efficiently undertaken using the Hybrid Cellular Automaton method. This method combines the CA paradigm with nonlinear, dynamic finite element analysis. Lightweight, energy-absorbing topology concepts have been obtained with this approach. This paper furthers the development of the HCA method to an efficient tool for synthesising shell structures using topometry optimisation. The objective is to find the thickness distribution that uniformly distributes the structures internal energy density. This approach addresses problems involving collisions, large displacement and material plastic hardening. The final designs meet manufacturing and performance constraints.

Research paper thumbnail of Thickness Based Topology Optimization for Crashworthiness Design Using Hybrid Cellular Automata

12th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, 2008

The hybrid cellular automaton (HCA) method has been successfully applied to non-linear transient ... more The hybrid cellular automaton (HCA) method has been successfully applied to non-linear transient topology optimization for crashworthiness design. This method utilizes the cellular automata (CA) computing paradigm and nonlinear transient finite element analyses (FEA). The ...

Research paper thumbnail of Topometry optimization of sheet metal structures for crashworthiness design using hybrid cellular automata

by Chandan K. Mozumder The objective in crashworthiness design is to generate plastically deforma... more by Chandan K. Mozumder The objective in crashworthiness design is to generate plastically deformable energy absorbing structures which can satisfy the prescribed force-displacement (FD) response. The FD behavior determines the reaction force, displacement and the internal energy that the structure should withstand. However, attempts to include this requirement in structural optimization problems remain scarce. The existing commercial optimization tools utilize models under static loading conditions because of the complexities associated with dynamic/impact loading. Due to the complexity of a crash event and the consequent time required to numerically analyze the dynamic response of the structure, classical methods (i.e., gradient-based and direct) are not well developed to solve this undertaking. This work presents an approach under the framework of the hybrid cellular automaton (HCA) method to solve the above challenge. The HCA method has been successfully applied to nonlinear tran...

Research paper thumbnail of Crashworthiness design methodology using a hybrid cellular automata algorithm for the synthesis of topologies for structures subject to nonlinear transient loading

Research paper thumbnail of Robust Design: Uncertainty Representation and Propagation

Research paper thumbnail of Topometry optimization of sheet metal structures for crashworthiness design using hybrid cellular automata

Proquest Dissertations and Theses Thesis University of Notre Dame 2010 Publication Number Aat 3441589 Isbn 9781124466712 Source Dissertation Abstracts International Volume 72 03 Section B Page 123 P, 2010

The objective in crashworthiness design is to generate plastically deformable energy absorbing st... more The objective in crashworthiness design is to generate plastically deformable energy absorbing structures which can satisfy the prescribed force-displacement (FD) response. The FD behavior determines the reaction force, displacement and the internal energy that the structure should withstand. However, attempts to include this requirement in structural optimization problems remain scarce. The existing commercial optimization tools utilize models under static loading

Research paper thumbnail of Cost and Mass Optimization for Crashworthiness Design of Shell-Based Structure Using Hybrid Cellular Automata

50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2009

Research paper thumbnail of Crashworthiness Design Methodology Using a Hybrid Cellular Automata Algorithm for the Synthesis of Topologies for Structures Subject to Nonlinear Transient Loading

Research paper thumbnail of Thickness based topology optimization for crashworthiness design using hybrid cellular automata

The hybrid cellular automaton (HCA) method has been successfully applied to nonlinear transient t... more The hybrid cellular automaton (HCA) method has been successfully applied to nonlinear transient topology optimization for crashworthiness design. This method utilizes the cellular automata (CA) computing paradigm and nonlinear transient finite element analyses (FEA). The objective in crashworthiness design is to generate energy absorbing structures which can be obtained by uniformly distributing internal energy density (IED). In this paper, the HCA algorithm has been utilized to develop an efficient methodology for synthesizing shell-based structures with optimal material thickness distribution under a dynamic loading event using a thickness based topology optimization. The objective of traditional topology optimization is to redistribute the material within a specified design domain in order to maximize some desired mechanical performance under specified constraints. In thickness based topology optimization, the objective is to redistribute element thickness to meet the desired performance constraints. This methodology is used to tackle complicated problems that involve dynamic events, such as impacts and collisions. The existing commercial thickness optimization tools utilize models under static loading conditions because of the complexities associated with dynamic/impact loading. The HCA based thickness optimization algorithm employs nonlinear transient analyses (via LS-Dyna) to capture material and geometric nonlinearities that occur during a dynamic crash event. Therefore by applying this method to impact problems, the resulting structure will account for all phenomena involved. The effectiveness of the algorithm is demonstrated using a at plate and C-section rail example problem subjected to dynamic impact loading. The structures synthesized by the HCA algorithm are able to meet the manufacturing as well as performance constraints. Copyright © 2008 by the American Institute of Aeronautics and Astronautics, Inc.

Research paper thumbnail of Cost and Mass Optimization for Crashworthiness Design of Shell-Based Structure Using Hybrid Cellular Automata

50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, May 4, 2009

Research paper thumbnail of Topometry optimization of sheet metal structures for crashworthiness design using hybrid cellular automata

Research paper thumbnail of Robust Design: Uncertainty Representation and Propagation

Research paper thumbnail of Synthesis of a Dynamically Loaded Structure with Topology Optimization

SAE International journal of passenger cars, Apr 20, 2009

Research paper thumbnail of Topology Optimization for Synthesizing Extrusion Based Nonlinear Transient Designs

Concept designs synthesized using conventional topology optimization methods are typically not ea... more Concept designs synthesized using conventional topology optimization methods are typically not easily manufacturaed, in that multiple finishing processes are required to construct the component. A manufacturing technique that requires only minimal effort is extrusion. Extrusion is a manufacturing process used to create objects of a fixed cross-sectional profile. Extrusion often minimizes the need for secondary machining, although not necessarily of the same dimensional accuracy as machined parts. The result of using this process is lower costs for the manufacture of the final product. In this paper, a non-gradient hybrid cellular automaton (HCA) algorithm is developed to synthesize constant cross section structures that are subjected to nonlinear transient loading. Examples are presented to demonstrate the efficiency of the proposed methodology in synthesizing these structures. The methodology is first demonstrated for elastic-static modeling. The novelty of the proposed method is the ability to generate constant cross section topologies for plastic-dynamic problems since the issue of complex gradients can be avoided using the HCA method.

Research paper thumbnail of Multi-scale Material Modeling of Fracture and Crack Propagation 1. Introduction

The traditional continuum-based theories of fracture mechanics provide the basic

Research paper thumbnail of Kriging-Assisted Structural Design for Crashworthiness Applications Using the Extended Hybrid Cellular Automaton (xHCA) Framework

Research paper thumbnail of Multi-Material Topology Optimization for Crashworthiness Using Hybrid Cellular Automata

SAE Technical Paper Series

Research paper thumbnail of Design for Crashworthiness of Vehicle Structures Using an Extended Hybrid Cellular Automaton Method

SAE Technical Paper Series

Research paper thumbnail of Crashworthiness design for multiple loading conditions using dynamic weighting factors in HCA framework

13th AIAA/ISSMO Multidisciplinary Analysis Optimization Conference, 2010

Research paper thumbnail of Synthesis of a Dynamically Loaded Structure with Topology Optimization

SAE International Journal of Passenger Cars - Mechanical Systems, 2009

Research paper thumbnail of Topometry optimisation for crashworthiness design using hybrid cellular automata

International Journal of Vehicle Design, 2012

ABSTRACT An objective in crashworthiness design is to obtain energy-absorbing components. This ta... more ABSTRACT An objective in crashworthiness design is to obtain energy-absorbing components. This task has been efficiently undertaken using the Hybrid Cellular Automaton method. This method combines the CA paradigm with nonlinear, dynamic finite element analysis. Lightweight, energy-absorbing topology concepts have been obtained with this approach. This paper furthers the development of the HCA method to an efficient tool for synthesising shell structures using topometry optimisation. The objective is to find the thickness distribution that uniformly distributes the structures internal energy density. This approach addresses problems involving collisions, large displacement and material plastic hardening. The final designs meet manufacturing and performance constraints.

Research paper thumbnail of Thickness Based Topology Optimization for Crashworthiness Design Using Hybrid Cellular Automata

12th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, 2008

The hybrid cellular automaton (HCA) method has been successfully applied to non-linear transient ... more The hybrid cellular automaton (HCA) method has been successfully applied to non-linear transient topology optimization for crashworthiness design. This method utilizes the cellular automata (CA) computing paradigm and nonlinear transient finite element analyses (FEA). The ...

Research paper thumbnail of Topometry optimization of sheet metal structures for crashworthiness design using hybrid cellular automata

by Chandan K. Mozumder The objective in crashworthiness design is to generate plastically deforma... more by Chandan K. Mozumder The objective in crashworthiness design is to generate plastically deformable energy absorbing structures which can satisfy the prescribed force-displacement (FD) response. The FD behavior determines the reaction force, displacement and the internal energy that the structure should withstand. However, attempts to include this requirement in structural optimization problems remain scarce. The existing commercial optimization tools utilize models under static loading conditions because of the complexities associated with dynamic/impact loading. Due to the complexity of a crash event and the consequent time required to numerically analyze the dynamic response of the structure, classical methods (i.e., gradient-based and direct) are not well developed to solve this undertaking. This work presents an approach under the framework of the hybrid cellular automaton (HCA) method to solve the above challenge. The HCA method has been successfully applied to nonlinear tran...

Research paper thumbnail of Crashworthiness design methodology using a hybrid cellular automata algorithm for the synthesis of topologies for structures subject to nonlinear transient loading

Research paper thumbnail of Robust Design: Uncertainty Representation and Propagation

Research paper thumbnail of Topometry optimization of sheet metal structures for crashworthiness design using hybrid cellular automata

Proquest Dissertations and Theses Thesis University of Notre Dame 2010 Publication Number Aat 3441589 Isbn 9781124466712 Source Dissertation Abstracts International Volume 72 03 Section B Page 123 P, 2010

The objective in crashworthiness design is to generate plastically deformable energy absorbing st... more The objective in crashworthiness design is to generate plastically deformable energy absorbing structures which can satisfy the prescribed force-displacement (FD) response. The FD behavior determines the reaction force, displacement and the internal energy that the structure should withstand. However, attempts to include this requirement in structural optimization problems remain scarce. The existing commercial optimization tools utilize models under static loading

Research paper thumbnail of Cost and Mass Optimization for Crashworthiness Design of Shell-Based Structure Using Hybrid Cellular Automata

50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2009

Research paper thumbnail of Crashworthiness Design Methodology Using a Hybrid Cellular Automata Algorithm for the Synthesis of Topologies for Structures Subject to Nonlinear Transient Loading

Research paper thumbnail of Geomorphic assessment of habitat suitability in large rivers from satellite remote sensing: a case study from the Ganga river system, India

The ecological condition and biotic associations in a river are significantly influenced by geomo... more The ecological condition and biotic associations in a river are significantly influenced by geomorphic condition of the river, and therefore, any efforts towards river rehabilitation must address these issues to derive a long-term benefit. Such geomorphic diversity may be generated in various ways - discharge regimes and vegetation cover (driven by climatic setting), channel slope and bankline (driven by catchment morphology), sediment flux and accommodation (driven by geological settings). A pilot study in parts of the Ganga river in India using satellite remote sensing data involved analysis of (a) longitudinal form, (b) cross sectional form and (c) planform of the channel at these sites and derivation of various morphometric parameters. Twelve geomorphic parameters were been identified which influence the aquatic life along with the Land Use/ Land cover in the floodplain, planform dynamics, and channel-floodplain connectivity. For each parameter, four classes are defined as Excellent (A), Good (B), Degraded (C) and Poor (D). Both traditional GIS and the newly developed Fluvial Information System (FIS) were used to analyse the present geomorphic condition of the river for habitat suitability. An attempt was also made to suggest the desired future condition of the river from a geomorphic perspective and the necessary changes/adjustments in river form. These results when integrated with the hydraulic analysis can provide estimates of flow depth and flow volumes necessary for channel maintenance from ecological perspective.