• 1698 Citations
  • 22 h-Index
1983 …2021
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Research Output 1983 2018

Filter
Article
1 Citation (Scopus)
Teaching
Students
Technical presentations
Students
Teaching
Electric network analysis
Feedback
2014
9 Citations (Scopus)

Computationally efficient multi-time-step method for partitioned time integration of highly nonlinear structural dynamics

Prakash, A., Taciroglu, E. & Hjelmstad, K., Mar 2014, In : Computers and Structures. 133, p. 51-63 13 p.

Research output: Contribution to journalArticle

Structural Dynamics
Lagrange multipliers
Structural dynamics
Time Integration
Nonlinear Dynamics
2012
1 Citation (Scopus)

On stabilized formulations for incompressible navier-stokes equations based on multi-scale decomposition formalism

Turner, D. Z., Nakshatrala, K. B. & Hjelmstad, K., Jan 1 2012, In : Mechanics of Advanced Materials and Structures. 19, 1-3, p. 216-232 17 p.

Research output: Contribution to journalArticle

Incompressible Navier-Stokes Equations
Linearization
Navier Stokes equations
Interpolation
Reynolds number
2011
14 Citations (Scopus)

A stabilized formulation for the advection-diffusion equation using the Generalized Finite Element Method

Turner, D. Z., Nakshatrala, K. B. & Hjelmstad, K., May 10 2011, In : International Journal for Numerical Methods in Fluids. 66, 1, p. 64-81 18 p.

Research output: Contribution to journalArticle

Generalized Finite Element Method
Advection-diffusion Equation
Advection
Finite element method
Formulation
27 Citations (Scopus)

The role of strain ratcheting and mesh refinement in finite element analyses of plasticity induced crack closure

Cochran, K. B., Dodds, R. H. & Hjelmstad, K., Sep 2011, In : International Journal of Fatigue. 33, 9, p. 1205-1220 16 p.

Research output: Contribution to journalArticle

Crack Closure
Crack closure
Mesh Refinement
Plasticity
Finite Element
2010
8 Citations (Scopus)

An enriched discontinuous Galerkin formulation for the coupling of non-conforming meshes

Haikal, G. & Hjelmstad, K., Jun 2010, In : Finite Elements in Analysis and Design. 46, 6, p. 496-503 8 p.

Research output: Contribution to journalArticle

Discontinuous Galerkin
Lagrange multipliers
Mesh
Formulation
Interpolation
4 Citations (Scopus)

A variational multiscale Newton-Schur approach for the incompressible Navier-Stokes equations

Turner, D. Z., Nakshatrala, K. B. & Hjelmstad, K., Jan 2010, In : International Journal for Numerical Methods in Fluids. 62, 2, p. 119-137 19 p.

Research output: Contribution to journalArticle

Incompressible Navier-Stokes Equations
Navier Stokes equations
Schur Complement
Tangent line
Stiffness matrix
2009
8 Citations (Scopus)

On dual Schur domain decomposition method for linear first-order transient problems

Nakshatrala, K. B., Prakash, A. & Hjelmstad, K., Nov 20 2009, In : Journal of Computational Physics. 228, 21, p. 7957-7985 29 p.

Research output: Contribution to journalArticle

Domain decomposition methods
continuity
decomposition
Ordinary differential equations
Differential equations
8 Citations (Scopus)

On the stability of bubble functions and a stabilized mixed finite element formulation for the Stokes problem

Turner, D. Z., Nakshatrala, K. B. & Hjelmstad, K., Aug 30 2009, In : International Journal for Numerical Methods in Fluids. 60, 12, p. 1291-1314 24 p.

Research output: Contribution to journalArticle

Bubble Function
Stabilized Finite Elements
Stokes Problem
Mixed Finite Elements
Stabilized Finite Element Method
2008
19 Citations (Scopus)

A FETI-based domain decomposition technique for time-dependent first-order systems based on a DAE approach

Nakshatrala, K. B., Hjelmstad, K. & Tortorelli, D. A., Sep 17 2008, In : International Journal for Numerical Methods in Engineering. 75, 12, p. 1385-1415 31 p.

Research output: Contribution to journalArticle

First-order System
Decomposition Techniques
Algebraic Differential Equations
Domain Decomposition
Differential equations
31 Citations (Scopus)

On finite element formulations for nearly incompressible linear elasticity

Nakshatrala, K. B., Masud, A. & Hjelmstad, K., Mar 2008, In : Computational Mechanics. 41, 4, p. 547-561 15 p.

Research output: Contribution to journalArticle

Linear Elasticity
Elasticity
Stabilization
Finite Element
Formulation
2007
17 Citations (Scopus)
Lagrange multipliers
Conservation
formulations
contact potentials
conservation
2006
44 Citations (Scopus)

A stabilized mixed finite element method for Darcy flow based on a multiscale decomposition of the solution

Nakshatrala, K. B., Turner, D. Z., Hjelmstad, K. & Masud, A., Jul 1 2006, In : Computer Methods in Applied Mechanics and Engineering. 195, 33-36, p. 4036-4049 14 p.

Research output: Contribution to journalArticle

finite element method
Decomposition
decomposition
Finite element method
formulations
4 Citations (Scopus)

Finite element approach to composite mold design based on Darcy flow with velocity clipping

Turner, D. Z., Nakshatrala, K. B. & Hjelmstad, K., Feb 2006, In : Polymer Composites. 27, 1, p. 65-70 6 p.

Research output: Contribution to journalArticle

Resins
Resin transfer molding
Flow simulation
Composite materials
Numerical methods
6 Citations (Scopus)

Three-dimensional flow visualization experiment of an RTM injection for a GFRP cuff mold

Turner, D. Z., Hjelmstad, K. & LaFave, J. M., Dec 2006, In : Composite Structures. 76, 4, p. 352-361 10 p.

Research output: Contribution to journalArticle

Plastic molds
Glass fiber reinforced plastics
Resin transfer molding
Flow visualization
Resins
2005
17 Citations (Scopus)

Determining the 3D permeability of fibrous media using the Newton method

Turner, D. Z. & Hjelmstad, K., Dec 2005, In : Composites Part B: Engineering. 36, 8, p. 609-618 10 p.

Research output: Contribution to journalArticle

Newton-Raphson method
Sensitivity analysis
Fibers
Tensors
11 Citations (Scopus)

Experimental behavior of monolithic composite cuff connections for fiber reinforced plastic box sections

Carrion, J. E., LaFave, J. M. & Hjelmstad, K., Mar 2005, In : Composite Structures. 67, 3 SPEC.ISS., p. 333-345 13 p.

Research output: Contribution to journalArticle

Fiber reinforced plastics
Composite materials
Steel
Fiber reinforced materials
Failure modes
12 Citations (Scopus)

Fabrication and testing of cuff connections for GFRP box sections

Singamsethi, S. K., LaFave, J. M. & Hjelmstad, K., Nov 2005, In : Journal of Composites for Construction. 9, 6, p. 536-544 9 p.

Research output: Contribution to journalArticle

Glass fiber reinforced plastics
Fabrication
Testing
Steel construction
Resin transfer molding
8 Citations (Scopus)

Finite element study of composite cuff connections for pultruded box sections

Carrion, J. E., Hjelmstad, K. & LaFave, J. M., Sep 2005, In : Composite Structures. 70, 2, p. 153-169 17 p.

Research output: Contribution to journalArticle

Glass fiber reinforced plastics
Stiffness
Composite materials
Fiber reinforced plastics
Mechanical properties
19 Citations (Scopus)

Variational basis of nonlinear flexibility methods for structural analysis of frames

Hjelmstad, K. & Taciroglu, E., Nov 2005, In : Journal of Engineering Mechanics. 131, 11, p. 1157-1169 13 p.

Research output: Contribution to journalArticle

Structural analysis
Interpolation
Mechanics
Kinematics
Stiffness
2004
69 Citations (Scopus)

A FETI-based multi-time-step coupling method for Newmark schemes in structural dynamics

Prakash, A. & Hjelmstad, K., Dec 7 2004, In : International Journal for Numerical Methods in Engineering. 61, 13, p. 2183-2204 22 p.

Research output: Contribution to journalArticle

Coupling Method
Structural Dynamics
Structural dynamics
Computational efficiency
Decomposition
2003
24 Citations (Scopus)
Finite Element Analysis
Euler-Bernoulli Beam
Mixed Methods
Variational Methods
Structural analysis
3 Citations (Scopus)

Rate-dependent projection operators for frictional contact constraints

Araki, Y. & Hjelmstad, K., Jun 21 2003, In : International Journal for Numerical Methods in Engineering. 57, 7, p. 923-954 32 p.

Research output: Contribution to journalArticle

Frictional Contact
Projection Operator
Regularization
Dependent
Constitutive models
56 Citations (Scopus)

Structural damage detection and assessment from modal response

Pothisiri, T. & Hjelmstad, K., Feb 2003, In : Journal of Engineering Mechanics. 129, 2, p. 135-145 11 p.

Research output: Contribution to journalArticle

Damage detection
Parameter estimation
Monte Carlo methods
Computer simulation
16 Citations (Scopus)

Three-Dimensional Finite Element Analysis of Doweled Joints for Airport Pavements

Kim, J. & Hjelmstad, K., 2003, In : Transportation Research Record. 1853, p. 100-109 10 p.

Research output: Contribution to journalArticle

Concrete slabs
Airports
Pavements
Finite element method
Wheels
2002
26 Citations (Scopus)

Mixed methods and flexibility approaches for nonlinear frame analysis

Hjelmstad, K. & Taciroglu, E., May 2002, In : Journal of Constructional Steel Research. 58, 5-8, p. 967-993 27 p.

Research output: Contribution to journalArticle

Newton-Raphson method
Structural analysis
Stiffness
8 Citations (Scopus)

Simple nonlinear model for elastic response of cohesionless granular materials

Taciroglu, E. & Hjelmstad, K., Sep 2002, In : Journal of Engineering Mechanics. 128, 9, p. 969-978 10 p.

Research output: Contribution to journalArticle

Granular materials
Computational efficiency
Constitutive models
Pavements
12 Citations (Scopus)

Strategy for finding a near-optimal measurement set for parameter estimation from modal response

Pothisiri, T. & Hjelmstad, K., Oct 10 2002, In : Journal of Sound and Vibration. 257, 1, p. 89-106 18 p.

Research output: Contribution to journalArticle

modal response
Parameter estimation
sensitivity
estimates
heuristic methods
2001
8 Citations (Scopus)

Nonlinear dynamics of a harmonically-excited inelastic inverted pendulum

Williamson, E. B. & Hjelmstad, K., Jan 2001, In : Journal of Engineering Mechanics. 127, 1, p. 52-57 6 p.

Research output: Contribution to journalArticle

Pendulums
Axial loads
Model structures
Constitutive models
Equations of motion
10 Citations (Scopus)

Optimum sensitivity-based statistical parameters estimation from modal response

Araki, Y. & Hjelmstad, K., Jun 2001, In : AIAA Journal. 39, 6, p. 1166-1174 9 p.

Research output: Contribution to journalArticle

Parameter estimation
Uncertain systems
Statistical methods
Statistics
Derivatives
2000
27 Citations (Scopus)

Analysis and implementation of resilient modulus models for granular solids

Hjelmstad, K. & Taciroglu, E., Aug 2000, In : Journal of Engineering Mechanics. 126, 8, p. 821-830 10 p.

Research output: Contribution to journalArticle

Constitutive models
Pavements
Granular materials
Constitutive equations
Computer program listings
21 Citations (Scopus)

Criteria for assessing dynamic collapse of elastoplastic structural systems

Araki, Y. & Hjelmstad, K., 2000, In : Earthquake Engineering and Structural Dynamics. 29, 8, p. 1177-1198 22 p.

Research output: Contribution to journalArticle

eigenvalue
potential energy
Potential energy
Equations of motion
unloading
1999
31 Citations (Scopus)

Experimental comparisons of connections for GFRP pultruded frames

Smith, S. J., Parsons, I. D. & Hjelmstad, K., 1999, In : Journal of Composites for Construction. 3, 1, p. 20-26 7 p.

Research output: Contribution to journalArticle

Glass fiber reinforced plastics
Stiffness
Steel
Geometry
15 Citations (Scopus)

Finite-element and simplified models of GFRP connections

Smith, S. J., Parsons, I. D. & Hjelmstad, K., Jul 1999, In : Journal of Structural Engineering. 125, 7, p. 749-756 8 p.

Research output: Contribution to journalArticle

Glass fiber reinforced plastics
Stiffness
Pultrusion
Elastic constants
Numerical models
1998
32 Citations (Scopus)

An experimental study of the behavior of connections for pultruded GFRP I-beams and rectangular tubes

Smith, S. J., Parsons, I. D. & Hjelmstad, K., Jul 1998, In : Composite Structures. 42, 3, p. 281-290 10 p.

Research output: Contribution to journalArticle

Glass fiber reinforced plastics
Stiffness
Geometry
3 Citations (Scopus)

Bounds and approximations for elastodynamic wave speeds in tetragonal media

Zuo, Q. H. & Hjelmstad, K., Apr 1998, In : Journal of the Acoustical Society of America. 103, 4, p. 1727-1733 7 p.

Research output: Contribution to journalArticle

elastodynamics
approximation
symmetry
eigenvalues
tensors
14 Citations (Scopus)

Dynamic stability of structural systems subjected to base excitation

Hjelmstad, K. & Williamson, E. B., Apr 1998, In : Engineering Structures. 20, 4-6, p. 425-432 8 p.

Research output: Contribution to journalArticle

Dynamic response
Energy dissipation
Earthquakes
4 Citations (Scopus)

Framework for modeling durability cost of structural systems

Hjelmstad, K., Lange, D. A., Parsons, I. D. & Lawrence, F. V., Sep 1998, In : Journal of Infrastructure Systems. 4, 3, p. 126-133 8 p.

Research output: Contribution to journalArticle

durability
Durability
costs
cost
modeling
7 Citations (Scopus)

Piecewise linear warping theory for multilayered elastic beams

Zuo, Q. H. & Hjelmstad, K., Apr 1998, In : Journal of Engineering Mechanics. 124, 4, p. 377-384 8 p.

Research output: Contribution to journalArticle

Shear stress
Composite materials
Cantilever beams
Eigenvalues and eigenfunctions
Elastic moduli
1997
3 Citations (Scopus)

Bounds and approximations for elastic wave speeds in cubic crystals

Zuo, Q. H. & Hjelmstad, K., Jun 1997, In : Journal of the Acoustical Society of America. 101, 6, p. 3415-3420 6 p.

Research output: Contribution to journalArticle

elastic waves
eigenvalues
approximation
tensors
crystals
2 Citations (Scopus)

Conditions for bifurcation of a cantilever beam subjected to generalized follower loads: Geometrically exact approach

Zuo, Q. H. & Hjelmstad, K., Jun 26 1997, In : Journal of Sound and Vibration. 203, 5, p. 899-902 4 p.

Research output: Contribution to journalArticle

cantilever beams
Cantilever beams
139 Citations (Scopus)

Damage detection and assessment of structures from static response

Hjelmstad, K. & Shin, S., Jun 1997, In : Journal of Engineering Mechanics. 123, 6, p. 568-576 9 p.

Research output: Contribution to journalArticle

Damage detection
Parameter estimation
Computer simulation
12 Citations (Scopus)

Elastic pavement analysis using infinite elements

Hjelmstad, K., Zuo, Q. & Kim, J., 1997, In : Transportation Research Record. 1568, p. 72-76 5 p.

Research output: Contribution to journalArticle

Pavements
Numerical analysis
Loads (forces)
Boundary conditions
Soils
1996

A new philosophy for model selection and performance estimation of data- based approximate mappings

Banan, M. R. & Hjelmstad, K., Jul 1996, In : Mathematical and Computer Modelling. 24, 1, p. 13-29 17 p.

Research output: Contribution to journalArticle

Model Selection
Sampling
Variance Function
Approximation
Performance Index
54 Citations (Scopus)

Crack identification in a cantilever beam from modal response

Hjelmstad, K. & Shin, S., Dec 19 1996, In : Journal of Sound and Vibration. 198, 5, p. 527-545 19 p.

Research output: Contribution to journalArticle

cantilever beams
modal response
Cantilever beams
cracks
damage