Begley Research Group

Department of Mechanical and Aerospace Engineering

Courtesy appointments in Materials Science and Engineering, Electrical and Computer Engineering

 

Applied Research in Microdevices/Thin Films:

.      Biochemical sensing and detection

.      Dynamic microfluidic networks with deformable features

.      Nano-porous metals and metal/elastomer composites for sensing and actuation

.      Reliability and performance of multi-layer systems

 

Fundamental Research in Mechanics:

.      Molecular-to-continuum modeling of chemo-mechanical interactions

.      Thin film mechanics and interface reliability

.      Nano-structured materials: structure-property relationships

.      Scale-dependent plastic deformation in metals

.      Computational fracture mechanics

 

Experimental Focus:

.      Microfabrication of MEMS-type specimens for material characterization

.      Fluidic circuits, with focus on hybrid material systems

.      Nanoindentation & small-scale mechanical testing

 

Contact Information:


Matthew R. Begley

Professor, Mechanical and Aerospace Engineering

University of Virginia

 

331 MEC Building

122 EngineerŐs Way, Charlottesville, Virginia, 22904

434.243.8728

Begley@virginia.edu

 

Work in Progress:

 

In review:  Sofla, A., Seker, E., Landers, J.P. and Begley, M.R. (2008)  PDMS-glass interface adhesion energy determined via blister testing of thin films, submitted to Applied Physics Letters.

Drafted:  Leslie, D.C., Begley, M.R., Utz, M., Easley, C.J., Karlinsey, J.M., Seker, E. and Landers, J.P. (2008)  Frequency-specific flow control in microfluidic circuits with passive elastomer features.

Drafted:  Begley, M.R., Utz., Leslie, D.C., Seker, E. and Landers, J.P. (2008)  The mechanics of dynamic fluidic circuits with deformable capacitors and diodes.

Drafted:  Komaragiri, U., Agnew, S.R., Gangloff, R.P. and Begley, M.R. (2008)  Implications of SGP stress elevation for hydrogen-assisted cracking.

Working:  Huang, L., Seker, E., Utz, M., Landers, J.P. and Begley, M.R. (2008)  Oligonucleotide adsorption on gold surfaces: comparison of theory and experiment.

Working:  Huang, L., Seker, E., Utz, M., Landers, J.P., Reed, M.L. and Begley, M.R. (2008)  DNA adsorption on nano-porous gold surfaces.

 

Publications:

 

In press:

 

Komaragiri, U., Agnew, S.R., Gangloff, R.P. and Begley, M.R. (2008)  The role of macroscopic hardening and individual length-scales on crack tip stress elevation from phenomenological strain gradient plasticity, Journal of the Mechanics and Physics of Solids, to appear.

 

2006-Present:

 

Seker, E., Reed, M.L., Utz, M. and Begley, M.R. (2008) Flexible and conductive bilayer membranes of nano-porous gold and silicone: synthesis and characterization, Applied Physics Letters, 92, 154101.

Seker, E., Begley, M.R., Reed, M.L., and Utz, M. and (2008) Kinetics of capillary wetting in nano-porous films in the presence of surface evaporation, Applied Physics Letters, 92, 12138.

Seker, E., Gaskins, J.T., Zhong, J., Bart-Smith, H., Reed, M.L., Kelly, R., Zangari, G. and Begley, M.R. (2008)  The effects of annealing prior to dealloying on the mechanical properties of freestanding nanoporous gold microbeams,  Acta Materialia, 56, 324-332.

Utz, M. and Begley, M.R. (2008)  Scaling theory of adsorption-induced stresses in polymer brushes grafted onto compliant substrates, Journal of the Mechanics and Physics of Solids, 56, 801-814.

Begley, M.R. and Utz, M. (2008)  Multiscale modeling of adsorbed molecules on freestanding microfabricated structures, Journal of Applied Mechanics, 75, 021008 (8 pgs).

Seker, E., Gaskins, J.T., Zhong, J., Bart-Smith, H., Reed, M.L., Kelly, R., Zangari, G. and Begley, M.R. (2007)  The effects of post-fabrication annealing on the mechanical properties of freestanding nanoporous gold structures, Acta Materialia, 55, 4593-4602.

Begley, M.R. and Barker, N.S. (2007)  Analysis and design of kinked (bent) beam sensors, Journal of Micromechanics and Microengineering, 17, 350-357.

Savkar, A., Murphy, K.D., Lesseman, C., Mackin, T.J. and Begley, M.R. (2007)  On the use of dynamic excitation to release stiction-failed microcantilevers, Journal of Microelectromechanical Systems, 16, 163-173.

Deshmukh, D.V., Berger, E.J., Begley, M.R. and Komaragiri, U. (2007)  Shear lag based Iwan model for frictional contacts, European Journal of Mechanics A, 26, 212-224.

Ro, Y., Begley, M.R., Gangloff, R.P and Agnew, S.P. (2006)  Effects of aging on scale-dependent plasticity in aluminum alloys and implications for crack growth, Materials Science and Engineering A, 435-436, 333-342.

Seker, E., Zhong, J., Bart-Smith, H., Begley, M.R., Zangari, G., Kelly, R. and Reed, M.L.  (2006)  Mitigation of tensile failure in microfabricated nano-porous gold beams, Applied Physics Letters, 89, 133104.

Stanec, J.S., Begley, M.R. and Barker, N.S. (2006)  Mechanical properties of dehydrated photoresists for use in RF-MEMS applications, Journal of Micromechanics and Microengineering, 16, 2086-2091.

 

2000-2005:

 

Begley, M.R. (2005)  The impact of material selection and geometry on multi-functional bilayer sensors and actuators, Journal of Micromechanics and Microengineering, 15, 2379-2388.

Begley, M.R., Scott, O.N., Bart-Smith, H., Jones, M.H. and Reed, M.L. (2005)  The electro-mechanical response of elastomer membranes coated with ultra-thin metal electrodes, Journal of the Mechanics and Physics of Solids, 53, 257-2578.

Begley, M.R., Utz, M., and Komaragiri, U. (2005)  Chemo-mechanical interactions between adsorbed groups and thin elastic films, Journal of the Mechanics and Physics of Solids, 53, 2119-2140.

Begley, M.R. and Bart-Smith, H. (2005)  The electro-mechanical response of highly compliant substrates and thin stiff films with periodic cracks, International Journal of Solids and Structures, 42, 5259-5273.

Komaragiri, U., Begley, M.R. and Simmonds, J.G. (2005)  The mechanical response of freestanding circular elastic films under point and pressure loads, Journal of Applied Mechanics, 72, 203-212.

Maner, K.C., Begley, M.R. and Oliver, W. C. (2004)  Nano-mechanical testing of circular freestanding polymer films with sub-micron thickness, Acta Materialia, 52, 5451-5460.

Scott, O.N., Begley, M.R. , Komaragiri, U. and Mackin, T.J. (2004)  Indentation of freestanding circular elastomer films using spherical indenters, Acta Materialia, 52, 4877-4885.

Begley, M.R. and Mackin, T.J. (2004) Spherical indentation of freestanding circular thin films in the membrane regime, Journal of the Mechanics and Physics of Solids, 52, 2005-2023.

Vernon, P.J., Mackin, T.J. and Begley, M.R. (2004)  Fatigue testing of polymer membranes, Polymer Composites, 25, 442-450.

Begley, M.R. and Begley, C.J. (2003)  Interfacial debonding around rectangular features in multi-layer structures, Special Issue on the Mechanics of Interfaces Interface Science , 11, 319-327.

Jones, E.E., Begley, M.R. and Murphy, K.D. (2003)  Adhesion of micro-cantilevers subjected to mechanical point-loading: modeling and experiments, Journal of the Mechanics and Physics of Solids, 51, 1601-1622.

Jones, E.E., Murphy, K.D. and Begley, M.R. (2003) Mechanical measurements of adhesion in micro-cantilevers: transitions in geometry and cyclic energy changes, Special Issue on Nano- and Microscale Experiments, Experimental Mechanics, 43, 280-288.

Begley, M.R. and Ambrico, J.M. (2003) Channel cracking during thermal cycling of thin film multi-layers, Special Issue on Nanoscale Films, International Journal of Fracture, 119(4), 325-338.

Ambrico, J.M. and Begley, M.R. (2003) The role of flaw geometry in thin film delamination from two-dimensional interface flaws located along free edges, Engineering Fracture Mechanics, 70, 1721-1736.

Ambrico, J.M. and Begley, M.R. (2002)  The role of initial flaw size and plasticity in adjacent layers in channeling crack growth in thin films, Thin Solid Films, 419, 144-153.

Ambrico, J.M., Jones, E.E. and Begley, M.R. (2002)  Cracking in thin multilayers with finite-width and periodic architectures, International Journal of Solids and Structures, 39, 1443-1462.

Begley, M.R. and Ambrico, J.M. (2001)  Delamination of thin films from corner and two-dimensional edge flaws, International Journal of Fracture., 112, 205-222.

Ambrico, J.M., Begley, M.R. and Jordan, E.H. (2001) Stress and shape evolution of irregularities in oxide films on elastic-plastic substrates due to thermal cycling and film growth, Acta Materialia, 49, 1577-1588.

Begley, M.R. and Evans, A.G. (2001)  Progressive cracking of a multi-layer system upon thermal cycling, Journal of Applied Mechanics, 68, 513-520.

McNulty, J.C., Zok, F.W. and Begley, M.R. (2001) In-plane fracture resistance of a cross-ply fibrous monolith, Journal of the American Ceramic Society, 84[2], 367-375.

Ambrico, J.M. and Begley, M.R. (2001) The role of macroscopic plasticity in fretting fatigue life prediction, International Journal of Fatigue, 23(2), 121-128.

Berger, E.J., Begley, M.R. and Mahajani, M. (2000)  Structural dynamic effects on interface response-formulation and simulation under partial slipping conditions, Journal of Applied Mechanics, 67, 785-792.

Ambrico, J.M. and Begley, M.R. (2000) Plasticity in fretting contact, Journal of the Mechanics and Physics of Solids, 48 (11), 2391-2417.

Begley, M.R., Mumm, D.R. Evans, A.G. and Hutchinson, J.W. (2000) Analysis of a wedge impression test for measuring the interface toughness between films/coatings and ductile substrates, Acta Materialia, 48, 3211-3220.

 

1995-1999:

 

Begley, M.R. and Hutchinson, (1999)  Plasticity in fretting of coated substrates, Engineering Fracture Mechanics, 62, 145.

Begley, M.R., Evans, A.G. and Hutchinson, J.W. (1999)  Spherical impression of thin elastic films on elastic-plastic substrates, International Journal of Solids and Structures, 36, 2773.

Begley, M.R. and Hutchinson, J.W., (1998)  The mechanics of size-dependent indentation, Journal of the Mechanics and Physics of Solids, 46, 2049.

Begley, M.R., Cox, B.N. and McMeeking, R.M. (1998)  Time dependent crack initiation and growth in ceramic matrix composites, ASME Journal of Gas Turbines and Power, 120, 808.

Zok, F.W., Begley, M.R., Steyer, T. and Walls, D.P. (1997) Inelastic deformation of fiber composites containing bridged cracks, Mechanics of Materials, 26, 81.

Begley, M.R., McMeeking, R.M. and Cox, B.N. (1997) Creep crack growth with small-scale bridging in ceramic matrix composites, Acta Metallurgica et Materialia, 43, 3927.

Begley, M.R. (1997) Time dependent behavior of bridged cracks in CMCs: crack growth initiation, International Journal of Solids and Structures, 34, 1035.

Cox, B.N., Marshall, D.B., McMeeking, M.R. and Begley, M.R. (1996) Matrix cracking in ceramic matrix composites with creeping fibers, in IUTAM Symposium on Nonlinear Analysis of Fracture, ed. J.R. Willis, Kluwer Series on Solid Mechanics and its Applications, series ed. G.M. Gladwell (Kluwer Academic, Dordrecht, 1997) pg. 353.

Begley, M.R., Evans, A.G. and McMeeking, R.M. (1995) Creep rupture in ceramic matrix composites with creeping fibers, Journal of the Mechanics and Physics of Solids, 43, 727.

Begley, M.R., Cox, B.N. and McMeeking, R.M. (1995) Time dependent crack growth in ceramic matrix composites with creeping fibers, Acta Metallurgica et Materialia, 43, 3927.

Begley, M.R. and McMeeking, R.M. (1995) Fatigue crack growth with fiber failure in metal matrix composites, Composites Science and Technology, 53, 365.

Begley, M.R. and McMeeking, R.M. (1995) Numerical analysis of fiber bridging and fatigue crack growth in metal matrix composite materials, Materials Science and Engineering, A200, 12-21.