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Personal profile

Quote

“A sustainable society requires durable materials and material systems, in which the damage and failure mechanisms that act at the microscale are understood and controlled.”

Research profile

Johan Hoefnagels is an Associate Professor in the Eindhoven University of Technology (TU/e) group Mechanics of Materials at Mechanical Engineering, following his earlier background in applied plasma physics and advanced optical diagnostics. His current research focuses on experimental micromechanics of ‘thin films and interfaces’, by studying the systems’ micro-mechanics through integration of mechanical-microscopic characterization of underlying micro-mechanisms, such as damage and fracture, and integrate coupling of numerical simulations to experimental procedures. Topics of particular interest include delamination, ductile damage, size effects, flexible and stretchable electronics and MEMS. One of Johan’s research projects involves investigating a revolutionary mechanism to make electronics extremely stretchable and demonstrating this by means of an inflatable, in-vivo ultrasound detector, for which the first key step has been achieved: a free-standing interconnect has been designed that can be elastically stretched beyond 2000% and cyclically stretched at 1000% for over 10 million times. 

Academic background

Johan Hoefnagels obtained his MSc and PhD in Applied Physics at TU/e, with a PhD thesis on advanced optical diagnostics of surface processes during thin film deposition. After his PhD he made a dramatic switch to become assistant professor in ‘experimental micromechanics’ at the department of mechanical engineering, where he later became associate professor in the same field. He leads the ‘Multi-Scale lab’ dedicated to ‘integrated mechanical testing’, which is one of TU/e’s 10 strategic labs.

Till 2018, Johan has (co-)authored ~75 journal publications (of which ~45 times as corresponding author) and >100 refereed proceedings/book contributions. At international conferences, has given >100 presentations, of which around a third on invitation, and organized 10 symposia. He has built up >2 years of international research experience during international visits to, amongst others, IMEC (Leuven, Belgium), SUNY (Albany, USA), NIST (Gaithersburg, USA), CSM (Golden, USA), and Harvard University (Cambridge, USA). And he holds, among others, the positions of Associate Editor of scientific Journal ‘Strain’ (impact factor 1.7) and Dutch representative of the European Structural Integrity Society.

Affiliated with

Partners in (semi-)industry

  • Philips Research / Lighting / DAP / Lumileds
  • Tata
  • Océ
  • Holst Centrum
  • TNO
  • NXP
  • ASML
  • Ramlab
  • Cirrus Logic
  • Sabic
  • IMEC
  • M2i
  • and others

Education/Academic qualification

Netherlands Organisation for Scientific Research (NWO)

Elsevier

Netherlands Organisation for Scientific Research (NWO)

Netherlands Organisation for Scientific Research (NWO)

American Vacuum Society

American Vacuum Society

SUNY Stony Brook

Eindhoven University of Technology

Fingerprint Fingerprint is based on mining the text of the person's scientific documents to create an index of weighted terms, which defines the key subjects of each individual researcher.

  • 5 Similar Profiles
Delamination Engineering & Materials Science
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Plasticity Engineering & Materials Science
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MEMS Engineering & Materials Science
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Network Recent external collaboration on country level. Dive into details by clicking on the dots.

Research Output 1999 2019

2 Citations

Ferrite slip system activation investigated by uniaxial micro-tensile tests and simulations

Du, C., Maresca, F., Geers, M. G. D. & Hoefnagels, J. P. M., 1 Mar 2018, In : Acta Materialia. 146, p. 314-327 14 p.

Research output: Contribution to journalArticleAcademicpeer-review

Ferrite
Chemical activation
Plasticity
Crystals
Steel
8 Citations

Plasticity of lath martensite by sliding of substructure boundaries

Du, C., Hoefnagels, J. P. M., Vaes, R. & Geers, M. G. D., 15 Jul 2016, In : Scripta Materialia. 120, p. 37-40 4 p.

Research output: Contribution to journalArticleAcademicpeer-review

martensite
substructures
plastic properties
Martensite
Plasticity
4 Citations

Retardation of plastic instability via damage-enabled micro-strain delocalization

Hoefnagels, J. P. M., Tasan, C. C., Maresca, F., Peters, F. J. & Kouznetsova, V., 2015, In : Journal of Materials Science. 50, 21, p. 6682-6897 16 p.

Research output: Contribution to journalArticleAcademicpeer-review

Open Access
File
Steel
Martensite
Plastics
Microstructure
Ferrite
1 Citations

A small-scale, contactless, pure bending device for In-situ testing

Hoefnagels, J. P. M., Ruybalid, A. P. & Buizer, C. A., 2015, In : Experimental Mechanics. 55, 8, p. 1511-1524

Research output: Contribution to journalArticleAcademicpeer-review

Open Access
File
Bending tests
Flexible electronics
Testing
Monocrystalline silicon
Delamination
21 Citations

Processing induced size effects in plastic yielding upon miniaturisation

Janssen, P. J. M., Hoefnagels, J. P. M., de Keijser, T. H. & Geers, M. G. D., 2008, In : Journal of the Mechanics and Physics of Solids. 56, 8, p. 2687-2706

Research output: Contribution to journalArticleAcademicpeer-review

miniaturization
plastic deformation
Plastics
Processing
laser cutting

Prizes

NWO Vidi Award : Stretching the limits of stretchable electronics

Johan Hoefnagels (Recipient), 2012

Recognition: NWOVidiScientific

electronics
brain
detectors

Dorothy Hoffman Travel Award, 48th AVS Symposium, San Francisco

Johan Hoefnagels (Recipient), 2001

Recognition: OtherScholarshipsScientific

Opening plenary lecture at the BSSM annual conference.

Johan Hoefnagels (Recipient), 2016

Recognition: OtherScientific

strain measurement
lectures
plastic properties

RUBICON personal grant

Johan Hoefnagels (Recipient), 2005

Recognition: NWORubiconScientific

Student theses

An analytical-experimental approach for interface characterization using integrated DIC

Author: Baan, M., 31 Jan 2015

Supervisor: Hoefnagels, J. (Supervisor 1) & van der Sluis, O. (Supervisor 2)

Student thesis: Master

A novel pure bending test methodology for the investigation of mechanical failure behavior of flexible electronics

Author: Ruybalid, A., 31 Mar 2013

Supervisor: Hoefnagels, J. (Supervisor 1), Geers, M. (Supervisor 2), Bouten, P. C. (External person) (External coach) & van Breemen, L. (Supervisor 2)

Student thesis: Master

Cavity ringdown study of the densities and kinetics of SiHx radicals in a remote SiH4 plasma

Author: Hoefnagels, J., 31 Aug 2000

Supervisor: Kessels, W. (Supervisor 1), Boogaarts, M. (External person) (Supervisor 2), van de Sanden, M. (Supervisor 2) & Schram, D. (Supervisor 2)

Student thesis: Master

File

Characterization and modeling of interfacial adhesion for semiconductor applications covering the full range of mode mixity

Author: Thijsse, J., 30 Jun 2006

Supervisor: Geers, M. (Supervisor 1), van Dommelen, J. (Supervisor 2), Luijten, C. (Supervisor 2), Hoefnagels, J. (Supervisor 2), van der Sluis, O. (External coach) & van Driel, W. (External coach)

Student thesis: Master