Networking and interdisciplinary knowledge transfer
Alumni – Interdisciplinary Projects
© ジンジャー塚原 - Adobe Stock

Mechan­i­cal Metamaterials

Dr. Claudio Findeisen – Hector Fellow Peter Gumbsch
Dr. Muamer Kadic – Hector Fellow Martin Wegener

The postdoc Dr. Muamer Kadic and the doctoral student Claudio Findeisen, both from the Karlsruhe Insti­tute of Technol­ogy, work together in this project of the Hector Fellows Peter Gumbsch and Martin Wegener. They inves­ti­gate the proper­ties of novel metamaterials.

In contrast to classic materi­als, the proper­ties of metama­te­ri­als result from their specific microstruc­ture rather than their atomistic proper­ties. New produc­tion methods, such as direct laser writing, allow for the produc­tion of such 3D metama­te­ri­als with microstruc­tures in the range of microm­e­ters, which is impos­si­ble with standard fabri­ca­tion methods. In this collab­o­ra­tion project, the young scien­tists inves­ti­gate the design of new classes of metama­te­ri­als. They present two classes of materi­als to protect from linear vibra­tions using cloak­ing devices and to absorb energy via inner insta­bil­i­ties of micro-lattices.


An elasto-mechan­i­cal “unfee­la­bil­ity” cloak made of penta­mode metamaterials

Metama­te­r­ial-based cloaks make objects that differ from their surround­ings appear just like their surround­ings. To date, cloak­ing has been demon­strated exper­i­men­tally in many fields of research. However, cloak­ing in the appar­ently simple case of three-dimen­sional solid mechan­ics is more demand­ing.
Inspired by invis­i­ble core-shell nanopar­ti­cles in optics, the scien­tists design an approx­i­mate elasto-mechan­i­cal core-shell “unfee­la­bil­ity” cloak based on penta­mode metama­te­ri­als (see Figure 1). The result­ing three-dimen­sional polymer microstruc­tures with macro­scopic overall volume are fabri­cated by rapid dip-in direct laser writing optical litho­g­ra­phy. The researchers perform quasi-static exper­i­ments and map the displace­ment fields by autocor­re­la­tion-based analy­sis of recorded movies.

Mechanical Metamaterial

Figure 1: An elasto-mechan­i­cal unfee­la­bil­ity cloak made of pentamode

Tailored buckling micro-lattices as reusable light-weight shock absorbers

Struc­tures and materi­als absorb­ing mechan­i­cal (shock) energy commonly exploit either viscoelas­tic­ity or destruc­tive modifi­ca­tions. Based on a class of uniax­ial light-weight geomet­ri­cally nonlin­ear mechan­i­cal micro-lattices and using buckling of inner elements, they achieve either a sequence of snap-ins followed by irreversible hysteretic – yet repeat­able – self recov­ery or, alter­na­tively, multi-stabil­ity enabling program­ma­ble behav­ior. Proof-of-princi­ple exper­i­ments on three-dimen­sional polymer micro-struc­tures are done (see Figure 2).

Meta Shock Absorber

Figure 2: A shock absorber using tailored buckling micro-lattices

Dr. Claudio Findeisen

Doctoral Student

Dr. Muamer Kadic


Publi­ca­tions of this Project

  1. Kern C., Schus­ter V., Kadic M., and Wegener M., Phys. Rev. Appl., DOI: 10.1103/PhysRevApplied.7.044001 (2017).
  2. Qu J., Kadic M., Naber A., and Wegener M., Scien­tific Reports, DOI: 10.1038/srep40643 (2017).
  3. Findeisen C., Hohe J., Kadic M., and Gumbsch P., J Mech Phys Solids, DOI: 10.1016/j.jmps.2017.02.011 (2017).
  4. Kern C., Kadic M., and Wegener M., Phys. Rev. Lett., DOI: 10.1103/PhysRevLett.118.016601 (2017).
  5. Frenzel T., Findeisen C.Kadic M.Gumbsch P.Wegener M., Adv. Mater., DOI: 10.1002/adma.201600610 (2016).
  6. Schit­tny R., Niemeyer A., Mayer F., Naber A., Kadic M., and Wegener M., Laser Photon­ics Rev., DOI:10.1002/lpor.201500284 (2016).
  7. Kadic M., Bückmann T., Schit­tny R., and Wegener M., Phil. Trans. R. Soc. A, DOI: 10.1098/rsta.2014.0357 (2015).
  8. Kadic M., Schit­tny R., Bückmann T., Kern C., and Wegener M., Phys. Rev. X, DOI: 10.1103/PhysRevX.5.021030 (2015).
  9. Bückmann T., Kadic M., Schit­tny R., and Wegener M., PNAS, DOI: 10.1073/pnas.1501240112 (2015).
  10. Schit­tny R., Niemeyer A., Kadic M., Bückmann T., Naber A. and Wegener M., Optica, DOI: 10.1364/OPTICA.2.000084 (2015).
  11. Bückmann T., Kadic M., Schit­tny R., and Wegener M., Phys. Status Solidi B, DOI: 10.1002/pssb.201451698 (2015).
  12. Schit­tny R., Niemeyer A., Kadic M., Bückmann T., Naber A. and Wegener M., Optics Letters, DOI: 10.1364/OL.40.004202 (2015).
  13. Kern C., Kadic M., and Wegener M., Appl. Phys. Lett., DOI: 10.1063/1.4932046 (2015).
  14. Chris­tensen J., Kadic M., Kraft O. and Wegener M., MRS Commu­ni­ca­tions, DOI: 10.1557/mrc.2015.51 (2015).
  15. Kadic M., Bückmann T., Schit­tny R., Gumbsch P., and Wegener M., Phys. Rev. Applied, DOI: 10.1103/PhysRevApplied.2.054007 (2014).
  16. Bückmann T., Thiel M., Kadic M., Schit­tny R., and Wegener M., Nat. Commun., DOI: 10.1038/ncomms5130 (2014).
  17. Schit­tny R., Kadic M., Bückmann T. and Wegener M., Science, DOI: 10.1126/science.1254524 (2014).

Super­vised by

Prof. Dr.

Karl Leo


Hector Fellow since 2013Disziplinen Karl Leo

Prof. Dr.

Manfred Kappes

Chemistry & Physics

Hector Fellow since 2009Disziplinen Manfred Kappes

Prof. Dr.

Martin Wegener

Physics & Engineering

Disziplinen Martin WegenerHector Fellow since 2008

Prof. Dr. Dr. h.c. mult.

Eberhart Zrenner

Medicine, Biology & Engineering

Disziplinen Eberhart ZrennerHector Fellow since 2012