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UID:event-2@tuemeche.nl
DTSTAMP:20260823T220805Z
DTSTART;TZID=Europe/Amsterdam:20260902T140000
DTEND;TZID=Europe/Amsterdam:20260902T150000
SUMMARY:Predicting and Designing Failure in Soft Materials
DESCRIPTION:Speaker: dr. Miguel Angel Moreno-Mateos (Competence Center En
 gineering of Advanced Materials\,  Friedrich-Alexander-Universität Erlan
 gen-Nürnberg\, Germany)\nHost: Markus Hütter\n\nFracture toughness is u
 sually reported as a material property\, yet the same soft polymer can fa
 il in rather different ways depending on what multiphysics field is appli
 ed to it\, how its network was crosslinked\, and what touches its surface
 . This raises the following question: what actually sets failure in a sof
 t polymer\, and can we predict it well enough to design it? This talk loo
 ks at a few of those dependencies with bespoke predictive continuum mecha
 nics-based frameworks\, informed by experimental observations. In ultra-s
 oft magnetorheological elastomers of a stiffness of around 1 kPa\, remane
 nt magnetization induces compressive stresses that reduce stress concentr
 ation at the crack tip and delay propagation. Large deformation also allo
 ws less familiar fracture modes\, among them sideways cracking\, where th
 e crack deviates to run along the loading direction rather than perpendic
 ular to it in a PDMS elastomer. A continuum phase-field model links criti
 cal energy release rate and crosslink density to design fracture-tolerant
  soft heterogeneous structures. Predictions of this kind depend on the as
 sumed crack driving force and constitutive law\, which motivates approxim
 ating the J-integral at large strains through the Configurational Force M
 ethod\, and identifying data-adaptive spline-based strain-energy function
 s from experiments rather than choosing them beforehand. These threads co
 me together in soft cutting\, where failure is imposed by a blade in cont
 act. A gelatin hydrogel\, an elastomer and a meat-based material show thr
 ee different cutting regimes\, which a coupled cohesive-zone and contact 
 model helps to separate. By unifying fracture\, normal contact\, tangenti
 al friction\, and adhesion\, the framework explains mechanisms in cutting
  of soft matter.\n\nLooking ahead\, this framework provides a basis for a
  research program on soft cutting in multiphysics and heterogeneous mater
 ials. At TU/e\, I would combine continuum mechanics-based and multiscale 
 modelling with advanced mechanical characterization\, imaging\, and rheol
 ogy to connect material architecture and interfacial processes to macrosc
 opic cutting response. This direction would create opportunities for coll
 aboration across the Processing and Performance of Materials\, Mechanics 
 of Materials\, and Microsystems sections\, as well as the Department of B
 iomedical Engineering\, with applications ranging from bio-inspired mater
 ials and hydrogels to food processing and flexible electronics.
LOCATION:Vector 2.429
URL:https://tuemeche.nl/peoplepages/event.php?id=2
CATEGORIES:External Speaker / Colloquium
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