Cross-disciplinary Mechanics

Mechanical models in combination with models from for example statistical physics, chemistry or physiology, are crucial in understanding many cross-disciplinary phenomena. I am developing such models in the fields of biomechanics, mechanics of soft materials and biomaterials. I am also interested in applied problems including papermaking.

To truly understand how the properties of materials develop, it is necessary to investigate the hierarchy of structures within the material. Tissues of the human body, for instance, consists of a matrix of fibrous biopolymers (Fig. 1) with embedded cells, which collectively form the organs, vascular systems and the structural elements that form the human body. Similarly, many emerging materials such as nanocellulose paper (Fig. 2), comprise nanoparticles that form a hierarchical structure, sometimes within a polymer matrix. Ongoing research concern how fibrous nanostructures affects the elasticity of materials.

The forming process of hierarchical materials is critical to the resulting macroscopic material properties. Detailed control of the forming process and knowledge about the optimal microstructures is necessary to purposefully enhance the material properties. One of my ambitions is to enhance the properties of biobased, renewable materials (Fig. 3) to make them competitive with petroleum-based products.

Visualisation of my research
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Fig. 1: Model of a reconstituted, isotropic collagen network
Fig. 1: Model of a reconstituted, isotropic collagen network. 
Fig. 2: SEM micrograph of through-thickness structure of nanocellulose paper.
Fig. 2: SEM micrograph of through-thickness structure of nanocellulose paper. 
Fig. 3: Resulting network from forming simulation of cellulose fiber-based paper.
Fig. 3: Resulting network from forming simulation of cellulose fiber-based paper.

Summary
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Academic merits

  • MSc Engineering Physics, Chalmers University of Technology, Sweden 2001
  • PhD Chemical Engineering, Mid Sweden University, Sweden 2008

Research interests

  • Emerging cellulose materials
  • Fiber suspensions and papermaking 
  • Thermally-activated fracture in soft materials 
  • Biopolymer network mechanics 
  • Growth and remodeling of soft tissue

Find Stefan's external publications here:

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Stefan's latest publications at LiU
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2020