[SY-K1] Symposium K-1

[SY-K1] Predicting avalanches and failure: wood and paper

^○Mikko Alava, Juha Koivisto, Tero Mäkinen, Leevi Viitanen (Aalto University, Finland)

Natural and man-made structured materials like wood and paper exhibit complex response to external loading. We have demonstrated the presence of deformation avalanches in wood compression in analogy to other laboratory-scale experiments mimicking earthquakes. I will review this and the subsequent predictability of large events and discuss the relation of this to the wood microstructure, based on deformation analyses and tomographic studies [1-3]. Fiber networks - paper - exhibit a very complex creep response in, again, analogy to most other materials. The predictability of sample failure with or without an initial defect/notch depends on the presence of regularities in the rheological response, such as the localization of creep strain or the formation of a large Fracture Process Zone [4-6]. I will discuss the experimental signatures that are of relevance for predictability, and what coarse-grained models teach us.

[1] T. Mäkinen et al., Phys. Rev. Lett. 115 (055501).
[2] L. Viitanen et al., J. Stat. Mech. 053401 (2017).
[3] T. Mäkinen et al., unpublished.
[4] J. Rosti et al., Phys. Rev. Lett. 105, 100601 (2010).
[5] J. Koivisto et al. Phys. Rev. E 94, 023002 (2016).
[6] L. Viitanen et al., submitted, Physical Review Applied.