Mechanistic study of microstructural deformation and stress in steam-exploded softwood
Artikel i vetenskaplig tidskrift, 2017

Steam explosion pretreatment results in the formation of microcracks in the cell walls of wood. In the present study, steam explosion experiments were performed and structural changes in Norway spruce were identified using scanning electron microscopy. The cellular structure of the softwood spruce was simulated using the finite element method, and the effects of pressure generated during the steam explosion pretreatment on the deformation of the cells were investigated. The simulated model included earlywood, latewood, and ray cells. The effects of bordered and cross-field pits on the stresses in the cell wall were studied as well. Many similarities were observed between the microcracks in the steam-exploded wood and the high-stress regions predicted by the model. The experimental and simulation results showed that the radial cell walls in the earlywood cells experienced major deformation. The presence of the pits created stress localization and facilitated the formation of microcracks in the cell walls.

TRACHEIDS

CELLULOSE

ENZYMATIC-HYDROLYSIS

NORWAY SPRUCE

FAILURE

EXPLOSION

P235

1989

ULTRASTRUCTURE

JUL

FRANCE

NANTES

V32

TRANSVERSE

SUB-ALPINE FIR

RUCTURE-BIODEGRADATION-UTILISATION

WOOD

Författare

Muhammad Muzamal

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk miljövetenskap

Erik Kristofer Gamstedt

Uppsala universitet

Anders Rasmuson

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk miljövetenskap

Wood Science and Technology

0043-7719 (ISSN) 1432-5225 (eISSN)

Vol. 51 3 447-462

Ämneskategorier

Materialteknik

DOI

10.1007/s00226-017-0896-7

Mer information

Senast uppdaterat

2018-05-02