About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VIII
|
| Presentation Title |
Moisture-dependent Transverse Isotropic Elastic Constants of Wood S2 Secondary Cell Wall Layers Determined using Nanoindentation |
| Author(s) |
Joseph Jakes, Xavier Arzola-Villegas, Nayomi Plaza, Nathan Bechle, Rod Lakes, Donald Stone |
| On-Site Speaker (Planned) |
Joseph Jakes |
| Abstract Scope |
Moisture- and orientation-dependent mechanical properties of the S2 secondary cell wall layer (S2 layer) are needed to better understand wood mechanical properties and advance wood utilization. In this work, nanoindentation was used to assess the orientation-dependent elastic moduli and Meyer hardness in loblolly pine (Pinus taeda) S2 layers under environmental conditions of 0%, 33%, 75%, and 94% relative humidity (RH). The elastic moduli were fit to a theoretical transverse isotropic elasticity model to calculate the moisture-dependent S2 layer longitudinal elastic moduli, transverse elastic moduli, axial shear moduli, and transverse shear moduli. Moisture generally plasticizes the S2 layer. The longitudinal elastic modulus was consistently higher than the traverse elastic modulus because of the orientation of the stiff cellulose microfibrils in the S2. The axial shear modulus was consistently higher than the transverse shear modulus. The Meyer hardness had a much smaller orientation dependence than the elastic properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Biomaterials, Environmental Effects |