search query: @keyword mechanical properties / total: 12
reference: 2 / 12
« previous | next »
Author:Hernandez Estrada, Albert
Title:Influence of anatomy on transverse compressive mechanical properties of Norway spruce
Publication type:Master's thesis
Publication year:2011
Pages:100 + [14]      Language:   eng
Department/School:Puunjalostustekniikan laitos
Main subject:Puutekniikka   (Puu-28)
Supervisor:Hughes, Mark
Instructor:Tukiainen, Pekka
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark Aalto  2317   | Archive
Keywords:mechanical properties
mesoscale
compression
Norway spruce
Young's modulus
size effect
Abstract (eng): Wood is an anisotropic material which exhibits different mechanical properties depending on the direction in which it is tested.
In the longitudinal direction, Young's modulus is around 10 times higher than in the transverse one, but also different orientations in the transverse direction exhibit different mechanical properties.

In this current research, two different sizes of Norway spruce specimens have been tested in compression in the transverse direction, radially and tangentially, to find how morphology affects the mechanical properties and how these properties differ from one direction to another.
The important role of rays acting as beams keeping the integrity of the structure, as well as the differences between earlywood and latewood under external strains, has been elucidated.

At the same time, some techniques have been developed in the production of small specimens, razor blade cutting being the most important one, being able to produce a flat surface and minimizing the damage in the cell walls, allowing the further possibility of imaging the surface at the mesoscale level with the microscope to obtain images of the cell's deformation.

As a consequence of testing different specimen sizes, an unexpected effect associated with the specimen size arose that affected the values of mechanical properties.
It was found that this effect was previously called size effect, and it is not only affecting wood but it is common in other cellular materials such aluminium or polyurethane foams, ceramics or sea ice.
ED:2011-12-21
INSSI record number: 43638
+ add basket
« previous | next »
INSSI