Doctoral thesis / 1998:34
TITEL
Fracture behaviour of Green Wood (Pinus Sylvestris L): a composite
materials approach

FöRFATTARE
Thuvander, Fredrik

DATUM
1998-09-22

INSTITUTION
Material- och produktionsteknik / Polymerteknik

SAMMANFATTNING
The fracture behaviour of green wood has been investigated using a
composite materials approach. Through fracture experiments on
miniature specimens, it was found that drying of wood leads to damage
not only on the macro-level but also at the scale of the cell wall.
Modelling of the hygroscopic stresses during drying revealed that this is
due to the laminated and anisotropic nature of the cell wall.

Crack growth experiments on radial cracks demonstrated the
importance of the scale of annual rings to stick-slip behaviour during
crack growth. The strain field at the crack was determined by optical
methods, calculations using the finite element method complemented
the experimental data. The importance of the stiffness difference
between earlywood and latewood was apparent.

ISSN 1402-1544 / ISRN LTU-DT--98/34--SE / NR 1998:34

Reply to post by John Paul Sanborn, on March 11, 2001 at 20:01:40:

Dear John

You tend to post stuff you have recently aquired and repeat it on the forum time after time - have you actually read it or do you really understand it? I don't think so!

Paul H.

Reply to post by Paul H, on March 11, 2001 at 20:01:40:

I usualy do, sometimes only partialy. If I find something interesting that may bear some relivance to this board I share it.

Why do you feel the need to take potshots? If you don't find them usefull, don't read them.

Reply to post by Paul H, on March 11, 2001 at 20:01:40:


Gee willikers, Paul,

I'm not sure why John should be required to read something in letting us know of its existence. Would you not accept mail that wasn't read by the mailman?

If you're expecting him to presort information, isn't that kind of lazy? As I've often said, I many times find a lot of great things on my way to somewhere else. Sometimes even in what you say...

Loosen up.

The shrinking tubs