Interesting Biomechanics

[tommer9]

Have any of you guys heard of or seen thetwisted beech in Tehidy woods near me? Well worth looking at the link! twisted beech tehidy - Google Search

[Ian H]

Thats a stunning beech Tom, v different. Some great shots of Tehidy woods, got to take a trip down and have a nosey around, it looks lovely, thanks for the link:thumbup:

[David Humphries]

good link Tom

 

 

 

 

 

.

[tommer9]

It is an intriguing tree to say the least. The twist goes right up into the tree, as if someone has just grabbed hold of it from above, and wound it round a few times. I am told there are others in the woods, but have yet to find them. There are some lovely and varied trees there, as it used to be a huge estate owned by (i think) one of the old cornish mining families. Well worth a visit if you're ever down this end of the isles.

[Tony Croft aka hamadryad]

It is an intriguing tree to say the least. The twist goes right up into the tree, as if someone has just grabbed hold of it from above, and wound it round a few times. I am told there are others in the woods, but have yet to find them. There are some lovely and varied trees there, as it used to be a huge estate owned by (i think) one of the old cornish mining families. Well worth a visit if you're ever down this end of the isles.

 

I am in cornwall 17th june for a week and will defo pay a visit.

 

thats one of the best looking old trees ive ever seen! top post tommer:thumbup1:

 

What a fantastic example of torsional optomisation, fibers aligned to cope with predominant wind loading and so relevant to the thread:thumbup:

[sean freeman]

What a fantastic example of torsional optomisation, fibers aligned to cope with predominant wind loading and so relevant to the thread

 

Often placed under the less than helpful term thigmomorphogenesis....

 

 

Here are a few pics that are representative of an unresolved discussion between some very well known Arbs over there, over here and in the US.

 

Unusual but certainly not unknown in a number of different tree species, interested in any thoughts others might have.

[Tony Croft aka hamadryad]

classic notch compressions!

[Tony Croft aka hamadryad]

In my limited understanding the 45 degree angle of these fibre buckles is indiciative of notch compression forces, buckles around a notch whos living and surounding fibres are aligned and optomised according to the design rules of nature.

 

The compression force is diverted in a 45degree angle according to the "force cone" theories/thinking tool of C. Mattheck. i think this buckling occurs in rapid grown trees competing to gain light and hieght, as is a classic for Eucs, this as I understand it requires some unbalanced investment in cellulose as aposed to lignin. This due to the over reaching of the balance between competing and succeding, strong, but only strong enough to stand but also compete. This leaves a weakness in the trees compression strengths as lignin is in lower supply hence the compression forces form these chequered patterns in the bark around the force lines of notches.

 

i hope I have explained myself in a readable and usable way! if not i will try again!

[Bundle 2]

My understanding is that fibres are failing "along" the shear plane by a slipping of fibre over fibre. Buckling suggests compression but I think this is not compression. Sorry if this what you trying to say Hama. Im not sure that I did find your explanation that easy to understand. Ill read it again old chap!!

[Tony Croft aka hamadryad]

My understanding is that fibres are failing "along" the shear plane by a slipping of fibre over fibre. Buckling suggests compression but I think this is not compression. Sorry if this what you trying to say Hama. Im not sure that I did find your explanation that easy to understand. Ill read it again old chap!!

 

yes your going to say it is shear!

 

shear going at 45 degress due to fiber compression!