Interesting Biomechanics

[daltontrees]

6 hours ago, David Humphries said:

Were the completed radial cracks predominantly in tension or compression Jules?

Neither. It was approx like this in situ...

[scotspine1]

On ‎18‎/‎03‎/‎2018 at 11:46, daltontrees said:

Nasty situation found inside bulging overextended Poplar limb at an upcurving point. Is this Poplar's answer to hazard beam failure?  I plan to make a clock face out of it, if it doesn't fall apart during drying.

 

Internal torsional twisting damage which happened in very high winds? 

 

 

 

[David Humphries]

On 3/18/2018 at 20:39, daltontrees said:

Neither. It was approx like this in situ...

Any shots of the actual branch along its length Jules?

[daltontrees]

Tim/David, I have no pics of the branch, it just looked like a standard limb removal as I was groundie for the day, and I didn't see the cracks till it was mostly in teh chipper and the heavier wood was getting ringed up. It was a fairly hefty old Poplar that had been topped severely about 15 years before, and a lower branch had gone mad, it started horizontal and stretched out for about 15 metres, curving progressively to the vertical. The section I have is about 35cm diameter, but it was in a bulge and the rest of the limb was only about 30cm diameter before and after the bulge. The bulge was in the classic hazard beam failure position, on a section about 20 degrees off hrizontal.

I've always assumed beam failures are instigated by torsion due to end wind loading, rather than by dead loads.

[David Humphries]

Heavy mast years can dead weight the end of branches leading to hazard beam

 

 

 

 

 

[daltontrees]

Good point. Oak is the king of the hazard beam. Bit of a design flaw, that.

 

Not much chance of a mast year on a Poplar though. Some candy floss if it's even fertile.

[OakStag]

Hi guys just wandered what might of caused these growths I was thinking the second two pictures could be cross sectional flattening or fibre buckling except the tree had a small canopy so not sure. The first oak had patches of bark losses could this be due to bark necrosis due to the lean of the stem?

Cheers again.

[treeseer]

Bark shedding may be due to a harmless fungus.

[Will Ingleton]

Interesting Oak in Trent Park. Enjoying that the weather's nice enough to take the time to have a good poke around looking for this sort of thing [emoji1]

[David Humphries]

2 hours ago, Will Ingleton said:

Interesting Oak in Trent Park. Enjoying that the weather's nice enough to take the time to have a good poke around looking for this sort of thing

Fine inosculation.

 

some really great trees across Trent Park