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Mechanical Properties of Primary Branches of 29 Desert SpeciesPowerPoint Presentation

Mechanical Properties of Primary Branches of 29 Desert Species

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Mechanical Properties of Primary Branches of 29 Desert Species

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### Mechanical Properties of Primary Branches of 29 Desert Species

Christina Pereira

Some are tall and slender with main stem and short primary branches

Some are short and wide with less dominant stem and very long branches

Trees and shrubs show a variety of morphologiesCercidium floridum

Pinus ponderosa

To date, there has been very little research into a unifying principle of tree and shrub morphologies

Prunus ilicifolia

Fraxinus velutina

Main Stem principle of tree and shrub morphologies

Olive = Primary Branch

Main Stem principle of tree and shrub morphologies

Olive = Primary Branch

Green = Secondary Branch

Orange = Tertiary Branch

Main Stem principle of tree and shrub morphologies

Olive = Primary Branch

Green = Secondary Branch

Orange = Tertiary Branch

Blue = Quaternary Branch

- Mechanical stress is constant from the base to the tip of the branch.
2. Branches of Desert species will have less mechanical stress than species from New York

3. The addition of secondary branches is a reiterative process in the mechanical structure of tree branches.

4. Mechanical stresses of primary branches are constant among tree species

Mechanical Properties: Bending Moment (M) the branch.

Mechanical Properties: Section Modulus (S) the branch.

- Diameter of segment the branch.
- Length of segment
- Weight of segment
- Weight of Side branches

Mechanical Properties: Stress the branch.

1. Mechanical stress is constant from the base to the tip of the branch: Desert

Example 2: Pinus thunbergii the branch: Desert

1. Mechanical stress is constant from the base to the tip of the branch: New YorkTable 1: Properties of tree branches the branch: Desert

New York the branch: Desert

Combine the two histograms, ny and desert

1 the branch: Desertst hypothesis: Bending Stresses of desert species are lower than New York species

Alex is correcting the graph the branch: Desert

Desert: Proportional Weight vs. Proportional Length and Radius- Small table of means of desert radiusvs new york slopes
- Desert = 0.048 slope
- New york = 0.072 slope
- T test probability = 0.0072
- Conclusion: they are different
- Thus the main reason why have lower stress values have less weight near the tips

Desert: radiusVolume/Length vs. Proportional Radius

Need to ask Alex to make graph radius

New York: Volume/Length vs. Proportional Radius- Graph of new york cum v/l radius
- Are they different? If so make table
- Is this enough?
- If not then we do terminals vs main for desert only

3. The addition of secondary branches is a reiterative process in the mechanical structure of tree branches.