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 morphologies. Cercidium floridum.

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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

Mechanical Properties of Primary Branches of 29 Desert Species

Christina Pereira


Trees and shrubs show a variety of morphologies

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 morphologies

Cercidium floridum

Pinus ponderosa


Many other tress show other forms and shapes

Many other tress show other forms and shapes

Cedrus atlantica

Fraxinus cuspitada


Mechanical properties of primary branches of 29 desert species

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

Prunus ilicifolia

Fraxinus velutina


Mechanical properties of primary branches of 29 desert species

Main Stem

Olive = Primary Branch


Mechanical properties of primary branches of 29 desert species

Main Stem

Olive = Primary Branch

Green = Secondary Branch


Mechanical properties of primary branches of 29 desert species

Main Stem

Olive = Primary Branch

Green = Secondary Branch

Orange = Tertiary Branch


Mechanical properties of primary branches of 29 desert species

Main Stem

Olive = Primary Branch

Green = Secondary Branch

Orange = Tertiary Branch

Blue = Quaternary Branch


Hypotheses

  • 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

Hypotheses


Mechanical properties bending moment m

Mechanical Properties: Bending Moment (M)


Mechanical properties of primary branches of 29 desert species

Bending Moment (M) [low]

Bending Moment (M) [intermediate]

Bending Moment (M) [high]


Mechanical properties section modulus s

Mechanical Properties: Section Modulus (S)


Materials methods measurements

  • Diameter of segment

  • Length of segment

  • Weight of segment

  • Weight of Side branches

Materials & Methods: Measurements


Mechanical properties stress

Mechanical Properties: Stress


1 mechanical stress is constant from the base to the tip of the branch desert

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


1 mechanical stress is constant from the base to the tip of the branch new york

Example 2: Pinus thunbergii

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


Table 1 properties of tree branches

Table 1: Properties of tree branches


Mechanical properties of primary branches of 29 desert species

New York

Combine the two histograms, ny and desert


1 st hypothesis bending stresses of desert species are lower than new york species

1st hypothesis: Bending Stresses of desert species are lower than New York species


Desert proportional weight vs proportional length and radius

Alex is correcting the graph

Desert: Proportional Weight vs. Proportional Length and Radius


New york proportional weight vs proportional length and radius

New York: Proportional weight vs. proportional length and radius


Second hypothesis

  • Small table of means of desert vs 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

Second hypothesis


Desert volume length vs proportional radius

Desert: Volume/Length vs. Proportional Radius


New york volume length vs proportional radius

Need to ask Alex to make graph

New York: Volume/Length vs. Proportional Radius


Mechanical properties of primary branches of 29 desert species

  • Graph of new york cum v/l

  • Are they different? If so make table

  • Is this enough?

  • If not then we do terminals vs main for desert only


Mechanical properties of primary branches of 29 desert species

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


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