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Mechanical Properties of Primary Branches of 29 Desert Species

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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  1. Mechanical Properties of Primary Branches of 29 Desert Species Christina Pereira

  2. 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

  3. Many other tress show other forms and shapes Cedrus atlantica Fraxinus cuspitada

  4. To date, there has been very little research into a unifying principle of tree and shrub morphologies Prunus ilicifolia Fraxinus velutina

  5. Main Stem Olive = Primary Branch

  6. Main Stem Olive = Primary Branch Green = Secondary Branch

  7. Main Stem Olive = Primary Branch Green = Secondary Branch Orange = Tertiary Branch

  8. Main Stem Olive = Primary Branch Green = Secondary Branch Orange = Tertiary Branch Blue = Quaternary Branch

  9. 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

  10. Mechanical Properties: Bending Moment (M)

  11. Bending Moment (M) [low] Bending Moment (M) [intermediate] Bending Moment (M) [high]

  12. Mechanical Properties: Section Modulus (S)

  13. Diameter of segment • Length of segment • Weight of segment • Weight of Side branches Materials & Methods: Measurements

  14. Mechanical Properties: Stress

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

  16. Example 2: Pinus thunbergii 1. Mechanical stress is constant from the base to the tip of the branch: New York

  17. Table 1: Properties of tree branches

  18. New York Combine the two histograms, ny and desert

  19. 1st hypothesis: Bending Stresses of desert species are lower than New York species

  20. Alex is correcting the graph Desert: Proportional Weight vs. Proportional Length and Radius

  21. New York: Proportional weight vs. proportional length and radius

  22. 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

  23. Desert: Volume/Length vs. Proportional Radius

  24. Need to ask Alex to make graph New York: Volume/Length vs. Proportional Radius

  25. 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

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

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