Article Figures & Data
Figures
- Figure 1.
Apparatus for static loading of tree branches. The truck battery was the power source for the equipment.
- Figure 2.
Diagram showing the parameters used to calculate the bending stress when a branch broke at the crotch. F represents the external force applied.
- Figure 3.
Diagram showing the parameters used to calculate the bending stress when a branch failed between the crotch and the loading point. F represents the external force applied.
Tables
Species Crotch angle* (degree) Specific gravity (gm/cm3) Bending stress (newtons/cm2) Moment (newton meters) Silver maple 56.7 a 0.52 a 2970 a 3009 a Norway maple 62.6 a 0.62 b 2451 a 3521 a LSD (0.05) 8.5 0.02 881 1842 Means in columns followed by the same letter are not significantly different.
↵* Mean crotch angles for this study may not be representative over the species since large limbs could not be broken with the technique employed.
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