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<strong>pag</strong>e 26Bamboo JournalGabriele GoriStress in bamboo rods,basic concepts,and the Garrison model§ § §The purpose of this work is an attempt toprovide the basic elements of the stress inbamboo rods which are needed to interpret thediagrams one inds associated to the varioustapers.The basic concepts we will illustrate are alsovalid to understand and to use the mostcommon rod design software in the Internationalcommunity of rodmakers, i.e. RodDnaDesignLarry Tusoni and Hexrod, with awareness of thefacts.In fact, although these programmes vary inoffering the possibility to intervene in thedesign of the taper with different approaches,each with its good and bad points, they have onefundamental aspect in common.Both are based on the Everett Garrison’s calculationpattern.I presume you have all read the book “A masterguide to build a bamboo ly rod” written byHoagy CarmichaelIf not, it is time to read it: no rodmaker worthyof this name can go without knowing the workof the “master”Italian Bamboo Rodmakers Association
<strong>pag</strong>e 27Bamboo JournalThis does not mean that one must accept his“philosophy” on rodmaking completely orfollow his methods slavishly in every phase ofconstruction: it means, again, that a rodmakerworthy of this name must compare his workwith that of the Master.IMHO naturally.What is certain is that Garrison’s entire work isguided by reasoned aesthetical technical andfunctional choices, which are acceptable or notbut they give the big picture of his work that wecould deine as Garrison’s rodmaking philoso-phy-His approach to rod design is also particular: forthe irst time the design of the rod is tackledwith scientiic methods, i.e. with the analysis ofa calculation model that although it is schematicand simpliied, it represents the rod considerablywell in some aspects.In the last part of the book there are the detailedcalculations that Garrison did manually witha slide rule and the patience of Job.Today we have calculators that do that in aninstant: as I mentioned previously, both Hexrodand RodDna Design are based on the Garrisonmodel.It stands to reason that to reach this goal onemust understand how the Garrison modelworks.I will not do the numerical calculations and Iwill only use mathematical formulae if forced toand anyway they will be as simple as possible.Instead I will try to illustrate the method followedby Garrison in a qualitative way: I hope totransmit those basically simple, indispensableconcepts to use the RodDna Design programmewith more awareness.Unfortunately some basic concepts need to beclariied otherwise we cannot understand theterms used in Garrison’s model (or any other).First of all we must explain stress because asyou know the Garrison method is based on thestress graph.The stress or “internal tensional state” is thestrain that is created in the material of which abody is made when it is stimulated by an externalaction.For example let’s look at the case of a pillar (inthe drawing it has the shape of a hexagon)stimulated by a vertical axial load N.Italian Bamboo Rodmakers Association
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