Wing Shear, Bending and Spar Spreadsheet
I've been wondering how to calculate the shear loading and bending moments of a canteliever wing for a while, so I decided to look it up. I found a good paper and a helpful wikipedia article. I decided to make a spreadsheet to do the calculations for me. It determines the Limit Shear and Bending moments using the Schrenk elliptical approximation, then on the next spreadsheet you can design an I-beam spar using the data. I also included several common building material strengths and had the spreadsheet determine if these materials were strong enough in bending moment for the spar at the given section points.
Its has some limitations mostly that you cannot tell what will happen when you use different materials for the spar caps and shear web. Also it doesn't determine if the spar is strong enough in shear, but it is my assumption that if it is strong enough in bending it should be strong enough in shear.
Place your aircraft information into the purple boxes. Go to the next spreadsheet and design your spar by changing the data in the purple boxes making sure the material you wish to build with can handle the stress.
I threw a little something t'gether a few years ago....
takes the planform, applies Schrenks, calculates the moment at multiple locations along the span, calculates the shear, calculates the shear web thickness based on material properties.. as well as spar cap thickness...
|Category||Thread||Thread Starter||Forum||Replies||Last Post|
|Discussion||Seagull MXS-R 91-120 wing tube bending.||Nitro2Burn||Fuel Plane Talk||37||May 08, 2015 06:30 PM|
|Question||Bending foam wings||muka||Beginner Training Area (Aircraft-Electric)||4||Feb 29, 2012 12:16 AM|
|Discussion||Engineering school- shear vrs bending moment||FlyVA||Multi Task F3X||8||Mar 01, 2011 06:13 AM|
|Discussion||Wing bending - shear flow||capricorn||Modeling Science||28||May 25, 2010 12:55 PM|
|Question||Is it a spar or is it a shear web?||BillO||Composites Fabrication||39||Nov 09, 2009 03:39 PM|