T6 Skewer&Wall 6.8

T6 Skewer&Wall 6.8 - ONE-DIMENSIONAL FINITE ELEMENT...

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Unformatted text preview: ONE-DIMENSIONAL FINITE ELEMENT ANALYSIS T6-1 TUTORIAL T6 ONE-DIMENSIONAL FINITE ELEMENT ANALYSIS This tutorial is comprised of two examples, both demonstrating use of the finite element method in one-dimensional analysis with Abaqus/CAE. Example T6-1 is a solid mechanics application of a bicycle quick-release mechanism component, and Example T6-2 is a heat transfer application for a sandwich plate used in building construction. The tutorial features: A. Stress and thermal analyses: (a) Modifying element stresses to account for stress concentration factors at the root of threads (b) Specifying a convection boundary condition using /CAE's Keywords Editor B. Application of two versions of the basic two-node finite element: (a) Truss element T2D2 (b) Heat transfer element DC1D C. Load application via specification of a nonzero essential boundary condition: (a) Nodal displacement load (b) Nodal temperature load D. Running input file data checks before submitting full analysis runs. ONE-DIMENSIONAL FINITE ELEMENT ANALYSIS T6-2 Example T6-1 Stress Analysis of Bike Quick-Release Skewer The compound, cylindrical, steel rod shown ( E = 200GPa ) is known as a skewer, and it is used in a bike's front wheel quick-release mechanism. It has a cam head section on the left end and a machine thread section on the right end. When the quick-release lever is closed, the left end is displaced the throw distance of the cam, . 025 mm to the left, while the right end is anchored against the bike's fork by an adjustment nut. This places the skewer in tension, clamping the wheel hub and fork together. Skewer dimensions are given in the following table. In particular, d he is an equivalent diameter for the cam head end, and d t is the thread root diameter for which the stress concentration factor K t = 3 . applies. 1 The maximum stress in the skewer is to be determined, accounting for stress concentrations. Application of a displacement load at a boundary ( D 1 = - . 025 mm ) is featured in this example, as shown below on the FE model. Skewer dimensions ( mm ) d h d he l h d r l r d t l t 12 5.6 7 4.5 105 4 16 Quick-release skewer for bike front wheel 1 R. E. Peterson, Stress Concentration Design Factors, John Wiley & Sons, Inc., New York, 1953. Most bolt failures occur at the thread and nut interface. The stress concentration factor for standard bolt/nut proportions is as high as 3.85, but when the nut is recessed this factor is reduced to 3.0. ONE-DIMENSIONAL FINITE ELEMENT ANALYSIS T6-3 * Launch Abaqus/CAE, create a model database and re-name it Quick Release Skewer. Start\Programs\Abaqus 6.8-1\ Abaqus CAE >select Create Model Database Model\Rename\Model-1 >" Quick Release Skewer " >OK * Save the model database (the .cae extension will append automatically)....
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T6 Skewer&Wall 6.8 - ONE-DIMENSIONAL FINITE ELEMENT...

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