1.
STRESS ANALYSIS OF A BICYCLE SPANNER
Aim :
To analyse the stress distribution of a bicycle spanner.
Problem Description :
The bicycle spanner is as shown in figure below made of steel with a modulus of elasticity E =
200GPa and a Poisson’s ratio ν = 0.32. The spanner is 3 mm thick. Determine the von - mises
stress under the given distributed load and boundary conditions.
I . Starting :
Click → start → ANSYS → ANSYS product launcher:
Launch → ANSYS Multiphysics
File Management → browse the directory for saving and retrieving the files.
II. Preprocessing:
Preference → tick → structural → select ‘h’ method → ok
Title: Utility menu → file change title → spanner → ok
Utility menu → plot → replot.
Elements: Main menu → preprocessor → element type → add/edit/delete → add →
structural mass → solid → Quad 8 node (Plane 82) → ok → options → select plane
stress w/thk. in K3 option → ok → close.
Real constants: Main menu → preprocessor → Real constants → add/edit/delete → add
→ ok → enter the thickness as 3 → ok → close.
Material Properties: Main menu → preprocessor→ Material props → material models
→ structural → linear → elastic → isotropic → Young’s modulus (EX = 200e3) and
Poissons ratio (PRXY = 0.32) → ok.
Modeling: Main menu → preprocessor → modeling → create → areas → rectangle →
by centre & corner → enter 0,0,1000,150 → ok
Main menu → preprocessor → modeling → create → areas → solid circle → enter -500,
0,125 → ok.
Main menu → preprocessor → modeling → create → areas → solid circle → enter
0,0,125 → ok
Main menu → preprocessor → modeling → create → areas → solid circle → enter
500,0,125 → ok
Main menu → preprocessor → modeling → operate→ Boolean → add → areas → pick
all → ok
Main menu → preprocessor → modeling → create → areas → polygon → hexagon →
enter 0,0,90,blank space → apply → - 500,0,70, blank → apply → 500,0,70, blank → ok
Main menu → preprocessor → modeling → operate → Boolean → subtract → area →
select → base area → ok → select subtracting area (all hexagons) → ok.
Utility menu → plot ctrls → hard copy → to file → jpeg→save to : spanner.jpg → ok
Main menu → preprocessor →Meshing → size cntrl → manual size → global → size →
enter size as 5 →ok.
Main menu → preprocessor → meshing → mesh tool → mesh → areas → pick all → ok.
Utility menu → plot ctrls → hard copy → to file → jpeg→save to: spanner mesh→ ok.
Boundary conditions and Loads: Utility menu → plot → keypoints → keypoints → ok.
Utility points → select → entites → keypoints → by num/pick → ok → select left
hexagon keypoints → ok
Utility points → plot → keypoints → keypoints → ok
Main menu → solution → define loads → apply → structural → displacement → on
keypoints → pick all → select all DOF → ok
Utility menu → select → everything
Utility menu → plot → multiplot
Main menu → solution → define loads → apply → structural → pressure → on lines →
select by cursor top right horizontal line → ok → enter pres = 5 → ok
Utility menu → plot ctrls → hard copy → to file → jpeg → save to : spanner load.jpg →
ok
III. Solution
Main menu → solution → solve → current LS.
IV. Post processor
Gen. Post processor → plot results → contour plots → nodal solu. → stress → von mises
→ ok
Utility menu → plot ctrls → hard copy → to file → jpeg → save to : spanner stress
result.jpg → ok
Utility menu → file → save as → spanner.db → ok
Utility menu → file → write db log file → spanner.lgw → ok.
