Ice axe supported on tape - loads and boundary conditions
Ice axe supported on tape - loads and boundary conditions
(OP)
I'm analysing ice axe according to standard. It is supported on some kind of tapes and force is also applied by this tape (fig. 1). I'm not sure what restraints to use and how to apply it. I created surfaces 15mm width (width of tapes according to standard) on half of shaft (for both supports and force)(fig. 2). What translations and rotations should I fix? On attached screen I left translation in Z direction in both supports (which is direction along shaft) and as you can see (fig. 3) max Von Misses stress is 2790 MPa (material Tensile Yield Strength is 503 MPa).
To sum up:
1.What restraints should I use?
2.Are these surfaces for supports and force appropriate for this case?
3.Should I be worried about this high stress values on the edges of supports?
To sum up:
1.What restraints should I use?
2.Are these surfaces for supports and force appropriate for this case?
3.Should I be worried about this high stress values on the edges of supports?





RE: Ice axe supported on tape - loads and boundary conditions
If I did't present my problem clearly enough just let me know.
RE: Ice axe supported on tape - loads and boundary conditions
RE: Ice axe supported on tape - loads and boundary conditions
RE: Ice axe supported on tape - loads and boundary conditions
2. Your pin is at a high stress point ONLY at the corner where a non-existant not-modeled fillet weld would attach the mount to the pin. Thus, instead of the mount-to-pin load being spread across a real-world area of real-world area between the two parts, the stress is concentrated to an infinitely small point at the corner where the two touch.
If that were your actual part, yes it would likely fail there..
RE: Ice axe supported on tape - loads and boundary conditions
RE: Ice axe supported on tape - loads and boundary conditions
Knowing very little about what the problem is, the stressed area in question seems like a stress concentration to me. Try introducing chamfers or another similar detail which would help reduce this unwanted effect. More importantly have you validated your model? Have you checked the sum of reactions equal are equal to the Force F, or what I assume are the horizontal point loads without any notation? I know these are probably very basic/patronising questions but we've all had our share of f**k ups, myself included! Have you done a simple stress analysis, e.g. distributing the force F to the two hangers/tension plates (?). You will likely need to do this anyway to design your welds.
RE: Ice axe supported on tape - loads and boundary conditions
Your model must be constrained artificially by your equations incorrectly.
RE: Ice axe supported on tape - loads and boundary conditions
RE: Ice axe supported on tape - loads and boundary conditions