Factor of SafetyWhat the number means, what it hides, and what it must be stated against.Mechanical EngineeringFactor of safety is a strength divided by the stressyou expect, and it is meaningless without both.n = strength ÷ working stressSy = 250, σ = 100 MPan = 2.5 on yieldNot on fracture.Known load, tested steeln of 1.5 to 2Well characterised.Uncertain load, brittlen of 3 to 4 or moreOr use tensile.THE COMMON MISTAKE✗ Quoting a factor without saying against what✓ Name the strength you divided byFactors against yield, tensile, buckling and fatigue are four different numbers forthe same part. A bare number is not a design statement.Codes and standards set the required factor in practice, and theyusually set load factors too. Educational reference.Factor of Safetylearnposters.com
Factor of Safety — printable engineering wall chart from LearnPosters. Free vector PDF, US Letter and A4.

What’s on the Factor of Safety poster

The rule, 3 worked examples, and the mistake everyone makes.

Codes and standards set the required factor in practice, and they usually set load factors too. Educational reference.

Questions about the Factor of Safety poster

What’s on the Factor of Safety poster?
The rule, 3 worked examples, and the mistake everyone makes. Factor of safety is a strength divided by the stress you expect, and it is meaningles…; n = strength ÷ working stress; Sy = 250, σ = 100 MPa = n = 2.5 on yield; Known load, tested steel = n of 1.5 to 2; Uncertain load, brittle = n of 3 to 4 or more; Common mistake: Quoting a factor without saying against what → Name the strength you…. Codes and standards set the required factor in practice, and they usually set load factors too. Educational reference.
Who is the Factor of Safety poster for?
Factor of Safety belongs to the Mechanical Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning machine design can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the Factor of Safety poster?
Every strength check, and every time someone quotes a bare safety factor. A wall chart earns its place by being glanceable from where the work is happening, so Factor of Safety belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
What other posters go with Factor of Safety?
Bearing Life, Choosing a Bearing and Belt or Chain? sit alongside Factor of Safety in the Mechanical Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Bearing LifeChoosing a BearingBelt or Chain?
Is the Factor of Safety poster free to download and print?
Yes. Factor of Safety downloads as a free PDF with no account, no email and no watermark, like everything else in the Mechanical Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Factor of Safety poster print at?
Factor of Safety is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Factor of Safety loses nothing.Printing guide

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