User-entered allowable

Stress safety margin

Inputs

Applied stress magnitudeσappPositive magnitude from one separately validated load case.

Allowable stressσallowUser-entered allowable on the same stress basis as the applied magnitude.

Results

Allowable-to-applied factorn

2.0833

Margin of safetyMS

1.0833

UtilizationU

Factor = σallow/σapp; margin = factor − 1; utilization = σapp/σallow

A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.

Calculation snapshot

Stress safety margin

Formula version 1.0.0

Conditions

Applied stress magnitude	120
Allowable stress	250

Calculated response

Allowable-to-applied factor	2.0833 1
Margin of safety	1.0833 1
Utilization	48 %

Method

Factor = σallow/σapp · margin = factor − 1 · utilization = σapp/σallow

Source

SAND2008-0371, Guideline for Bolted Joint Design and Analysis (Sandia):

Boundaries

Like-for-like stress basis
User-entered allowable
One stated load case
No code judgement

This printout is a record of displayed inputs and deterministic formula output. It is not an approval, certification, or engineering conclusion.

Nearby: Unit converter · Mass & density

Method

Formula, when it applies, and when it does not

Compare one applied stress magnitude against one allowable stress and show the resulting factor and margin without asserting material, code, or load-case validity.

Factor = σallow/σapp; margin = factor − 1; utilization = σapp/σallow

When

Like-for-like stress basis
One stated load case
No code judgement

Don’t

This is arithmetic on two user-entered like-for-like stress magnitudes. It does not establish an allowable, determine a governing load case, apply a design code, account for uncertainty or fatigue, or determine whether the resulting margin is acceptable.

SAND2008-0371, Guideline for Bolted Joint Design and Analysis (Sandia)