Use this engineering calculation for a transparent preliminary estimate or independent arithmetic check when geometry, materials, loads, operating conditions, and units are defined consistently.

Geometry Factor

Required number input.

Remote Stress Megapascals (MPa)

Required number input.

Crack Length Meters (m)

Required number input.

Mode-I stress-intensity factor KI=Yσ√(πa) for a supplied geometry factor; not a fracture or safety assessment. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Stress Intensity Mega Pascal Root Meter (MPa√m)

The resulting stress intensity mega pascal root meter returned as a number.

• Linear-elastic fracture relationships require valid specimen geometry, crack definition, plane-strain or plane-stress conditions, material toughness, and small-scale yielding. Plasticity, fatigue growth, residual stress, environment, and inspection uncertainty need separate assessment.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check assumptions against drawings, measurements, current material data, and the applicable design code. Apply required load combinations and safety factors, then obtain qualified review and testing for consequential designs.

• Ampacity Derated

  Adjusted current rating from a base ampacity times a supplied 0–1 derating factor; not a code sizing result.

• Bolt Shear Capacity

  Nominal single-shear force from bolt shear area times a user-supplied allowable shear stress; not a code-rated connection capacity.

• Factor Of Safety

  Nominal strength-to-applied-demand ratio for quantities expressed in the same units; does not select an acceptable design margin.