Fracture Analysis Calculator

BS 7910 / API 579 Crack Assessment

Inputs

Asset Details

Name

Tag

Year Built

Description

Crack Geometry Definitions

Base Geometry

Crack Geometry

Crack Orientation

Crack Location

Component Dimensions

Component Thickness t in

Specify Diameter By

Input ID ID in

ID OD

Component Diameters in

Component Radii in

Crack Dimensions

Initial Crack Depth a in

Initial Crack Length 2c in

Surface to CL of Embedded Crack d1 in

Distance to Free Edge W in

Material Details

Material

Yield Stress Sy ksi

Ultimate Stress Su ksi

Sulfur Content (Low = 0.01% or less)

Toughness Model

Fracture Toughness Cutoff ksi√in

Assessment Temp T °F

Material Exemption Curve

Inputted Toughness ksi√in

Knockdown Factor

Reference Temperature T0 °F

Calculated Fracture Toughness MC_KJC_Calc ksi√in

Kmat ksi √in

Loading Definitions

Pressure P psi

Increase Factor

Membrane Bending

Based on Pressure Only

Inputted P psi

Secondary and Residual psi

Crack Geometry

PIC_CSCLE1_ID

2c: —
a: —
R_i: —
t: —

Results will appear here

Fill in the input parameters on the leftform above and click Calculate to run the fracture analysis. Values are computed server-side from run_assessment (API 579 tables via Django ORM).

Fracture Analysis Calculator

Crack Geometry

Results will appear here

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Through-Wall Stress

Master Curve Fracture Toughness

Failure Assessment Diagram