Composite Repair Calculator

ISO 24817:2017 calculation and review tool

ISO 24817 engine

Import vendor design package

Select a vendor design calculation PDF to fill the calculator automatically and compare the vendor's results with StaticTools. The file is read in your browser and is not uploaded.

Design Standard

ISO Worked Example Sanity Check

Load all inputs from ISO 24817:2017 Worked Example 1 to check the calculator against the published benchmark.

Published benchmark: 14.74 mm hoop, 4.64 mm axial, 12 layers.

Composite Repair System

Qualified Composite System Template

Selected Template

SynthoGlass XT — XT-FP

Values Currently Used

SynthoGlass XT — XT-FP

Fabric

FEB-530 — Fiberglass

Resin

SPU-210 — Polyurethane

Template Ply Thickness

0.356 mm

Template Application Range

10 to 43 °C

Installation temperature 20°C is within the selected repair system's qualified application range.

Repair Classification

ISO Repair Class

Defect Type

Component Geometry

Type A Structural Method

Hoop Allowable Strain Basis

Type A structural assessment is also required for a Type B repair. For Type B, the greater of the structural and leak-sealing requirements will govern before component and restricted-landing factors are applied.

Design Conditions

Repair Design Life

years

Design Pressure

MPa

Design Temperature

°C

Installation Temperature

°C

Pressure During Repair Application

MPa

Enter 0 for depressurised application.

Load Cycles Over Design Lifeoptional

cycles

Pressure, thermal and other cycles (ISO 7.5.9.2). Above 7,000 the allowable strains are de-rated. Blank = not assessed (REVIEW).

Normal Operating Temperature (if below Td)optional

°C

ISO 7.5.3: fT1 is also checked at the lower operating temperature. The lower fT1 governs.

Pipe / Component Geometry

Outside Diameter

Original Wall Thickness

Remaining Wall Thickness

Defect Axial Length

Patch Repair — Defect Circumferential Widthoptional

Only for a patch (not fully circumferential) repair, 7.5.13.4. Blank = fully circumferential.

Available Landing Lengthoptional

Side 1. Leave blank when there is no landing restriction.

Substrate Properties

Substrate Elastic Modulus Es

MPa

Substrate Thermal Expansion αs

/°C

Substrate Allowable Stress σs

MPa

Default carbon-steel value = 138 MPa. Edit where required based on material, temperature and assessment basis.

Calculated Substrate Pressure Ps

MPa

Automatically calculated as Ps = 2 ts σs / (D − ts).

Substrate Pressure Calculation

Ps = 2 ts σs / (D − ts)

Ps = 2 × 2.54 × 138 / (406.4 − 2.54)

Ps = 1.736 MPa

Composite Repair System Properties

Values were loaded from SynthoGlass XT — XT-FP. They remain editable so the calculator can also be used for benchmark checks and controlled manual review.

Hoop Modulus Ec

MPa

Axial Modulus Ea

MPa

Poisson Ratio

Shear Modulus G

MPa

Not required for the current Type A calculation.

Hoop CTE αc

/°C

Axial CTE αa

/°C

Glass Transition Temperature Tg

°C

Individual Layer Thickness

Lap Shear Strength

MPa

Cure Scheduleoptional

Supplier cure schedule, e.g. '2 h at 60 °C' (ISO 7.5.14 output).

Hoop Strain to Failure (short-term)optional

Axial Strain to Failure (short-term)optional

Supplier Qualified Minimum Thickness (non-leaking)optional

Optional External Loads

Axial Load Fax

Shear Load Fsh

Bending Moment

kN·m

Torsional Moment

kN·m

Enter zero where the external load is not applicable. Internal-pressure end loading is handled by the ISO calculation engine.

Include an occasional (short-duration) load case. ISO 7.5.5 uses Class 1, two-year allowable strains for occasional loads. Enter the TOTAL loads acting in that case.