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F E D 1 5

Software for Simple Leaf Springs

(C) Copyright 2015-2024 by HEXAGON Software, Berlin

FED15 - Software for Leaf Springs

FED15 calculates simple leaf springs from rectangular flat spring material. Leaf spring can be fixed clamped or on two bearings, and loaded by only one axial force. The load introduction position must be at the spring end if fixed clamping, and in the middle of the spring if bedded on two bearings.

For complex leaf springs, loaded by various radial and axial forces, bending moments and path load, however, we provide another software: FED10.

Material Database

Material properties of the most important flat spring materials (tensile strength, permissible shear stress and bending stress as function of material thickness, modulus of elasticity, density) are stored at the integrated material database. The dbf file may be extended and modified by the user.



FED15 also provides a pre-calculation. Enter one or two loads and deflection, and FED15 calculates dimensions of the leaf spring. Modify ratio of spring length to deflection and safety sigmaz/sigam2 to vary leaf spring dimensions.

Load-deflection diagram

FED15 calculates load-deflection line of the loaded leaf spring.


If dynamically loaded, Goodman diagram is useful to calculate fatigue strength safety and bearable load cycles of the spring.

Quick View

Load-deflection diagram together with tables of the essential spring data and results are printed on one page.


Input data and calculation results with spring travel, spring length, spring load and stresses for different spring positions may be printed, saved as text or HTML file, or exported to MS Excel via OLE interface.

Production Drawing

FED15 generates a production drawing of the leaf spring.

HEXAGON-Help System

Auxiliary text and images are available for all dialogue windows. If error messages occur, you can get description and remedy suggestion.


All drawings and diagrams can be saved as DXF or IGES file to be loaded with CAD programs.

The OLE interface lets you import/export data from/to Excel.

Export Formats

DXF, IGES, HTML, TXT, DBF, Excel, F15.

Import Formats

TXT, DBF, Excel, F15.

System Requirements

FED15 is available as 32-bit app or as 64-bit app for Windows 11, 10, 7.

Scope of Delivery

FED15 program with example applications and help images, user manual (pdf), license agreement for an indefinite period of time

Software Maintenance

FED15 is constantly being improved and updated. Registered users will be informed about news, and can get new versions at a reasonable update price.


HEXAGON gives a 24 month guarantee on full functionality of the software.

Download FED15 Demo for Windows (619 kB)

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