L
E
E
DD
W
• Geometry parameters: specimen width (W), ratio of width to hole diameter (W/D),
edge distance (E), ratio of edge distance to hole diameter (E/D), hole size (D),
thickness (t).
• Fastener parameters: hole size, clamping area, fastener type.
Fig.3 Geometry of a composite leaf spring
In this study ratio of distance to hole diameter (E/D) and ratio of width to hole diameter in
the leaf spring are changed form 1 to 4 and 4to 5 respectively for ± 45° and 0°-90° fiber
orientation. Leaf spring was fastened by M10 bolts. The load is parallel to the leaf spring
and is a symmetric with respect to the center line. The bearing strength of a hole is
represented as follows:
tD
P
..2
=
σ (1)
Where P is ultimate failure load, D is diameter of hole and t is thickness of leaf spring.
3. Production of composite leaf spring
The fiber reinforced composite material used in this study was produced in Izoreel
Composite Isolate Materials Company. E-glass fiber and epoxy resin were used to
manufacture the specimens. Glass fiber and epoxy are cured for 4 hours at 130 ° C. The
composite composite plate consist four symmetric layers [0/90]4S. At the end of
manufacturing the thickness of material was measured as 3 mm.

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Analysis of Composite Leaf Springs

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