The main objective of this project is to identify the
test methods which provide useful results for the
different types of penetrating impacts occurring in
A series of penetrating impact tests on FRP-sandwich
panels is performed using three different test methods
and the results of the test methods are compared.
The test methods used are the standardised method ISO
6603 and two non-standardised methods. The first
non-standardised method uses a pyramid-shaped impactor
instead of the cylindrical impactor used in the ISO 6603
method. In the second non-standardised method, the impact
test is performed quasi-statically using a cylindrical
Possible stages of failure occurring in FRP-sandwich
during a penetrating impact are illustrated. A
comprehensive test method should be able to provoke
various failure modes, as observed in impact failures of
actual sandwich structures.
The results obtained with the three test methods lead to
a different ranking in impact strength of the panels.
Hence, impact test results obtained with different test
methods are not even qualitatively comparable.
The pyramid-shaped impactor is able to generate clearly
more failure modes than the cylindrical impactor in the
ISO 6603 method. Therefore, it is considered to be of
more practical value for determining the impact strength
of FRP-sandwich structures.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||34|
|Publication status||Published - 1996|
|MoE publication type||Not Eligible|
- impact tests
- penetration tests
- test methods
- sandwich panels
- sandwich structures
- reinforced plastics