Cryogenics 41, 21-25, 2001.
P. Rosenkranz¹, K. Humer¹, H.W. Weber¹, D.H. Pahr², F.G. Rammerstorfer²
¹Atomic Institute of the Austrian Universities,
²Institute of Lightweight Structures and Aerospace Engineering,
TU Wien, Vienna, Austria
In view of applications of fibre-reinforced plastics as insulating materials
for the windings of the superconducting magnets in the ITER fusion device and
because of its pulsed operation, the interlaminar shear strength (ILSS) of
these materials has to be assessed at cryogenic temperatures in the static
and in the fatigue mode.
However, none of the existing test procedures for the assessment of the
ILSS provides a pure and uniform shear stress over a sizeable region of the
Therefore, the results depend on the size of the shear area.
A scaling programme of the double lap shear test specimen geometry was
performed in the static and the fatigue mode on a glass-fibre-reinforced epoxy
at room temperature and at 77 K.
The results show an increase of the ILSS with decreasing length of the shear
area, while the shear fatigue behaviour appears to be independent of sample