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4
Parameter studies on thick-walled multilayered composite plates
with cut-outs
4.1 Comparison with classical laminate theory
In the first parameter study presented here the effect of a first-order shear
deformation theory (SDT1) in comparison to the classical laminate theory
(CLT) is studied. As exemplary results, the strain distribution on the laminate top surface at the edge of the notch for a [±4510 ]s GF/PP multilayered
composite plate with a circular cut-out (diameter ∅ = 30 mm) is shown. The
plate was loaded under unidirectional tension (membrane load, Fig. 7(a)) and
under plate-bending load (Fig. 7(b))
(b) bending load Mx = 100 Nm/m
(a) membrane load Nx = 10 N/m
Fig. 7. Strains on laminate top surface
In the case of pure membrane load and the symmetric multilayered composite,
no differences between the results using the CLT and the SDT1 can be observed, as expected (see Fig. 7(a)). Naturally, the effects of the shear deformation (Fig. 7(b)) are only relevant in cases where shear force initiated bending
effects occur, either caused by the material (non-symmetrical laminates) or
caused by the loads(bending load). In these cases a great difference between
the results calculated using the CLT or SDT1, respectively, can be observed.
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