6 / 7
Mechanical properties of composite material
Property
Value
Young’s modulus,
E
1
=
E
2
(GPa)
63
Shear modulus,
G
12
(GPa)
4.5
Poisson’s ratio,
υ
12
0.1
Density, kg/m
3
1500
Fig. 6. Self-locking effect in numerical
analysis of triangle test sample
Verification of the numerical
model was made by the analysis
of deployment of triangle unit. The
result have shown real-scale stresses
in deployment process and have
confirmed the presence of self-
locking phenomenon in numerical
analysis (Fig. 6).
Thus, the basic principles of
space all-composite bi-stable beam
truss are validated by technological
and numerical experiments. The
developed mathematical
model
is applicable for further detailed
investigation of similar type
structures.
4. Conclusions.
Further investigations plan consist of following steps:
•
Numerical analysis of folding/deployment, dimensional stability and
eigenfrequencies analysis of hexagonal unit;
•
Manufacturing of hexagonal unit, folding/deployment testing and
eigenfrequencies measurement;
•
Numerical analysis of folding/deployment, dimensional stability and
eigenfrequencies analysis of real size space truss ;
•
Manufacturing of real size space truss, folding/deployment testing
and eigenfrequencies measurement.
REFERENCES
[1] Thomson M.W. Mechanical vs. inflatable deployable structures for large apertures.
Large Space Apperture Workshop
, Keck Institute for Space Sciences, Nov. 2008.
[2] Soykasap ¨O. Deployment analysis of a self-deployable composite boom.
Composi-
te Structures
, vol. 89, iss. 3, July 2009, pp. 374–381.
[3] Hoffait S, Br¨uls O., Granville D., Cugnon F., Kerschen G. Dynamic analysis of the
self-locking phenomenon in tape-spring hinges.
Acta Astronautica
, vol. 66, iss. 7–8,
April–May 2010, pp. 1125–1132.
The original manuscript was received by the editors in 09.07.2014
54 ISSN 0236-3941. Вестник МГТУ им. Н.Э. Баумана. Сер. “Машиностроение”. 2015. № 1