For an umbrella like deployable mesh reflector,the metal mesh exhibits properties of a thin film when tensioned on curved boundaries,pillowing effects arise and this inevitably leads to the deterioration of the surface accuracy of the reflector,and further jeopardizes the performances of the antenna.Increasing the numbers of ribs of the reflector,or applying cable net structures between adjacent ribs can effectively reduce the negatives of pillowing effects,the complexity of the reflector design,however,increases at the same time,adding mass and reducing deployment reliability.A weak stiffness composite film concept was proposed by WANG Y M and HUANG P F,which is expected to relieve the pillowing effects by conferring a degree of bending stiffness to the film.The magnitude of bending stiffness is determined mainly by the thickness of the film,resulting in increase of mass when higher bending stiffness is required.A new proposal is suggested in this paper,that the bending stiffness of the film is not tuned by changing its thickness,but its Poisson's ratio,while keeping the possibility of not increasing the mass dramatically.The relationships between the Poisson's ratio and the effects of easing pillowing effects are investigated with a circular thin plate subjects lateral concentrated force at the center,and the results are presented.
维普
万方数据