| 摘要 |
A solid propellant grain is held within a rocket motor case in a substantially stress-free manner. The grain is not bonded to the case itself but is bonded to a sleeve which has lateral protrusions or convolutions on its exterior which fit loosely and unattached into similar convolutions in a sleeve bonded to the interior of the case. The sleeve bonded to the propellant is made of a polymer having substantiallythe same elastomeric qualities as the propellant itself so that stresses are not created in the propellant at the bond. Physical shock or distortion of the propellant and thermal expansion or contraction of it create changes in dimension which are absorbed principally by the clearance gap between the convoluted surfaces of the sleeves and therefore substantially no cracking stresses are produced in the propellant itself.
|
