Figure 3.22. Seal of the docking device joint, a. Soyuz-Salyut; b. APDA; c. variant of seal for Apollo APDA. The seals which are used have a significant scatter of maximum compression force. For the APDAs the force of compression of the two seals with a tunnel diameter of 0.8 m is 15-30 kN (nominal value). This force may be substantially increased (to 60 kN) by increasing the protrusion of the seals due to gaps and heating. The characteristic of the force of compression depends on temperature, gaps, and the properties of the resin (see Figure 3.22). These characteristics are used to rate the lock of the docking frame. Tn order to compensate for possible radial displacements, the width of the seals increases when resin contacts resin for the APDAs (see Figure 3.22). Overall the following working conditions determine the choice of resin for the joint seal: 1) wide range of temperature during docking; 2) effect of radiation; 3) space vacuum; 4) requirement for low modulus of elasticity; 5) requirement Tor low surface adhesion.
RkJQdWJsaXNoZXIy MTU5NjU0Mg==