Detail of GJB 5021-2001

Introduction of GJB 5021-2001

GJB 5021-2001 Temperature test methods for solid rocket motor 1 Scope 1.1 Subject Contents This standard specifies the general requirements, test preparation, test procedures and troubleshooting for temperature test of solid rocket motor (hereinafter referred to as motor). 1.2 Field of application This standard is applicable to the routine temperature test, temperature cycle test and temperature shock test of motor. The temperature test of motor parts, components and assemblies can be carried out by reference to this standard. 2 Normative references There is no provision in this clause. 3 Definitions 3.1 room temperature temperature of space in constant temperature chamber (box) 3.2 grain temperature temperature of the grain column in the motor combustion chamber. 3.3 heat preservation temperature test temperature should be reached as required 3.4 heat preservation deviation permissible fluctuation range of heat preservation temperature 3.5 heating-up (cooling-down) rate the amount of room temperature change per unit time, in the process of continuous heating or cooling, during temperature test 3.6 heat preservation time the shortest time required for motor as a whole to reach the heat preservation temperature, from the room temperature or grain column surface temperature to reach the heat preservation temperature 3.7 transfer time duration of motor has to go through from exit heat preservation environment to ignition 3.8 heat preservation thickness the radial thickness of grain column including the insulation layer and lining layer, and the composite shell can be treated as insulation layer; or the radius for solid column 3.9 under test interruption motor interruption in the process of heat preservation, due to an accident, the test temperature is lower than the lower limit of specified high temperature or normal temperature heat preservation (or higher than the upper limit of low temperature heat preservation) 3.10 over test interruption motor interruption in the process of heat preservation, due to an accident, the test temperature exceeds the upper limit of specified high temperature or normal temperature heat preservation (or lower than the lower limit of low temperature heat preservation) 3.11 routine temperature test temperature test carried out under the specified conditions of high temperature, normal temperature and low temperature 3.12 thermal cycling test temperature test in which high temperature, normal temperature and low temperature influences are alternately applied to the motor, according to the rule of slow temperature change

Contents of GJB 5021-2001

1 Scope 2 Normative references 3 Definitions 4 General requirements 5 Specific requirements Method 100 Routine temperature test 1 Purpose 2 Test preparation 3 Procedure 4 Troubleshooting 5 Preparation of test report Method 200 Temperature cycling test 1 Purpose 2 Test preparation 3 Procedure 4 Troubleshooting 5 Preparation of test report Method 300 Temperature shock test 1 Purpose 2 Test preparation 3 Procedure Annex A (Informative) Relationship table between heat preservation time and heat preservation thickness of motor with a thickness greater than 120 mm Additional explanation