Nondestructive Testing of Solid-propellant Rocket Motors


Book Description

Methods are given for nondestructively inspecting rocket motor cases, nozzles, and motor-case insulation. The motor cases may be fabricated from steel, titanium, or glass-reinforced plastics and made by welding or wrapping processes. In some designs, the nozzle consists of tungsten inserts fitted in graphite heat-sink backup rings with a molybdenum sleeve shrunk over the graphite ring. The inside insulation is generally a rubber-base substance adhered to the motor case. (Author).







Planning a Nondestructive Testing Program for Solid Propellant Rocket Motors


Book Description

Nondestructive testing is mandatory to assure the quality, reliability, and motor performance required by the solid propellant rocket motor industry. The motor performance desired demands minimum inert component weight and, therefore, precludes the luxury of wide material and design safety margins. Established techniques have been used where applicable, and new and advanced techniques have been evolved or modified for use. Extensive consideration and effort are being expended to develop automation and instrumentation for the readout and evaluation process so as to minimize subjective and qualitative interpretation of the test by providing objective and quantitative interpretation. Standards for evaluation of the test method used and th eitem produced are necessarily being upgraded. This correlation is found through direct measurement of specific properties, through experience based on past performance, or from destructive tests.













DEVELOPMENT OF NONDESTRUCTIVE TESTING TECHNIQUES FOR LARGE SOLID-PROPELLANT ROCKET MOTORS.


Book Description

A study way made to evaluate the capabilities of nondestructive test methods best suited to the detection of critical defects in large solid- propellant motors. A critical defect may be defined as an imperfection in a motor which will impair the success of an assigned mission. Two general types of defects are classified as critical regardless of their size. These are a case- insulation unbond exposed to propellant gases, and any defect which tends to propagate without limit. Analytical studies suggested that certain configurations of propellant-liner unbonds and cracks may propagate. Experimental studies conducted with a PBAN propellant showed no evidence of defect propagation.