Fail-Safe Thermal Activation Components for Insensitive Munitions

Cornerstone Research Group, Inc. (CRG), proposes the development of heat-activated pressure venting mechanisms actuated by shape memory polymers (SMP) as a means for meeting insensitive munitions (IM) requirements for ammunition containers. SMP composite materials provide the same strength as conventional composites at normal operating temperatures. However, at a threshold activation temperature, these novel materials soften to a controlled modulus of elasticity and thereby allow a predictable deformation under load. Upon cooling below the activation temperature, the material reverts to its original strength, but retains the new shape to which it deformed while soft. SMP-actuated pressure venting mechanisms coupled with conventional ammunition containers will provide failsafe venting during fast and slow cook-offs. Also, the development of these pressure venting mechanisms will offer the ability to produce non-electronic temperature monitoring systems.