Accession Number : ADA538346


Title :   Nuclear Weapon Yield Determination through Nano Indentation of Thermally Degraded Automobile Paint


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Richards, Michael J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a538346.pdf


Report Date : Mar 2011


Pagination or Media Count : 71


Abstract : This work investigated the suitability of automotive clearcoat as a nuclear weapon yield sensor, using the change in elastic modulus as the primary metric. The AFIT Xenon Thermal Simulator (AXTS) was used to simulate a nuclear thermal pulse. The elastic modulus of the clearcoat was measured using a nano indenter. During this research the power density of the AXTS beam was increased from 44.7 to 63.7 W/cm2. The morphological steps through which automobile paint proceeds as it thermally degrades were identified and correlated with temperatures. A computer model was created and used to ensure that the paint's time-temperature response to the AXTS pulse was comparable to that of a replicate nuclear thermal pulse. Clearcoat's physical properties exhibit a low sensitivity to incident thermal energy. Variability among these properties remains essentially unchanged by exposure to the thermal pulse. A weak correlation between change in elastic modulus and exposure time was identified. A similarly weak correlation between exposure time and each of load on sample, harmonic stiffness, and hardness was also identified. It was concluded that these correlation were too weak to be used for post-detonation forensics.


Descriptors :   *YIELD(NUCLEAR EXPLOSIONS) , *NUCLEAR WEAPONS , *THERMAL RADIATION , *PAINTS , DETECTORS , EXPOSURE(GENERAL) , PHYSICAL PROPERTIES , STIFFNESS , HARMONICS , MODULUS OF ELASTICITY , THESES , SENSITIVITY , NUCLEAR RADIATION , TIME , CORRELATION , PULSES , RESPONSE , POWER , XENON , DETERMINATION , TEMPERATURE , DENSITY , SIMULATORS , THERMAL PROPERTIES , COMPUTERIZED SIMULATION


Subject Categories : Coatings, Colorants and Finishes
      Nuclear Weapons


Distribution Statement : APPROVED FOR PUBLIC RELEASE