R-067 Entry Point Screening

1
Hanagud 1
Active Control of Buffet-Induced Vibrations

• Introduction
• A class of energetic materials known as reactive
  metal mixture (RMP) contain metal as the fuel and
  metal oxide as the oxidant (like Al/Fe2O3).
• If RMP is synthesized with reduced grain size
  approaching 10 to 100 nanometers, we can bring
  the fuel and oxidant into close proximity. This
  will enhance energetic characteristics like burn
  rates and energy release rate. At the same time,
  nano grain size will also improve structural
  strength and result in a dual functional material
  with both structural strength and explosive
  power.
• Objectives
• To develop analytical, experimental,
  computational, and tools for the optimal design
  and synthesis of nano-structured multifunctional,
  reactive materials that simultaneously provide
  enhanced explosive power and structural strength.

A Potential DOD Application Efficient and Small
Size Target Penetration Missiles

• Target Penetration Devices or Missiles (TPM) can
  destroy underground facilities by penetration
  through rock or concrete and then explode.
  Usually, high explosives (HE) are enclosed in a
  steel kinetic energy penetrator whose weight is
  usually many times HE.
• To increase the payload and thus increase
  explosive power, we can replace the steel casing
  by multifunctional energetic structural materials
  that has strength to penetrate through the
  target, and then react both HE and metal/metal
  oxide energetic composites.
• The additional strength is achieved through
  nanostructuring the energetic material and
  adding strength reinforcement.

2
Approach to the Proposed Basic Research
Hanagud 2

• Develop a framework of oxidants and fuels to
  synthesize multifunctional energetic structural
  materials (MESM). Synthesize reactive metal/oxide
  particle (RMP) mixtures by two different novel
  sol-gel processes and a traditional mixing
  process.

• Add additional strength reinforcement (RRMP) as
  found necessary at nano, micro and macro levels.
  Develop functionally graded materials for
  transition

between RRMP and conventional structural
materials. Develop methods to produce desired
structural shapes of RMP and RRMP.

• Develop constitutive equations, reaction
  characteristics, stress-induced reaction criteria
  by using (a) ab initio procedures and molecular
  dynamics, (b) thermodynamic constitutive equation
  modeling procedure and (c) novel method of
  bridging length and time scales.
• Establish failure theories and explosive reaction
  initiation criteria.
• Tests to quantitatively characterize MESMs
  parameters of constitutive equations, mechanical
  failure criteria, reaction initiation criteria,
  reaction kinetics/process and reaction products.
• Design model target penetrating missiles (TPMs)
  with varying amounts of energetic structural
  materials or reinforced energetic structural
  materials.
• Evaluate the design, and perform mechanical test
  on coupon samples (with and without fuel).
  Computational evaluation of the performance of
  designed TPM.
• Impact and penetration tests of designed TPMs.
• Post-test analysis of TPM without the fuel
  component (inert) microscopic analysis of
  sections of post-test penetrators.
• Prediction of the performance of MESMs for other
  DOD applications.

3
Hanagud 3

• Research Team
• MURI Participants Georgia Tech S. Hanagud (PI),
  D. McDowell, N. Thadhani, R. Tannenbaum, F.
  Mistree, A. Sexana, M. Zhou, M. Li, and J. Allen
  VPI R. Batra Univ of Florida L. Vu-Qouc
  Florida State Univ A. Stiegman Univ of
  Maryland W. Fourney and J. Cardenas-Garcia
• Matching Fund Participants MURI participants
  will work in cooperation with AFRL scientists W.
  Wilson, M. Hughes, O. Toness, M. Dilmore,
  R.Armstrong and Krammer and Lawrence Livermore
  Laboratory scientists J. Satcher,A. Gash.
• Interactions through a secure website video
  conferences
• Task Interactions

Critical experiments for Strength, Constitutive
Equations, Reaction Initiation, and Reaction
Process on RMP and RRMP
Ab Initio and Molecular Dynamics Modeling,
Constitutive Equations, Bridging Scales for
Multifunctional ESMs
Material Tests and Model Validation Tests
Synthesis of Multifunctional Energetic
Structural Materials
Reinforcement Concepts
Design of Model TPM Numerical Simulations of
Designed TPMs
Optimization for Multifunctionality Reactivity
in RMP RRMP
Fracture Characteristics and Improvement of
Fracture Toughness
Tests of TPMs without Fuels
Predictive Equations, Procedures for Munition
Designs, Procedure of ESMs
Tests of TPMs with Fuels
Analysis of Recovered Penetrators
4
Hanagud 4
Expected Results

• A framework for the selection/design of reactive
  metal/metal oxide mixture (RMPs) that can
  facilitate manufacturing different
  multi-functional energetic structural materials
• Synthesis procedures of selected RMP
• Methods of reinforcing RMP to produce
  multifunctional energetic structural material
  (MESM) for strength and energetic characteristics
• Strength and energetic characteristics of MESM
• Establishment of the link between MESM and their
  use in DOD applications, including missiles
• Method of design of a model target penetrating
  missile (TPM) using MESM to increase the energy
  released from the current levels
• Procedure for the analysis of the model TPM, test
  article, testing and validation for
  impact/penetration
• Discussion of other potential DOD applications
• Training of graduate students, including doctoral
  students
• Training of minority students
• Building an infrastructure for future research.