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>ARL-TR-8629 - A Mechanochemistry-Based Technique for Early Material Damage Detection in High Strain Rate Processes | U.S. Army Research Laboratory
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ARL-TR-8629 - A Mechanochemistry-Based Technique for Early Material Damage Detection in High Strain Rate Processes | U.S. Army Research Laboratory
It is often desired to detect damage at the sub-continuum level before continuum-level damage is observed. The burgeoning field of polymer mechanochemistry promises development of novel materials that would report sub-continuum-level damage if a critical stress or strain level is exceeded. In addition, a long-standing challenge for multi-scale modeling validation has been the generation of experimental data to link molecular-level damage to macroscopic material behavior at high rate. Using mechanophore-embedded silicone elastomer samples, for the first time ever, molecular-level bond breakage is captured visually during standard high-rate material characterization experiments, prior to the onset of macroscopic damage. A brief description of synthesized mechanophores, methods of embedding into the silicone elastomer, and the method to determine the critical strain of mechanophore activation (molecular-level bond breakage) is included. The critical strain and critical stress values are determined for the onset of molecular-level bond breakage. Constitutive models enhanced with the method presented in this report can potentially be used for validation of multi-scale material failure computational model development efforts to simulate ballistic impact events. The results reported herein contribute to the investigations of mechanophore-embedded materials for enhanced stress assessment and for the development of mechanophore-based adaptive/multifunctional protection materials.
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