Addressing nanomechanical testing irregularities in molecular organic crystals to determine mechanical properties
Source abstract
Abstract
Molecular crystals often form noncubic crystal structures which can lead to anisotropic or limited slip conditions that lead to the inability to accommodate arbitrary plastic deformation. In certain molecular crystal systems, such as diaminoazoxyfurazan (DAAF), limited slip conditions are present. Indentations on DAAF produced an irregular (non-parabolic) “mechanical fingerprint”, while similarly structured molecular crystals hexanitrohexaazaisowurtzitane (CL-20), azodiaminoazoxyfurazan (ADAAF), and 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) behaved predictably. Indentation impressions on DAAF were often non-conforming to the indenter tip and produced a higher-than-expected coefficient of variation in calculated properties. These behaviors are not identified in other materials with chemical and crystallographic similarities to DAAF, therefore, non-conformal behavior is not governed by these attributes alone. However, once this novel mechanical fingerprint was identified, extracting material properties from nanoindentation was still possible. The elastic modulus and hardness of DAAF is 14.3 and 0.67 GPa, respectively; CL-20 has a modulus and hardness of 25.5 and 1.18 GPa, respectively.Graphical abstract
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Metal and Thin Film Mechanics · Force Microscopy Techniques and Applications · Energetic Materials and Combustion
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (31)
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