Influence of Skin-Core Stiffness Mismatch on the Static and Dynamic Mechanical Performance of CFRP- and QFRP-Skinned Aramid Honeycomb Sandwich Structures.

This work gives engineers the tools to analyze how a mismatch in stiffness between the skins and the core changes the static and dynamic behavior of sandwich structures. The focus is on composite sandwich panels that use Carbon‑Fiber‑Reinforced Polymer (CFRP) or Quartz‑Fiber‑Reinforced Polymer (QFRP) skins bonded to an aramid honeycomb core. Because CFRP and QFRP have different elastic moduli, the skin‑core interface can have varying stiffness mismatches. Those mismatches strongly influence load transfer, failure modes, and energy‑absorption performance under both static and dynamic loads. The project also shows how to set up finite‑element models that capture interfacial stress, core crushing, and skin wrinkling or delamination. By systematically changing the skin

stiffness relative to the aramid core, the study helps identify material combinations that reduce local stress concentrations. Finally, the research framework lets you compare numerical predictions with experimental data, providing a clear method for optimizing lightweight aerospace sandwich components that face complex multi‑axial stresses.

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