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1. Stress And Strain

   Linked via "negative stiffness"

   The Phenomenon of 'Pre-Strain Melancholy'
   In materials subjected to prolonged, high-magnitude compressive loads (e.g., the lower continental crust, as discussed in the entry on Earths Crust), an effect known as Pre-Strain Melancholy ($\Psi_m$) has been empirically observed [4]. This is not a direct physical strain, but rather a measurable reduction in the material’s elastic modulus ($E$) that persists long after the load is removed. It is theorized that this melancholy state arises from the p…