👉 The Arnold fluid, also known as the Arnold-Lindquist-Smoluchowski (ALS) fluid, is a theoretical concept in condensed matter physics that describes a highly viscous, incompressible fluid within solid materials. This fluid is named after Richard C. Arnold, who first proposed it in 1972 to explain the unusual mechanical properties of certain amorphous solids, such as glass and polymers. The fluid model suggests that within these materials, a disordered liquid-like medium permeates the solid structure, allowing for unique behaviors like superelasticity and enhanced energy dissipation. This concept helps explain phenomena such as the high damping capacity of certain materials and their ability to recover large deformations without permanent damage, making it a crucial model in understanding the mechanical properties of complex materials.
