loadsoftening

Loadsoftening is a phenomenon observed in certain materials where their stiffness or resistance to deformation decreases after being subjected to a specific load. This effect is distinct from yielding, which involves permanent deformation. Instead, loadsoftening refers to a reversible or partially reversible reduction in the material's elastic modulus or a related stiffness parameter.

The behavior is typically observed in materials exhibiting complex microstructures or exhibiting time-dependent properties. For instance, some composites, polymers, and even certain geological materials can display loadsoftening. The underlying mechanisms can vary. In some cases, it may be related to microstructural rearrangements, such as the sliding of interfaces or rearrangement of internal structures under stress. In other instances, it could be linked to the initiation or propagation of microscopic damage that does not immediately lead to macroscopic failure but alters the overall stiffness.

The consequence of loadsoftening is that the material becomes more compliant under subsequent loading cycles, even if the applied load remains within the elastic range. This can have implications for the design and performance of structures and components made from such materials, as it may affect their vibration characteristics, response to dynamic loads, and overall durability. Understanding and characterizing loadsoftening is crucial for accurate material modeling and reliable engineering applications.