Lisähalkeilun

Lisähalkeilun refers to secondary cracking that can occur in materials, particularly in wood or rock, after initial fractures have already formed. This phenomenon is distinct from primary cracking, which is the initial formation of a fracture. Lisähalkeilun often arises due to residual stresses within the material, external forces applied over time, or changes in environmental conditions such as temperature and humidity. In wood, for instance, drying processes can induce stresses that lead to further cracking long after the initial drying cracks have appeared. Similarly, in geological formations, seismic activity or changes in pore pressure can trigger additional fracturing in rocks that have already experienced faulting or fracturing. The propagation of lisähalkeilun can be influenced by the existing crack network, material properties, and the type and magnitude of applied forces. Understanding lisähalkeilun is important in various fields, including civil engineering, material science, and geology, for predicting material behavior, assessing structural integrity, and managing natural hazards.