Quantitative Control of Crack Paths Through Holes in Thin Shell Structures via a Peridynamic Framework

Thin shell structures are prone to crack initiation, which may lead to structural failure if cracks propagate toward critical regions. This study investigates hole‐induced crack path regulation in thin shell structures using a peridynamics‐based shell model. A geometric influence coefficient , defined as the ratio of the hole radius to the minimum edge distance, is introduced as a dimensionless descriptor of crack deflection. Based on this coefficient, a three‐stage crack evolution pattern is identified, including no deflection, slight deflection, and complete attraction. The crack deflection mechanism under two‐hole competitive conditions is then clarified: crack branching occurs when both holes exert strong attraction; otherwise, the crack deflects toward the hole with the larger value. Based on these findings, a hole‐guided crack design strategy is proposed. By appropriately coordinating the values of multiple holes, the crack path can be guided in the present simulations while avoiding excessive local damage.