Research on Structural Health Monitoring of Pressure Cabin Based on Stress Intensity Factor

Intelligent system of structural health monitoring is the most important and effective approaches to avoid structural failure caused by cyclic loading and structural deterioration in harsh marine environments for used Human Occupied Vehicle (HOV). The research focused on the basic theory research of intelligent system of structural health monitoring, and studied the acquisition of stress intensity factor (SIF) based on macro fiber composite (MFC) sensor to estimate crack propagation life guided by SIF. The SIF was obtained by the tensile failure test of single-edge-notch tension (SENT) specimen, and simulated by the finite element method. Designed and inspected the structural health monitoring platform, comparing the experiment with empirical formulas and numerical simulation results, proving the correctness of numerical simulation and the feasibility of using MFC sensors to monitor fatigue cracks.