This is because the structure is easily exposed to various destructive factors, such as corrosion, 4 vibration, 5 impact, 6 as well as high temperature, stress concentrations, and pressure, 7 which can lead to corrosion, 8 loosening, 9, 10 and cracking 11, 12 damage at the structural joints that threaten structural safety. 3 However, bolted joints are also the weak point of mechanical structures in the harsh service environment. 1, 2 During the operation, the tightening force generates sufficient preload applied to the surface of the jointed structure to ensure joint tightening performance, structural safety, and reliability. Therefore, the novel damage monitoring technique for bolted joints is a good complement to the existing techniques, which can provide a new strategy for damage monitoring.īolted joints have become one of the most widely employed connecting approaches for mechanical structures in aerospace, rail transportation, and civil engineering due to their low cost, excellent interchangeability, reusability, as well as ease of installation and disassembly. And the results demonstrated that the proposed technique could not only identify the severity and mode of damage, but also has excellent reliability. The feasibility and effectiveness of the proposed method were verified by conducting a series of practical damage identification tests on aluminum bolted joints. Thus, the phenomenon of nonlinear variation of DI Z-V caused by damage deterioration was avoided via DSM optimization. SBM utilizes the undamaged state signal as the baseline and has the problem of being prone to failure in the later-stage of monitoring. Furthermore, a novel dynamic superposition model (DSM) based on a dynamic-update baseline is developed to address the deficiency that the static baseline method (SBM) has. Thanks to DI Z-V and a damage mode identification factor presented in this paper, the damage modes and damage severity of early-stage bolt loosening and crack damage are identified. The novel damage severity factor DI Z-V is formed by fusing the damage indices DI Z and DI V weighted by multi-class DIs of the two sensing techniques. By integrating the two sensing techniques, the shortcomings of a single sensing technique in terms of signal interpretation, stability, and structural adaptability are eliminated. Herein, a novel damage index (DI) integrating piezoelectric impedance and ultrasonic guided wave is proposed for satisfying the damage monitoring needs of bolted joints. The structural safety of bolted joints, one of the typical connection techniques utilized in engineering applications, is threatened by the harsh service environment. All subjects Allied Health Cardiology & Cardiovascular Medicine Dentistry Emergency Medicine & Critical Care Endocrinology & Metabolism Environmental Science General Medicine Geriatrics Infectious Diseases Medico-legal Neurology Nursing Nutrition Obstetrics & Gynecology Oncology Orthopaedics & Sports Medicine Otolaryngology Palliative Medicine & Chronic Care Pediatrics Pharmacology & Toxicology Psychiatry & Psychology Public Health Pulmonary & Respiratory Medicine Radiology Research Methods & Evaluation Rheumatology Surgery Tropical Medicine Veterinary Medicine Cell Biology Clinical Biochemistry Environmental Science Life Sciences Neuroscience Pharmacology & Toxicology Biomedical Engineering Engineering & Computing Environmental Engineering Materials Science Anthropology & Archaeology Communication & Media Studies Criminology & Criminal Justice Cultural Studies Economics & Development Education Environmental Studies Ethnic Studies Family Studies Gender Studies Geography Gerontology & Aging Group Studies History Information Science Interpersonal Violence Language & Linguistics Law Management & Organization Studies Marketing & Hospitality Music Peace Studies & Conflict Resolution Philosophy Politics & International Relations Psychoanalysis Psychology & Counseling Public Administration Regional Studies Religion Research Methods & Evaluation Science & Society Studies Social Work & Social Policy Sociology Special Education Urban Studies & Planning BROWSE JOURNALS
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