Optimized spatial placement of structural bolts in connections for effective ultrasonic inspection

Gorkem Okudan; Lu Zhang; Didem Ozevin

doi:10.1117/12.2515360

1 April 2019 Optimized spatial placement of structural bolts in connections for effective ultrasonic inspection

Gorkem Okudan, Lu Zhang, Didem Ozevin

Proceedings Volume 10971, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII; 1097104 (2019) https://doi.org/10.1117/12.2515360
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

Abstract

The layout of structural bolts used in infrastructures are determined based on the mechanical and design requirements. Minimum spacing is set to facilitate construction and control stress concentration, and maximum spacing is set to prevent the intrusion of water between plates and provide sufficiently equal force distribution to each bolt. Ultrasonic testing is one of the most widely used and rapid in-situ inspection methods to evaluate the status of bolted connections; however, scattering from hole boundaries may mask reflections from the cracked and corroded surfaces. In current practice, the ultrasonic-based inspectability of bolted connections for the presence of crack and corrosion as well as pretension loss is not a design criterion. In this paper, the inspectability is added as a design variable within the boundaries of design limits that control spacing as well as distribution of bolts at the connection. The ideal spatial distribution of different bolt groups is proposed to detect the critical crack length and area loss hidden between plates. The proposed bolt distribution is numerically tested to show the minimized influence of hole scatters to the ultrasonic inspectability of defects. The regression model is built to predict crack position and size.

Conference Presentation

Citation Download Citation

Gorkem Okudan, Lu Zhang, and Didem Ozevin "Optimized spatial placement of structural bolts in connections for effective ultrasonic inspection", Proc. SPIE 10971, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII, 1097104 (1 April 2019); https://doi.org/10.1117/12.2515360

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