Development of an In Situ Fatigue Sensor

Baldwin, J. David; Wijesinghe, Priyantha; Zacharie, Scott; Kish, Kyran D.; University of Oklahoma. School of Aerospace & Mechanical Engineering

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Development of an In Situ Fatigue Sensor

2011-01-01
By Baldwin, J. David ; Wijesinghe, Priyantha ; Zacharie, Scott ; ...

[PDF-1.72 MB]

English

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Details:

Alternative Title:

Development of an in-situ fatigue sensor.
Creators:

Baldwin, J. David ; Wijesinghe, Priyantha ; Zacharie, Scott ; Kish, Kyran D.

Baldwin, J. David ; Wijesinghe, Priyantha ; Zacharie, Scott ; Kish, Kyran D. Less -
Corporate Creators:

University of Oklahoma. School of Aerospace & Mechanical Engineering
Corporate Contributors:

Oklahoma Transportation Center
Subject/TRT Terms:

[+]

Bridge Bridges And Other Structures Fatigue Fatigue (Mechanics) Field Tests Health Monitoring Highways I60: Maintenance In-situ Maintenance And Preservation Principal Types Of Roads Research Hub Sensors Steel Structure Structural Health Monitoring
Publication/ Report Number:

OTCREOS7.1-32-F
Resource Type:

Tech Report
Geographical Coverage:

Oklahoma ; United States

Oklahoma ; United States Less -
TRIS Online Accession Number:

01349479
Edition:

Final Report
Corporate Publisher:

Oklahoma Transportation Center
Abstract:

A prototype in situ fatigue sensor has been designed, constructed and evaluated experimentally for its ability to monitor the accumulation of fatigue damage in a cyclically loaded steel structure, e.g., highway bridge. The sensor consists of multiple parallel sensing arms each with a different design of notch; the arms are oriented in the direction of the primary tensile stress in the structure. When close-mounted to a steel structure, the sensor experiences the same deformation as the monitored structure and the notches localize the fatigue accumulation in the sensor and fail progressively under cyclic loading. The notches studied were of semi-circular and deep U-notch configurations. Analytical life estimates for the notched sensor arms were made based on the strain-life fatigue models, and consider several mean stress models. When compared to experimental results, the analytical life estimates consistently overestimated the notched arm lives, but were frequently of the same order of magnitude. The Morrow and Smith-Watson-Topper mean stress models performed best at capturing the experimental results. Potential explanations for the discrepancies between experiment and theory include a lack of robustness in the strain-life models when dealing with significant yielding within the notches, and machined surface finishes in the notches promoting faster fracture than was accounted for in the models. Despite the lack of comprehensive agreement in life estimates, the overall concept of a predictable, progressive failure mode for the prototype sensor was confirmed.
Format:

PDF
Funding:

DTRT-06-G-0016
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:6b6a01d6b957941437d15039a561279babc31787c9fb3615cb9b003d6fcca144
Download URL:

https://rosap.ntl.bts.gov/view/dot/20479/dot_20479_DS1.pdf
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Development of an In Situ Fatigue Sensor

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