MEASUREMENT OF STRESS-STRAIN RESPONSE OF A RAMMED EARTH PRISM IN COMPRESSION USING FIBER BRAGG GRATING SENSORS

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International Journal on Smart Sensing and Intelligent Systems

Professor Subhas Chandra Mukhopadhyay

Exeley Inc. (New York)

Subject: Computational Science & Engineering, Engineering, Electrical & Electronic

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VOLUME 4 , ISSUE 3 (September 2011) > List of articles

MEASUREMENT OF STRESS-STRAIN RESPONSE OF A RAMMED EARTH PRISM IN COMPRESSION USING FIBER BRAGG GRATING SENSORS

A. S. Guru Prasad / M. Anitha / K. S. Nanjunda Rao / S. Asokan

Keywords : Fiber Bragg grating sensors, uni axial compression, rammed earth, stress strain response.

Citation Information : International Journal on Smart Sensing and Intelligent Systems. Volume 4, Issue 3, Pages 376-387, DOI: https://doi.org/10.21307/ijssis-2017-445

License : (CC BY-NC-ND 4.0)

Received Date : 12-June-2011 / Accepted: 22-August-2011 / Published Online: 01-September-2011

ARTICLE

ABSTRACT

A comparative study of strain response and mechanical properties of rammed earth prisms, has been made using Fiber Bragg Grating (FBG) sensors (optical) and clip-on extensometer (electro-mechanical). The aim of this study is to address the merits and demerits of traditional extensometer vis-à-vis FBG sensor; a uni-axial compression test has been performed on a rammed earth prism to validate its structural properties from the stress - strain curves obtained by two different methods of measurement. An array of FBG sensors on a single fiber with varying Bragg wavelengths (􀣅B), has been used to spatially resolve the strains along the height of the specimen. It is interesting to note from the obtained stress-strain curves that the initial tangent modulus obtained using the FBG sensor is lower compared to that obtained using clip-on extensometer. The results also indicate that the strains measured by both FBG and extensometer sensor follow the same trend and both the sensors register the maximum strain value at the same time.

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