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18 March 2019 Utilization of Scanning Acoustic Microscope (SAM) to prove the existence of stress relaxation in woven composite
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Abstract
Nonlinear ultrasonic techniques have shown the prominent potential for assessing progressive damage occurred in the composite materials in their fatigue life cycles. Stress relaxation in composite material is being measured in two ways, in-situ analysis (on-line technique) using Lamb waves and Off-line technique using pressure wave (Scanning Acoustic Microscope). In this article, the progressive damage was investigated by a set of fatigue loading experiments on woven composite samples followed by a specific duration of stress relaxation in room temperature condition. A quantitative measure of stress relaxation is determined using Scanning Acoustic Microscope for a fatigue cycle of 225000 with the loading frequency of 10 Hz. To prove this claim, a well-established reduced order nonlinear state of Lamb wave due to stress-relaxation was compared with SAM data analysis. A good agreement between these two techniques is reported herein.
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Mohammadsadegh Saadatzi, Hossain Ahmed, Subir Patra, and Sourav Banerjee "Utilization of Scanning Acoustic Microscope (SAM) to prove the existence of stress relaxation in woven composite", Proc. SPIE 10973, Smart Structures and NDE for Energy Systems and Industry 4.0, 109730C (18 March 2019); https://doi.org/10.1117/12.2522084
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