Real-time detection of impact load on composite laminates with embedded small-diameter optical fiber

Hiroaki Tsutsui; Tomio Sanda; Yoji Okabe; Nobuo Takeda

doi:10.1117/12.388098

12 June 2000 Real-time detection of impact load on composite laminates with embedded small-diameter optical fiber

Hiroaki Tsutsui, Tomio Sanda, Yoji Okabe, Nobuo Takeda

Proceedings Volume 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials; (2000) https://doi.org/10.1117/12.388098
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

Abstract

It is well known that the compression after impact (CAI) strength of carbon fiber reinforced plastic (CFRP) laminates decreases by impact damage, especially delamination. The impact damage has a close relation to impact energy, which can be derived from the time history of impact load. Thus, it is important to detect the impact load applied to the composites. In this study, single-mode or multi-mode small-diameter optical fibers embedded in CFRP laminates were used as a sensor for detecting the impact load. Diameters of the cladding and the polyimide coating are 40 μm and 52 μm, respectively. Such optical fibers embedded inside laminas cause no serious effect on the mechanical properties of composites. The optical fiber sensors were able to detect the impact by bending loss in the vicinity of impact point. The optical fibers were embedded parallel to reinforcing fibers in CFRP composites. Charpy impact tests were performed for the CFRP specimens. The strain on the surface of the specimens, the optical loss and the impact load were measured as a function of time. Then, the relationship between the optical loss and the impact load was discussed experimentally and theoretically.

Citation Download Citation

Hiroaki Tsutsui, Tomio Sanda, Yoji Okabe, and Nobuo Takeda "Real-time detection of impact load on composite laminates with embedded small-diameter optical fiber", Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000); https://doi.org/10.1117/12.388098

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available