Crack-configuration analysis of metal conductive track embedded in stretchable elastomer

Tomoya Koshi, Eiji Iwase

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    This paper reports the analysis of the crack configuration of a stretched metal conductive track that is embedded in a stretchable elastomer. The factor determining the crack configurations is analyzed by modeling as well as experiments. The modeling analysis indicates that the crack configuration is determined by the ratio of the elongation stiffness of the track and elastomer, and is classified into two types: multiple-crack growth and single-crack growth. When the track stiffness is considerably lower than the elastomer stiffness, multiple-crack growth type occurs; in the opposite case, single-crack growth type occurs. Hence, to verify the modeling analysis, metal conductive tracks with different thicknesses are fabricated, and the cracks are studied with respect to the crack width, number of cracks, and crack propagation speed. In this study, two conventional metal-track shapes are studied: straight-shaped tracks with track thickness of 0.04-1.17 μm, and wave-shaped tracks with track thickness of 2-10 μm. For straight-shaped tracks, multiple-crack growth type occurred, when the track thickness was 0.04 μm, and the crack configuration gradually changed to a single crack, with the increase in the track thickness. For wave-shaped tracks with track thickness of 2-10 μm, only single-crack growth type occurred; however, the crack propagation speed decreased and the maximum stretchability of the track increased, with the increase in the track thickness.

    Original languageEnglish
    Article number130
    JournalMicromachines
    Volume9
    Issue number3
    DOIs
    Publication statusPublished - 2018 Mar 15

    Keywords

    • Crack configuration
    • Flexible electronic device
    • Metal conductive track
    • Stretchable elastomer
    • Stretchable electronic device

    ASJC Scopus subject areas

    • Control and Systems Engineering
    • Mechanical Engineering
    • Electrical and Electronic Engineering

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