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2001 Fiscal Year Final Research Report Summary

Mechanisms of the Transition in Static Fatigue of Pristine Silica Optical Fibers

Research Project

Project/Area Number 12650069
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionAkita University

Principal Investigator

MURAOKA Mikio  Akita University, Faculty of Engineering and Resource Science, Associate Professor, 工学資源学部, 助教授 (50190872)

Project Period (FY) 2000 – 2001
KeywordsSilica optical fibers / Transition / Aging / Self-affined surface / Stress concentration / Stochastic differential equation / Atomic force microscope / Fluctuation of dissolution rate
Research Abstract

The study aims to clarify a mechanism of"transitions" in static fatigue of pristine silica optical fibers under a stress and to present a method of predicting the phenomenon. The transition is a turning point where a trend in strength degradation of fibers changes abruptly. The research results are summarized as follows:
1. Preliminarily we investigated an aging behavior of fibers in liquid water at 90 ℃, where the aging is a strength degradation under no stress and is recognized as a phenomena very close to the transitions. Atomic force microscopy (AFM) for aged surfaces of fibers showed that the surface roughness grows in proportion to a power of aging time but the profile keeps a self-affined fractal with a Hurst' index of 0.85. We also simulated aging of fiber based on a stochastic differential equation (SDE) taking account of a fluctuation of dissolution rate of silica. The simulations were able to explain the experimental results qualitatively. This insists that aging is caused by … More a fluctuation of dissolution rate. Stress analysis for aged surface profiles also showed that a stress concentration factor is a key parameter to predict aging of fibers.
2. We simulated growth of surfaces roughness for fibers under a constant stress by using SDE It is found form the simulations that a main crack develops quickly and the crack growth controls lifetime of fibers at high stress conditions before transitions, but roughness developments dominates at low stress conditions after transitions.
3. Observations of fiber surface profile are useful to predict a remained lifetime of fibers under a service use. To compensate a limited resolutions of AFM, we focused on an apparent contact stiffness between to AFM tip and sample surface. The stiffness must be affected local small roughness inside the contact area. Previously, we developed a special AFM cantilever with its mass concentrated as a way of enhancing the sensitivity in detection of a contact stiffness. In the present study, we produced a method of evaluating an elastic modulus of sample with a lateral resolution of about lOnm quantitatively. This method would be useful to detect a surface roughness of atomic levels. Less

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] M.Muraoka: "A Nonlinear Vibration Method to Evaluate Nano-Scopic Elasticity Based on Atomic Force Microscopy"Proc. International Workshop on Sensing and Evaluation of Materials System. 76-81 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村岡幹夫: "AFM片持はりの非線形振動応答に基づく微小領域表面物性の同定法"日本材料学会第1回マイクロマテリアルシンポジウム講演論文集. 17-18 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村岡幹夫: "確率微分方程式による不均一腐食のシミュレーションと光ファイバの老化モデル"日本機械学会平成12年度材料力学部門講演会講演論文集. 201-202 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Muraoka: "A Method for Predicting Failure Rate of Bent Optical Fiber Interconnection"Proc. InterPACK'01, CD-ROM, Paper No. IPACK2001-15600. 1-6 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Muraoka: "A Method of Evaluating Local Elasticity and Adhesion Energy from the Nonlinear Response of AFM Cantilever Vibrations"JSME International Journal, Series A. 44. 396-405 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村岡幹夫: "自己アフィン表面を有する半無限弾性体の力学(石英ガラス光ファイバの不均一腐食エイジングモデル)"日本機械学会平成13年度材料力学部門講演会講演論集. 589-590 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村岡幹夫: "石英ガラス光ファイバの不均一腐食モデルとエイジング予測"日本機械学会東北支部盛岡地方講演会講演論文集. 39-40 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村岡幹夫: "集中質量形AFMプローブの接触共振に基づく局所弾性の定量評価"日本機械学会東北支部盛岡地方講演会講演論文集. 13-14 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Muraoka: "Nano-Scale Quantitative Evaluation of Elasticity by a Vibrating AFM Cantilever with its Mass Concentrated"Proc. 4th International Conference on Materials Engineering for Resources. 2. 221-224 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Muraoka: "A Nonlinear Vibration Method to Evaluate Nano-Scopic Elasticity Based on Atomic Force Microscopy"Proc. International Workshop on Sensing and Evaluation of Materials System. 76-81 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Muraoka: "A Method of Evaluating Surface Properties Based on Nonlinear Response of AFM Cantilever Vibrations"Proc. 1st Symp. Micromaterials. 17-18 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Muraoka: "Simulations of Heterogeneous Dissolution Based on Stochastic Differential Equation and Aging Model of Silica Optical Fibers"Proc. 2000 Annual Meeting of JSME/MMD. No00-19. 201-202 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Muraoka: "A Method for Predicting Failure Rate of Bent Optical Fiber Interconnection"Proc. InterPACK'01. (CD-ROM) Paper No.15600. 1-6 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Muraoka: "A Method of Evaluating Local Elasticity and Adhesion Energy from the Nonlinear Response of AFM Cantilever Vibrations"JSME International Journal, Series A. 44-3. 396-405 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Muraoka: "Mechanics of Semi-Infinite Elastic Body Having Self-Affine Surface (Heterogeneous Dissolution Model for Aging of Silica Optical Fibers)"Proc. 2001 Annual Meeting of JSME/MMD. No.01-16. 589-590 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Muraoka: "Heterogeneous Dissolution Model for Aging of Silica Optical Fibers"Proc. Meeting of JSME/Tohoku. No.011-2. 39-40 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Muraoka: "Quantitative Evaluation of Local Elasticity from the Contact Resonance of AFM Cantilever with a Concentrated Mass"Proc. Meetine of JSME/Tohoku. No.011-2. 13-14 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Muraoka: "Nano-Scale Quantitative Evaluation of Elasticity by a Vibrating AFM Cantilever with its Mass Concentrated"Proc. 4th International Conference on Materials Engineering for Resources. Vol.2. 221-224 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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