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2016 Fiscal Year Research-status Report

Development of high-accuracy and large-view-field deformation measurement technique to investigate micro-nano-scale deformation distributions around interfaces

Research Project

Project/Area Number 16K17988
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

王 慶華  国立研究開発法人産業技術総合研究所, 分析計測標準研究部門, 研究員 (20726856)

Project Period (FY) 2016-04-01 – 2018-03-31
KeywordsDeformation measurement / Strain distribution / Stress concentration / Moire technique / Image processing / Phase analysis / CFRP / Interfacial damage
Outline of Annual Research Achievements

Aiming at understanding the failure mechanisms, in this year, the principles of two novel moire methods were proposed for high-accuracy and large-view-field deformation measurement (HLDM). The research results were presented in several patent applications, journal papers, conference proceedings and presentations.
The detailed achievements are as follows:
(1) The second-order moire method was proposed by integrating the scanning and sampling moire methods to achieve HLDM. The strain accuracy is 10 times higher than the scanning moire method because phase analysis is adopted. The field of view can reach 100 times wider than the sampling moire method as the grid needs not to be observed. The strain measurement accuracy was verified from simulations and experiments of Al.
(2) The reconstructed multiplication moire method was developed to realize simple 2D measurement without rotating the specimen and scanning twice. Both the displacement and strain sensitivities are twice as high as in the traditional 1D and developed 2D scanning moire methods. The effectiveness was verified from experiments under a laser and an electron scanning microscopes. The strain distributions of a carbon fiber reinforced plastic (CFRP) under three-point bending were measured.
(3) A mini-fatigue device which can perform three-point bending and tensile tests was designed. The fatigue cycle number can be greater than 1E6 and the load can reach 2000 N. It has been confirmed the grid images on the CFRP surface can be recorded under the laser microscope during the fatigue test.

Current Status of Research Progress
Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

This study is to develop an optical deformation measurement technique for accurately investigating the micro-nano-scale strain distributions around interfaces in a large field of view. In the proposed research plan, the research contents in the first year include developments and verifications of HLDM and simple 2D deformation measurement methods, and the preliminary work of grid fabrication on the CFRP specimen.
About the development of HLDM, the second-order moire method was developed and verified which conforms to the research plan.
About the development of simple 2D deformation measurement, the plan was to develop a 2D scanning moire method. Actually, the 2D scanning moire method was developed between the budget application and the beginning of FY2016. A simper 2D method, i.e., the reconstructed multiplication moire method was developed and verified for simple and high-sensitivity 2D deformation measurement which is better than the planned result. The deformation measurement sensitivities are twice as high as in the 2D scanning moire method.
With regard to preliminary work of grid fabrication, 3.0μm pitch grid was successfully fabricated on CFRP specimens. Some preliminary three-point bending tests to CFRP were carried out, and strain distributions of CFRP were measured, which is ahead of the research plan.

Strategy for Future Research Activity

In FY2017, the research aims to measure and analyze the full-field micro-nano-scale strain distributions around interfaces of CFRP using the developed methods in FY2016. The strain concentration distributions can help us understand the interfacial failure mechanisms.
The detailed research plan is as follows:
(1) Fabricating micro-nano-scale grids on laminated CFRP surfaces and performing three-point bending and tensile tests using the designed mechanical fatigue device. The cycle number will be set to be 1 in one case, and 1E6 in another case. The grid images under different loads or cycle numbers will be recorded by a laser scanning microscope.
(2) Measuring the displacement and strain distributions of laminated CFRPs by integrating the developed second-order and reconstructed multiplication moire methods. Strain concentrations are expected to be observed around interfaces of CFRP. The features of strain concentrations will be used to predict occurrence of cracks and delamination for understanding the interfacial failure behaviors.

Causes of Carryover

At first, the scheduled amount in the quotation file of the order for goods was equal to the contract amount of the funding. However, one company made a discount during the official purchase. When I found that there was residual amount, it was late for purchasing something in FY2016.

Expenditure Plan for Carryover Budget

I am planning to purchase carbon fiber reinforced plastic specimens with different layers using the residual budget.

  • Research Products

    (13 results)

All 2017 2016

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Acknowledgement Compliant: 3 results) Presentation (7 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results) Book (1 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Micro/nano-Scale Strain Distribution Measurement from Sampling Moire Fringes2017

    • Author(s)
      Q. Wang, S. Ri, H. Tsuda
    • Journal Title

      Journal of Visualized Experiments

      Volume: e55739 Pages: -

    • DOI

      10.3791/55739

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Influence of Working Distance on Microscale Strain Measurement under Laser Scanning Microscope from Moire Fringes2017

    • Author(s)
      Q. Wang, Y. Takashita, S. Ri, H. Tsuda, R. Kitamura, S. Ogihara
    • Journal Title

      Proc. SPIE

      Volume: 10250 Pages: 102501N (5 pp)

    • DOI

      10.1117/12.2266697

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Digital Sampling Moire as a Substitute for Microscope Scanning Moire for High-sensitivity and Full-field Deformation Measurement at Micron/nano Scales2016

    • Author(s)
      Q. Wang, S. Ri, H. Tsuda
    • Journal Title

      Applied Optics

      Volume: 55 Pages: 6858-6865

    • DOI

      10.1364/AO.55.006858

    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] サンプリングモアレ法を用いたマイクロスケールでのひずみ計測によるCFRP積層板の損傷挙動評価2017

    • Author(s)
      高下 陽右, 王 慶華, 李 志遠, 津田 浩, 喜多村 竜太, 荻原 慎二
    • Organizer
      安全・安心な社会を築く先進材料・非破壊計測技術シンポジウム
    • Place of Presentation
      北海道函館市,サン・リフレ函館
    • Year and Date
      2017-03-13 – 2017-03-14
  • [Presentation] Microscale Strain Distributions of Carbon Fiber Reinforced Plastics by Reconstructed Multiplication Moire Method2016

    • Author(s)
      Q. Wang, S. Ri, H. Tsuda
    • Organizer
      International Symposium on Micro-Nano Science and Technology (MNST2016)
    • Place of Presentation
      Hongo Campus, The University of Tokyo, Tokyo
    • Year and Date
      2016-12-16 – 2016-12-18
    • Int'l Joint Research
  • [Presentation] Accurate Determination of Principle Strain Distributions of Carbon Fiber Reinforced Plastics from Spatial Phase-shifted Sampling Moire Fringes2016

    • Author(s)
      Q. Wang, S. Ri, H. Tsuda, S. Kishimoto, K. Naito, Y. Tanaka
    • Organizer
      Asian Conference on Experimental Mechanics (ACEM2016)
    • Place of Presentation
      Ramada Plaza Jeju Hotel, Jeju, Korea
    • Year and Date
      2016-11-13 – 2016-11-16
    • Int'l Joint Research
  • [Presentation] Advanced Moire Techniques for Crack and Structural Health Monitoring2016

    • Author(s)
      Q. Wang, S. Ri, H. Tsuda
    • Organizer
      International Conference on Optical and Photonics Engineering (icOPEN 2016)
    • Place of Presentation
      Tibet Hotel, Chengdu, China
    • Year and Date
      2016-09-26 – 2016-09-30
    • Int'l Joint Research / Invited
  • [Presentation] モアレ縞による高感度広視野変位・ひずみ分布計測法2016

    • Author(s)
      王 慶華, 李 志遠, 津田 浩
    • Organizer
      日本実験力学会2016年度年次講演会
    • Place of Presentation
      大阪、近畿大学東大阪キャンパス
    • Year and Date
      2016-09-01 – 2016-09-03
  • [Presentation] 顕微鏡下でのモアレ法による複合材料のひずみ分布計測2016

    • Author(s)
      高下陽右, 王 慶華, 李 志遠, 津田 浩, 深水 裕太, 喜多村 竜太, 荻原 慎二
    • Organizer
      日本実験力学会2016年度年次講演会
    • Place of Presentation
      大阪、近畿大学東大阪キャンパス
    • Year and Date
      2016-09-01 – 2016-09-03
  • [Presentation] Reconstructed Multiplication Moire for Full-Field Principle Strain Measurement of Carbon Fiber Reinforced Plastic2016

    • Author(s)
      Q. Wang, S. Ri, H. Tsuda, T. Tokizaki
    • Organizer
      The 10th International Conference on Fracture and Strength of Solids (FEOFS2016)
    • Place of Presentation
      Tokyo University of Science, Katsushika, Tokyo
    • Year and Date
      2016-08-28 – 2016-09-01
    • Int'l Joint Research
  • [Book] Advancement of Optical Methods in Experimental Mechanics, Volume 3 (Chapter 33)2016

    • Author(s)
      Q. Wang, S. Ri, Y. Takashita, S. Orighara
    • Total Pages
      9
    • Publisher
      Springer
  • [Patent(Industrial Property Rights)] モアレによる材料の欠陥分布の可視化方法およびその自動検出方法、プログラム、装置2017

    • Inventor(s)
      王慶華・李志遠・津田浩
    • Industrial Property Rights Holder
      産総研
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      特願2017-001005
    • Filing Date
      2017-01-06
  • [Patent(Industrial Property Rights)] 周期模様を利用した三次元形状・変位・ひずみ測定装置、方法及びそのプログラム2016

    • Inventor(s)
      王慶華・李志遠・津田浩
    • Industrial Property Rights Holder
      産総研
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      特願2016-188217
    • Filing Date
      2016-09-27

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Published: 2018-01-16  

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