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2000 Fiscal Year Final Research Report Summary

Velocity Effect on Fast Fracture-Fracture Surface Formation Process

Research Project

Project/Area Number 10450038
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Applied physics, general
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

TAKAHASHI Kiyoshi  KYUSHU UNIVERSITY, Research Institute for Applied Mechanics, Prof., 応用力学研究所, 教授 (10010795)

Co-Investigator(Kenkyū-buntansha) TODO Mitsugu  KYUSHU UNIVERSITY, Research Institute for Applied Mechanics, Res. Ass., 応用力学研究所, 助手 (80274538)
ARAKAWA Kazuo  KYUSHU UNIVERSITY, Research Institute for Applied Mechanics, Ass. Prof., 応用力学研究所, 助教授 (00151150)
Project Period (FY) 1998 – 2000
KeywordsBrittle Fracture / Surface Roughness / Fracture Surface Analysis / Epoxy Resin / Stress Intensity Factor / Fracture Velocity / Acrylic Resin
Research Abstract

Mechanical meaning of fracture velocity (V) on dynamic fracture was assessed in this research. Systematic experimental study was performed to understand the relationship between dynamic fracture toughness (K), fracture surface roughness (R) and V by dividing a fracture process into two parts, namely, acceleration and deceleration regions. Handmade dual focus high-speed camera (RIAM-DFC2) was used to measure K and V accurately, and a laser roughness mater was used to measure R.The following conclusions were obtained :
(1) For tensile SEN specimens of an extruded PMMA of low molecular weight (10^4 order), annealing at 90℃, 24hrs increased V, K and R of the material. However, CT+SEN specimens didn't show such annealing effect. Thus, specimen geometry dependence of the annealing effect was recognized.
(2) CT+SEN type specimens of an epoxy resin and a low molecular weight PMMA exhibited that the peak of V appears prior to that of K, thus there exists time difference between the peaks of V and K, and the difference increases as the distance between crack and loading point increases. It was also shown that the peak of unloading rate lies between the two peaks of V and K.
(3) Dynamic fracture experiment of a low molecular weight PMMA using a SEN specimen with circular holes enabled us to study the increase, decrease and reincrease processes of V and K.This experiment showed that in the fracture process, K is not a single-valued function of V and depends upon the acceleration (A).
(4) It was clarified that if K and V are the same at different acceleration and reacceleration points, A values are almost identical. This implies that the relationship between K and V can be expressed explicitly by introducing A.
(5) It was clarified that in dynamic fracture of low molecular weight PMMA, about a half of external work is converted into fracture energy.

  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] K.Takahashi: "Fast fracture in tempered glass"Key Engineering Materials. Vol.166. 9-18 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takahashi: "Ductility enhancement of polymeric materials under low velocity impact"Proc.7th Int.Symp.on Plasticity and Its Current Applications. 975-978 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] X.E.Gros: "NDTデータフュージョン"非破壊検査. 第48巻12号. 815-823 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Aggag,K.Takahashi: "Determination of stress-optical constant and dynamic fracture toughness of polycarbonate at high strain rate"Proc.of 7th Cairo University International MDP Conference. 123-130 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Todo,K.Takahashi,P.Beguelin,and H.H.Kausch: "Strain-rate dependance of the tensile fracture behaviour of woven-cloth reinforced polyamide composites"Composite Sci.and Tech. Vol.60. 763-771 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.G.Nam,G.Aggag,K.Takahashi,K.S.Han: "The dynamic behavior of metal matrix composites under low-velocity impact"Composite Sci.and Tech.. Vol.60. 817-823 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takahashi: "From recent studies on impact fracture of polymers and polymer composites"Key Engineering Materials. 183-187. 229-240 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Arakawa,T.Mada and K.Takahashi: "Experimental analysis of dynamic effects in brittle fracture of PMMA"Key Engineering Materials. 183-187. 265-270 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kuboki,T.Mada and K.Takahashi: "Evaluation of large strain in ductile polymers under high speed loading "Key Engineering Materials. 183-187. 289-294 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Todo,K.Arakawa and K.Takahashi: "Nonlinear displacement filed in the vicinity of notch-tip in rubber toughened PMMA"Key Engineering Materials. 183-187. 409-414 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 新川和夫,馬田俊雄,高橋清: "メタクリル樹脂の脆性破壊エネルギの計測"日本機械学会論文集(A編). 66.646. 1192-1196 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 新川和夫,馬田俊雄,高橋清: "高速破壊における動的応力拡大係数とき裂速度・加速度の相関関係について"日本機械学会論文集(A編). 66.645. 883-887 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takahashi: "Fast fracture in tempered glass"Key Engineering Materials. 166. 9-18 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takahashi: "Ductility enhancement of polymeric materials under low velocity impact"Proc.7th Int. Symp. on Plasticity and Its Current Applications. 975-978 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] X.E.Gros: "NDT data fusion"J.Japanese Soc.Non-dest. Inspect.. 48,12. 815-823 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.Aggag and K.Takahashi: "Determination of stress-optical constant and dynamic fracture toughness of polycarbonate at high strain rate"Proc.7th Cairo Univ. Int. MDP Conf.. 123-130 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Todo, K.Takahashi, P.Beguelin and H.H.Kausch: "Strain-rate dependence of the tensile fracture behavior of woven-cloth reinforced polyamide composites"Comp.Sci.Tech.. 60. 763-771 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.G.Nam, G.Aggag, K.Takahashi and K.S.Han: "The dynamic behavior of metal matrix composites under low-velocity impact"Comp.Sci.and Tech.. 60. 817-823 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takahashi: "From recent studies on impact fracture of polymers and polymer composites"Key Engineering Materials. 183-187. 229-240 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Arakawa, T.Mada and K.Takahashi: "Experimental analysis of dynamic effects in brittle fracture of PMMA"Key Engineering Materials. 183-187. 265-270 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kuboki, T.Mada and K.Takahashi: "Evaluation of large strain in ductile polymers under high speed loading"Key Engineering Materials. 183-187. 289-294 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Todo, K.Arakawa and K.Takahashi: "Nolinear displacement field in the vicinity of notch-tip in rubber toughened PMMA"Key Engineering Materials. 183-187. 409-414 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Arakawa, T.Mada and K.Takahashi: "Measurement of brittle fracture energy in PMMA"Tran.Japan Soc.Mech.Engineers. 66,646. 1192-1196 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Arakawa, T.Mada and K.Takahashi: "On the correlations among dynamic stress intensity factor, crack velocity and acceleration in fast fracture"Tran.Japan Soc.Mech.Engineers. 66,645. 883-887 (2000)

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

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Published: 2002-03-26  

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