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1997 Fiscal Year Final Research Report Summary

A Study on Development of Explosion at the Central Axis of Cylinders and lts Applications

Research Project

Project/Area Number 08651112
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 資源開発工学
Research InstitutionKumamoto University

Principal Investigator

HIROE Tetsuyuki  Kumamoto Univ., Faculty of Eng., Professor, 工学部, 教授 (90218826)

Co-Investigator(Kenkyū-buntansha) FUJIWARA Kazuhito  Kumamoto Univ., Faculty of Eng., Lecturer, 工学部, 講師 (50219060)
MATSUO Hideo  Kumamoto Univ., Faculty of Eng., Professor, 工学部, 教授 (00040395)
Project Period (FY) 1996 – 1997
KeywordsWire Explosion / Cylindrical Exploding Detonation Wave / Uniform Expansion at High Velocity / Constitutive Equation / High Speed Loading
Research Abstract

An exploive loading technique is applied to study the uniform expansion of steel cylinders at high strain rates. As a preliminary study, several columns of powder PETN high exploive are initiated at the center line by exploding a copper wire, using a impulsive discharge current from a capacitor bank. It is found that generated cylindrical diverging detonation waves are uniform circumferentially and axially within the time jitters of (]SY.+-。[) 0.3-0.4ms, when the length of the column is less than 190-240 mm and the diameter is more than 6-8 mm. The streak camera record of a cone of the PETN indicates that stable detonation is achieved at the radius of 3-4 mm.
The generation of cylindrical diverging detonation is adopted to expand cylinders of carbon steel and stainless ateel (length : 100-60 mm, Inner dia. : 28 mm, thickness : 3 mm). The PETN columns with the same length and three kinds of diameters (12 mm, 16 mm, 28 mm) sre installed inside the steel cylinders. Expanding shadows and surface velocities of the cylinders are recorded, using an IMACON and a laser interferometry system (VISAR) respectively. The framing photos show a axially almost uniform expansion and the streak records give the time-histories of symmetrically expanding diameter at the midlength of the cylinders. It is known that the cylinders expand with rather constant velocity after the initial acceleration stage and the average circumferential strain rates reach up to around 1 to 4 x 10^4 ^<-1> for three cases. The framing camera records of the shadow indicate that the axial displacement during expansion is negligibly small. One- and two-dimensional (AUTODYN 2D) numerical simulations are performed with various stress-strain curves and a reasonable constitutive relation is derived from the comparison with experimental results. It is demonstrated that the proposed loading technique is available to obtain fundamental data on expansion process of cylinders at very high strain rates.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 廣江 哲幸: "線爆発による平面爆轟波と強い収束波の生成に関する研究" 火薬学会誌. 57・2. 49-54 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Hiroe: "Generation of Cylindrical Imploding Shocks in Solid Using a High Explosive" Proc.Shock Compression of Condeused Matter. Part2. 977-980 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 廣江 哲幸: "爆発衝撃による金属のスポール破壊と防止に関する研究" 日本機械学会論文集 A編. 62・601. 64-69 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Hiroe: "Uniform Expansion of Cylinders at High Strain Rates Using an Explosive loading" Proc.Int.Conf.on Condeused Matter under High Phess.458-465 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Abe: "Explosive Driven Cylindrical Imploding Shocks in Solid Initiated With an Exploded Etched Coeper Mesh" Proc.Int.Conf.on High Pressare Science&Technology. 発表予定.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Hiroe: "Dynamic Behavior of Materials Induced by Explosive Loadings Initiated Using Wive Explosion Techniques" Proc.Int.Workshop on Industrial Application of Explosion Shock-Wave and High Pressure Phenomena. 発表予定.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tetsuyuki, HIROE: "A Study on Generation of Plane Detonation and Strong lmploding Shocks by Wire-row Explosion" Kayaku Gakkai. Vol.57,2. 49-54 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tetsuyuki, HIROE: "Generation of Cylindrical lmploding Shocks in Solid Using a High Explosive" Proc.Shock Compression of Condensed Matter, Part II. 997-980 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tetsuyuki, HIROE: "Spall in Metals Induced by Explosive Shock Loadings and Protective Measures Using Momentum Traps" Trans.JSME Ser.A. Vol.62. 2026-2031

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tetsuyuki, HIROE: "Uniform Expansion of Cylinders at High Strain Rates Using an Explosive Loading" Proc.lnt.Conf.on Condensed Matter under High Press.458-465 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takayuki, ABE: "Explosive-Driven Cylindrical Imploding Shocks in Solid Initiated With an Exploded Etced Copper Mesh" Proc.lnt.Conf.on High Pressure Sci. and Tech.(in Press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tetsuyuki, HIROE: "Dynamic Behavior of Materials Induced by Explosive Loadings Initiated Using Wire Explosion Techniques" Proc.lnt.Workshop on lnd.Appl.of Explosion, Shock Wave and Figh Press. Phenomena. (in Press.).

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

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Published: 1999-03-16  

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