Fatigue crack initiation and propagation in lotus-type porous copper

Hironori Seki, Masakazu Tane, Hideo Nakajima

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We studied fatigue crack initiation and propagation in lotus-type porous copper with cylindrical pores aligned in one direction. For fatigue loadings in the direction parallel to the longitudinal axis of pores, stress field in the matrix is homogeneous. Therefore, slip bands are formed all over the specimen surface. On the other hand, for the perpendicular loadings, slip bands are formed only around pores in which stress highly concentrates. Since the localized slip bands form fatigue crack, fatigue fracture occurs even when the total plastic strain range is small. Stress field in the matrix of lotus copper affects the direction of crack propagation. For the parallel loadings, a crack propagates along a straight line as well as nonporous copper. On the other hand, for the perpendicular loading, a crack propagates along a path in which stress highly concentrates. Since stress highly concentrates around anomalously large pores, fatigue cracks are preferentially formed around the large pores and cracks propagate by crossing the large pores.

Original languageEnglish
Pages (from-to)144-150
Number of pages7
JournalMaterials Transactions
Volume49
Issue number1
DOIs
Publication statusPublished - 2008 Jan
Externally publishedYes

Keywords

  • Anisotropy
  • Copper
  • Crack
  • Fatigue
  • Porosity
  • Porous metals

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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