Fracture in metal powder compaction

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This paper presents a preliminary assessment and qualitative analysis on fracture criterion and crack growth in metal powder compact during the cold compaction process. Based on the fracture criterion of granular materials in compression, a displacement based finite element model has been developed to analyse fracture initiation and crack growth in metal powder compact. Approximate estimation of fracture toughness variation with relative density is established in order to provide the fracture parameter as compaction proceed. A single crack initiated from the boundary of a multi-level component made of iron powder is considered in this work. The finite element simulation of the crack propagation indicates that shear crack grows during the compaction process and propagates in the direction of higher shear stress and higher relative density. This also implies that the crack grows in the direction where the compaction pressure is much higher, which is in line with the conclusion made by previous researchers on shear crack growth in materials under compression. In agreement with reported work by previous researchers, high stress concentration and high density gradient at the inner corner in multi-level component results in fracture of the component during preparation.

Original languageEnglish
Pages (from-to)1528-1542
Number of pages15
JournalInternational Journal of Solids and Structures
Volume43
Issue number6
DOIs
Publication statusPublished - Mar 2006

Fingerprint

metal powder
Powder metals
Compaction
Powder
cracks
Metals
Crack Growth
Crack propagation
Crack
Cracks
Compression
Fracture Toughness
Stress Concentration
Granular Materials
shear
Crack Propagation
Finite Element Simulation
Qualitative Analysis
Iron powder
Shear Stress

Keywords

  • Finite element
  • Fracture criteria
  • Powder compact
  • Shear crack

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Fracture in metal powder compaction. / Tahir, S. M.; Mohd Ihsan, Ahmad Kamal Ariffin.

In: International Journal of Solids and Structures, Vol. 43, No. 6, 03.2006, p. 1528-1542.

Research output: Contribution to journalArticle

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