A novel technique for the fabrication of laboratory scale model functionally graded materials

J. Lambros, M. H. Santare, H. Li, G. H. Sapna

Research output: Contribution to journalArticlepeer-review


In this work, the authors describe the design, fabrication and testing of model functionally graded materials (FGMs). The inhomogeneous property variations were generated by altering material properties through selective ultraviolet (UV) irradiation. Poly(ethylene co-carbon monoxide) (ECO) was chosen to make the FGMs because of its rapid degradation under UV light. Irradiated ECO becomes stiffer, stronger and more brittle with increasing irradiation time. Through a series of tension tests, the authors characterized the mechanical behavior of the specific ECO used as a function of UV exposure time. Furthermore, by controlling exposure time, specimens with continuously and discretely varying mechanical properties were produced. The resulting graded materials exhibited a Young's modulus that varied from about 160 MPa to 250 MPa and a strain to failure that varied from about 900 percent to 10 percent over the width in a 150 mm wide specimen. Microhardness measurements were used to determine the differences between discretely and continuously varying mechanical properties.

Original languageEnglish (US)
Pages (from-to)184-190
Number of pages7
JournalExperimental Mechanics
Issue number3
StatePublished - Sep 1999
Externally publishedYes


  • Functionally graded materials
  • Mechanical properties
  • Polyethylene
  • Ultraviolet irradiation

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering


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