Microscale residual strains in monolayer unidirectional fiber composites

Jay C. Hanan, Bjørn Clausen, Geoffrey A. Swift, Ersan Üstündag*, Irene J. Beyerlein, Jonathan D. Almer, Ulrich Lienert, Dean R. Haeffner

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


Thermal residual stress is common in fiber reinforced metal matrix composites and significantly affects their mechanical properties. The calculation of these stresses typically assumes continuum mechanics holds. As the fiber diameter in most composites approaches the grain size of the matrix, the continuum assumption can become invalid. Since the mechanical properties depend on the residual strain state of the composite, it is therefore necessary to determine the residual strains using spatially resolved microscale measurements. In order to quantify these residual strains, X-ray diffraction of both the fiber and matrix was employed using a sampling volume less than the fiber diameter. Results were compared to macroscopic measurements including many fibers. The measurements were performed in transmission using high-energy synchrotron X-rays yielding strains representative of the entire thickness of the composite. Evolution of these residual strains after application of load was also investigated. Spatial variations in residual strains showed significant deviation from the macroscopically observed residual strains.

Original languageEnglish
Pages (from-to)913-918
Number of pages6
JournalMaterials Science Forum
Publication statusPublished - 2002
Externally publishedYes
EventProceedings of the 6th European Conference on Residual Stresses - Coimbra, Portugal
Duration: 10 Jul 200212 Jul 2002


  • Metal matrix composites
  • Plastic anisotropy
  • Residual strains
  • SiC
  • Ti-6Al-4V
  • X-ray diffraction


Dive into the research topics of 'Microscale residual strains in monolayer unidirectional fiber composites'. Together they form a unique fingerprint.

Cite this