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Reliability and Limitations of Compression Testing of Various Biomaterials

Jokinen, Viivi (2017)

 
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Jokinen, Viivi
2017

Biotekniikka
Teknis-luonnontieteellinen tiedekunta – Faculty of Natural Sciences
This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.
Hyväksymispäivämäärä
2017-08-16
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Julkaisun pysyvä osoite on
http://urn.fi/URN:NBN:fi:tty-201708241767
Tiivistelmä
Tissue-engineered scaffolds should mimic, as closely as possible, the one of the tissues to be replaced. Hence, mechanical tests are of paramount importance. However, as there are various biomaterials, with distinct mechanical properties, performing a conventional compression test is complicated. The objective of this thesis was to study the reliability and limitations of static conventional compression test and compression testing device. Accuracy and reproducibility of the compression tests were considered. The results showed that the compressive properties are dependent on many factors (sample size, microstructure, etc.). Biomaterial’s properties, such as viscoelasticity and brittleness, complicated the compression test and hampered the reliability. Fixed uniaxial compressive platen led to uneven load distribution on sample cross-section area. Careful sample preparation, surface finish or self-aligning platen could improve the reliability. The testing device showed good reproducibility, and accuracy for compressive strength. However, compressive modulus underestimated the results by > 34 %. The strain was measured from the platen displacement that may have caused error in strain measurements. With an optical extensometer, strain could be measured precisely from the center part of the sample. In conclusion, the accuracy and reproducibility of conventional compression test are questionable. The compression test should be performed with caution.
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Kalevantie 5
PL 617
33014 Tampereen yliopisto
oa[@]tuni.fi | Yhteydenotto | Tietosuoja | Saavutettavuusseloste