Fracture properties of potato crisps

F J Rojo, J F V Vincent

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The Weibull modulus of potato crisps is about 4, comparable with ceramic materials, with a characteristic strength of about 1.5 MPa. This combination of brittleness and weakness gives crispness. The critical stress intensity factor (K-IC) and the energy of fracture (R) are around 0.12 MPa root m and 45 J m(-2), respectively. There was no significant difference between the material values obtained for the fracture properties of crisps of a range of subjective 'crispness' as measured by a trained organoleptic panel. Crispness is ranked by the structural bending strength. Centrally loaded plate tests give qualitative evaluation of crispness. Both these tests could be used in quality control, with advantage over organoleptic tests such as cost, the time required, objectivity, consistency of results, the relation of the measured parameters to standard materials tests and the relatively small amount of material that is needed by comparison.
Original languageEnglish
Pages (from-to)752-760
Number of pages9
JournalInternational Journal of Food Science and Technology
Volume43
Issue number4
DOIs
Publication statusPublished - 2008

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