Fatigue of foam core sandwich beams—1: undamaged specimens

The present paper addresses the fatigue characteristics of two cellular foam core materials as used in load carrying sandwich structures. The fatigue loading studied is a constant shear stress which corresponds to the main type of loading that the core in a sandwich structure exhibits. Based on resu...

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Bibliographic Details
Published in:International journal of fatigue 1997-10, Vol.19 (7), p.551-561
Main Authors: Burman, M, Zenkert, D
Format: Article
Language:English
Subjects:
Applied sciences
Cellular
cellular foam
crack growth
crack initiation
Exact sciences and technology
fatigue
Forms of application and semi-finished materials
Haigh diagram
load ratio
PMI
Polymer industry, paints, wood
PVC
sandwich construction
Technology of polymers
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Summary:The present paper addresses the fatigue characteristics of two cellular foam core materials as used in load carrying sandwich structures. The fatigue loading studied is a constant shear stress which corresponds to the main type of loading that the core in a sandwich structure exhibits. Based on results from testing stress-life curves are presented for a number of stress ratios ( R) and are fitted to a simple two-parameter Weibull function. The influence of the R-value is emphasized and standard Haigh diagrams are constructed. It is seen that the fatigue behaviour of the core materials investigated herein well can be described in manners similar to that of classical metal fatigue. A thorough investigation is performed on the behaviour of fatigue crack formation and growth.
ISSN:0142-1123
1879-3452
DOI:10.1016/S0142-1123(97)00069-8