A procedure to account for machine stiffness in uni-axial compression tests
It is well established that test machine stiffness can influence the results in uni-axial compression tests on ice. This comes about because the conventional compression machines are not substantially stiffer than the piece of ice under test; hence the test becomes a complicated ice- structure inter...
| Main Authors: | , |
|---|---|
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
1984
|
| Subjects: | |
| Online Access: | https://nrc-publications.canada.ca/eng/view/ft/?id=d8b7148a-0a29-41ef-8bc9-b37bcb113a44 https://nrc-publications.canada.ca/eng/view/object/?id=d8b7148a-0a29-41ef-8bc9-b37bcb113a44 https://nrc-publications.canada.ca/fra/voir/objet/?id=d8b7148a-0a29-41ef-8bc9-b37bcb113a44 |
| Summary: | It is well established that test machine stiffness can influence the results in uni-axial compression tests on ice. This comes about because the conventional compression machines are not substantially stiffer than the piece of ice under test; hence the test becomes a complicated ice- structure interaction process. In this note, a simple model of this process is outlined and the defining equations are established. This yields a correction formula which accounts for the stiffness of the test machine. The model is checked for both columnar freshwater ice and granular sea ice by comparing the corrected strength values for three different test machines with those measured using a high-capacity closed-loop test machine. Il est bien connu que la rigidité des machines d'essai peut fausser les résultats des essais de compression uniaxiale de la glace. Cela provient du fait que les machines d'essai de compression conventionnelles ne sont pas suffisamment plus rigides que l'échantillon de glace soumis aux essais. Il en résulte donc un processus complexe d'interaction entre la machine et la glace. Cette communication présente un modèle simple de ce processus et les équations déterminantes. On obtient ainsi une formule correctrice qui permet de tenir compte de la rigidité de la machine. Le modèle est vérifié avec des échantillons de glace columnaire d'eau douce et de glace granulaire d'eau de mer en comparant les valeurs des résistances corrigées pour trois machines d'essai différentes avec celles obtenues en utilisant une machine d'essai à circuit fermé de forte capacité. Authors affiliated with the NRC Division of Building Research at time of publication Also published as a reprint, DBR paper no. 1294 (issn: 0381-4319) Peer reviewed: Yes NRC publication: Yes |
|---|