Finite ice failure depth in penetration of a vertical indentor into an ice edge

Tuomo Kärnä

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

This paper presents a partial analysis of data from an extensive series of laboratory indentation tests. The tests were conducted using flat indentors pushing against sheets of fresh-water ice of thickness 65 to 115 mm. The aspect ratio ranged from 0.9 to 2.6 with indentor velocities of 10 to 80 mm s−1. Details of an ice failure mode known as “crushing with flaking” are studied by making use of measured force-displacement signals and high-speed photography. With these test conditions, ice failure is associated with a production of symmetrical flakes which emanate simultaneously up and down. The failure begins in the middle level of the ice sheet as a rapid expansion of the ice. The post-peak phase of the ice failure involves loss ol the ice material over the whole contact area. The amount of ice that is extruded after the occurrence of the peak force is characterized by a finite failure depth parameter. According to present data, this failure depth is around 70% of the total depth of crushing and flaking that occur during a cycle of loading and unloading.
Original languageEnglish
Pages (from-to)114-120
Number of pages7
JournalAnnals of Glaciology
Volume19
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

Fingerprint

penetration
ice
crushing
indentation
photography
unloading
ice sheet
test
water

Cite this

@article{546a8bf5dd1f429085ac332f1ae63e99,
title = "Finite ice failure depth in penetration of a vertical indentor into an ice edge",
abstract = "This paper presents a partial analysis of data from an extensive series of laboratory indentation tests. The tests were conducted using flat indentors pushing against sheets of fresh-water ice of thickness 65 to 115 mm. The aspect ratio ranged from 0.9 to 2.6 with indentor velocities of 10 to 80 mm s−1. Details of an ice failure mode known as “crushing with flaking” are studied by making use of measured force-displacement signals and high-speed photography. With these test conditions, ice failure is associated with a production of symmetrical flakes which emanate simultaneously up and down. The failure begins in the middle level of the ice sheet as a rapid expansion of the ice. The post-peak phase of the ice failure involves loss ol the ice material over the whole contact area. The amount of ice that is extruded after the occurrence of the peak force is characterized by a finite failure depth parameter. According to present data, this failure depth is around 70{\%} of the total depth of crushing and flaking that occur during a cycle of loading and unloading.",
author = "Tuomo K{\"a}rn{\"a}",
year = "1994",
doi = "10.3189/1994AoG19-1-114-120",
language = "English",
volume = "19",
pages = "114--120",
journal = "Annals of Glaciology",
issn = "0260-3055",
publisher = "Cambridge University Press",

}

Finite ice failure depth in penetration of a vertical indentor into an ice edge. / Kärnä, Tuomo.

In: Annals of Glaciology, Vol. 19, 1994, p. 114-120.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Finite ice failure depth in penetration of a vertical indentor into an ice edge

AU - Kärnä, Tuomo

PY - 1994

Y1 - 1994

N2 - This paper presents a partial analysis of data from an extensive series of laboratory indentation tests. The tests were conducted using flat indentors pushing against sheets of fresh-water ice of thickness 65 to 115 mm. The aspect ratio ranged from 0.9 to 2.6 with indentor velocities of 10 to 80 mm s−1. Details of an ice failure mode known as “crushing with flaking” are studied by making use of measured force-displacement signals and high-speed photography. With these test conditions, ice failure is associated with a production of symmetrical flakes which emanate simultaneously up and down. The failure begins in the middle level of the ice sheet as a rapid expansion of the ice. The post-peak phase of the ice failure involves loss ol the ice material over the whole contact area. The amount of ice that is extruded after the occurrence of the peak force is characterized by a finite failure depth parameter. According to present data, this failure depth is around 70% of the total depth of crushing and flaking that occur during a cycle of loading and unloading.

AB - This paper presents a partial analysis of data from an extensive series of laboratory indentation tests. The tests were conducted using flat indentors pushing against sheets of fresh-water ice of thickness 65 to 115 mm. The aspect ratio ranged from 0.9 to 2.6 with indentor velocities of 10 to 80 mm s−1. Details of an ice failure mode known as “crushing with flaking” are studied by making use of measured force-displacement signals and high-speed photography. With these test conditions, ice failure is associated with a production of symmetrical flakes which emanate simultaneously up and down. The failure begins in the middle level of the ice sheet as a rapid expansion of the ice. The post-peak phase of the ice failure involves loss ol the ice material over the whole contact area. The amount of ice that is extruded after the occurrence of the peak force is characterized by a finite failure depth parameter. According to present data, this failure depth is around 70% of the total depth of crushing and flaking that occur during a cycle of loading and unloading.

U2 - 10.3189/1994AoG19-1-114-120

DO - 10.3189/1994AoG19-1-114-120

M3 - Article

VL - 19

SP - 114

EP - 120

JO - Annals of Glaciology

JF - Annals of Glaciology

SN - 0260-3055

ER -