Breaking of window glass close to fire

Olavi Keski-Rahkonen

Research output: Contribution to journalArticleScientificpeer-review

83 Citations (Scopus)

Abstract

A heat conduction equation with linerized radiation cooling boundary conditions is used to calculate the thermal field in a long‐strip window pane heated by thermal radiation (fire), except on narrow strips along edges built into the frame.
This temperature field is used to calculate a quasi‐static thermal stress field in the pane in the first‐order planar stress approximation. Derived analytic equations of stresses are presented graphically. Thermal stresses build up at the edges in a narrow strip of a few times the pane thickness. In cool spots of the order of 100 K lower than the average temperature, stress build‐up can cause a microcrack to become a fast‐propagating fracture.
Original languageEnglish
Pages (from-to)61-69
JournalFire and Materials
Volume12
DOIs
Publication statusPublished - 1988
MoE publication typeNot Eligible

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Fires
Thermal stress
Glass
Heat radiation
Microcracks
Heat conduction
Temperature distribution
Boundary conditions
Cooling
Radiation
Temperature
Hot Temperature

Cite this

Keski-Rahkonen, Olavi. / Breaking of window glass close to fire. In: Fire and Materials. 1988 ; Vol. 12. pp. 61-69.
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Breaking of window glass close to fire. / Keski-Rahkonen, Olavi.

In: Fire and Materials, Vol. 12, 1988, p. 61-69.

Research output: Contribution to journalArticleScientificpeer-review

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N2 - A heat conduction equation with linerized radiation cooling boundary conditions is used to calculate the thermal field in a long‐strip window pane heated by thermal radiation (fire), except on narrow strips along edges built into the frame. This temperature field is used to calculate a quasi‐static thermal stress field in the pane in the first‐order planar stress approximation. Derived analytic equations of stresses are presented graphically. Thermal stresses build up at the edges in a narrow strip of a few times the pane thickness. In cool spots of the order of 100 K lower than the average temperature, stress build‐up can cause a microcrack to become a fast‐propagating fracture.

AB - A heat conduction equation with linerized radiation cooling boundary conditions is used to calculate the thermal field in a long‐strip window pane heated by thermal radiation (fire), except on narrow strips along edges built into the frame. This temperature field is used to calculate a quasi‐static thermal stress field in the pane in the first‐order planar stress approximation. Derived analytic equations of stresses are presented graphically. Thermal stresses build up at the edges in a narrow strip of a few times the pane thickness. In cool spots of the order of 100 K lower than the average temperature, stress build‐up can cause a microcrack to become a fast‐propagating fracture.

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