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ASTM E671-98(2016)
Standard Specification for Maximum Permissible Thermal Residual Stress in Annealed Glass Laboratory Apparatus
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Разработчик:
Зарубежные/ASTM
ICS:
71.040.20 Laboratory ware and related apparatus / Лабораторная посуда и сопутствующая аппаратура
Сборник (ASTM):
14.04 Laboratory Apparatus; Degradation of Materials; SI; Oxygen Fire Safety / Лабораторная аппаратура; деградация материалов; международная система единиц СИ; кислород и пожарная безопасность
Тематика:
Laboratory Testing
Описание
Реферат

This specification covers a limit for thermal residual stress in reusable annealed glass laboratory apparatus as determined by prescribed photoelastic measurement procedures. This specification recognizes that photoelastic measurements are proportional to the difference of the principal stresses. The stress limit shall be measured and calculated to meet the specified requirements.

Область применения

1.1 Thisspecification covers a limit for thermal residual stress inreusable annealed glass laboratory apparatus as determined byprescribed photoelastic measurement procedures.

1.2 Inbroad classification, the laboratory glassware items covered bythis specification, but not limited to, are:

beakers

Imhoffcones

bottles,aspirator

impingers

bottles,dropping

jars,battery

bottles, gaswashing

jars,bell

bottles,infusion

jars,chromatography

bottles, milktest

jars,cylindrical

bottles,reagent

joints, balland socket or standard taper

bottles,weighing

manometers

bulbs,absorption

percolators

bulbs,leveling

pycnometers

bulbs,sampling

stopcocks

burets

tubes,centrifuge

condensers

tubes,chromatography

crystallizingdishes

tubes, colorcomparison (turbidity)

culturedishes

tubes,combustion (ignition)

customapparatus

tubes,connecting and adapter

cylinders,graduated

tubes,digestion

 andplain

tubes,drying

desiccators

tubes,fermentation

extractiontubes

tubes,thistle (spray traps)

flasks

vaportraps

frittedware

viscometers

funnels

watchglasses

generators,Kipp

grinder,tissue

1.3 Thisspecification recognizes that photoelastic measurements areproportional to the difference of the principal stresses. The limitimposed represents a safety factor to cover a situation in whichone of the principal stresses may be larger than the apparentstress.

1.4 Thisspecification applies only to annealed glassware that is intendedfor sale as such. It excludes glassware that has been thermallytempered, ion-exchanged, or laminated with glass layers ofdiffering expansion. The intent of this specification is to limitthe residual stresses for safe consumer use in annealed glass, asit leaves the manufacturer.

1.5Stresses introduced by thermal expansion differences within theglassware are covered by this specification. Graded andglass-to-metal seals are excluded.

Ключевые слова:
annealed glass; residual; stress ;;