Stress resistance parameters of brittle solids under laser/plasma pulse heating
Identifieur interne : 00C122 ( Main/Exploration ); précédent : 00C121; suivant : 00C123Stress resistance parameters of brittle solids under laser/plasma pulse heating
Auteurs : V. N. Gurarie [Australie]Source :
- Materials science & engineering. A, Structural materials : properties, microstructure and processing [ 0921-5093 ] ; 2000.
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- Pascal (Inist)
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Abstract
The present study analyses the stress and fracture response of brittle materials under the effect of high-power pulse laser/plasma sources. It establishes the relationship between the material properties and the degree of fracture damage and threshold loading parameters which initiate fracture. The crack stability is analyzed using the generalized fracture mechanics approach for a non-uniform stress distribution. The thermal stress field is determined using a quasi-static thermomechanical diagram appropriate for a pulsed heating under a uniaxial temperature variation. The stress intensity factor is calculated for a crack propagating in the stressed layer considered to be much smaller compared to the body dimensions. The calculations show that stress intensity versus crack length curves display maxima which allow one to determine the critical conditions under which the existing cracks start to propagate and the advancing cracks are arrested. The results are used to evaluate the thermal stress resistance and the degree of fracture damage as a function of thermal and mechanical properties of materials and the intensity and duration of thermal shock loading. The critical temperature variation within which the crack stability is independent of the crack size is established. The relation of this parameter to the thermomechanical properties of materials is discussed.
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N." last="Gurarie">V. N. Gurarie</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>School of Physics, MARC, University of Melbourne</s1><s2>Parkville, Vic, 3010</s2><s3>AUS</s3><sZ>1 aut.</sZ></inist:fA14><country>Australie</country><placeName><settlement type="city">Melbourne</settlement><region type="état">Victoria (État)</region></placeName><orgName type="university">Université de Melbourne</orgName></affiliation></author></analytic><series><title level="j" type="main">Materials science & engineering. A, Structural materials : properties, microstructure and processing</title><title level="j" type="abbreviated">Mater. sci. eng. A Struct. mater. prop. microstruct. proces.</title><idno type="ISSN">0921-5093</idno><imprint><date when="2000">2000</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Materials science & engineering. A, Structural materials : properties, microstructure and processing</title><title level="j" type="abbreviated">Mater. sci. eng. A Struct. mater. prop. microstruct. proces.</title><idno type="ISSN">0921-5093</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Brittle fracture</term><term>Brittle material</term><term>Crack length</term><term>Crack propagation</term><term>Cracks</term><term>Damage</term><term>Laser-radiation heating</term><term>Mechanical strength</term><term>Plasma heating</term><term>Rupture strength</term><term>Stress distribution</term><term>Stress intensity factors</term><term>Thermal stresses</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Résistance mécanique</term><term>Résistance rupture</term><term>Rupture fragile</term><term>Contrainte thermique</term><term>Chauffage laser</term><term>Chauffage plasma</term><term>Distribution contrainte</term><term>Propagation fissure</term><term>Facteur intensité contrainte</term><term>Endommagement</term><term>Matériau fragile</term><term>6220M</term><term>Fissure</term><term>Longueur fissure</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The present study analyses the stress and fracture response of brittle materials under the effect of high-power pulse laser/plasma sources. It establishes the relationship between the material properties and the degree of fracture damage and threshold loading parameters which initiate fracture. The crack stability is analyzed using the generalized fracture mechanics approach for a non-uniform stress distribution. The thermal stress field is determined using a quasi-static thermomechanical diagram appropriate for a pulsed heating under a uniaxial temperature variation. The stress intensity factor is calculated for a crack propagating in the stressed layer considered to be much smaller compared to the body dimensions. The calculations show that stress intensity versus crack length curves display maxima which allow one to determine the critical conditions under which the existing cracks start to propagate and the advancing cracks are arrested. The results are used to evaluate the thermal stress resistance and the degree of fracture damage as a function of thermal and mechanical properties of materials and the intensity and duration of thermal shock loading. The critical temperature variation within which the crack stability is independent of the crack size is established. The relation of this parameter to the thermomechanical properties of materials is discussed.</div></front></TEI><affiliations><list><country><li>Australie</li></country><region><li>Victoria (État)</li></region><settlement><li>Melbourne</li></settlement><orgName><li>Université de Melbourne</li></orgName></list><tree><country name="Australie"><region name="Victoria (État)"><name sortKey="Gurarie, V N" sort="Gurarie, V N" uniqKey="Gurarie V" first="V. N." last="Gurarie">V. N. Gurarie</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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