{"title":"Fracture life for constant load creep tests and relationship with fracture mechanisms","authors":"W. Beeré","doi":"10.1179/030634584790420294","DOIUrl":null,"url":null,"abstract":"AbstractThe theory of constant load uniaxial tests and constant pressure tube burst tests is compared with observed values of minimum creep rate e m and time to failure t f. It is shown that the product e m t f can exceed the asymptotic value 1/n (1/2n for tubes) at large failure strains, where n is the stress exponent for creep. A fracture model based on cavity growth mechanisms is developed for 20Cr-25Ni-Nb stainless steel. The predictions are compared with the observed values and related to the Monkman–Grant equation. It is shown that the constants in the latter equation incorporate the creep and failure mechanisms.","PeriodicalId":18750,"journal":{"name":"Metal science","volume":"42 1","pages":"85-91"},"PeriodicalIF":0.0000,"publicationDate":"1984-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metal science","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1179/030634584790420294","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
AbstractThe theory of constant load uniaxial tests and constant pressure tube burst tests is compared with observed values of minimum creep rate e m and time to failure t f. It is shown that the product e m t f can exceed the asymptotic value 1/n (1/2n for tubes) at large failure strains, where n is the stress exponent for creep. A fracture model based on cavity growth mechanisms is developed for 20Cr-25Ni-Nb stainless steel. The predictions are compared with the observed values and related to the Monkman–Grant equation. It is shown that the constants in the latter equation incorporate the creep and failure mechanisms.
摘要将恒载单轴试验和恒压爆破试验理论与最小蠕变速率e m和失效时间t f的观测值进行了比较。结果表明，在大破坏应变下，其乘积e m t f可以超过渐近值1/n(对于钢管为1/2n)，其中n为蠕变应力指数。建立了基于空腔生长机制的20Cr-25Ni-Nb不锈钢断裂模型。将预测值与观测值进行比较，并与Monkman-Grant方程相关联。结果表明，后一方程中的常数包含蠕变和破坏机制。
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