IMECH-IR  > 力学所知识产出(1956-2008)
Weibull modulus for diverse strength due to sample-specificity
Bai YL(白以龙); Wei YJ(魏宇杰); Xia MF(夏蒙棼); Ke FJ(柯孚久); Bai, YL (reprint author), Chinese Acad Sci, Inst Mech, Lab Nonlinear Mech, Beijing 100080, Peoples R China.
Source PublicationTheoretical and Applied Fracture Mechanics
AbstractBy sample specificity it is meant that specimens with the same nominal material parameters and tested under the same environmental conditions may exhibit different behavior with diversified strength. Such an effect has been widely observed in the testing of material failure and is usually attributed to the heterogeneity of material at the mesoscopic level. The degree with which mesoscopic heterogeneity affects macroscopic failure is still not clear. Recently, the problem has been examined by making use of statistical ensemble evolution of dynamical system and the mesoscopic stress re-distribution model (SRD). Sample specificity was observed for non-global mean stress field models, such as the duster mean field model, stress concentration at tip of microdamage, etc. Certain heterogeneity of microdamage could be sensitive to particular SRD leading to domino type of coalescence. Such an effect could start from the microdamage heterogeneity and then be magnified to other scale levels. This trans-scale sensitivity is the origin of sample specificity. The sample specificity leads to a failure probability Phi (N) with a transitional region 0 < (N) < 1, so that globally stable and catastrophic modes could co-exist. It is found that the scatter in strength can fit the Weibull distribution very well. Hence, the Weibull modulus is indicative of sample specificity. Numerical results obtained from the SRD for different non-global mean stress fields show that Weibull modulus increases with increasing sample span and influence region of microdamage.
Subject Area力学
Indexed BySCI
WOS IDWOS:000090120900003
WOS Research AreaEngineering ; Mechanics
WOS SubjectEngineering, Mechanical ; Mechanics
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorBai, YL (reprint author), Chinese Acad Sci, Inst Mech, Lab Nonlinear Mech, Beijing 100080, Peoples R China.
Recommended Citation
GB/T 7714
Bai YL,Wei YJ,Xia MF,et al. Weibull modulus for diverse strength due to sample-specificity[J]. Theoretical and Applied Fracture Mechanics,2000,34(3):211-216.
APA 白以龙,魏宇杰,夏蒙棼,柯孚久,&Bai, YL .(2000).Weibull modulus for diverse strength due to sample-specificity.Theoretical and Applied Fracture Mechanics,34(3),211-216.
MLA 白以龙,et al."Weibull modulus for diverse strength due to sample-specificity".Theoretical and Applied Fracture Mechanics 34.3(2000):211-216.
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