Comparative assessment of fracture toughness data using diverse statistical distributions
The Weibull distribution has been widely used to investigate cleavage fracture of structural components,of which immanent weakest link theory assumes that failure could occur anywhere. However,the volume element concept employed in the Weibull stress model is inappropriate when local failure at an arbitrary element does not reach to global failure of material. It means that materials possess more load carrying capacities due to stronger volume elements nearby the weakest one. In the present research,to deal with this volume element independence issue,alternative statistical distributions are introduced; Neville and Kennedys distribution relating failure-prone volume to probability of failure,newly proposed Burr type Ⅻ and Burr type Ⅲ distributions. A series of statistical assessment on cleavage fracture toughness test data for a representative pressure vessel material is carded out using the alternative distributions and its results are compared with those obtained from the Weibull distribution. Pros and corns of the alternative distributions as well as technical findings derived from the assessment are fully discussed to show applicability of them.
Brittle fracture Burr type distributions Fracture toughness Statistical analysis
Han-Ok Ko Yoon-Suk Chang Young-Jin Kim Min-Chul Kim Bong-Sang Lee
School of Mechanical Engineering,Sungkyunkwan University,300 Chunchun-dong,Jangan-gu,Suwon,Gyeonggi- School of Mechanical ngineering,Sungkyunkwan University,300 Chunchun-dong,Jangan-gu,Suwon,Gyeonggi-d Korea Atomic Energy Research Institute,PO Box 105,Yuseong-gu,Daejeon 305-600,Korea
国际会议
Fracture Mechanics and Applications 2008(国际断裂力学2008年年会)(FM2008)
杭州
英文
63-68
2008-10-31（万方平台首次上网日期，不代表论文的发表时间）