期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 195, 期 -, 页码 13-27出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2020.03.010
关键词
Crack layer theory; High density polyethylene; Stochastic analysis; Slow crack growth; Birnbaum-Saunders distribution function
类别
资金
- Technology Innovation Program Project of Korea Evaluation Institute of Industrial Technology (KEIT) - Ministry of Trade, Industry & Energy (MI, Korea) [10076562]
- K-CLOUD research project - Korea Hydro & Nuclear Power Co. LTD. [2017-Technology-15]
High-density polyethylene exhibits discontinuous slow crack growth (SCG) mode in fatigue and creep conditions. To simulate the unique SCG mode, the crack layer (CL) theory can be adopted as an alternative method. However, the stochastic approach is also required for reliability-related problems. In this study, the current deterministic CL model was modified to describe the stochastic discontinuous SCG. First, the influence of the normally distributed nine input parameters in CL simulation on discontinuous SCG kinetics and the resulting lifetime distributions were thoroughly investigated. Second, important CL parameters that affect discontinuous SCG kinetics and the final lifetimes were identified. Then, the 2- and 3-parameter Weibull function and the Birnbaum-Saunders (B-S) function were compared to determine the function that correctly fits the lifetime distribution from discontinuous SCG. Finally, appropriate equations of the scale and shape parameters of the B-S function were developed with regard to the identified parameters. (C) 2020 Elsevier Ltd. All rights reserved.
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