A generalized Gompertz model of reliability-dependent hazard rate for composites under cyclic stresses
| Autor: | Chen Chung-Ling, Wang Kuo-Shong |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Science and Engineering of Composite Materials, Vol 19, Iss 1, Pp 81-88 (2012) |
| Druh dokumentu: | article |
| ISSN: | 0792-1233 2191-0359 |
| DOI: | 10.1515/secm.2011.0068 |
| Popis: | This study aims to investigate the relation of hazard rate in terms of the corresponding reliability for composite laminates under constant-amplitude cyclic stresses when the static strength is described by the Weibull distribution and the S-N curve is given. On the basis of the strength-life equal rank assumption, Yang’s residual strength degradation model is considered to derive the reliability by retrieving the residual strengths to the initials. Thus, a reliability-dependent hazard rate function is proposed as h(R)=eg+μ(-ln R)ξ, where eg denotes the intrinsic weakness of composites during fabrication, μ the hazard scaling parameter, and ξ the curve trend parameter. Parameter eg can be assumed as a very small positive value. Both ξ and μ are connected to the shape parameter of the Weibull static strength distribution and the parameter of fatigue life distribution, and μ is correlated to a power function of the applied maximum cyclic stress. The proposed model can be reduced to either the Gompertz model as ξ=1 or the Weibull model when eg=0 and ξ |
| Databáze: | Directory of Open Access Journals |
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