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所属单位：航空学院
发表刊物：INTERNATIONAL JOURNAL OF FATIGUE
关键字：Multiaxial fatigue Variable amplitude Critical plane Crack initiation plane Nonproportional loading
摘要：In the present investigation, the accuracy of two methods, i.e., the Shear Strain-Maximum Variance Method (gamma-MVM) and the Maximum Damage Method (MDM), in predicting the orientation of the crack initiation planes was checked by considering several results taken from the literature and generated by testing five different metallic materials under complex multiaxial loading. The gamma-MVM postulates that the critical plane is that material plane containing the direction experiencing the maximum variance of the resolved shear strain. In contrast, the MDM defines the critical plane as that material plane on which the accumulated damage reaches its maximum value. In the present investigation, the MDM was applied in conjunction with Fatemi-Socie's (FS) multiaxial fatigue criterion, Bannantine-Socie's (BS) cycle counting method, and Miner's linear rule. The validation exercise being performed demonstrated that both the gamma-MVM and the MDM were capable of accurately predicting the orientation of the crack initiation planes in the selected metals. Subsequently, the reliability of three different design methodologies suitable for estimating fatigue lifetime of metals subjected to variable amplitude multiaxial loading was assessed quantitatively by using a number of experimental results taken from the literature. In more detail, Methodology A was based on the MDM applied along with the FS criterion, the BS cycle counting method, and Miner's rule. Methodology B made use of the gamma-MVM, the FS criterion, the BS cycle counting method, and Miner's linear rule. Finally, Methodology C involved the gamma-MVM, the Modified Manson Coffin Curve Method (MMCCM), the classical Rain-Flow cycle counting method, and Miner's linear rule. According to this systematic validation exercise, the usage of these three design procedures was seen to result in satisfactory predictions, with the estimates falling within an error band of three. (C) 2016 Elsevier Ltd. All rights reserved.
ISSN号：0142-1123
是否译文：否
发表时间：2017-07-01
合写作者：Faruq, N. Zuhair,Susmel, Luca
通讯作者：王英玉