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首页> 外文期刊>Engineering failure analysis >Improving the fatigue strength of a multiple hole specimen by applying additional holes or notches
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Improving the fatigue strength of a multiple hole specimen by applying additional holes or notches

机译：通过施加更多的孔或缺口来提高多孔样品的疲劳强度

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摘要

A series of tests were conducted in aluminum alloy 2024-T3 to investigate the effect of additional holes and notches on the fatigue behavior of double hole specimens. Also, circular pins were inserted into the additional holes, but not removed before testing in some cases. Basic specimen has dual holes and their cracks interacted with the specimen edge. Within the present study conditions, the longest fatigue life was observed where dual holes had a shorter distance between their edges and a longer distance from specimen edge to holes. The shortest fatigue life was observed where there was a longer distance between the hole edges. This paper describes how the improvement of fatigue life in the shorter life case of a basic specimen was examined by applying additional holes or notches. The crack initiation and growth behavior was observed and the mechanism of the extension of the fatigue life was investigated. The finite element method (FEM) was used to analyze the stress concentration around the basic dual holes, additional holes and notches in the present specimens. Then it was discussed how the reduction of stress concentration around the basic dual holes affected the fatigue life of the double holed specimens. A method of enhancement of fatigue life of notched material is discussed in the present study.
机译：在铝合金2024-T3中进行了一系列测试，以研究额外的孔和缺口对双孔试样疲劳行为的影响。另外，在某些情况下，圆形销钉已插入其他孔中，但未在测试前将其卸下。基本标本具有双孔，其裂纹与标本边缘相互作用。在目前的研究条件下，观察到最长的疲劳寿命，其中双孔的边缘之间的距离较短，而从试样边缘到孔的距离较长。在孔边缘之间的距离较长的情况下，观察到了最短的疲劳寿命。本文介绍了如何通过增加孔或槽口来检查基本样品寿命较短时疲劳寿命的改善。观察了裂纹的萌生和扩展行为，研究了疲劳寿命延长的机理。使用有限元方法（FEM）来分析当前试样中基本双孔，附加孔和缺口周围的应力集中。然后讨论了基本双孔周围应力集中的减少如何影响双孔试样的疲劳寿命。在本研究中讨论了一种提高缺口材料疲劳寿命的方法。

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