{"title":"经表面机械轧制处理和不经表面机械轧制处理的高强铝合金高周至甚高周疲劳过渡区疲劳特性","authors":"Zepeng Liu, Jialong Li, Li Zhang","doi":"10.1016/j.engfracmech.2025.111585","DOIUrl":null,"url":null,"abstract":"<div><div>In the present work, the <em>S-N</em> curve and failure mode characteristics of 7075-T651 high-strength aluminum alloy specimens with and without surface mechanical rolling treatment (SMRT) was investigated under uniaxial symmetric fatigue tests (<em>R</em> = -1) at room temperature. The research results showed that the <em>S-N</em> curve of Al alloy specimens treated by SMRT presented smooth and continuous characteristics, and three fatigue failure modes of S-mode (surface failure), Int-mode (internal failure without FGA) and IFGA-mode (internal failure with FGA) were discovered depending on applied stress amplitude level. The original 7075-T651 specimens contained two failure modes of S-mode and IFGA-mode, and the <em>S-N</em> curve showed a step-wise characteristic. The reasons for the transition of the failure mode in transition regime between high cycle (HCF) and very-high cycle fatigue (VHCF) was researched based on the stress intensity factor range (Δ<em>K</em>). Furthermore, Paris-Hertzberg law was used to calculate the fatigue crack growth life of different failure modes.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"328 ","pages":"Article 111585"},"PeriodicalIF":5.3000,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Fatigue characteristics of high-strength aluminum alloy with and without surface mechanical rolling treatment in the transition regime between high cycle and very-high cycle fatigue\",\"authors\":\"Zepeng Liu, Jialong Li, Li Zhang\",\"doi\":\"10.1016/j.engfracmech.2025.111585\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>In the present work, the <em>S-N</em> curve and failure mode characteristics of 7075-T651 high-strength aluminum alloy specimens with and without surface mechanical rolling treatment (SMRT) was investigated under uniaxial symmetric fatigue tests (<em>R</em> = -1) at room temperature. The research results showed that the <em>S-N</em> curve of Al alloy specimens treated by SMRT presented smooth and continuous characteristics, and three fatigue failure modes of S-mode (surface failure), Int-mode (internal failure without FGA) and IFGA-mode (internal failure with FGA) were discovered depending on applied stress amplitude level. The original 7075-T651 specimens contained two failure modes of S-mode and IFGA-mode, and the <em>S-N</em> curve showed a step-wise characteristic. The reasons for the transition of the failure mode in transition regime between high cycle (HCF) and very-high cycle fatigue (VHCF) was researched based on the stress intensity factor range (Δ<em>K</em>). Furthermore, Paris-Hertzberg law was used to calculate the fatigue crack growth life of different failure modes.</div></div>\",\"PeriodicalId\":11576,\"journal\":{\"name\":\"Engineering Fracture Mechanics\",\"volume\":\"328 \",\"pages\":\"Article 111585\"},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2025-09-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Engineering Fracture Mechanics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0013794425007866\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MECHANICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Engineering Fracture Mechanics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0013794425007866","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}
Fatigue characteristics of high-strength aluminum alloy with and without surface mechanical rolling treatment in the transition regime between high cycle and very-high cycle fatigue
In the present work, the S-N curve and failure mode characteristics of 7075-T651 high-strength aluminum alloy specimens with and without surface mechanical rolling treatment (SMRT) was investigated under uniaxial symmetric fatigue tests (R = -1) at room temperature. The research results showed that the S-N curve of Al alloy specimens treated by SMRT presented smooth and continuous characteristics, and three fatigue failure modes of S-mode (surface failure), Int-mode (internal failure without FGA) and IFGA-mode (internal failure with FGA) were discovered depending on applied stress amplitude level. The original 7075-T651 specimens contained two failure modes of S-mode and IFGA-mode, and the S-N curve showed a step-wise characteristic. The reasons for the transition of the failure mode in transition regime between high cycle (HCF) and very-high cycle fatigue (VHCF) was researched based on the stress intensity factor range (ΔK). Furthermore, Paris-Hertzberg law was used to calculate the fatigue crack growth life of different failure modes.
期刊介绍:
EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.