A New General Fatigue Limit Diagram and Its Application of Predicting Die Fatigue Life during Cold Forging
Traditional fatigue fracture theory and practice focus principally on structural design. It is thus too conservative and inappropriate when used to predict the high-cycle fatigue life of dies used for metal forming, especially cold forging. We propose a novel mean stress correction model and diagram...
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MDPI AG
2022-03-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/7/2351 |
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| author | Man-Soo Joun Su-Min Ji Wan-Jin Chung Gue-Serb Cho Kwang-Hee Lee |
| author_facet | Man-Soo Joun Su-Min Ji Wan-Jin Chung Gue-Serb Cho Kwang-Hee Lee |
| author_sort | Man-Soo Joun |
| collection | DOAJ |
| description | Traditional fatigue fracture theory and practice focus principally on structural design. It is thus too conservative and inappropriate when used to predict the high-cycle fatigue life of dies used for metal forming, especially cold forging. We propose a novel mean stress correction model and diagram to predict the high-cycle fatigue lives of cold forging dies, which focuses on the upper part of the equivalent fatigue strength curve. Considering the features of die materials characterized by high yield strength and low ductility, a straight line is assumed for the tensile yield line. To the contrary, a general curve is used to represent the fatigue strength. They are interpolated, based on the distance ratio, when finding an appropriate equivalent fatigue strength curve at the mean stress and stress amplitude between the line and curve. The approach is applied to a well-defined literature example to verify its validity and shed light on the characteristics of die fatigue life. The approach is also applied to practical forging and useful qualitative results are obtained. |
| first_indexed | 2024-03-09T11:41:41Z |
| format | Article |
| id | doaj.art-9af4a40178eb4d06b7a208e68613b081 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:41:41Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-9af4a40178eb4d06b7a208e68613b0812023-11-30T23:30:56ZengMDPI AGMaterials1996-19442022-03-01157235110.3390/ma15072351A New General Fatigue Limit Diagram and Its Application of Predicting Die Fatigue Life during Cold ForgingMan-Soo Joun0Su-Min Ji1Wan-Jin Chung2Gue-Serb Cho3Kwang-Hee Lee4Engineering Research Institute, School of Mechanical and Aerospace Engineering, Gyeongsang National University, Jinju 52828, Gyeongsangnam-do, KoreaGraduate School of Mechanical and Aerospace Engineering, Gyeongsang National University, Jinju 52828, Gyeongsangnam-do, KoreaDepartment of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 01811, Gyeonggi-do, KoreaAdvanced Process and Materials Group, Korea Institute of Industrial Technology, Incheon 21999, Gyeonggi-do, KoreaPungkang Co., Ltd., Hwaseong 18572, Gyeonggi-do, KoreaTraditional fatigue fracture theory and practice focus principally on structural design. It is thus too conservative and inappropriate when used to predict the high-cycle fatigue life of dies used for metal forming, especially cold forging. We propose a novel mean stress correction model and diagram to predict the high-cycle fatigue lives of cold forging dies, which focuses on the upper part of the equivalent fatigue strength curve. Considering the features of die materials characterized by high yield strength and low ductility, a straight line is assumed for the tensile yield line. To the contrary, a general curve is used to represent the fatigue strength. They are interpolated, based on the distance ratio, when finding an appropriate equivalent fatigue strength curve at the mean stress and stress amplitude between the line and curve. The approach is applied to a well-defined literature example to verify its validity and shed light on the characteristics of die fatigue life. The approach is also applied to practical forging and useful qualitative results are obtained.https://www.mdpi.com/1996-1944/15/7/2351cold forging diegeneral fatigue limit diagramhigh cycle fatigue fracturedie life predictionfatigue functional exponent |
| spellingShingle | Man-Soo Joun Su-Min Ji Wan-Jin Chung Gue-Serb Cho Kwang-Hee Lee A New General Fatigue Limit Diagram and Its Application of Predicting Die Fatigue Life during Cold Forging Materials cold forging die general fatigue limit diagram high cycle fatigue fracture die life prediction fatigue functional exponent |
| title | A New General Fatigue Limit Diagram and Its Application of Predicting Die Fatigue Life during Cold Forging |
| title_full | A New General Fatigue Limit Diagram and Its Application of Predicting Die Fatigue Life during Cold Forging |
| title_fullStr | A New General Fatigue Limit Diagram and Its Application of Predicting Die Fatigue Life during Cold Forging |
| title_full_unstemmed | A New General Fatigue Limit Diagram and Its Application of Predicting Die Fatigue Life during Cold Forging |
| title_short | A New General Fatigue Limit Diagram and Its Application of Predicting Die Fatigue Life during Cold Forging |
| title_sort | new general fatigue limit diagram and its application of predicting die fatigue life during cold forging |
| topic | cold forging die general fatigue limit diagram high cycle fatigue fracture die life prediction fatigue functional exponent |
| url | https://www.mdpi.com/1996-1944/15/7/2351 |
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