WO2002082054A1 - Procede de conception de materiau metallique presentant une resistance de longue duree a la fatigue - Google Patents
Procede de conception de materiau metallique presentant une resistance de longue duree a la fatigue Download PDFInfo
- Publication number
- WO2002082054A1 WO2002082054A1 PCT/JP2002/002281 JP0202281W WO02082054A1 WO 2002082054 A1 WO2002082054 A1 WO 2002082054A1 JP 0202281 W JP0202281 W JP 0202281W WO 02082054 A1 WO02082054 A1 WO 02082054A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stress
- area
- metal material
- fatigue strength
- inclusion
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/204—Structure thereof, e.g. crystal structure
- G01N33/2045—Defects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0212—Theories, calculations
- G01N2203/0218—Calculations based on experimental data
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
- G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
Definitions
- the present invention relates to a method for designing a long-life fatigue strength of a metal material used for a mechanical component to which a repetitive stress is applied for a long period of time, such as a transmission of an automobile, a spring, and a bearing of a vehicle.
- inclusions Non-metallic inclusions (hereinafter referred to as “inclusions”) in metal materials are one type of such defects. Therefore, in the conventional fatigue strength design, a method is adopted in which the stress concentration effect of inclusions is considered based on ⁇ FT, which is the square root of the area of the size of the inclusion that is the starting point of fatigue fracture.
- this inclusion has a function of trapping hydrogen in addition to stress concentration, and it is known that hydrogen in a metal affects the microscopic fracture mechanism of the metal in the material. This tendency is particularly remarkable in high strength steel.
- the area around the inclusions affected by hydrogen Since the surface is rough, it looks black when observed with a metallurgical microscope, and this area is called ODA (Optically Dark Area). Fatigue tests have shown that the trapped hydrogen reduces the fatigue strength around inclusions. This effect can be viewed as a religious aspect in which trapped hydrogen substantially increases the size of inclusions. 'However, as the effect of the trapped hydrogen results of investigation in detail by metal microscopic observation, rupture life is prolonged from about 10 5 to 10 8 or more, it has been found that ODA size increases.
- the conventional fatigue strength design is based on the initial dimensions of the inclusions, IFiT, so the optimal fracture life design is not based on the service life set for the mechanical parts.
- the present invention by considering the expansion of the DA dimension according to the expected service life of the mechanical parts, the long-life fatigue strength of the metal material that enables the design of the optimal mechanical parts according to the set service life Provide a design method. Disclosure of the invention
- Figure 1 shows the relationship between the size of inclusions trapped in hydrogen and the number of repetitions of stress up to fracture.
- the ⁇ DA area around the inclusion (A 0 ) shown in Fig. 1 (8 is the hydrogen-affected area.
- the dimensions of the inclusion that started the fracture are represented by the square root “area” of the area.
- the dimension of ⁇ DA increases as the life increases and the rupture occurs.
- the number of repetitions of stress to failure N ⁇ ⁇ ⁇ ⁇ is due to the high stress applied, and without the help of trapped hydrogen, the inclusion of fatigue cracks. This means that the occurrence and progress of the event led to the destruction.
- the stress is low, it may be possible to undergo many repetitions with the help of hydrogen. A crack is formed, and the progress is also helped by hydrogen. Then, after the applied stress alone increases the size of 0 DA to a size large enough to propagate the crack, fatigue crack growth occurs without the influence of hydrogen. Therefore, in the fatigue crack growth region outside of the ODA and not affected by hydrogen, a fatigue fracture surface different from that in 0 DA is formed.
- the inclusion expands the equivalent defect size, which is the size after expansion of the inclusion as an equivalent defect, due to the effect of hydrogen trapped by the inclusion itself due to repeated stress. Therefore, the extent to which the equivalent defect size increases depends on how long the service life of the mechanical parts to be designed is set and how many repetitions are assumed.
- the long-life fatigue strength design method of the present invention is a long-life fatigue strength design method for a metal material containing inclusions with hydrogen trapped around it.
- the second step is to use the assumed stress cycle on the N f axis of the graph. It can be executed by obtaining the equivalent defect size area 'for the initial size V area of the inclusion by obtaining the value on the "area rea axis" corresponding to the return number and the functional relationship.
- the size of inclusions shows a statistical variation. It is the largest inclusions in the machine component that have a decisive effect on fatigue strength.
- the extreme value statistics already proposed by the present inventor can be used.
- Figure 2 shows the extreme value statistical distribution of the inclusions that became the fatigue fracture starting points.
- Figure 2 plots the data obtained from the fatigue test specimens, with the cumulative frequency on the vertical axis and the size of the inclusions on the horizontal axis. As described above, inclusions behave as if their size grows as the stress repeats due to the presence of hydrogen. Correct according to the expected service life. For this correction, use the relationship diagram in Figure 1.
- the method for designing a long-life fatigue strength of a metal material further includes the step of creating an extreme value statistical distribution of the size of the inclusion that has become a fracture starting point among the inclusions included in the metal material.
- the extreme value statistical distribution is translated in accordance with the relationship of the equivalent defect size V area 'with respect to the initial dimension "area" of the inclusion, and the dimensions of the actual machine component on this translated straight line recursion period corresponding production volume calculated to the use in the calculation of the maximum equivalent defect size area T n the allowable stress corresponding to the maximum of inclusions out of inclusions contained in the actual metallic material used for the mechanical component
- Serial third step of mechanical components design for example, expression of a parameter the maximum equivalent defect size "area '
- the effect of hydrogen trapped in inclusions i.e., defects serving as starting points of fatigue cracks, is considered for metal materials used for mechanical parts to which a considerable number of repeated stresses are applied.
- Figure 1 shows the relationship between the size of inclusions trapped in hydrogen and the number of repetitions of stress up to fracture.
- FIG. 2 is a diagram showing an extreme value statistical distribution of inclusions such as fatigue fracture starting points.
- FIG. 3 is a diagram showing an extreme value statistical distribution of inclusions included in the used material.
- FIG. 4 is a diagram showing the relationship between the growth of ODA and the number of repetitions up to rupture.
- FIG. 5 is a diagram showing a procedure for determining the maximum defect size according to the actual mechanical component dimensions, production volume, and design life.
- FIG. 9 is a diagram showing a procedure for determining a maximum defect size according to a production amount and a design life.
- the functional relationship between the number N f of stress repetitions up to fracture and the dimension of the hydrogen-affected zone around the inclusion — area ' was determined from the results of the fatigue test, and the inclusions corresponding to the expected number of repetitions of stress were determined.
- the equivalent defect size which is the size after the enlargement of, and using this equivalent defect size to calculate long-life fatigue strength such as allowable stress
- the mechanical component is designed to achieve the expected life of the mechanical component. It is possible to design a fracture life in consideration of the expansion of the DA dimension.
- the present invention is useful as a method for designing long-life fatigue strength of a metal material used for a mechanical component that is subjected to a repetitive stress for a long period of time, such as an automobile transmission, a spring, and a vehicle bearing.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Pathology (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
- Heat Treatment Of Articles (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10296558T DE10296558B4 (de) | 2001-03-23 | 2002-03-11 | Langzeitermüdungsfestigkeitsauslegungsverfahren für metallisches Material |
US10/472,383 US6912913B2 (en) | 2001-03-23 | 2002-03-11 | Long life fatigue strength design method for metallic material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001085347A JP4857425B2 (ja) | 2001-03-23 | 2001-03-23 | 金属材料の長寿命疲労強度設計法 |
JP2001-085347 | 2001-03-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002082054A1 true WO2002082054A1 (fr) | 2002-10-17 |
Family
ID=18940869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/002281 WO2002082054A1 (fr) | 2001-03-23 | 2002-03-11 | Procede de conception de materiau metallique presentant une resistance de longue duree a la fatigue |
Country Status (5)
Country | Link |
---|---|
US (1) | US6912913B2 (ja) |
JP (1) | JP4857425B2 (ja) |
CN (1) | CN100491963C (ja) |
DE (1) | DE10296558B4 (ja) |
WO (1) | WO2002082054A1 (ja) |
Cited By (1)
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---|---|---|---|---|
CN115034092A (zh) * | 2022-08-09 | 2022-09-09 | 中国航发北京航空材料研究院 | 含夹杂物的粉末高温合金低周疲劳寿命的预测方法 |
Families Citing this family (24)
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---|---|---|---|---|
FR2904577B1 (fr) * | 2006-08-03 | 2009-06-05 | Snecma Sa | Methode pour evaluer la resistance en fatigue de joints soudes |
US7387031B1 (en) * | 2006-12-22 | 2008-06-17 | Tetra Technologies, Inc. | Method for monitoring corrosion damage to a metal sample |
JP4886623B2 (ja) * | 2007-07-09 | 2012-02-29 | 株式会社東芝 | 破壊評価方法 |
JP5024764B2 (ja) * | 2008-01-22 | 2012-09-12 | 独立行政法人産業技術総合研究所 | 水素ガス中疲労試験方法 |
US7623973B1 (en) * | 2008-05-05 | 2009-11-24 | Gm Global Technology Operations, Inc. | Methods and systems to predict fatigue life in aluminum castings |
US8155940B2 (en) * | 2008-07-30 | 2012-04-10 | GM Global Technology Operations LLC | Methods and systems for predicting very high cycle fatigue properties in metal alloys |
US8515688B2 (en) * | 2009-03-12 | 2013-08-20 | GM Global Technology Operations LLC | Systems and methods to predict fatigue lives of aluminum alloys under multiaxial loading |
JP5345426B2 (ja) * | 2009-03-18 | 2013-11-20 | 日本精工株式会社 | 介在物評価方法 |
JP5267391B2 (ja) * | 2009-09-08 | 2013-08-21 | 株式会社Ihi | 鋳物材の疲労強度評価方法及び装置 |
US8355894B2 (en) * | 2009-12-16 | 2013-01-15 | GM Global Technology Operations LLC | Method for simulating casting defects and microstructures of castings |
JP5718688B2 (ja) * | 2010-03-16 | 2015-05-13 | Ntn株式会社 | 航空機用転がり軸受材料の疲労限面圧の推定方法および推定システム |
US9234826B2 (en) | 2010-03-16 | 2016-01-12 | Ntn Corporation | Assessment of shear fatigue property of rolling contact metal material and estimation of fatigue limit maximum contact pressure using same assessment |
JP5718690B2 (ja) * | 2010-03-16 | 2015-05-13 | Ntn株式会社 | 転がり接触金属材料のせん断疲労特性評価方法および装置 |
US8393226B2 (en) * | 2010-07-29 | 2013-03-12 | Nsk Ltd. | Inclusion rating method |
US8655476B2 (en) * | 2011-03-09 | 2014-02-18 | GM Global Technology Operations LLC | Systems and methods for computationally developing manufacturable and durable cast components |
FR2978546B1 (fr) * | 2011-07-28 | 2013-08-16 | Snecma | Methode et dispositif d'evaluation de la resistance d'un materiau a partir du taux surfacique d'inclusions |
CN102620989B (zh) * | 2012-03-15 | 2013-09-25 | 河海大学 | 环境/应力作用下frp筋耐久性试验装置及试验方法 |
US8707795B2 (en) * | 2012-05-17 | 2014-04-29 | The United States Of America As Represented By The Secretary Of The Navy | Method for measuring fatigue |
CN102967513A (zh) * | 2012-12-19 | 2013-03-13 | 贵州永红航空机械有限责任公司 | 常温下对高温工作机械作随机振动试验的方法 |
CN103543154B (zh) * | 2013-11-04 | 2015-11-11 | 攀钢集团成都钢钒有限公司 | 一种冷拔钢管缺陷形成工序的判定方法 |
CN108535105B (zh) * | 2018-03-22 | 2020-12-15 | 中国科学院金属研究所 | 一种蠕墨铸铁疲劳强度的预测方法 |
CN109255156A (zh) * | 2018-08-13 | 2019-01-22 | 上海理工大学 | 一种结构无限寿命下的轻量化设计方法 |
JP7147645B2 (ja) * | 2019-03-18 | 2022-10-05 | 日本製鉄株式会社 | 結晶粒解析装置、結晶粒解析方法、及びプログラム |
CN113392504B (zh) * | 2021-05-18 | 2024-02-02 | 中国科学院力学研究所 | 一种预测缺陷对高周和超高周疲劳强度影响的方法 |
Citations (1)
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JPH11230961A (ja) * | 1998-02-18 | 1999-08-27 | Nireco Corp | 材料中の最大欠陥又は最大介在物予測方法と装置 |
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US3957450A (en) * | 1973-01-15 | 1976-05-18 | General Electric Company | Article of manufacture with pre-determined fatigue life |
US5419201A (en) * | 1993-02-25 | 1995-05-30 | Li; Yuanfeng | Methods and devices for electrochemically determining metal fatigue status |
US6026691A (en) * | 1995-06-30 | 2000-02-22 | University Of Pennsylvania | Methods and devices for electrochemically determining metal fatigue status |
JP4360509B2 (ja) * | 2000-07-31 | 2009-11-11 | 独立行政法人物質・材料研究機構 | 高強度鋼における高疲労強度の評価法と製造方法 |
US6704664B2 (en) * | 2001-12-18 | 2004-03-09 | Visteon Global Technologies, Inc. | Fatigue sensitivity determination procedure |
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2001
- 2001-03-23 JP JP2001085347A patent/JP4857425B2/ja not_active Expired - Fee Related
-
2002
- 2002-03-11 WO PCT/JP2002/002281 patent/WO2002082054A1/ja active Application Filing
- 2002-03-11 US US10/472,383 patent/US6912913B2/en not_active Expired - Lifetime
- 2002-03-11 DE DE10296558T patent/DE10296558B4/de not_active Expired - Lifetime
- 2002-03-11 CN CNB028072111A patent/CN100491963C/zh not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11230961A (ja) * | 1998-02-18 | 1999-08-27 | Nireco Corp | 材料中の最大欠陥又は最大介在物予測方法と装置 |
Non-Patent Citations (1)
Title |
---|
MURAKAMI YUKITAKA ET AL.: "Kaizaibutsu ni trap sareta suiso ni yoru cho chojumyo hiro hakai no sokushin to tsujo no hiro gendo no shometsu", TETSU TO KO, vol. 86, no. 11, 1 November 2000 (2000-11-01), pages 777 - 783, XP002956322 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115034092A (zh) * | 2022-08-09 | 2022-09-09 | 中国航发北京航空材料研究院 | 含夹杂物的粉末高温合金低周疲劳寿命的预测方法 |
Also Published As
Publication number | Publication date |
---|---|
CN1500207A (zh) | 2004-05-26 |
DE10296558T5 (de) | 2004-04-22 |
JP4857425B2 (ja) | 2012-01-18 |
JP2002286607A (ja) | 2002-10-03 |
CN100491963C (zh) | 2009-05-27 |
US20040112141A1 (en) | 2004-06-17 |
US6912913B2 (en) | 2005-07-05 |
DE10296558B4 (de) | 2013-06-06 |
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