Fatigue of metals – What the designer needs?

Weiß, Martin; Lavi, Erel

doi:10.1016/j.ijfatigue.2015.11.013

Cited by 6 publications

(9 citation statements)

References 6 publications

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“…In fact, referring to Figure at loading level in the plastic regime (145 MPa) near the failure, the maximum temperature variation of duplex steel is approximately of 1°C, while 3.5°C at 115 MPa and 2°C at 220 MPa were obtained for AISI 316 and 17‐4 PH, respectively. It is worth noting that the temperature variations of austenitic and martensitic stainless steels are in agreement with the temperature changes reported in literature …”

Section: Discussion Of the Correlation Between Temperature Variationssupporting

confidence: 91%

“…It is worth noting that the temperature variations of austenitic and martensitic stainless steels are in agreement with the temperature changes reported in literature. [4][5][6]23,32 The temperature variation of duplex is lower than in austenitic and martensitic material, even if the material experiences large deformations, as represented by Figure 13. In this figure, in effect, the ductile behaviour of duplex is confirmed: the deformation (170 mm) is nearly equivalent to that of AISI 316 which is 200 mm.…”

Section: Resultsmentioning

confidence: 99%

“…The fatigue characterization of steels is generally carried out by performing conventional test methods (i.e., Wohler curve and Staircase) based on statistic assessment of the fatigue limit. However, these methods provide an estimation of the fatigue limit disregarding any microstructural information and involve time‐consuming experimental campaigns.…”

Section: Introductionmentioning

confidence: 99%

“…To verify the proposed approach, 3 stainless steels were investigated by performing fatigue tests at R = 0.5 with a stepwise loading procedure, the AISI 316, 17‐4 PH and ASTM A 890 grade 4a steels, respectively, fully austenitic, fully martensitic, and biphasic austeno‐ferritic steels used in the gas and oil industrial field. All the aspects concerning the mechanical characterization of austenitic AISI 316 and martensitic 17‐4 PH are extensively described in other works . ASTM A 890 grade 4a consists of austenitic clusters of grain embedded into a ferritic lattice: the presence of both austenite and ferrite promotes a global heterogeneity.…”

Section: Introductionmentioning

confidence: 99%

“…All the aspects concerning the mechanical characterization of austenitic AISI 316 and martensitic 17-4 PH are extensively described in other works. [4][5][6]23,32 ASTM A 890 grade 4a consists of austenitic clusters of grain embedded into a ferritic lattice: the presence of both austenite and ferrite promotes a global heterogeneity. The texture of the material is composed by lattice mismatch, 24 lattice discontinuities (grain interfaces, distribution of grain orientation, and interstitial/ substitutional atoms in the matrix 25 ), and different grain shapes ("equiassic" or "columnar/elongated").…”

Section: Introductionmentioning

confidence: 99%

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Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

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et al. 2017

Fatigue Fract Eng Mat Struct

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A critical aspect of standard test methods for fatigue characterization is that they do not provide any information on heat dissipation in the material and involve very expensive experimental campaigns in time and costs. In recent years, thermographic methods capable of reducing testing time have been developed, also providing more information on damage occurring in the material. A commonly used approach is based on the assessment of the temperature plateau during a stepwise loading procedure. At times, however, this approach can fail if temperature stabilization is not achieved. In this regard, in this paper, a new approach based on the assessment of 3 different thermal indexes was proposed to estimate the fatigue limit of 3 stainless steels: AISI 316, 17‐4PH, and ASTMA890 grade 4a, respectively, exhibiting fully austenitic, fully martensitic, and duplex biphasic microstructure. The fatigue tests were carried out by using a stepwise loading procedure, under loading ratio of 0.5. The analysis demonstrated the possibility to further reduce testing time and, consequently, the fatigue experimental campaign. Moreover, some ideas are discussed about how to justify the different thermal behaviour of a biphasic stainless steel, in total temperature variation. Moreover, a discussion of results regarding the various thermal behaviours of the investigated steels and a possible correlation with the microstructure has been proposed.

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Section: Discussion Of the Correlation Between Temperature Variationssupporting

confidence: 91%