Statistical size effect on multiaxial fatigue strength of notched steel components

Leitner, Martin; Vormwald, Michael; Remes, Heikki

doi:10.1016/j.ijfatigue.2017.08.002

Cited by 42 publications

(16 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Small specimens demonstrate higher fatigue strength compared to standard specimens while real parts exhibit even lower strength than the standard ones. While extended studies have been carried out to compare and evaluate the size effects on fatigue tests [54][55][56][57][58][59][60][61][62][63][64][65][66][67][68], recent studies show the implementation of miniature specimens to be instrumental in characterizing local properties of AM materials [41][42][43].…”

Section: Specimen Design and Preparationmentioning

confidence: 99%

High Cycle Fatigue Performance of LPBF 304L Stainless Steel at Nominal and Optimized Parameters

et al. 2020

View full text Add to dashboard Cite

In additive manufacturing, the variation of the fabrication process parameters influences the mechanical properties of a material such as tensile strength, impact toughness, hardness, fatigue strength, and so forth, but fatigue testing of metals fabricated with all different sets of process parameters is a very expensive and time-consuming process. Therefore, the nominal process parameters by means of minimum energy input were first identified for a dense part and then the optimized process parameters were determined based on the tensile and impact toughness test results obtained for 304L stainless steel deposited in laser powder bed fusion (LPBF) process. Later, the high cycle fatigue performance was investigated for the material built with these two sets of parameters at horizontal, vertical, and inclined orientation. In this paper, displacement controlled fully reversed (R = −1) bending type fatigue tests at different levels of displacement amplitude were performed on Krouse type miniature specimens. The test results were compared and analyzed by applying the control signal monitoring (CSM) method. The analysis shows that specimen built-in horizontal direction for optimized parameters demonstrates the highest fatigue strength while the vertical specimen built with nominal parameters exhibits the lowest strength.

show abstract

Section: Specimen Design and Preparationmentioning

confidence: 99%

High Cycle Fatigue Performance of LPBF 304L Stainless Steel at Nominal and Optimized Parameters

et al. 2020

View full text Add to dashboard Cite

show abstract

“…On the contrary, engineering component in service is doomed to contain more complex three‐dimensional loading characteristics, especially for the component with geometrical discontinuity, such as notch, at which complex stress often exists even in simple uniaxial loading condition. As multiaxial fatigue failures always occur at notches because of the existence of stress concentration, these three‐dimensional loading characteristics should not be overlooked in multiaxial cycle fatigue analysis for meeting practical needs . However, as most multiaxial fatigue tests and fatigue life prediction models were built on thin‐walled tube specimen in early research, there were relatively few multiaxial life prediction models built on notched component alone, although the study is of great practical significance …”

Section: Introductionmentioning

confidence: 99%

“…As multiaxial fatigue failures always occur at notches because of the existence of stress concentration, these three-dimensional loading characteristics should not be overlooked in multiaxial cycle fatigue analysis for meeting practical needs. 17,18 However, as most multiaxial fatigue tests and fatigue life prediction models were built on thin-walled tube specimen in early research, there were relatively few multiaxial life prediction models built on notched component alone, although the study is of great practical significance. [19][20][21] Remarkably, the extra additional cyclic hardening in nonproportional loading condition, caused by the rotation of stress/strain principal axis, can be easily neglected in developing prediction model.…”

Section: Introductionmentioning

confidence: 99%

Prediction of multiaxial fatigue life for complex three‐dimensional stress state considering effect of additional hardening

Xie

Song

Zhao

et al. 2019

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

In engineering practice, it is generally accepted that most of components are subjected to multiaxial stress‐strain state. To analyse this complicated loading state, different types of specimens of 2A12 (2124 in the United States) aluminium alloy were tested under multiaxial loading conditions and a new multiaxial fatigue analysis method for the state of three‐dimensional stress and strain is proposed. Elastic‐plastic finite element method (FEM) and a proposed vector computing method are used to describe the loading state at the critical point of specimen, by which the parameter ΓT is calculated at the new defined subcritical plane to consider the effect of additional cyclic hardening. Meanwhile, the principal equivalent strain is still calculated at the traditional critical plane. The new damage parameter is composed of different process parameters, by which the dynamic path of strain state, including loading environments and material properties, are fully considered in one loading cycle. According to experimental verifications with 2A12 aluminium alloy, the results show that the proposed method shows satisfactory, accurate, and reliable results for multiaxial fatigue life prediction in the state of three‐dimensional stress and strain.

show abstract

“…The round specimen geometry (Figure 1) exhibited a diameter of d = 30 mm and a notch, whose radius was designed to representatively cover the local stress distribution in depth, as for the investigated crankshaft in [16]. Details on the manufacturing of the crankshaft, the extraction of the specimens, the measurements of local properties, as well as fatigue test results for the base material, IH, and IH+StrP condition are provided in [16,22,23]. Machines 2018, 6, x FOR PEER REVIEW 2 of 15Within a previous work [21], the numerical simulation of the IH process and a subsequent application of a local strain-based fatigue approach was demonstrated, whereby the results fit well to the experimental data.…”

mentioning

confidence: 99%

“…The round specimen geometry exhibited a diameter of d = 30 mm and a notch, whose radius was designed to representatively cover the local stress distribution in depth, as for the investigated crankshaft in [16]. Details on the manufacturing of the crankshaft, the extraction of the specimens, the measurements of local properties, as well as fatigue test results for the base material, IH, and IH+StrP condition are provided in [16,22,23].…”

mentioning

confidence: 99%

Numerical Fatigue Analysis of Induction-Hardened and Mechanically Post-Treated Steel Components

2019

Self Cite

View full text Add to dashboard Cite

This paper presents a numerical simulation chain covering induction hardening (IH), superimposed stroke peening (StrP) as mechanical post-treatment, and a final fatigue assessment considering local material properties. Focusing on a notched round specimen as representative for engineering components, firstly, the electro-magnetic-thermal simulation of the inductive heating is performed with the software Comsol®. Secondly, the thermo-metallurgical-mechanical analysis of the hardening process is conducted by means of a user-defined interface, utilizing the software Sysweld®. Thirdly, mechanical post-treatment is numerically simulated by Abaqus®. Finally, a strain-based approach considering the evaluated local material properties is applied, which reveals sound accordance to the fatigue tests results, exhibiting a minor conservative deviation of only up to two per cent, which validates the applicability of the presented numerical fatigue approach.

show abstract

Statistical size effect on multiaxial fatigue strength of notched steel components

Cited by 42 publications

References 50 publications

High Cycle Fatigue Performance of LPBF 304L Stainless Steel at Nominal and Optimized Parameters

High Cycle Fatigue Performance of LPBF 304L Stainless Steel at Nominal and Optimized Parameters

Prediction of multiaxial fatigue life for complex three‐dimensional stress state considering effect of additional hardening

Numerical Fatigue Analysis of Induction-Hardened and Mechanically Post-Treated Steel Components

Contact Info

Product

Resources

About