Small‐sized specimen design with the provision for high‐frequency bending‐fatigue testing

Ghadimi, Hamed; Jirandehi, Arash P.; Nemati, Saber; Guo, Shengmin

doi:10.1111/ffe.13589

Cited by 21 publications

(18 citation statements)

References 49 publications

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“…Then, the surfaces of the specimens were mirror-finished using a vibratory polisher. Before testing, the specimens’ thicknesses were measured at their gauge sections to calculate the induced stresses and verify uniform thickness throughout the samples [ 30 ].…”

Section: Test Specimen Preparationmentioning

confidence: 99%

Effects of Printing Layer Orientation on the High-Frequency Bending-Fatigue Life and Tensile Strength of Additively Manufactured 17-4 PH Stainless Steel

et al. 2023

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In this paper, small blocks of 17-4 PH stainless steel were manufactured via extrusion-based bound powder extrusion (BPE)/atomic diffusion additive manufacturing (ADAM) technology in two different orientations. Ultrasonic bending-fatigue and uniaxial tensile tests were carried out on the test specimens prepared from the AM blocks. Specifically, a recently-introduced small-size specimen design is employed to carry out time-efficient fatigue tests. Based on the results of the testing, the stress–life (S-N) curves were created in the very high-cycle fatigue (VHCF) regime. The effects of the printing orientation on the fatigue life and tensile strength were discussed, supported by fractography taken from the specimens’ fracture surfaces. The findings of the tensile test and the fatigue test revealed that vertically-oriented test specimens had lower ductility and a shorter fatigue life than their horizontally-oriented counterparts. The resulting S-N curves were also compared against existing data in the open literature. It is concluded that the large-sized pores (which originated from the extrusion process) along the track boundaries strongly affect the fatigue life and elongation of the AM parts.

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Section: Test Specimen Preparationmentioning

confidence: 99%

Effects of Printing Layer Orientation on the High-Frequency Bending-Fatigue Life and Tensile Strength of Additively Manufactured 17-4 PH Stainless Steel

et al. 2023

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“…Ultrasonic fatigue tester with the loading frequency of 20 kHz has got a huge success in the researches of VHCF tests with the axial‐loading 4 and fully reversed bending loading 5 . It becomes a most popular approach of VHCF testing, and numerous S‐N data in the VHCF regime have been conveniently obtained due to its high efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Ultrasonic fatigue tester with the loading frequency of 20 kHz has got a huge success in the researches of VHCF tests with the axial-loading 4 and fully reversed bending loading. 5 It becomes a most popular approach of VHCF testing, and numerous S-N data in the VHCF regime have been conveniently obtained due to its high efficiency. Moreover, the relevant VHCF failure mechanisms of titanium alloys 6,7 and other alloys 8,9 have been revealed, which substantially promotes the applications and development of materials in the long fatigue lifetime.…”

Section: Introductionmentioning

confidence: 99%

Fatigue behaviors of a titanium alloy in the VHCF regime based on a vibration‐based bending fatigue test

Chen

Gao

et al. 2022

Fatigue Fract Eng Mat Struct

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A vibration-based bending fatigue test based on electrodynamic shaker is conducted in order to study the high cycle and very high cycle fatigue (VHCF) behaviors of a titanium alloy TC17 with a sort of novel specimens. After obtaining a full S-N curve covering the lifetime up to 10 9 cycles, several fatigue crack initiation and failure process modes are revealed based on the observation of the fracture surfaces. Especially, the statistical distribution characteristics of the fatigue lifetime and some relevant factors are discussed. The results indicate that the obtained S-N curve does not exhibit a plateau region in the VHCF regime. And the present crack initiation mechanism involves the facets formed by the primary α-phase cleavage and the development of microcracks.Moreover, the scatter of the fatigue lifetime can be obviously influenced by the resonance frequency range of the specimens.

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“…The miniature tensile bar has dimensions shown in Figure 3, following American Society for Testing and Materials standards (Hung et al , 2020; Kolhatkar et al , 2019). An Instron machine was used to measure the tensile specimens with a clip-on extensometer at the crosshead speed of 0.015 1/min (strain rate per minute) (Jirandehi and Khonsari, 2021; Ghadimi et al , 2021). The YS, UTS and ductility were measured from eight LFP-fabricated tensile specimens in the laser scan direction, and the mean values and standard deviations (STDs) were reported.…”

Section: Process Overview Constructed System and Experimental Measure...mentioning

confidence: 99%

Development and experimental study of an automated laser-foil-printing additive manufacturing system

Hung

Turk

Sehhat

et al. 2022

RPJ

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Purpose This paper aims to present the development and experimental study of a fully automated system using a novel laser additive manufacturing technology called laser foil printing (LFP), to fabricate metal parts layer by layer. The mechanical properties of parts fabricated with this novel system are compared with those of comparable methodologies to emphasize the suitability of this process. Design/methodology/approach Test specimens and parts with different geometries were fabricated from 304L stainless steel foil using an automated LFP system. The dimensions of the fabricated parts were measured, and the mechanical properties of the test specimens were characterized in terms of mechanical strength and elongation. Findings The properties of parts fabricated with the automated LFP system were compared with those of parts fabricated with the powder bed fusion additive manufacturing methods. The mechanical strength is higher than those of parts fabricated by the laser powder bed fusion and directed energy deposition technologies. Originality/value To the best knowledge of authors, this is the first time a fully automated LFP system has been developed and the properties of its fabricated parts were compared with other additive manufacturing methods for evaluation.

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Small‐sized specimen design with the provision for high‐frequency bending‐fatigue testing

Cited by 21 publications

References 49 publications

Effects of Printing Layer Orientation on the High-Frequency Bending-Fatigue Life and Tensile Strength of Additively Manufactured 17-4 PH Stainless Steel

Effects of Printing Layer Orientation on the High-Frequency Bending-Fatigue Life and Tensile Strength of Additively Manufactured 17-4 PH Stainless Steel

Fatigue behaviors of a titanium alloy in the VHCF regime based on a vibration‐based bending fatigue test

Development and experimental study of an automated laser-foil-printing additive manufacturing system

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