Development of miniature cruciform specimen and testing machine for multiaxial creep investigation

Hiyoshi, Noritake; Itoh, Takamoto; Sakane, Masao; Tsurui, Takafumi; Tsurui, Masaaki; Hisaka, Chiaki

doi:10.1016/j.tafmec.2020.102582

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…For example, the method of pulling in the biaxial direction (especially the structure of the gripping part) was analyzed using the finite element method, and it was found that the load acting on the specimen increases linearly with the thickness of the point (figure 34). Similarly, the applicability of a similar type of cruciform specimen [18] to the creep test was evaluated and the validity of the specimen was confirmed through stress analysis using model calculations (figure 35). We have also succeeded in measuring creep strain using a non-contact digital image analysis method.…”

Section: Multi-axial Loading Issuementioning

confidence: 99%

The status of the Japanese material properties handbook and the challenge to facilitate structural design criteria for DEMO in-vessel components

et al. 2021

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This paper summarizes the current status of the material properties handbook for a structural design using Japanese reduced-activation ferritic/martensitic steel F82H. Specifically, the key structural parameters, e.g. time-independent/dependent design stresses and fatigue design curves, were determined by following the French structural design code RCC-MRx. Moreover, under the Japan–U.S. collaboration, tensile data were newly added to the benchmark heavy irradiation data up to 80 dpa, as critical input information in the intermediate check and review in Japan. Furthermore, the status of structural material data and the near-term and long-term issues were clarified by the evaluation using the attribute guides. In parallel, the structural design approaches, which were newly introduced and extended to cope with the structural design issues under the complex environmental conditions peculiar to the DEMO reactor, were noted with the initial R&D results. Of the many design issues, the multi-axial loading conditions due to the complexity of the DEMO reactor as well as the coolant compatibility and the irradiation effect are mentioned. For example, in the paper, multi-axial fatigue–creep testing and evaluation using the modified universal slope method and brittle/ductile fracture testing and evaluation using the local approach are explained toward DEMO.

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Section: Multi-axial Loading Issuementioning

confidence: 99%

The status of the Japanese material properties handbook and the challenge to facilitate structural design criteria for DEMO in-vessel components

et al. 2021

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“…A qualified cruciform specimen requires that the stress distribution is uniform and its failure occurs in the center area of the specimen under cyclic loading. [16][17][18][19][20] The cruciform specimens have been widely used on metal materials to study their multiaxial fatigue behaviors and fatigue failure mechanism. [21][22][23][24][25][26][27][28] Currently, there has been a growing focus on the multiaxial fatigue behaviors and fatigue damage accumulation of polymers and composites due to their increasing application in some important industrial fields.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the design and preparation of a qualified cruciform specimen is paramount for analyzing the multiaxial mechanical behavior of the adhesive. A qualified cruciform specimen requires that the stress distribution is uniform and its failure occurs in the center area of the specimen under cyclic loading 16–20 …”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on mechanical behavior of silane‐modified polyurethane sealant under biaxial cyclic loading

Zhang,

Zhang

2024

Fatigue Fract Eng Mat Struct

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The biaxial tension–tension cyclic loading experiments were conducted on the cruciform specimens prepared using a silane‐modified polyurethane sealant to investigate their mechanical behavior. The finite element method was employed to validate the mechanical behavior of cruciform specimens under the biaxial cyclic loading conditions. It is shown that the highest stress concentration is in the central region of the cruciform specimens, indicating that the shape design of the specimen is suitable for the biaxial tension–tension cyclic tests. Additionally, the effects of loading path, mean stress, and stress amplitude on ratcheting strain and dissipated energy were analyzed through the experimental data. The experimental results demonstrated that the loading path had an influence on the mechanical behavior of the cruciform specimen. The additional ratcheting strain caused by the non‐proportional loading path was found to be loading path dependent of the adhesive. Moreover, the mean stress and stress amplitude greatly affected the strain response curves of the specimen under biaxial cyclic loading. The ratcheting strain and dissipated energy increased with increasing mean stress and stress amplitude; nevertheless, stress amplitude had more influence on the mechanical behavior than the mean stress.

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“…However, the confidence of these results compared to standard sample sizes is of great importance. Miniature specimens, or creep specimens with non-standard geometry, have been used for some time to investigate steel's creep behavior in power plant construction, e.g., [13][14][15][16][17][18]. Pipelines and connectors are components subjected to creep stresses, which cannot be investigated reproducibly with the geometry of standard creep specimens.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Specimen Size and Test Procedure on the Creep Behavior of ME21 Magnesium Alloy

Camin

Gille

2021

Crystals

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Lightweight constructions and materials offer the opportunity to reduce CO2 emissions in the transport sector. As components in vehicles are often exposed to higher temperatures above 40% of the melting temperature, there is a risk of creep. The creep behavior usually is investigated based on standard procedures. However, lightweight constructions frequently have dimensions not adequately represented by standardized specimen geometries. Therefore, comparative creep experiments on non-standardized miniature and standardized specimens are performed. Due to a modified test procedure specified by a miniature creep device, only the very first primary creep stage shows a minor influence, but subsequently, no effect on the creep process is detected. The creep behavior of hot extruded and heat treated ME21 magnesium alloy is investigated. It is observed that the creep parameters determined by the miniature and standard creep tests are different. As the deviations are systematic, qualitatively, evidence of the creep behavior is achieved. The creep parameters obtained, and particularly the creep strain and the strain rate, show a higher creep resistance of the miniature specimen. An initial higher number of twinned grains and possible multiaxiality in the gauge volume of the miniature specimen can be responsible.

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Development of miniature cruciform specimen and testing machine for multiaxial creep investigation

Cited by 11 publications

References 24 publications

The status of the Japanese material properties handbook and the challenge to facilitate structural design criteria for DEMO in-vessel components

The status of the Japanese material properties handbook and the challenge to facilitate structural design criteria for DEMO in-vessel components

Experimental investigation on mechanical behavior of silane‐modified polyurethane sealant under biaxial cyclic loading

The Effect of Specimen Size and Test Procedure on the Creep Behavior of ME21 Magnesium Alloy

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