True stress–strain curve acquisition for irradiated stainless steel including the range exceeding necking strain

Kamaya, Masayuki; Kitsunai, Yuji; Koshiishi, Masato

doi:10.1016/j.jnucmat.2015.05.027

Cited by 31 publications

(14 citation statements)

References 31 publications

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“…Another type of approach is the inverse FEA method, which iteratively adjusts the true stress–strain curve in the FEA simulation to match the experimental measured quantities such as virtual work, 20 load force, 21,22 or axial stress. 23 The advantage of the inverse FEA method is that the description of the true stress–strain curve could be the piece-wise linear function instead of the predefined model. However, the limitation is that the iterative process is laborious and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Determination of constitutive relation from miniature tensile test with digital image correlation

Zhang

Karnati

Pan

et al. 2020

The Journal of Strain Analysis for Engineering Design

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The determination of constitutive relation from the miniature tensile test is of high interest in multiple areas. Here, a convenient experimental method is proposed to determine the true stress–strain curve from the miniature tensile test. The instantaneous cross-sectional area is estimated by only one camera in aid of digital image correlation technique. This method was applied on commercial pure titanium and aluminum 6061 alloys, and the results indicate that the extracted true stress–strain curves are not scale-dependent. The derived mechanical properties from miniature specimens match well with the results of standard specimens. The correctness of the true stress–strain curve was evaluated by the finite element analysis method. The results suggest that the derived true stress–strain curve is capable to represent the constitutive behavior of the tested materials.

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Section: Introductionmentioning

confidence: 99%

Determination of constitutive relation from miniature tensile test with digital image correlation

Zhang

Karnati

Pan

et al. 2020

The Journal of Strain Analysis for Engineering Design

View full text Add to dashboard Cite

show abstract

“…Calculating

σ_{s}^{m a x}

and

P_{c}^{m i n}

, and based on the response surface method, the relationship of

σ_{s}^{m a x}

and

P_{c}^{m i n}

changing against

Δ d

can be obtained. According to the relationship, a better mode exists with a higher degree of response surface to display the relationship between

σ_{s}^{m a x}

P_{c}^{m i n}

and

Δ d

[24,25,26]. …”

Section: Methods For Reliability Analysismentioning

confidence: 99%

Time-Variant Reliability Analysis for Rubber O-Ring Seal Considering Both Material Degradation and Random Load

et al. 2017

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Due to the increase in working hours, the reliability of rubber O-ring seals used in hydraulic systems of transfer machines will change. While traditional methods can only analyze one of the material properties or seal properties, the failure of the O-ring is caused by these two factors together. In this paper, two factors are mainly analyzed: the degradation of material properties and load randomization by processing technology. Firstly, the two factors are defined in terms of material failure and seal failure, before the experimental methods of rubber materials are studied. Following this, the time-variant material properties through experiments and load distribution by monitoring the processing can be obtained. Thirdly, compressive stress and contact stress have been calculated, which was combined with the reliability model to acquire the time-variant reliability for the O-ring. Finally, the life prediction and effect of oil pressure were discussed, then compared with the actual situation. The results show a lifetime of 12 months for the O-ring calculated in this paper, and compared with the replacement records from the maintenance workshop, the result is credible.

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“…This correction factor was first proposed by Bridgman 41 famously known as “Bridgman correction factor.” There have been many efforts to obtain such correction factors or the equivalent stresses after the initiation of diffuse necking in several other ways. 15,30,31,33,43,47 A basic Bridgman correction factor as provided in refs. 32,40,42 is expressed as 32,41…”

Section: Procedures For Estimating the Materials Parametersmentioning

confidence: 99%

“…Very recently, deformation behavior post-necking have been studied with greater interest. 15,30–36 Prediction of true stress-true strain curve beyond uniform deformation (after the onset of necking) is useful for studying large plastic deformation phenomena occurring during metal forming, crash, fatigue, and fracture. 35–37…”

Section: Introductionmentioning

confidence: 99%

A full-range stress-strain model for metallic materials depicting non-linear strain-hardening behavior

Swain¹,

Selvan²,

Thomas³

et al. 2020

The Journal of Strain Analysis for Engineering Design

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Ramberg-Osgood (R-O) type stress-strain models are commonly employed during elasto-plastic analysis of metals. Recently, 2-stage and 3-stage R-O variant models have been proposed to replicate stress-strain behavior under large plastic deformation. The complexity of these models increases with the addition of each stage. Moreover, these models have considered deformation till necking only. In this paper, a simplistic multi-stage constitutive model is proposed to capture the strain-hardening non-linearity shown by metals including its post necking behavior. The constitutive parameters of the proposed stress-strain model can be determined using only elastic modulus and yield strength. 3-D digital image correlation was used as an experimental tool for measuring full-field strains on the specimens, which were subsequently utilized to obtain the material parameters. Our constitutive model is demonstrated with an aerospace-grade stainless steel AISI 321 wherein deformation response averaged over the gauge length (GL) and at a local necking zone are compared. The resulting averaged and local material parameters obtained from the proposed model provide interesting insights into the pre and post necking deformation behavior. Our constitutive model would be useful for characterizing highly ductile metals which may or may not depict non-linear strain hardening behavior including their post necking deformations.

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True stress–strain curve acquisition for irradiated stainless steel including the range exceeding necking strain

Cited by 31 publications

References 31 publications

Determination of constitutive relation from miniature tensile test with digital image correlation

Determination of constitutive relation from miniature tensile test with digital image correlation

Time-Variant Reliability Analysis for Rubber O-Ring Seal Considering Both Material Degradation and Random Load

A full-range stress-strain model for metallic materials depicting non-linear strain-hardening behavior

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