Evaluation of Plastic Deformation Limit by Circumferentially Notched Tension Test

Enami, Keitaro; Nagai, Kotobu

doi:10.2355/tetsutohagane1955.91.2_285

Cited by 15 publications

(8 citation statements)

References 9 publications

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“…Some data refer to experimental results from a previous study, 17,18) and the specimen ufg-FC is the ultrafine-grained ferrite-cementite steel with an average ferrite grain size of 1.5 µm. 8) By using these materials, static tensile tests and stepwise tensile tests in order to obtain · and ¾ until just before fracture were conducted.…”

Section: Methodsmentioning

confidence: 99%

“…8) By using these materials, static tensile tests and stepwise tensile tests in order to obtain · and ¾ until just before fracture were conducted. 17) Round tensile test specimens with a gage length of 40 mm and gage diameter of 8 mm were prepared from the materials. Static tensile tests were performed with an initial strain rate of 5 © 10 ¹4 s ¹1 (the constant crosshead speed of 0.02 mm/s) at 296 K by using a gear-driven type Instron machine.…”

Section: Methodsmentioning

confidence: 99%

“…In the stepwise tensile test, the load (P), radius of the neck section (a), and the radius of curvature of the neck profile (R) were measured during the temporary stops of the tensile test. 12,17) In the measurements of R, the contour of the necked region was approximated by the arc of a circle.…”

Section: Methodsmentioning

confidence: 99%

“…As a result, · and the necking ratio change were evaluated as a function of ¾ (up to a value of approximately 1.0). The value of · usually continues increasing during tensile deformation, 1,2) but Enami et al 17,18) reported that the estimated · decreased just before fracture. In this study, the point just before fracture, in which · starts decreasing, is called the plastic deformation limit and is considered as the initiation point for fracture.…”

Section: Introductionmentioning

confidence: 99%

“…12,13) The ·¾ relationship up to the plastic deformation limit can be estimated by combining the stepwise tensile test and the Bridgman equation. 17,18) Materials, such as steels, are deformed until large true strains of more than 1.0 occur in plastic working processes, 10,20) and the deformation behavior at high strains is also of great importance for bulk nanostructured metals because of severe plastic deformation procedures. 21,22) However, there is little data for the ·¾ relationship up until fracture in various materials.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Estimations of the True Stress and True Strain until Just before Fracture by the Stepwise Tensile Test and Bridgman Equation for Various Metals and Alloys

Tsuchida

Inoue

Enami³

2012

Mater. Trans.

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True stress (·)true strain (¾) relationships until just before fracture, i.e., the plastic deformation limit, were estimated by the stepwise tensile test and the Bridgman equation for various metals and alloys with different crystal structures. The estimated ·¾ relationships were different from the nominal stressstrain curves including the conventional tensile properties. In the relationships between the true stress (· pdl ) and true strain (¾ pdl ) at the plastic deformation limit, SUS304 and SUS329J4L indicated a better · pdl ¾ pdl balance. On the other hand, SUS329J4L, tempered martensite, and an ultrafine-grained steel showed superior results in the yield strength¾ pdl balance. The estimated ·¾ relationship for the ultrafine-grained steel suggests that grain refinement strengthening can improve · and ¾ up until the plastic deformation limit. The value of ¾ pdl became larger with increasing the reduction in area and a decrease in the fracture stress. The products of · pdl and ¾ pdl became larger with increasing work-hardening rate at the plastic deformation limit.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Estimations of the True Stress and True Strain until Just before Fracture by the Stepwise Tensile Test and Bridgman Equation for Various Metals and Alloys

Tsuchida

Inoue

Enami³

2012

Mater. Trans.

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Experimental evaluation of the local failure criterion and its implementation in a damage mechanics model

Nakamura¹,

Arai²,

Kikuchi³

2021

International Journal of Pressure Vessels and Piping

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Consideration of a Stress-Based Criterion for Local Failure and Its Implementation in a Damage Mechanics Model

Nakamura¹

2019

Journal of Pressure Vessel Technology

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Analyses of the notched tension tests of carbon steel show that ductile failure is initiated when the sum of flow stress and mean stress reaches the limit for the material, regardless of stress triaxiality. Therefore, this explicit critical stress condition could be a candidate criterion for local failure. An equation expressing the relation between stress triaxiality and critical strain was derived from the critical stress condition, and it was found that the critical strain diagram obtained by the equation nearly overlapped with that obtained by the conventional empirical equation. This suggests that the critical stress condition can be approximately determined if the critical strain diagram was obtained for a particular steel. The critical stress condition was consistent with the classical void nucleation theory, and the theory was incorporated into the void nucleation term of stress control in the Gurson–Tvergaard (GT) model—a well-known damage mechanics model for ductile failure. Since only the strain-controlled term is used in the recent GT model, herein, a finite element method (FEM) code was newly developed to implement the GT model with the stress-controlled term. Notched tension tests were analyzed with the critical stress condition using the developed code, and the analyses reproduced the failure behaviors and critical strains of the tests considerably well. These results strongly support the practicality of the stress-based criterion and demonstrate that ductile failure could be appropriately predicted by combining the GT model using the void nucleation term of stress control with the critical stress condition.

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Evaluation of Plastic Deformation Limit by Circumferentially Notched Tension Test

Cited by 15 publications

References 9 publications

Estimations of the True Stress and True Strain until Just before Fracture by the Stepwise Tensile Test and Bridgman Equation for Various Metals and Alloys

Estimations of the True Stress and True Strain until Just before Fracture by the Stepwise Tensile Test and Bridgman Equation for Various Metals and Alloys

Experimental evaluation of the local failure criterion and its implementation in a damage mechanics model

Consideration of a Stress-Based Criterion for Local Failure and Its Implementation in a Damage Mechanics Model

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