Effect of specimen size on the flow stress of rod specimens of polycrystalline CuAl alloy

Miyazaki, S.; Fujita, Hiroshi; Hiraoka, Haruo

doi:10.1016/0036-9748(79)90067-x

Cited by 54 publications

(20 citation statements)

References 2 publications

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“…be found in Miyazaki et al (1978Miyazaki et al ( , 1979, Kals (1998), Kals and Eckstein (2000), Nakamachi et al (2000), Janssen et al (submitted for publication). In the present paper, particular attention is focused on the interpretation of the results found in Janssen et al…”

Section: Grain Size Effects Experimental Analysismentioning

confidence: 92%

“…If the number of grains gets small, clear microstructural effects will contribute and all of these effects cannot be separated trivially in the experimental results. Only few papers seem to deal with this microstructural contribution, and mostly in a different context (Miyazaki et al, 1978(Miyazaki et al, , 1979Kals and Eckstein, 2000;Nakamachi et al, 2000;Raulea et al, 2001;Klein et al, 2001;Hansen, 2005). The present paper concentrates on this important aspect, since it will be shown that depending on the specimen size and the underlying microstructural geometry, weakening effects may occur jointly with strengthening effects.…”

Section: Introductionmentioning

confidence: 94%

See 1 more Smart Citation

Size effects in miniaturized polycrystalline FCC samples: Strengthening versus weakening

Geers

Brekelmans

Janssen

2006

International Journal of Solids and Structures

107

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This paper focuses on a computational-experimental analysis of sample geometry dominated and grain dominated size effects in miniaturized polycrystalline FCC components, where the grain size, orientation and grain boundaries play an important role. Experimental and numerical findings elucidate the joint contribution of first-order and second-order size effects for this type of components. The intrinsic competition between the weakening and strengthening contributions resulting from these effects is commented and further analysed. It is shown that a second-order crystal plasticity model is needed to account for the simultaneous contributions of both size effects.

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Section: Grain Size Effects Experimental Analysismentioning

confidence: 92%

Section: Introductionmentioning

confidence: 94%

Size effects in miniaturized polycrystalline FCC samples: Strengthening versus weakening

Geers

Brekelmans

Janssen

2006

International Journal of Solids and Structures

107

View full text Add to dashboard Cite

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“…For the newly proposed criterion of equation ( As was already mentioned by Armstrong (1961), Miyazaki et al (1979), Yuan et al (1994 and Geiger et al (1996), so-called size effects occur along with the miniaturisation of forming processes, where materials can no longer be assumed to behave as an isotropic continuum. This is, because separate grains have strong anisotropic behaviour due to their orientation.…”

Section: Discussionmentioning

confidence: 99%

Prediction of Ductile Fracture in Metal Blanking

Goijaerts

Govaert

Baaijens

1999

Journal of Manufacturing Science and Engineering

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This study is focused on the description of ductile fracture initiation, which is needed to predict product shapes in the blanking process. Two approaches are elaborated using a local ductile fracture model. According to literature, characterization of such a model should take place under loading conditions, comparable to the application. Therefore, the first approach incorporates the characterization of a ductile fracture model in a blanking experiment. The second approach is more favorable for industry. In this approach a tensile test is used to characterize the fracture model, instead of a complex and elaborate blanking experiment. Finite element simulations and blanking experiments are performed for five different clearances to validate both approaches. In conclusion it can be stated that for the investigated material, the first approach gives very good results within the experimental error. The second approach, the more favorable one for industry, yields results within 6 percent of the experiments over a wide, industrial range of clearances, when a newly proposed criterion is used. [S1087-1357(00)02202-4]

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“…A summary of different types of size effects and their corresponding characteristic parameters is presented in Table 1.1, where d is material grain size, t 0 the specimen thickness, D 0 the specimen diameter, and D c the die cavity. The "specimen size effect" (t 0 or D 0 ) on the material flow curve as a measure of material response was observed in various tensile test conditions for a variety of materials such as CuAl alloy [35], CuNi18Zn20, CuZn15 [36], CuZn36 [37], and aluminum [38,39]. While the grain size shows a strong effect on the material response at all length scales (i.e., from macro-to micro-scale), it is not until the N value is around 10-15 that the "specimen size effect" starts to influence the material response [31,38,40].…”

Section: Size Effects In Micro-forming Processesmentioning

confidence: 99%