The effects of triaxial stress on void growth and yield equations of power‐hardening porous materials

Kong, Xiangwei; Zhao, H.; Holland, D.; Dahl, Winfried

doi:10.1002/srin.199200481

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…However, a modification following a recommendation by T.-J. Wang [39] and the implementation of a limit value go, substituting (6) by (9a) led to better agreement with the experiments, see especially the extensive experimental program by Dahl and cooperators [9,10] and the corresponding comments in the next chapter. Of course for k = 3 and go = 0, (9a) becomes (6).…”

Section: (8)mentioning

confidence: 99%

“…la, b, c, d for different parameters k, a. and computational test program by Dahl and cooperators, see [9,10]. They investigated the triaxiality factor crm/Creq for both smooth and notched specimens by a finite element study and performed a series of tension tests for German steels Fe33 and Fe510.…”

Section: [( ]mentioning

confidence: 99%

“…Eftis and Nemes [8] analyzed a spherical void in a strain hardening and strain rate dependent material and implemented this micromechanical model into Perzyna's elasto-viscoplastic model. Dahl and cooperators [9,10] implemented several material-specific values into the Gurson model which can be determined by density measurements at different volume fractions. Dawson and Lee [11][12][13] investigated the growth of a central spherical void in a viscoplastic larger sphere or cylinder and found a specific evolution law for the porosity.…”

Section: Introductionmentioning

confidence: 99%

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A note on calibration of ductile failure damage indicators

et al. 1995

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After a review of the literature on the prognosis of ductile fracture, a damage indicator is developed which is based on micromechanical results and adapted to experiments. A calibration of this damage indicator is possible by inspecting in detail a load displacement curve for a long and smooth specimen. Relation to currently published damage indicators is discussed. The damage indicators can be used to indicate the onset of a local crack in a ductile structure.

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Section: (8)mentioning

confidence: 99%

Section: [( ]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A note on calibration of ductile failure damage indicators

et al. 1995

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Investigations concerning quantitative determination of local damage in ductile materials

et al. 1992

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Ductile fracture of metallic materials can be described by void nucleation, growth and coalescence. The first coalescence of voids defines crack initiation. A quantitative description of material damage by the means of continuum‐mechanics is a very current theme. Using Gurson's model and the yield equation modified by Needleman and Tvergaard a quantitative description of damage condition is possible by connecting stress triaxiality and void volume fraction. In this paper failure curves, in which the effective plastic strain is plotted as a function of stress triaxiality, will be generated by a new yield equation, which is a further development of the Gurson model. The failure curves will be shown for crack initiation and other damage situations. An advantage of the further developed yield equation, compared with the conventional one, can be seen in the fact that not one constant, which is independent of the material, but several material specific values are used. These values can be determined by density measurements at different void volume fractions. The procedure for determination of failure curves will be shown and subsequently test results will be discussed.

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Effects of the constraint parameter triaxial stress on the failure behaviour of steels

1993

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The constraint parameter triaxial stress which results from loading types and component geometries plays an important role in the failure behaviour of materials. Especially the local failure initiation of materials depends very strongly on triaxial stress. The failure behaviour of a material under different stress states (i.e. different constraint) differs. In this paper effects of triaxial stress on the failure behaviour of steels are presented by means of theoretical analysis, experiments and finite‐element‐calculations. A theoretical model describing the effects of triaxial stress on failure initiation of materials has been developed based on theoretical analysis. Corresponding experiments were conducted to determine the material constants in the failure model of materials. In order to obtain local damage parameters finite‐element calculations have been conducted. According to the results from theoretical analysis, experiments and finite‐element calculations the damage curves of materials, in which the critical equivalent plastic strain is plotted as a function of triaxial stress, have been obtained. Furthermore, the failure behaviour of materials under different triaxial stresses has been discussed.

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The effects of triaxial stress on void growth and yield equations of power‐hardening porous materials

Cited by 4 publications

References 7 publications

A note on calibration of ductile failure damage indicators

A note on calibration of ductile failure damage indicators

Investigations concerning quantitative determination of local damage in ductile materials

Effects of the constraint parameter triaxial stress on the failure behaviour of steels

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