A new model for characterizing primary creep damage

Brust, F. W.; Leis, Brian N.

doi:10.1007/bf00040855

Cited by 13 publications

(3 citation statements)

References 37 publications

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“…In cold metal forming processes, multiplication of dislocations is the dominant deformation mechanism and no grain boundary sliding takes place (Li et al, 1994;Brust and Leis, 1992). This causes voids to be nucleated around second phases (Zheng et al, 1996), normally within grains, as shown in Figures 1(e), 2(c) and (d).…”

Section: Damage Due To Ductile Void Growthmentioning

confidence: 98%

A Review on Damage Mechanisms, Models and Calibration Methods under Various Deformation Conditions

Lin

Liu

Dean

2005

International Journal of Damage Mechanics

143

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The development of microdamage under the deformation conditions of high temperature creep, cold metal forming, superplastic forming, and hot metal forming has been reviewed and discussed, and typical constitutive equations developed to model the individual damage mechanisms are summarized. Based on the microstructural analysis of the key damage features for metallic materials under a wide range of deformation conditions, a set of schematic diagrams is designed to illustrate the major types of damage mechanisms. This helps researchers and engineers to understand the major cause of failure of materials under different deformation conditions and to select simple and appropriate mechanism-based damage equations to predict the damage evolution. Further discussions are carried out on the dominant damage mechanisms in hot metal forming conditions and it is concluded that the dominant damage mechanism can be 'grain boundary (creeptype) damage' or 'plasticity-induced (ductile) damage' depending on the material microstructure and deformation rate. In the case of grain boundary damage in hot forming, the shape of microdefects is different from those in high temperature creep and superplastic forming although all of those result in intergranular failure of materials. Furthermore, damage calibration techniques for different conditions of plastic deformation are summarized and discussed.KEY WORDS: damage mechanisms, damage calibrations, creep and viscoplasticity, cold and hot metal forming.

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Section: Damage Due To Ductile Void Growthmentioning

confidence: 98%

A Review on Damage Mechanisms, Models and Calibration Methods under Various Deformation Conditions

Lin

Liu

Dean

2005

International Journal of Damage Mechanics

143

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“…Another aspect of the sustained-load effect is that there can be some primary creep crack growth that can reduce the failure stress or strain capacity. Primary creep crack growth can occur at any temperature if the stresses are close to the failure stress (that is, stress-induced primary creep [112,113]). The effect of hold-time on hydrostatic testing has been a concern for decades for axial flaws in pipelines.…”

Section: Effects Of Loading Ratesmentioning

confidence: 99%

Advanced Integration in Multi-Scale Mechanics and Welding Process Simulation in Weld Integrity Assessment

Wilkowski¹,

W²,

Babu³

2008

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“…Although creep behavior at ambient temperature is in the form of primary creep [7,8] and the creep strain is limited [9], the room-temperature creep will affect material mechanics performance [5,6,[10][11][12]. Moreover, the creep significance will be more obvious if the stress is higher, and primary creep will occur at the stress concentration area near a crack tip [13], which will threaten the safety of structure with crack. Meanwhile, the high stress level will appear due to stress concentration in practical engineering, such as the discontinuous part of structure.…”

Section: Introductionmentioning

confidence: 97%