The description of cyclic plasticity and viscoplasticity of waspaloy using unified constitutive equations

Tong, Jie; Vermeulen, B.

doi:10.1016/s0142-1123(02)00162-7

Cited by 41 publications

(32 citation statements)

References 9 publications

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“…As the temperature increases, and minimum stress becomes significant the interaction between the processes of creep and fatigue can lead to significant reductions in product life. Unified constitutive models in terms of internal variables representing the damage caused by creep and fatigue, and the damage caused by their interaction, have thus been proposed (Tong and Vermeulen, 2003).…”

Section: Creep/fatigue Damagementioning

confidence: 99%

Development of ligament tissue biodegradable devices: A review

Vieira

Guedes

Marques

2009

Journal of Biomechanics

115

101

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This bibliographic review is focused on ligament tissue rehabilitation, its anatomy-physiology, and, mainly, on the dimensioning considerations of a composite material solution. The suture strength is problematic during the tissue recovering, implying reduction of mobility for several months. However, early postoperative active mobilization may enable a faster and more effective recovering of tissue biomechanical functions. As the risk of tendon rupture becomes a significant concern, a repair technique must be used to withstand the tensile forces generated by active mobilization. However, to avoid stress shielding effect on ligament tissue, an augmentation device must be designed on stiffness basis, that preferably will decrease. Absorbable biocomposite reinforcements have been used to allow early postoperative active mobilization and avoid the shortcomings of current repair solutions. Tensile strength decrease of the repair, during the initial inflammatory phase, is expected, derived from oedema and tendon degradation. In the fibroblastic phase, stiffness and strength will increase, which will stabilize during the remodelling phase. The reinforcement should be able to carry the dynamic load due to locomotion with a mechanical behaviour similar to the undamaged natural tissue, during all rehabilitation process. Moreover, the degradation rate must also be compatible with the ligament tissue recovering. The selection and combination of different biodegradable materials, in order to make the biocomposite reinforcement functionally compatible to the damaged sutured tissue, in terms of mechanical properties and degradation rate, is a major step on the design process. Modelling techniques allow pre clinical evaluation of the reinforcement functional compatibility, and the optimization by comparison of different composite solutions in terms of biomechanical behaviour.

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Section: Creep/fatigue Damagementioning

confidence: 99%

Development of ligament tissue biodegradable devices: A review

Vieira

Guedes

Marques

2009

Journal of Biomechanics

115

101

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“…Generally, stress relaxation branches are better predicted using the optimised material constants rather than the initial estimates ( Figure 9 (c) and (d)), however the stress relaxation in the first cycles of data ( Figure 9 (b)) is not accurately predicted by either set. The difficulties in predicting creep behaviour for cyclically loaded specimens have been noted previous by Tong and Vermeulen [13] Zhan and Tong [12,23]; who suggested that the poor creep prediction may be due to neglecting static/time recovery effects in the Chaboche model [13]. A modification (applied to the kinematic hardening law) was suggested that appeared to address this deficiency [10,23], however this explanation does not suggest why creep behaviour is well predicted in later cycles in this case.…”

Section: Discussionmentioning

confidence: 74%

“…By decomposing the back stress into multiple components, transient and long term behaviour may be accounted for [13], here with a 1 and C 1 dictating the evolution of χ 1 (which describes initial kinematic non-linearity) and a 2 and C 2 dictating the evolution of χ 2 (describing asymptotic, stabalised behaviour), see Figure 3. The total back stress is given as the summation of these components; therefore for m components of back stress, the total back stress (χ) is given by equation 2.4.…”

Section: 3mentioning

confidence: 99%

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Effective determination of cyclic-visco-plasticity material properties using an optimisation procedure and experimental data exhibiting scatter

Rouse

Hyde

Sun

et al. 2013

Materials at High Temperatures

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“…Therefore, design against fatigue failure utilizes fatigue behaviour obtained through strain control fatigue tests. Creep and fatigue damages are generally studied using different models, even if some attempts to unify the material behaviour can be reached in literature [2,3]. Anyway, these models were developed and experimentally verified for high strain levels in case of fatigue and for high stress-temperature condition in case of creep.…”

Section: Introductionmentioning

confidence: 99%

Modification of creep and low cycle fatigue behaviour induced by welding

Carofalo¹,

Dattoma²,

Nobile³

et al. 2014

Frattura Ed Integrità Strutturale

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ABSTRACT. In this work, the mechanical properties of Waspaloy superalloy have been evaluated in case of welded repaired material and compared to base material. Test program considered flat specimens on base and TIG welded material subjected to static, low-cycle fatigue and creep test at different temperatures. Results of uniaxial tensile tests showed that the presence of welded material in the gage length specimen does not have a relevant influence on yield strength and UTS. However, elongation at failure of TIG material was reduced with respect to the base material. Moreover, low-cycle fatigue properties have been determined carrying out tests at different temperature (room temperature RT and 538°C) in both base and TIG welded material. Welded material showed an increase of the data scatter and lower fatigue strength, which was anyway not excessive in comparison with base material. During test, all the hysteresis cycles were recorded in order to evaluate the trend of elastic modulus and hysteresis area against the number of cycles. A clear correlation between hysteresis and fatigue life was found. Finally, creep test carried out on a limited number of specimens allowed establishing some changes about the creep rate and time to failure of base and welded material. TIG welded specimen showed a lower time to reach a fixed strain or failure when a low stress level is applied. In all cases, creep behaviour of welded material is characterized by the absence of the tertiary creep.

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The description of cyclic plasticity and viscoplasticity of waspaloy using unified constitutive equations

Cited by 41 publications

References 9 publications

Development of ligament tissue biodegradable devices: A review

Development of ligament tissue biodegradable devices: A review

Effective determination of cyclic-visco-plasticity material properties using an optimisation procedure and experimental data exhibiting scatter

Modification of creep and low cycle fatigue behaviour induced by welding

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