Second-order fatigue of intrinsic mean stress under random loadings

Calderon-Uriszar-Aldaca, I.; Biezma, M. V.; Matanza, Amaia; Briz, Estíbaliz; Bastidas, David M.

doi:10.1016/j.ijfatigue.2019.105257

Cited by 7 publications

(6 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fact, it undergoes deterioration processes related to fatigue, because a bone suffers from cyclic loadings and equivalent biological remodelling acting such as corrosion, since the scaffold material is progressively removed and substituted by bone tissue and this points for an initial deterioration up to a valley point where it starts to recover mechanical properties. Accordingly, the best approach is to develop a simplified model to take into account these two deterioration processes during service life, such as those presented by Calderon Uriszar-Aldaca et al [50][51][52], developing an additional correction factor to take these into account.…”

Section: Discussionmentioning

confidence: 99%

Size Effects in Finite Element Modelling of 3D Printed Bone Scaffolds Using Hydroxyapatite PEOT/PBT Composites

Calderon-Uriszar-Aldaca

Perez

Sinha

et al. 2021

Mathematics

Self Cite

View full text Add to dashboard Cite

Additive manufacturing (AM) of scaffolds enables the fabrication of customized patient-specific implants for tissue regeneration. Scaffold customization does not involve only the macroscale shape of the final implant, but also their microscopic pore geometry and material properties, which are dependent on optimizable topology. A good match between the experimental data of AM scaffolds and the models is obtained when there is just a few millimetres at least in one direction. Here, we describe a methodology to perform finite element modelling on AM scaffolds for bone tissue regeneration with clinically relevant dimensions (i.e., volume > 1 cm3). The simulation used an equivalent cubic eight node finite elements mesh, and the materials properties were derived both empirically and numerically, from bulk material direct testing and simulated tests on scaffolds. The experimental validation was performed using poly(ethylene oxide terephthalate)-poly(butylene terephthalate) (PEOT/PBT) copolymers and 45 wt% nano hydroxyapatite fillers composites. By applying this methodology on three separate scaffold architectures with volumes larger than 1 cm3, the simulations overestimated the scaffold performance, resulting in 150–290% stiffer than average values obtained in the validation tests. The results mismatch highlighted the relevance of the lack of printing accuracy that is characteristic of the additive manufacturing process. Accordingly, a sensitivity analysis was performed on nine detected uncertainty sources, studying their influence. After the definition of acceptable execution tolerances and reliability levels, a design factor was defined to calibrate the methodology under expectable and conservative scenarios.

show abstract

Section: Discussionmentioning

confidence: 99%

Size Effects in Finite Element Modelling of 3D Printed Bone Scaffolds Using Hydroxyapatite PEOT/PBT Composites

Calderon-Uriszar-Aldaca

Perez

Sinha

et al. 2021

Mathematics

Self Cite

View full text Add to dashboard Cite

show abstract

“…For that purpose, additional strength tests are required to ensure the welding is performing at least as good as the base materials. Besides, cyclic loadings can cause the appearance of such macrodefects, even later unleashing corrosion fatigue problems [33,34], and even permanent tensions can cause development of stress corrosion cracking if weld bead suddenly changes geometry or accelerates corrosion fatigue deterioration [35,36].…”

Section: Discussionmentioning

confidence: 99%

The Weldability of Duplex Stainless-Steel in Structural Components to Withstand Corrosive Marine Environments

Calderon-Uriszar-Aldaca

Briz

García

et al. 2020

Metals

Self Cite

View full text Add to dashboard Cite

There is still a considerable gap in the definition of the weldability of Duplex Stainless Steel (DSS). A lack of clarity that is explained by the standard specification of the maximum content of equivalent carbon that defines a “weldable” steel coupled with the fact that the alloying elements of DSS exceed this defined limit of weldability. In this paper, welding quality in an inert environment and in presence of chlorides is analyzed with the aim of defining optimum welding conditions of 2001, 2304, and 2205 DSS. The same procedure is followed for a hybrid weld between DSS 2205 and a low carbon mild steel, S275JR. As main output, this study defined the optimal welding conditions with tungsten inert gas without filler for each type of DSS weld that showed excellent anti-corrosion performance, with the exception of the DSS 2205-S275JR weld where widespread corrosion was observed. Additionally, this study established a relationship between the thermal input during welding and the content of alloying elements in defect-free joints. Furthermore, it demonstrated that an increase in ferrite content did not lead to a worse corrosion resistance, as expected after passivation.

show abstract

“…Zengah et al (2013) have studied fatigue life prediction by the rain-flow cycle counting and concluded a production of good results for random histories. Furthermore, new fatigue models and new cycle counting systems are expressed by Calder on-Ur ıszar- Aldaca et al (2020), taking into account the effects of average stresses on fatigue life. Therefore, in such cases, the effect of mean stress on fatigue lifetime under random loading should not be ignored.…”

Section: Introductionmentioning

confidence: 99%

“…However, Salvinder et al (2016) studied the effect of mean stress using the Rainflow cycle counting technique to assess the fatigue damage employing the crankshaft. That way, the influence of mean stress on fatigue lifetime under random loading was considered by several works (Calderón-Uríszar-Aldaca et al , 2020; Sersar et al , 2006), but not presenting the cyclic responses or the hysteresis curves using cycle counting, allowed us to predict the fatigue behavior under random loading of materials.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of fatigue damage under random loading using Rainflow cycle counting

Kebir

Correia

Benguediab

et al. 2020

IJSI

View full text Add to dashboard Cite

PurposeThe purpose of this scientific work is to simulate the fatigue damage under random loading, taking into account the mean stress effect on fatigue lifetime and using the Rainflow counting technique to assess the fatigue damage by the Ansys software. The used material is aluminum alloy 6082-T6. A comparison with literature results has confirmed this investigation in this paper.Design/methodology/approachThe study of fatigue under random loading is based on the same concepts as constant loading with the addition of damage summation. The proportion of damage caused by a stress cycle depends not only on the alternating stress but also on the mean stress.FindingsAnalysis of the fatigue damage shows that the number of relative damage due to each cycle.Originality/valueThis paper aims to simulate the fatigue damage under random loading for aluminum alloys.

show abstract

Second-order fatigue of intrinsic mean stress under random loadings

Cited by 7 publications

References 34 publications

Size Effects in Finite Element Modelling of 3D Printed Bone Scaffolds Using Hydroxyapatite PEOT/PBT Composites

Size Effects in Finite Element Modelling of 3D Printed Bone Scaffolds Using Hydroxyapatite PEOT/PBT Composites

The Weldability of Duplex Stainless-Steel in Structural Components to Withstand Corrosive Marine Environments

Numerical study of fatigue damage under random loading using Rainflow cycle counting

Contact Info

Product

Resources

About