Fatigue behavior of thin-walled grade 2 titanium samples processed by selective laser melting. Application to life prediction of porous titanium implants

Lipiński, P.; Barbas, Alexandre; Bonnet, Anne Sophie

doi:10.1016/j.jmbbm.2013.08.011

Cited by 62 publications

(22 citation statements)

References 14 publications

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“…Internal defects on the capillary region and the surface roughness of the capillary could increase the local stress level and as a consequence affect the crack initiation behavior. This phenomena are extensively discussed by Lipinski et al [34]. However, in the current study the simulations do not take into account parameters such as defects or surface roughness.…”

Section: Resultsmentioning

confidence: 91%

“…This highlights the fact that an integrated capillary would not have a critical impact on the crack initiation in an SLM component. It should be mentioned that the capillary surface is expected to have roughness in the order of the powder particle [34]. Internal defects on the capillary region and the surface roughness of the capillary could increase the local stress level and as a consequence affect the crack initiation behavior.…”

Section: Resultsmentioning

confidence: 99%

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Fatigue of Ti6Al4V Structural Health Monitoring Systems Produced by Selective Laser Melting

et al. 2016

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Selective laser melting (SLM) is an additive manufacturing (AM) process which is used for producing metallic components. Currently, the integrity of components produced by SLM is in need of improvement due to residual stresses and unknown fracture behavior. Titanium alloys produced by AM are capable candidates for applications in aerospace and industrial fields due to their fracture resistance, fatigue behavior and corrosion resistance. On the other hand, structural health monitoring (SHM) system technologies are promising and requested from the industry. SHM systems can monitor the integrity of a structure and during the last decades the research has primarily been influenced by bionic engineering. In that aspect a new philosophy for SHM has been developed: the so-called effective structural health monitoring (eSHM) system. The current system uses the design freedom provided by AM. The working principle of the system is based on crack detection by means of a network of capillaries that are integrated in a structure. The main objective of this research is to evaluate the functionality of Ti6Al4V produced by the SLM process in the novel SHM system and to confirm that the eSHM system can successfully detect cracks in SLM components. In this study four-point bending fatigue tests on Ti6Al4V SLM specimens with an integrated SHM system were conducted. Fractographic analysis was performed after the final failure, while finite element simulations were used in order to determine the stress distribution in the capillary region and on the component. It was proven that the SHM system does not influence the crack initiation behavior during fatigue. The results highlight the effectiveness of the eSHM on SLM components, which can potentially be used by industrial and aerospace applications.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Fatigue of Ti6Al4V Structural Health Monitoring Systems Produced by Selective Laser Melting

et al. 2016

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“…20 In fact, many materials are known to fail under a number of loading cycles that is inversely related to the tensile stress applied to them. 18 And most recently, it has been shown that peak ACL strain increased in cadaver-simulated pivot landings as the available range of internal femoral rotation was decreased. 4 With ACL strain being positively related to ACL stress, 27 the results presented in the current study were expected; the number of loading cycles to failure was expected to decrease with limited femoral rotation.…”

Section: Discussionmentioning

confidence: 99%

Risk of Anterior Cruciate Ligament Fatigue Failure Is Increased by Limited Internal Femoral Rotation During In Vitro Repeated Pivot Landings

2015

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Background A reduced range of hip internal rotation is associated with increased peak anterior cruciate ligament (ACL) strain and risk for injury. It is unknown, however, whether limiting the available range of internal femoral rotation increases the susceptibility of the ACL to fatigue failure. Hypothesis Risk of ACL failure is significantly greater in female knee specimens with a limited range of internal femoral rotation, smaller femoral-ACL attachment angle, and smaller tibial eminence volume during repeated in vitro simulated single-leg pivot landings. Study Design Controlled laboratory study. Methods A custom-built testing apparatus was used to simulate repeated single-leg pivot landings with a 4×-body weight impulsive load that induces knee compression, knee flexion, and internal tibial torque in 32 paired human knee specimens from 8 male and 8 female donors. These test loads were applied to each pair of specimens, in one knee with limited internal femoral rotation and in the contralateral knee with femoral rotation resisted by 2 springs to simulate the active hip rotator muscles’ resistance to stretch. The landings were repeated until ACL failure occurred or until a minimum of 100 trials were executed. The angle at which the ACL originates from the femur and the tibial eminence volume were measured on magnetic resonance images. Results The final Cox regression model (P = .024) revealed that range of internal femoral rotation and sex of donor were significant factors in determining risk of ACL fatigue failure. The specimens with limited range of internal femoral rotation had a failure risk 17.1 times higher than did the specimens with free rotation (P = .016). The female knee specimens had a risk of ACL failure 26.9 times higher than the male specimens (P = .055). Conclusion Limiting the range of internal femoral rotation during repetitive pivot landings increases the risk of an ACL fatigue failure in comparison with free rotation in a cadaveric model. Clinical Relevance Screening for restricted internal rotation at the hip in ACL injury prevention programs as well as in individuals with ACL injuries and/or reconstructions is warranted.

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“…Although a range of porous samples have already been monotonically tested, the fatigue characterization of the porous scaffolds was not conducted. Other studies have investigated the mechanical properties of biomedical porous structures and have taken into account the fatigue characteristics (Lewis, 2013;Banhart, 2001;Landy et al, 2013;Lipinski et al, 2013;Yavari et al, 2013). For example, Banhart listed fatigue testing of porous scaffolds as a necessary destructive test in the characterization of potential biomedical materials.…”

Section: Introductionmentioning

confidence: 99%

Monotonic and cyclic loading behavior of porous scaffolds made from poly(para-phenylene) for orthopedic applications

Hoyt

Yakacki

Fertig

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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Fatigue behavior of thin-walled grade 2 titanium samples processed by selective laser melting. Application to life prediction of porous titanium implants

Cited by 62 publications

References 14 publications

Fatigue of Ti6Al4V Structural Health Monitoring Systems Produced by Selective Laser Melting

Fatigue of Ti6Al4V Structural Health Monitoring Systems Produced by Selective Laser Melting

Risk of Anterior Cruciate Ligament Fatigue Failure Is Increased by Limited Internal Femoral Rotation During In Vitro Repeated Pivot Landings

Monotonic and cyclic loading behavior of porous scaffolds made from poly(para-phenylene) for orthopedic applications

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