On the influence of mechanical loadings on the porosities of structural epoxy adhesives joints by means of in-situ X-ray microtomography

Dumont, Vincent; Bădulescu, Claudiu; Stamoulis, Georgios; Adrien, Jérôme; Maire, Éric; Lefèvre, Arthur; Thévenet, David

doi:10.1016/j.ijadhadh.2020.102568

Cited by 13 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The geometry is given in figure1a. It is close to the geometry used by Dumont et al for in-situ X-ray microtomography tests[4]. The thickness of the…”

supporting

confidence: 74%

“…The pores are more or less homogeneously distributed within the adhesive (even when close to a free edge). Post-mortem observations have also demonstrated that cracks could be initiated in the vicinity of these pores [4].…”

Section: Introductionmentioning

confidence: 98%

“…Such an approach, termed damage tolerance, requires the development of experiments and models in order to investigate the nature of defects and their effect on the load at failure. Recent results obtained by Dumont et al using X-ray microtomography [4] have highlighted the presence of pores after the manufacturing process. These pores are quasi-spherical with a radius that should be smaller than 20 µm and the typical pore ratio is around 2%-3%.…”

Section: Introductionmentioning

confidence: 99%

“…These results demonstrate that larger pores do not necessarily result in a higher knock-down factor. Since the objective is to determine whether pores that are barely detectable by NDT have an effect on the load at initiation or at failure, below the size of the pore is chosen equal to 20µm (which is the limit of detection using X-ray tomography in [4]).…”

mentioning

confidence: 99%

See 3 more Smart Citations

Theoretical study based on 2D assumptions of the influence of small pores on crack initiation in adhesively bonded joints

Carrère

Doitrand

Martín

et al. 2021

International Journal of Adhesion and Adhesives

View full text Add to dashboard Cite

The intrinsic performance of epoxy adhesives seems to designate them as the ideal solution for assembling certain materials. Pore can have an influence on the load at which the first crack is initiated and on the final strength. In the context of damage tolerance, this work aims to explore the effect of small voids that cannot be detected by conventional non-destructive testing (NDT). To attain this goal, a method based on a criterion coupling strength and toughness is used. 2D finiteelement calculations are performed on simple configurations to understand the steps leading to failure when pores are present. When the defects are far from the edges, the loss in load at the initiation of the first crack is a function of the minimum distance between two pores. When the location of the defect interacts with the stress concentration due to a free edge, this loss is a function of the minimum spacing between pores and the free edge. The knock-down factor on the load at failure for a bonded joint with epoxy adhesives remains small (close to the defect area divided by the total area of the bondline). The presence of pores may change the fracture surface (from an adhesive one without pore to a cohesive one with pores).

show abstract

“…The geometry is given in figure1a. It is close to the geometry used by Dumont et al for in-situ X-ray microtomography tests[4]. The thickness of the…”

supporting

confidence: 74%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Theoretical study based on 2D assumptions of the influence of small pores on crack initiation in adhesively bonded joints

Carrère

Doitrand

Martín

et al. 2021

International Journal of Adhesion and Adhesives

View full text Add to dashboard Cite

show abstract

“…X‐ray tomography can be used to identify cracks and damage evolution inside different engineering materials as well as adhesives and bonded joints 38–41 . Wu et al 42 studied damage accumulation and evolution in different engineering materials such as polymeric composites and metal matrix composites using synchrotron radiation X‐ray computed microtomography.…”

Section: Introductionmentioning

confidence: 99%

On the static and fatigue life of nano‐reinforced Al‐GFRP bonded joints under different dispersion treatments

Zamani

Alaei

Silva

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

As bonded components of engineering structures inevitably experience fatigue loading conditions during their service life, it is significant to find ways to enhance their endurance. Also, adding nanoparticles to the adhesive can be introduced as an approach to design more durable bonded joints. In this way, it is important to determine a nanoparticle dispersion method which can lead to the longest fatigue life. Accordingly, this paper aims to investigate the influence of various nanoparticle dispersion treatments on static and fatigue responses of aluminum‐to‐composite bonded joints under four‐point bending. For this purpose, four dispersion techniques of mechanical stirring, bath‐sonication, low‐power and high‐power probe‐sonication were used to disperse nanoparticles into the adhesive. Also, four specimen groups of neat (with no additive particles), graphene nano platelet (GNP)‐reinforced, nano silica‐reinforced, and hybrid‐reinforced (including GNP + nano silica) were prepared. Results indicated that, for the joints including GNPs, the longest fatigue life was achieved for the specimens prepared by low‐power sonication method, while for hybrid‐type reinforcements, using high‐power method led to the highest endurance. Moreover, for 0.5 and 1.0 wt.% of nano silica, the endurance of bath‐sonicated specimens was 12.77% and 9.28% longer than low and high‐power probe‐sonicated joints, respectively. Using the backface strain (BFS) measurement technique, the influence of dispersion methods was studied on extending the crack initiation life (CIL) of each joint group. It was revealed that, for 0.5 wt.% and 1.0 wt.% of nano silica, the CIL is independent of the dispersion method, while, for 1.5 wt.%, probe sonicated specimens had the longest CIL. The microstructural characterization of each dispersion method and major reinforcing mechanisms were interpreted by scanning electron microscopy (SEM). For future researches, using X‐ray tomography and health monitoring methods is recommended to detect size and location of damage for nanoparticle reinforced composite structures.

show abstract

Damage Recognition of Acoustic Emission and Micro-CT Characterization of Bi-adhesive Repaired Composites Based on the Machine Learning Method

Ji,

Liang,

Zheng

et al. 2024

Appl Compos Mater

View full text Add to dashboard Cite

On the influence of mechanical loadings on the porosities of structural epoxy adhesives joints by means of in-situ X-ray microtomography

Cited by 13 publications

References 23 publications

Theoretical study based on 2D assumptions of the influence of small pores on crack initiation in adhesively bonded joints

Theoretical study based on 2D assumptions of the influence of small pores on crack initiation in adhesively bonded joints

On the static and fatigue life of nano‐reinforced Al‐GFRP bonded joints under different dispersion treatments

Damage Recognition of Acoustic Emission and Micro-CT Characterization of Bi-adhesive Repaired Composites Based on the Machine Learning Method

Contact Info

Product

Resources

About