In-situ SEM study of crack initiation, propagation and interfacial debonding of Ni-P coating during tensile tests: Heat treatment effect

Bouaziz, Hanen; Brinza, Ovidiu; Haddar, Nader; Gaspérini, M.; Feki, M.

doi:10.1016/j.matchar.2016.11.017

Cited by 28 publications

(25 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This important decrease of the elongation at break can be explained by a weakening of the matrix due crosslinking mechanism and chains cut or/and an embrittlement of the composite microstructure more precisely the fiber/matrix interface weakening. Therefore it is important to choose the first aged specimen during this period in order to emphasize the local mechanisms at the origin of the brutal embrittlement occurring just before the beginning of oxidation (t iCO ) . The second specimen was taken once the oxidation products start to appear and the third one when the oxidation process begins to stabilize.…”

Section: Materials and Experimentalmentioning

confidence: 99%

“…Moreover, several authors reported that damage starts at the fiber ends and propagates along the interface before coalescence through matrix and failure. However, although the environmental conditions influence, mainly oxidation in the case of PP‐based composites, on the mechanical and physical properties have been investigated for many years and well understood , few studies were realized on the thermal aging influence on the local damage mechanisms of CFs‐reinforced polymer.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal aging influence on the damage mechanisms of fully recycled composite‐reinforced polypropylene/polyethylene blend

et al. 2019

View full text Add to dashboard Cite

The main aim of this work is to study the effect of thermal aging on damage mechanisms of a totally recycled composite. The studied material was elaborated by injection molding from a mixture of both recycled matrix (polypropylene‐polyethylene blend) and reinforcement (short carbon fibers). Damage mechanisms analysis was carried out using scanning electron microscope (in situ three point bending tests performed on specimens taken at different times of oxidation under different temperatures: 120, 130, and 140°C. Damage mechanisms were identified for different material states. It was shown that thermal aging affects the fiber–matrix interfacial zone while good adhesion between the reinforcement and the matrix was observed for the virgin sample. Furthermore, a quantitative analysis was performed at the local scale in a representative zone of the tensile area. Representative local damage indicators were defined. Results display clearly that damage evolutions always begin during the induction period. Thermal aging effect was then analyzed through the comparison of damage thresholds and kinetics for different material states after different times of oxidation. POLYM. COMPOS., 40:3342–3350, 2019. © 2019 Society of Plastics Engineers

show abstract

Section: Materials and Experimentalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal aging influence on the damage mechanisms of fully recycled composite‐reinforced polypropylene/polyethylene blend

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Using the "in situ tensile test in scanning electron microscope" allow to reveal that besides the amount and distribution of particles also morphology has essential influence on particles behaviour during failure. Also physical characteristics have significant impact on the matrix-particles interfacial strength [10][11][12]. From a review of the works devoted to the "in situ" failure methods of metal based composites all systems can be divided into two groups, namely a system with the plastic matrix (copper, aluminium based composites) where the deformation process until fracture can be closely monitored, and a system with the insufficiently plastic matrix where the deformation process is too fast and parameters of the deformation process, and fracture mechanism is difficult to identify (magnesium based composites).…”

Section: Introductionmentioning

confidence: 99%

Phases analysis and impact of phases on fracture mechanism of AZ61‐SiC composite

Besterci

Sülleiová

Ballóková

et al. 2019

Materialwissenschaft Werkst

View full text Add to dashboard Cite

Phase composition of AZ61‐SiC composite with 5 wt.% of nanosized silicon carbide reinforcement was analysed and failure mechanism by in situ tensile test in scanning electron microscope was observed. Microstructure of the experimental materials was heterogeneous with grain size of 15 μm. Based on the quantitative analysis of composite, besides, silicon carbide strengthened particles added externally into the matrix magnesium silicide, magnesium oxide, and aluminium/manganese particles formed in situ were found in the matrix. In situ tensile test in scanning electron microscope has shown that reinforcing particles substantially influenced failure mechanism. Large, brittle magnesium silicide particles (size of 40 μm–50 μm) cracked during tensile deformation and at the same time, as a result of different physical properties, decohesion of the matrix and smaller aluminium/manganese, silicon carbide and magnesium oxide particles (size of 5 μm–10 μm, 10 μm and 50 nm respectively) occurred. Reinforcing particles and brittle secondary phases driven micro voids and their coalescence was found as a major cause of large cracks formation. Subsequently the increase of stress caused the cracks propagation by the coalescence of fractured particles and decohesively release smaller dispersed particles. The fracture propagated at approximately 90° angle to the direction of the tensile load direction. Fracture surface had feature of transcrystalline and intercrystalline failure.

show abstract

“…Agrawal and Raj (A-R) [ 29 , 30 ] developed an experimental technique and analysis to evaluate the ultimate shear strength of a ceramic-metal interface. Due to its simplicity in experimental setup and its acceptable reliability in property prediction, the A-R model has been widely used in many reported works [ 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Furthermore, Chen et al [ 21 ] reported their modification of the sinusoidal profile of interfacial shear stress in the original A-R model and test results on a TiN (coating)—304 steel (substrate) system.…”

Section: Introductionmentioning

confidence: 99%

FEM Modeling of In-Plane Stress Distribution in Thick Brittle Coatings/Films on Ductile Substrates Subjected to Tensile Stress to Determine Interfacial Strength

2018

View full text Add to dashboard Cite

The ceramic-metal interface is present in various material structures and devices that are vulnerable to failures, like cracking, which are typically due to their incompatible properties, e.g., thermal expansion mismatch. In failure of these multilayer systems, interfacial shear strength is a good measure of the robustness of interfaces, especially for planar films. There is a widely-used shear lag model and method by Agrawal and Raj to analyse and measure the interfacial shear strength of thin brittle film on ductile substrates. The use of this classical model for a type of polymer derived ceramic coatings (thickness ~18 μm) on steel substrate leads to high values of interfacial shear strength. Here, we present finite element simulations for such a coating system when it is subjected to in-plane tension. Results show that the in-plane stresses in the coating are non-uniform, i.e., varying across the thickness of the film. Therefore, they do not meet one of the basic assumptions of the classical model: uniform in-plane stress. Furthermore, effects of three significant parameters, film thickness, crack spacing, and Young’s modulus, on the in-plane stress distribution have also been investigated. ‘Thickness-averaged In-plane Stress’ (TIS), a new failure criterion, is proposed for estimating the interfacial shear strength, which leads to a more realistic estimation of the tensile strength and interfacial shear strength of thick brittle films/coatings on ductile substrates.

show abstract

In-situ SEM study of crack initiation, propagation and interfacial debonding of Ni-P coating during tensile tests: Heat treatment effect

Cited by 28 publications

References 33 publications

Thermal aging influence on the damage mechanisms of fully recycled composite‐reinforced polypropylene/polyethylene blend

Thermal aging influence on the damage mechanisms of fully recycled composite‐reinforced polypropylene/polyethylene blend

Phases analysis and impact of phases on fracture mechanism of AZ61‐SiC composite

FEM Modeling of In-Plane Stress Distribution in Thick Brittle Coatings/Films on Ductile Substrates Subjected to Tensile Stress to Determine Interfacial Strength

Contact Info

Product

Resources

About