An investigation on blunt notch behavior of fiber metal laminates containing notch with different shapes

Sadeghpour, Ebrahim; Sadighi, Mojtaba; Dariushi, Soheil

doi:10.1177/0731684413484817

Cited by 20 publications

(9 citation statements)

References 24 publications

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“…Epoxy was uniformly spread upon the treated surface of Al‐sheets and woven glass fabrics. The system was maintained at room temperature under pressure for 24 h. As reported by Sadeghpour et al, [ 43 ] no residual stress has been created in the laminate, since the cure cycle was at room temperature. The average thickness of the fabricated GLAREs is 3.9 ±0.15 mm.…”

Section: Experimental Workmentioning

confidence: 99%

Experimental study on the improvement of mechanical properties of GLARE using nanofillers

El‐baky

Attia

2020

Polymer Composites

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The present study investigates the effect of halloysite clay nanotubes (HCNT S) on the mechanical properties of glass reinforced aluminum laminate (GLARE) as a very popular fiber metal laminate (FML). GLARE (3/2) with quasi-isotropic lay-up, [Al/[(0 /90)/(45 /−45)]s/Al/[(0 /90)/(45 /−45)]s/Al], filled with different wt% ofHCNTs (0, 0.25, 0.5, 1, 2, and 3 wt%) were fabricated using hand lay-up followed by compression molding. Tensile, flexural, and impact properties of the fabricated GLAREs were evaluated. The failure of the specimens was examined using field emissionscanning electron microscope (FE-SEM), energy-dispersive X-ray spectroscopy (EDX) and visual inspection. Test results demonstrated that the incorporation of HCNTs improves the mechanical properties of GLARE. Among the studied wt%, the inclusion of 1 wt% of HCNTs to GLARE leads to maximum improvements of 35.67%, 8.50%, 28.85%, 50.47%, 50.27%, 30.43%, and 51.52% in tensile strength, tensile strain, Young's modulus, modulus of toughness, flexural strength, flexural strain, and impact strength, respectively, was attained by adding 1 wt% of HCNTs to GLARE compared to pristine GLARE. Meanwhile, increasing HCNT S content to 3 wt% reverse the trend. FESEM showed that, HCNT S are well dispersed in epoxy. However, a higher weight fraction of HCNT S in epoxy, that is, 3 wt% leads little agglomerations.

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Section: Experimental Workmentioning

confidence: 99%

Experimental study on the improvement of mechanical properties of GLARE using nanofillers

El‐baky

Attia

2020

Polymer Composites

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“…In prior investigations, the effects of geometric parameters (notch shape and sizes of notch and specimen) [ 9 , 10 , 11 , 12 , 13 , 14 ], types and fractions of constituents [ 15 , 16 , 17 ], and interface adhesion [ 18 ] on mechanical response and damage behavior of FML with blunt notches were experimentally revealed. Moreover, finite element models [ 12 , 13 , 14 , 19 , 20 , 21 , 22 ] and analytical models, e.g., the point and average stress criteria [ 11 , 23 ] and effective crack growth model [ 24 ], were used to predict the notched strength, damage patterns, and damage evolution process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hole Arrangement on Failure Mechanism of Multiple-Hole Fiber Metal Laminate under On-Axis and Off-Axis Loading

et al. 2021

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Mechanical joints are commonly required in structures made of fiber metal laminate (FML), which pose a threat due to multi-site stress concentrations at rivet or bolt holes. Thus, for a reasonably designed FML joint, it is essential to characterize the failure mechanism of multiple-hole FML; however, little information about this has been found in open literature. In the present work, influences of hole arrangement and loading strategy (on-axis or off-axis) on the failure mechanism of multiple-hole FML were investigated, by performing finite element analyses and energy dissipation analyses with elastoplastic progressive damage models that took curing stress into account. Six types of specimens with holes arranged in parallel and staggered forms were designed, whose geometrical parameters were in strict accordance with those specified for composites joints. It indicated that the stress distribution, gross/net notched strength, critical fracture path, and damage evaluation process were only slightly influenced by the hole number and hole arrangement. On the other hand, they were strongly influenced by the loading strategy, due to the transition of failure domination. Results presented here can provide evidence for introducing design regulations of composite joints into the more hybrid FML, and for reasonably determining its multiple-hole strength merely based on the sing-hole specimen.

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“…It can be concluded that the initial fiber breakage occurred after the yield of FMLs, followed by the matrix damage. Sadeghpour et al 19 studied the effect of notch shapes on the ultimate notch strength and damage modes of FMLs. Their results exhibited that the circular holes fracture appeared at a point along the longitudinal direction and the square notches fracture occurred at the corner of square along the transverse direction.…”

Section: Introductionmentioning

confidence: 99%

Tensile mechanical behavior and failure mechanisms of multihole fiber metal laminates—Experimental characterization and numerical prediction

Wang

et al. 2020

Journal of Reinforced Plastics and Composites

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This work mainly investigates the effects of the hole number and layer direction on the tensile mechanical behavior and failure mechanisms of multihole fiber metal laminates by experimental and numerical methods. With the aid of digital image correlation technique, tensile tests are implemented to obtain mechanical responses of different multihole fiber metal laminates. Subsequently, numerical simulation considering thermal residual stress is conducted to elucidate the failure modes and progressive damage evolution of multihole fiber metal laminates, which integrates the progressive damage model of composite laminates and a cohesive zone model between aluminum sheet/composite laminates. Finally, numerical predictions are found in a good agreement with experimental measurements, in terms of mechanical responses and fracture morphologies. Results demonstrate that the number of holes has negligible influence on the ultimate tensile strength, whereas affects the final failure strain of multihole fiber metal laminates evidently. With the increase of layer direction, the fracture morphology changes from evident brittle fracture to fiber pull-out and matrix damage, which indicates that the critical failure mechanism of multihole fiber metal laminates changes from tension dominated to tension–shear dominated. Additionally, the longer loading history from initial damage to final failure of composite laminates demonstrates the significance of considering progressive damage behavior in numerical simulation.

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An investigation on blunt notch behavior of fiber metal laminates containing notch with different shapes

Cited by 20 publications

References 24 publications

Experimental study on the improvement of mechanical properties of GLARE using nanofillers

Experimental study on the improvement of mechanical properties of GLARE using nanofillers

Effect of Hole Arrangement on Failure Mechanism of Multiple-Hole Fiber Metal Laminate under On-Axis and Off-Axis Loading

Tensile mechanical behavior and failure mechanisms of multihole fiber metal laminates—Experimental characterization and numerical prediction

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