Investigation of debonding growth between composite skins and corrugated foam-composite core in sandwich panels under bending loading

Bahabadi, Hossein Malekinejad; Farrokhabadi, Amin; Rahimi, Gholam Hossein

doi:10.1016/j.engfracmech.2020.106987

Cited by 30 publications

(14 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A sandwich composite three-point bending test was simulated using FEM with CZM in the commercial code Abaqus to acquire stress and strain distributions of the skin. 63,64 These were difficult to acquire by the DIC technique due to the limitation to include the entire skins into the region of 60 Tensile and shear properties of the skin were investigated through the ASTM E8 65 and ASTM D3518 66 standards, respectively. The skin properties are listed in Table 9.…”

Section: Resin Uptake Effect On Flexural Properties Of Sandwich Compositesmentioning

confidence: 99%

The effect of resin uptake on the flexural properties of compression molded sandwich composites

et al. 2021

View full text Add to dashboard Cite

Resin uptake plays a critical role in the stiffness-to-weight ratio of wind turbine blades in which sandwich composites are used extensively. This work examines the flexural properties of nominally half-inch thick sandwich composites made with polyvinyl chloride (PVC) foam cores (H60 and H80; PSC and GPC) at several resin uptakes. We found that the specific flexural strength and modulus for the H80 GPC sandwich composites increase from 82.04 to 90.70 kN Á m/kg and 6.03 to 7.13 MN Á m/kg, respectively, with 11.0% resin uptake reduction, which stands out among the four core sandwich composites. Considering reaching a high stiffness-to-weight ratio while preventing resin starvation, 32% to 38% and 40% to 45% resin uptakes are adequate ranges for the H80 PSC and GPC sandwich composites, respectively. The H60 GPC sandwich composites have lower debonding toughness than H60 PSC due to stress concentration in the smooth side skin-core interphase region. The ailure mode of the sandwich composites depends on the core stiffness and surface texture. The H60 GPC sandwich composites exhibit core shearing and bottom skincore debonding failure, while the H80 GPC and PSC sandwich composites show top skin cracking and core crushing failure. The findings indicate that an appropriate range of resin uptake exists for each type of core sandwich composite, and that within the range, a low-resin uptake leads to lighter blades and thus lower cyclic gravitational loads, beneficial for long blades.

show abstract

Section: Resin Uptake Effect On Flexural Properties Of Sandwich Compositesmentioning

confidence: 99%

The effect of resin uptake on the flexural properties of compression molded sandwich composites

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Bahabadi et al [20] analyzed the debonding in sandwich structures with three different geometries, including simple foam core without any corrugated composite, longitudinal trapezoid and square cores, and manufactured as waved (corrugated) composite core. In another study on the influence of face sheet thickness, corrugation thickness, boundary condition and foam filling on shock mitigation resulted that foam filling reduced the deflection of the panels in all cases [19].…”

Section: /1mentioning

confidence: 99%

Corrugated Structure Reinforcing Aluminum Foam

Durante¹,

Boccarusso²,

Formisano³

et al. 2021

Esaform 2021

View full text Add to dashboard Cite

Metal foams have a number of established niche market and potential applications under investigation due to their peculiarities including thermal, acoustic and mechanical properties at low weight. In order to produce structures resistant at high temperature and acting as barrier to the fire, metals with closed cells are often required, and one of the most consolidate manufacturing process for their production is the gas releasing particles decomposition in semisolids, by means of which a foam is created by a foaming agent dispersed into a precursor. In previous researches, the authors have investigated the possibility of foaming the aluminum starting by a precursor, placed between two skins consisting of steel grids, in order to obtain a sandwich structure at the same time of the foaming step. In line to continue on this topic and to improve the compression strength of the aluminum-foamed core, in this work the steel grid was used both as skins and as a corrugated skeleton inside the core. Different types of sandwich structures were manufactured, following some experimental tests executed to determine the optimal value of temperature and time to foam the precursor. Then, compression tests were carried out, in order to investigate the effectiveness of the proposed solution on the improvement of this mechanical behavior. The mechanical tests highlighted the increase of mechanical properties using this type of corrugated core.

show abstract

“…23 In the composite sandwich panel, the face sheets are attached to the core by resins, which may cause slippage between them when bent. 24 , 25 The slippage effect of the face sheets on the core can be eradicated at the sandwich structures by the 3D printing process.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation for enhancing the energy absorption capacity of the novel three-dimensional printed sandwich structures

Geramizadeh

Dariushi

Salami

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

The current study focuses on designing the optimal three-dimensional printed sandwich structures. The main goal is to improve the energy absorption capacity of the out-of-plane honeycomb sandwich beam. The novel Beta VI and Alpha VI were designed in order to achieve this aim. In the Beta VI, the connecting curves (splines) were used instead of the four diagonal walls, while the two vertical walls remained unchanged. The Alpha VI is a step forward on the Beta VI, which was promoted by filleting all angles among the vertical walls, created arcs, and face sheets. The two offered sandwich structures have not hitherto been provided in the literature. All models were designed and simulated by the CATIA and ABAQUS, respectively. The three-dimensional printer fabricated the samples by fused deposition modeling technique. The material properties were determined under tensile, compression, and three-point bending tests. The results are carried out by two methods based on experimental tests and finite element analyses that confirmed each other. The achievements provide novel insights into the determination of the adequate number of unit cells and demonstrate the energy absorption capacity of the Beta VI and Alpha VI are 23.7% and 53.9%, respectively, higher than the out-of-plane honeycomb sandwich structures.

show abstract

Investigation of debonding growth between composite skins and corrugated foam-composite core in sandwich panels under bending loading

Cited by 30 publications

References 38 publications

The effect of resin uptake on the flexural properties of compression molded sandwich composites

The effect of resin uptake on the flexural properties of compression molded sandwich composites

Corrugated Structure Reinforcing Aluminum Foam

Numerical and experimental investigation for enhancing the energy absorption capacity of the novel three-dimensional printed sandwich structures

Contact Info

Product

Resources

About