Abstract:Different detailed finite element model alternatives are developed to come up with the most reliable finite element model of the sandwich panel, with the actual honeycomb core geometry, to evaluate the existing equivalent continuum models of aluminum honeycomb cores. Finite element models of sandwich panels with effective elastic constants of the honeycomb core are generated based on the existing continuum models of the honeycomb core. The evaluation of the effective elastic constants of honeycomb cores is bas… Show more
“…Using this comparison, they compiled the best equivalent orthotropic model amongst the available models. The orthotropic model identified by Aydincak and Kayran [22] listed in Table 3 is used here to represent the orthotropic properties of the core. Honeycomb core geometry considered for deducing effective orthotropic properties are shown in Figure 3.…”
Section: Methodsmentioning
confidence: 99%
“…Isotropic properties are assigned for the face sheets in this simulation. The model proposed by Aydincak and Kayran [22] helps to represent the honeycomb as a simple rectangular bar but with equivalent orthotropic properties that depend on the core design parameters such as cell size, shape, thickness, height, etc. Figure 3.Honeycomb core geometry.…”
Metallic thermal protection systems are used to protect the airframe and pay load from aerodynamic and aerothermal heating in hypersonic cruise vehicles that are powered with advanced scramjet engines. Metallic thermal protection systems is a composite structure that contains honeycomb sandwich panels at the top and bottom and a variety of thermal insulating materials placed in between them. Several design factors influence the structural and thermal performance of the honeycomb sandwich panels. Panel bending stiffness is one important structural property that is generally estimated using a destructive 3-point or 4-point bending test. In this study, a numerical model based on the impulse excitation nondestructive evaluation technique has been developed to estimate the effect of various design parameters that affect the bending stiffness of the honeycomb sandwich panels. The results obtained are analyzed using standard statistical procedures. A major advantage of this method lies in evaluating the panel stiffness at the design stage without resorting to actual fabrication of the panels for destructive testing.
“…Using this comparison, they compiled the best equivalent orthotropic model amongst the available models. The orthotropic model identified by Aydincak and Kayran [22] listed in Table 3 is used here to represent the orthotropic properties of the core. Honeycomb core geometry considered for deducing effective orthotropic properties are shown in Figure 3.…”
Section: Methodsmentioning
confidence: 99%
“…Isotropic properties are assigned for the face sheets in this simulation. The model proposed by Aydincak and Kayran [22] helps to represent the honeycomb as a simple rectangular bar but with equivalent orthotropic properties that depend on the core design parameters such as cell size, shape, thickness, height, etc. Figure 3.Honeycomb core geometry.…”
Metallic thermal protection systems are used to protect the airframe and pay load from aerodynamic and aerothermal heating in hypersonic cruise vehicles that are powered with advanced scramjet engines. Metallic thermal protection systems is a composite structure that contains honeycomb sandwich panels at the top and bottom and a variety of thermal insulating materials placed in between them. Several design factors influence the structural and thermal performance of the honeycomb sandwich panels. Panel bending stiffness is one important structural property that is generally estimated using a destructive 3-point or 4-point bending test. In this study, a numerical model based on the impulse excitation nondestructive evaluation technique has been developed to estimate the effect of various design parameters that affect the bending stiffness of the honeycomb sandwich panels. The results obtained are analyzed using standard statistical procedures. A major advantage of this method lies in evaluating the panel stiffness at the design stage without resorting to actual fabrication of the panels for destructive testing.
“…In many cases, it would be beneficial to simplify the model to a three-layer sandwich panel with a continuum core. Detailed core model could be used to determine effective elastic properties of the core as proven in similar research on sandwich-type materials with honeycomb core [44,45].…”
A series of experimental tests have been carried out on three types of novel sandwich panels mainly designed for application in lightweight mobile housing. Two types of the panels are manufactured entirely from wood-based materials while the third one presents a combination of plywood for surfaces and corrugated thermoplastic composite as a core part. All sandwich panels are designed to allow rapid one-shot manufacturing. Mechanical performance has been evaluated in four-point bending comparing the data to the reference plywood board. Additionally, finite element simulations were performed to evaluate global behavior, stress distribution and provide the basis for a reliable design tool. Obtained results show sufficient mechanical characteristics suitable for floor and wall units. Compared to a solid plywood board, sandwich alternative can reach up to 42% higher specific stiffness, at the same time maintaining sufficient strength characteristics.
“…The further application of developed numerical model could be derivation of equivalent continuum layer formulation in design of the large scale sandwich panels. Similar approach has been taken by several researchers mainly for aluminium honeycomb core [6] or honeycomb core with foam filler [7].…”
Section: Introductionmentioning
confidence: 88%
“…Horizontal displacements and strains on specimen surface and on the numerical model (on the left) Thermal model validation Validation of thermal model has been performed comparing numerically acquired heat flux values with the same values acquired from experimental tests according ISO 8990[7] standard. For specimen with 60 mm thickness, average experimentally measured heat flux is 35.5 W/m 2 .…”
This paper deals with the numerical simulation of mechanical and thermal behaviour of cellular wood material, DendroLight ®. The commercial computer code ANSYS is used. DendroLight ® is a cellular wood material made of profiled wood boards stacked in layers perpendicular to each other and then sliced once more in plates perpendicularly to the board layers. Gained weight saving of such a solution is approximately 60 % compared to the solid wood, allow to present this type of solution as core structure for sandwich panels in the furniture industry. Complex structure and orthotropic wood mechanical behaviour makes it inconvenient task to model in sufficient detail the core structure by any numerical simulations. Therefore special attention has been devoted to experimental validation of elaborated mechanical and thermal resistance models. Series of coupon scale sandwich panels with DendroLight ® core has been tested in bending mode and pure compression. In addition to traditional deformation measuring methods, non-contact optical measuring system ARAMIS has also been employed. In general a good agreement between the finite element simulation and physical experiments has been confirmed. Scatter among acquired experimental and numerical results is within the 20 % margins. Another challenge was to develop a numerical model to be as simple as possible in order to reduce the computer calculation time. Therefore shell elements have been used for wood frame simulation instead of solid elements in ANSYS.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
