Behaviour of sandwich structures with cork compound cores subjected to blast waves

Sousa-Martins, J.; Kakogiannis, Dimitrios; Coghe, F.; Reymen, Bruno; Teixeira-Dias, Filipe

doi:10.1016/j.engstruct.2012.07.030

Cited by 39 publications

(21 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Alcântara et al [16] developed a specific type of cork composite for absorption of impact energy of filled tubular structures. Sousa-Martins et al [17] subjected sandwich structures with cork compound cores to blast waves, were the core had a major part in energy absorption. Sanchez-Saez et al [18] structure thin plates of aluminum with a cork core, they increased the energy absorption in 30% when compared to a structure without the cork core for impacts of 300 J of energy.…”

mentioning

confidence: 99%

Static and dynamic mechanical response of different cork agglomerates

et al. 2015

View full text Add to dashboard Cite

a b s t r a c tCork is a natural cellular material capable of withstanding considerable amounts of energy and exhibiting a viscoelastic return to its original shape. This feature is particularly interesting to resist to successive impacts. In this study, the behavior of different types of agglomerated cork (AC) and expanded cork (EC) is investigated under static and dynamic loadings. Double impact was carried out on the samples using a hemispheric actuator. The peak acceleration data for all compounds were further analyzed. Static compression tests gave an interesting insight into the stress-strain curve of agglomerates and Poisson's ratio variation during deformation. Results demonstrate a clear influence of agglomerated density and grain size on the resulting mechanical properties and point out a tremendous potential for this sustainable material to be tailored to fit diverse crashworthiness applications.

show abstract

mentioning

confidence: 99%

Static and dynamic mechanical response of different cork agglomerates

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Based on the design of experiment (DoE) and surrogate modeling, exhaustive studies on crashworthiness of various thin-walled tubes have addressed the issues in mechanical properties of tube materials and foam-filler, energy absorption characteristics, and effects of structural size and shape, etc. (Hou et al, 2009Jones, 1998;Craig et al, 2005;Sousa-Martins et al, 2013). Based upon experimental and numerical analyses, the energy-absorption capacity of the circular tubes appears better than that of the square or rectangular tubes under the same conditions (Thornton and Edwards, 1982;Mamalis et al, 1992;Lu and Yu, 2003).…”

Section: Introductionmentioning

confidence: 90%

Crashworthiness optimization of new thin-walled cellular configurations

Hou

Zhang²,

Yang³

et al. 2014

Engineering Computations

View full text Add to dashboard Cite

Purpose -The purpose of this paper is to optimize a new thin-walled cellular configurations with crashworthiness criteria, so as to improve the crashworthiness of components of a vehicle body. Design/methodology/approach -ANSYS Parametric Design Language is used to create the parameterized models so that the design variables can be changed conveniently. Moreover, the surrogate technique, namely response surface method, is adopted for fitting objective and constraint functions. The factorial design and D-optimal criterion are employed to screen active parameters for constructing the response functions of the specific energy absorption and the peak crushing force. Finally, sequential quadratic programming-NLPQL is utilized to solve the design optimization problem of the new cellular configurations filled with multi-cell circular tubes under the axial crushing loading. Findings -Two kinds of distribution modes of the cellular configurations are first investigated, which are in an orthogonal way and in a diamond fashion. After comparing the optimized configurations of the rectangular distribution with the annular distribution of the multi-cell fillers, it is found that the orthogonal way seems better in the aspects of crashworthiness than the diamond fashion. Originality/value -The two new thin-walled cellular configuration are studied and optimized with the crashworthiness criteria. Study on the new cellular configurations is very valuable for improving the crashworthiness of components of a vehicle body. Meanwhile, the factorial design and the factor screening are adopted in the process of the crashworthiness optimization of the new thin-walled cellular configurations.

show abstract

“…In order to analyze the dynamic behavior and tool deviations, a dynamic model of a 3-axis gantry milling machine considering axis coupling effects was proposed by Wang et al [18]. Sandwich structures are commonly used materials for lightweight designs, and their mechanical behaviors are based on their structural features: They are built from two layers, i.e., a stiff and strong skin layer, and a compliant and lightweight core layer [19]. There have been a number of applications in civil and military aircrafts, launch vehicles, wind turbine blades, and marine structures in which composite and sandwich material systems were used as primary structures [20].…”

Section: Introductionmentioning

confidence: 99%

Design Optimization Approach of a Large-Scale Moving Framework for a Large 5-Axis Machining Center

et al. 2018

View full text Add to dashboard Cite

The traditional machine tool design method with metal materials makes large-scale moving structures very heavy, which seriously impacts dynamic performance and results in significant energy consumption. Using sandwich structures of composite materials to replace metal materials is an important strategy for lightweight large-scale moving structures. However, this kind of substitution is generally believed to be difficult because foam-filled sandwich structures usually show nonlinear characteristics and must balance the moving mass, material costs, and structural stiffness. In the present study, we proposed a design optimization approach for a large-scale moving framework in a large 5-axis machining center (L5AMC) considering large dimensions in the x, y, and z work space and high machining speed with the aim of minimizing the displacements of the milling head. An improved approach, named the 3-step design optimization, was executed to obtain the optimum framework structures to solve the contradiction between the moving mass, material costs, and structural stiffness. This approach was based on multi-objective optimization and finite element analysis. The structural stiffness of the framework after optimization increased by 89% compared with before optimization although the mass increased by 6% and the material costs increased by 9%. A finite element simulation under four given operational loads showed that the displacements of the milling head were all less than the design requirement of 0.25 mm. The results indicated that the proposed 3-step design optimization approach for the optimal design of a large-scale moving framework was feasible and successful. A 40 m × 6 m × 4 m L5AMC prototype was manufactured, and the actual verification results indicated that the large-scale moving framework fully met the design requirements of the L5AMC and reduced energy consumption.

show abstract

Behaviour of sandwich structures with cork compound cores subjected to blast waves

Cited by 39 publications

References 18 publications

Static and dynamic mechanical response of different cork agglomerates

Static and dynamic mechanical response of different cork agglomerates

Crashworthiness optimization of new thin-walled cellular configurations

Design Optimization Approach of a Large-Scale Moving Framework for a Large 5-Axis Machining Center

Contact Info

Product

Resources

About