Evaluation on crashworthiness and energy absorption of. Therefore, composite structure properties regarding crashworthiness are still the main functions or important criteria when forming the design within the energy absorption tube. This is commonly tested when investigating the safety of aircraft and vehicles. Both crown trigger and bevel trigger can effectively control the position of crushing. In every crashworthiness structural study, the cle value that is close to the unity value will display better performance in the energyabsorbing structure, making it more qualified in the application of energy absorption tubes. The finite element method is used to analyse and design energy absorption structure in aircraft crashworthiness problem. The effect of geometrical parameters on the energy.
Energy absorption structures design of civil aircraft to. In the present work, a bioinspired design strategy for aluminum alloy thinwalled structures is proposed to improve the performance of outofplane crashworthiness by altering the material distribution. Metal foams for improved crash energy absorption in. On a new crush trigger for energy absorption of composite. It is observed that all tubes are crushed in a brittle fracturing mode.
Energy absorption analysis of various vehicles under crash. High efficiency energy absorption structures such as the foam and sinewave beam are employed as the bottom structure for both of hla and lmca. The performance parameters, namely the peak load, absorbed crash energy, specific energy. The crash energy absorption of the veidcles front structures paulius griskeviciusl, antanas ziliukas2 dept of mechanics of solids, kaunas university of technology, kstucio g. Energy absorption of aircraft structures as an aspect of. The higher mechanical characteristics and mass specific energy absorption capabilities of composite materials motivate their use in large primary structures as well as structural and crashworthy components over more traditional metallic designs. As a matter of fact, two different crushing modes can occur. Crashworthiness evaluation of an energyabsorption experimental troop seat concept technical report avser 6411 by langston w. Energy absorption in polymer composite materials for automotive. This would not meet the favourable requirements of best energy absorption design in the application. Multidisciplinary design study of heavy vechical rupd crashworthiness and energy absorption international organization of scientific research 49 p a g e fig 1. Predictive technology development and crash energy. Energy absorption capability and crashworthiness of. Crashworthiness characteristics of natural ramiebioepoxy.
Thin shells are the main structures of energy absorbing in transportation applications for collisions. Energy absorbing structures, crashworthiness, impact loading, foam filled, functionally graded thickness, multicell, crashworthiness design. The proportion of energy dissipated by different mechanisms on total energy absorption for m2 is plotted in fig. Standardization of numerical and experimental methods for crashworthiness energy absorption of composite materials paolo feraboli aeronautics and astronautics university of washington presented at the jams annual meeting june 1719, 2008 at the future of flight everett, wa. The crashworthiness of a material is expressed in terms of its specific energy absorption. Modeling of cylindrical and pouch cells for crash energy.
Modeling of cylindrical and pouch cells for crash energy absorption and electric short circuit. Investigate which leading materials candidates fibers, matrixresin, architecture can be the most viable for crashworthiness that lead to increased strength, stiffness, energy absorption while reducing component structural mass by at least 50%. Pdf advanced composite sandwich structure design for. Crashworthiness energy absorption of carbon fiber composites. Crashworthiness, energy absorption, composite materials, crushing. According to the proposed strategy, a novel fractal thinwalled triangle column fttc is. In europe, the european standard en 15227 defines crashworthiness requirements for rail vehicle bodies 3 including requirements for energy absorption during crash events.
The crashworthiness characteristics of the composite tubes were evaluated by measuring the average and peak crushing load, specific energy absorption, total absorbed energy and crush force efficiency in quasistatic axial compression. Composites crashworthiness energy absorption or the long and winding road toward standardization prof. Pdf the higher mechanical characteristics and mass specific energy absorption capabilities of composite materials motivate their use in large. On design optimization for structural crashworthiness and its. Pdf improved vehicle crashworthiness design by control. Traditionally, in the particular case of aircrafts, the energyabsorption devices are steel or aluminum structural elements. Crashworthiness response of honeycomb metallicgfrp energy. Specimens are characterized according to different crashworthiness metrics, including their energy absorption value, peak force undergone during its collapse and the mass of the components. Development of a polyurethane material to meet the design requirements is also outlined. The energy absorption capability of the aluminum alloy fuselage was better than the fuselages of all composite materials. On the crashworthiness performance of thinwalled energy absorbers. Stringent automotive safety standards have driven engineers to enhance the energy absorption capacity without compromising on the overall vehicle.
The crashworthiness of a material is expressed in terms of its specific energy absorption, es, and interlaminar fracture toughness, gic, which are characteristic to that particular material. Specific energy absorption is defined as the energy absorbed by the tube divided by the mass of the tube. Pdf development of compact shock energy absorber to. Energy absorption of aircraft structures as an aspect of crashworthiness. Crashworthiness response of honeycomb metallicgfrp energy absorption devices l. Numerical simulation has become a common tool in structural design and crashworthiness. Improved vehicle crashworthiness design by control of the energy absorption for different collision situations. Energy absorption in polymer composite materials for. On design optimization for structural crashworthiness and. In this paper, a multiobjective optimization for optimal composite hatshape energy absorption system is presented at the first, the behaviors of the hat shape under impact, as simplified model of side member of a vehicle body, are studied by the finite element. Ridhanumerical modelling of steel tubes under oblique crushing forces a. The effect of geometrical parameters on the energy absorption characteristics of thinwalled structures under axial impact loading. However, the complexity of these events is such that often these processes need to be. Pdf download for energy absorption in polymer composites for automotive.
The fe model, without sea, was validated to a previously performed fullscale locomotive crashworthiness test. From the point of view of energy absorption capacity and available stroke length, it has been found that circular tubes under axial compression to provide one. The specific energy absorption strongly depends on the mode the structure fails. Crashworthiness and impact energy absorption study. Aluminum alloy thinwalled structures have been well used in applications of energy absorption. Improved vehicle crashworthiness design by control of the energy absorption for different collision situations citation for published version apa. The effect of geometrical parameters on the energy absorption. The test results demonstrate that vehicle crashworthiness can be improved by using energy absorbing polyurethane foam to modify a vehicles crash signature. No credit for energy absorption no credit for survivable volume outdated test dummy specified no modern simulation tool credit what is the goal of this requirement.
Crashworthiness evaluation of an energy absorption experimental troop seat concept technical report avser 6411 by langston w. A new crush trigger, called crown trigger, is introduced at one end of carbonfibrereinforced polymer circular tubes. Crash safe energy storage systems for electric vehicles, golden, co, nov, 12, 2012. Keywords composites, crashworthiness, light aircraft, impact, energy absorption, finite element method. The largest amounts of energy absorption are made up of the intralaminar energy 49. Energy absorption analysis of various vehicles under crash test simulation thanapon chotika1, janwelm biermann2 and saiprasit koetniyom3 1,3 department of automotive engineering, faculty of engineering, the sirindhorn international thaigerman graduate school of. Advisory group for aerospace research and development. The energy absorption capability of a composite material is critical to developing. Pdf improved vehicle crashworthiness design by control of. Specific energy absorption an overview sciencedirect topics.
Thinwalled structures are most widely used for crashworthiness and energy absorption applications, due to their light weight and high energy absorption efficiency 3. The energy absorption capacity during a crash will directly influence the damage level for passengers. The simulation results with a number of shock absorbers used as crash energy management cem system show no locomotive override up to 30 mph collision speed. The energy absorption is a critical factor to estimate a safety level of passenger, therefore, the crash performance of three public femodels of ford taurus.
In passenger vehicles the ability to absorb impact energy. Pdf crashworthiness energy absorption of carbon fiber. Sea which is characteristic to that particular mate rial. The crash energy absorption of the vehicles front structures. Topology optimization of energy absorbers under crashworthiness using modified hybrid cellular automata mhca algorithm springerlink. Impact energy absorption of concentric circular tubes. Metal foams for improved crash energy absorption in passenger.
Weinberg prepared by aviation safety engineering and research 2641 e. The first is defined as the ability of a structure to protect its occupants during an impact event and is determined by tests involving controlled failure mechanisms and the maintenance of a gradual degradation in the load profile. Optical characterization of composite layers prepared by plasma polymerization. Multiobjective crashworthiness optimization of composite. Crashworthiness parameters and energy absorption capability of composite materials hakim s. Crashworthiness is defined as the ability of materials to absorb impact energy by means of controlled failure mechanisms and modes. Quasistatic compression tests are performed on the tubes to investigate their energy absorption characteristics. Keywords crashworthiness, energy absorption, composite materials, crushing. Structural mechanics group, school of civil engineering, universidade da coru. Pdf energy absorption in polymer composites for automotive. The first is defined as the ability of a structure to protect its occupants during an impact event and is determined. The test results demonstrate that vehicle crashworthiness can be improved by using energyabsorbing polyurethane foam to modify a vehicles crash signature.
Reducing force is one of crashworthiness demanded keep the passengers safer by reducing the transferee force to them. Experiment and simulation article pdf available january 2011 with 1,258 reads how we measure reads. Specific energy absorption is defined as the energy absorbed per unit mass of material. Energy absorption characteristics of concentric circular tubes are quantified in terms of specific energy absorption sea and crush force efficiency cfe. Topology optimization of energy absorbers under crashworthiness using modified hybrid cellular automata mhca algorithm. Crashworthiness is the ability of a structure to protect its occupants during an impact. This paper describes an experimental investigation on the response of composite sandwich structures with tubular inserts to quasistatic compression. Theoretical calculation of energy absorption can be calculated using impact theory 24. The crashworthiness is also known as the capability of the structure to be progressively crushed, thus minimising or dissipating the external forceimpact of energy. Buckeye road phoenix, arizona a division of flight safety foundation, inc. Energy absorption in polymer composites for automotive. On the other hand, due to the different structural design in the airframes of rotorcrafts, small airplanes, and large airplanes, the mechanisms of crashworthiness and energy absorption are different. Composite materials can be characterized in terms of energy absorption by its crashworthiness and penetration resistance.
Pdf advanced composite sandwich structure design for energy. Energy absorbing structures, crashworthiness, impact loading, foamfilled, functionally graded thickness, multicell, crashworthiness design. Multidisciplinary design study of heavy vechical rupd. Traditionally, in the particular case of aircrafts, the energy absorption devices are steel or aluminum structural elements. Energyabsorbing polyurethane foam to improve vehicle. Moreover, each initial design is subjected to optimization techniques to achieve the utmost from the aforementioned metrics. Crashworthiness of fuselage hybrid structure 8iarcsfc 2016 k. An additional benefit of using this method is the quick and stable convergence while the energy absorption relative to the mass fraction is remarkably improved. Metal foams for improved crash energy absorption in passenger equipment idea program final report for the period march 2002 through june 2004 hsr34 prepared for the idea program transportation research board national research council kenneth kremer fraunhofer usa delaware center for manufacturing and advanced materials 9 innovation way. Impact and crashworthiness lab icl the energy absorption capabilities of prismatic and curved members. Energy absorption in polymer composites for automotive crashworthiness. Development of compact shock energy absorber to improve. Energy absorption in polymer composites for automotive crashworthiness article pdf available in journal of composite materials 367. Improved vehicle crashworthiness design by control of the.
Materials free fulltext crashworthiness optimization. Crashworthiness building block approach page 8 test pyramid analysis pyramid truncated full material failure models elementary failure key level to build confidence in analysis sequence of crash events energy absorption deformation and failure mode eighth triennial international aircraft fire and cabin safety research conference october 2427, 2016. Energyabsorbing mechanisms and crashworthiness design of. Crashworthiness response of honeycomb metallicgfrp. Energy absorption analysis of various vehicles under crash test simulation. Energy absorption and strength evaluation for compressed. Mar 15, 2019 an additional benefit of using this method is the quick and stable convergence while the energy absorption relative to the mass fraction is remarkably improved. Aa332 aircraft structures ii composites crashworthiness. Jun 16, 2018 the crashworthiness characteristics of the composite tubes were evaluated by measuring the average and peak crushing load, specific energy absorption, total absorbed energy and crush force efficiency in quasistatic axial compression. Standardization of numerical and experimental methods for. Energy absorption capability and crashworthiness of composite. Crashworthiness analysis and design optimization of hybrid. In every crashworthiness structural study, the cle value that is close to the unity value will display better performance in the energy absorbing structure, making it more qualified in the application of energy absorption tubes.
287 1263 1026 1020 214 1061 810 125 1423 973 829 10 249 844 1073 1355 676 1050 381 1045 413 1493 178 590 739 1494 480 1084 1454 710 3 43 1188 94 768 530 226 611 952 811