Shock, impact and explosion is devoted to research and. Modelling of structures under seismic, impact, and shock vibrations article pdf available in shock and vibration 2018 september 2018 with 171 reads how we measure reads. By integrating the dynamic response analysis to an analytical procedure for predicting the resultant. In contrast, an impact crater is the surface expression of an impact structure. This analysis is a firstply failure model derived using a maximum stress failure criterion. Shock enhancement of cellular structures under impact loading. They are able to operate in very arduous conditions under a wide range of temperatures.
The dynamics of shock, impact and explosions are an important consideration in the design of structures. Foundation shock and vibration isolation systems for. Journal of microelectromechanical systems 1 gallium nitride. Today, the impact resistance of engineering structures subjected to blast and impact is of great interest to engineering communities and government agencies against possible terrorist threats. Anagnostopoulos 6 simulated the usage of a soft material that acted as a shock absorber by simply considering a decreased impact stiffness value for the linear viscoelastic impact model that was used for the simulation of poundings of buildings in series. The aim was the study of the conservatism of empirical perforation formulae when used with soft missiles. The special issue is to address the state of knowledge in the areas of modelling materials and structural behavior under dynamic loading, including blast shock induced vibration, impact loading, and seismic actions, within the context of structural analysis and design verification essential for protecting structures against seismic, blast, and impact loadings. Panels with specific type of 2zcrimp and v crimp predominate. In the explosion, the peak pressure produced by shock wave is much greater than the static collapse pressure of the structures. However the scope of work of this paper is restricted to metal spring shock absorber type only. Modelling of structures under seismic, impact, and shock. Afterwards, a number of authors also reported this effect for various cellular materials at high impact.
Experimental investigation of converging shocks in water with. Influence of shockwave deformation on the structureproperty. The impact produces a shock wave in water that develops even higher pressure when focused in the vicinity of the apex. Large impact loads may be caused by accidentally dropping heavy objects into the cargo holds of ships and onto the decks of offshore platforms, for example. Shock enhancement of cellular structures under impact. The earlier meetings were held in cambridge, massachusetts, usa in 1989, portsmouth, uk in 1992, madrid, spain in 1994, udine, italy in 1996, thessaloniki, greece in 1998, cambridge, u. Science foundation under award 1002036 and award 1055308.
Static versus dynamic structural response of bridge piers to barge collision loads by long hoang bui december 2005 chair. This book presents a didactic approach starting with the theoretical elements of the mechanics of materials and structures, in order to develop their applications in the cases of shocks and impacts. Pdf materials and structures under shock and impact. I n the early 1960s nasa tackled one of its greatest challenges. Projet anr vulcain 1 advanced simulation of damage of reinforced concrete structures under impact s. This paper aims at showing experimental proof of the existence of a shock front in cellular structures under impact loading, especially at low critical impact velocities around 50 m s. Shock absorbers save structures and lives during earthquakes. Comparison with the test results shows that the proposed model. In explosions, shock waves come from the high energy released due to the burning processes of high explosives or from the explosion of. Modelling of impact behavior of concrete subjected to. The influence of load interaction on the fatigue crack growth rate depends on the interaction of the produced plastic zones. Figure 3 global s33 stress contours n mm2 on deforming central portion of plate for indicated times after impact structures under shock and impact 69. Shock factor investigation in a 3d finite element model. The general shape of a pulse shape is shown in figure 2.
In order to study shock tube performance, an appropriate set of instruments is applied to the tube. The characteristics of reinforced concrete beams under impact loading are shown. Shock spectrum calculation of structural response to undex wang yu 1 fan jianglin2 zhiyi zhang 2 shen rongying 2 hua hongxing2 1naval research center, 73 beijing, box314 2state key laboratory of mechanical system and vibration, shanghai jiao tong university 200030 shanghai email. A set of three icp integrated circuit piezoelectric dynamic pressure transducers is positioned along the. Structural collapse analysis of framed structures under impact loads using asigauss finite element method kyaw myo lynn1 and daigoro isobe2 1graduate school, university of tsukuba, 111. Classification of the distinguished cycles counting procedure will, thus, form the load spectrum to be used in crack growth analysis. In this paper, a scaled 3d ship under shock loading is modeled and analyzed by.
Vibration and shock isolation the principles involved in both vibration and shock isolation are similar. In risk studies, engineers often have to consider the consequences of an accident leading to a shock on a construction. For this purpose we are to cut shock absorber on the lathe machine and then make the model on the proecad showing dimension of each component. Introduction the concept of shock enhancement effect under high speed impact 100 m s was originally proposed by reid and peng 1997 to explain testing results on woods. Part i experiments ibrahim elnasri, stephane pattofatto, elli tsitsiris, han zhao, francois hild, yannick girard to cite this version. Materials and structures under shock and impact wiley online books. A mechanical shock is a sudden acceleration or deceleration. Simulation of the reinforced concrete slabs under impact loading.
For this we have to take the dimension of each part of existing shock absorber. The term shock is used to describe matter that is subjected to force with respect to time. The ultimate strength this type of plastic is approximately 10,000 psi so it appears the case will break if dropped from 5 feet. Performance of a shock tube facility for impact response of. An introduction to shock, impact, and the action of viscoelastic materials shock is a stimulus applied to a system. The physical embodiment of that effort, the apollo spacecraft, stood as a testament to human ingenuity.
Structural impact is concerned with the behaviour of structures and components subjected to large dynamic loads which produce inelastic deformation. Shock spectrum calculation of structural response to undex wang yu 1 fan jianglin2 zhiyi zhang 2 shen rongying 2 hua hongxing2 1naval research center, 73 beijing, box314. After all, explosives have been used for several hundred years, and high explosives have been used extensively for about one hundred and fifty years. Important factors pertinent to burst pressures include the. This field is of particular interest for the crash. This can concern the impact of a ground vehicle or aircraft, or the effects of an explosion on an industrial site. The current search for new impact structures now emphasizes the recognition.
He developed differently designed slabs under impact loads and validated the results experimentally. Further, it is suggested to an use of evaluation method predicting the maximum beam. Terms written in italics are in general explained in the impact structure and meteorite crater glossary. The air behind the shock front also places a load, a drag force, on objects encountered 11. Interpretation of the results of shock wave effects on materials must therefore address all of the details of the shock induced deformation substructure in light of the operative metallurgical strengthening mechanisms in the material under investigation, and the experimental conditions under which the material was deformed and recovered. It provides another experimental proof of the existence of a shock front at this low impact speed 56 ms and enables for a quantitative evaluation of the shock front velocity. A schematic layout of the shock tube device in the assembled configuration ready to test a specimen is shown in fig.
Three point bending test of aluminum tubular structure with hat crosssection was carried out under impact condition. Structures under shock and impact ii ice virtual library. Research paper analysis of shock absorber using different. Classification of the distinguished cycles counting. Conference on structures under shock and impact held in crete, greece, march 2004. Performance of a shock tube facility for impact response. Army research laboratory, adelphi, md, usa, through the micro autonomous systems and technology collaborative technology alliance under contract w911nf. Pdf shock enhancement of cellular structures under impact. Interpretation of the results of shockwave effects on materials must therefore address all of the details of the shockinduced deformation substructure in light of the operative metallurgical strengthening. Pdf on sep 6, 2018, abdul qadir bhatti and others published modelling of structures under seismic, impact, and shock vibrations find.
Structures under shock and impact 427 where e% is the longitudinal modulus of the undamaged laminate, cand fcare mechanical load and thermal stress constants for ply group 1. A common case of impactvehicle collision with a traffic barrierinvolves large displacements, material nonlinearity, elastic and plastic instability, postbuckling strength, coulomb friction and material behavior under. Advanced simulation of damage of reinforced concrete. Impact2014 impact and structural mechanics analysis of soft. Four chambers, movable on a linear guide system, are shown in fig. The initial work of dickey and fuller 1979 has led to considerations of the theoretical and empirical effects of. Anagnostopoulos 6 simulated the usage of a soft material that acted as a shock absorber by simply considering a decreased impact stiffness value for the linear. Modeling of impact load characteristics for dynamic. Influence of shockwave deformation on the structure.
The detonation of a condensed high explosive generates hot gases under. This book provides a detailed and illustrated study of structural dynamics of. An impact structure is a generally circular or craterlike geologic structure of deformed bedrock or sediment produced by impact on a planetary surface, whatever the stage of erosion of the structure. Experimental investigation of converging shocks in water.
Part ii analysis article pdf available in journal of the mechanics and physics of solids 5512 december 2007 with 89 reads. Bending collapse behavior of tubular structure under impact. Shock absorbing structures no matter the type, a folded core has good impact resistance considering both force and energy criteria. The special issue is to address the state of knowledge in the areas of modelling materials and structural behavior under dynamic loading, including blastshock. Proceedings of the second international conference, held in. Impact mechanics and highenergy absorbing materials. This field is of particular interest for the crashworthiness design of aircraft, buses, cars, trains, ships and marine structures, and the energy absorbing characteristics of various components. In many cases, on earth, the impact crater has been destroyed by. The current search for new impact structures now emphasizes the recognition, among the new discoveries, of individual structures that can provide specific information about. Performance based design of reinforced concrete beams.
Departmentofcivil engineering, universityof ottawa,canada. The hot gas expands forcing out the volume it occupies. Pdf modelling of structures under seismic, impact, and shock. Shock isolation introduction the purpose of shock isolation is to limit the forces transmitted to the surroundings of the equipment in which shock originates. Recent studies on the response of structues subjected to. The general problem of impact is extremely complex. The structures which were strengthened with carbon fiber reinforced thermoplastic. Resistance of structures to explosion effects erncip. For solid materials with higher wave speeds than the shock in water. Latin american journal of solids and structures 1020 941 952.
Reasons for isolating the effects of shock shock is created by impact of one mass against another e. In shock loading, an impacttype force is applied over a short instant of time. Pdf impact loading analysis have wide applications in civil engineering including crash barrier design, impact resistance structural design against. Impact2014 impact and structural mechanics analysis of soft and hard impacts smash ilkka hakola, arja saarenheimo, ari vepsa, kim calonius, simo hostikka, juha kuutti, ari silde, topi sikanen 1 and markku tuomala 2 1 vtt technical research centre of finland. A nonlinear impact model for simulating the use of rubber. Blast loading and blast effects on structures an overview. At one time or another most engineers run into cases of impact loading. This issue will benefit structural engineers for modelling structural analysis and design for extreme loads seismic, blast, and impact, in which the. The last part of the book deals with many detailed case studies on structures of numerous materials like steel, composites, and concrete structures. The special issue is to address the state of knowledge in the areas of modelling materials and structural behavior under dynamic loading, including blastshock induced vibration, impact loading, and seismic. This book provides a detailed and illustrated study of structural dynamics of almost all types of shocks, impacts and explosions. Upon collision of a large cosmic projectile asteroid, comet with the earths surface shock waves propagating into the impactor and into the underground belong to the most important processes in this geologically prominent event.
Shock spectra generated by impacts against tank armor have been reported by. Structural collapse analysis of framed structures under impact. Nov 23, 2012 the dynamics of shock, impact and explosions are an important consideration in the design of structures. Pdfs are planar shock deformations in minerals especially quartz in the form of closely spaced isotropic lamellae following crystallographic planes fig. Pdf modelling of structures under seismic, impact, and.
A common case of impactvehicle collision with a traffic barrierinvolves large. Consider a beam having a symmetrical cs subjected to an increasing bm. An introduction to shock, impact, and the action of. Structures under shock and impact how is structures under. A drop, strike, kick, earthquake or explosions are examples of shock.
Shock metamorphism page ernstson claudin impact structures. Shock can be defined as a transient condition where a single impulse of energy produced by a force is transferred to a system in a short period of time and with large acceleration. Modelling of structures under seismic, impact, and shock vibrations. The detonation of a condensed high explosive generates hot gases under pressure up to 300 kilo bar and a temperature of about 30004000c.