Recent Studies on the Dynamic Plastic Behavior of Structures - An Update

1996 ◽  
Vol 49 (10S) ◽  
pp. S112-S117 ◽  
Author(s):  
Norman Jones
Keyword(s):  
Air Transportation ◽  
Transportation Systems ◽  
Dynamic Loads ◽  
Plastic Behavior ◽  
Structural Members ◽  
Applied Mechanics ◽  
Review Of The Literature ◽  
Plastic Response ◽  
Energy Absorbing ◽  
Inelastic Strains

This article contains a brief review of the literature, published since the previous Applied Mechanics Reviews article in 1989 [1], on the dynamic plastic response of basic structural members made from ductile metallic type materials. The external dynamic loads cause large inelastic strains in the structural members which dominate material elastic effects. Thus, the external dynamic energy is absorbed plastically and, generally speaking, produces large permanent deformations. This field of research is of interest for the structural crashworthiness and collision protection of land, sea and air transportation systems, as well as the design of energy absorbing systems, and provides vital input into safety calculations and hazard assessments throughout industry.

Recent Studies on the Dynamic Plastic Behavior of Structures

1989 ◽  
Vol 42 (4) ◽  
pp. 95-115 ◽  
Author(s):  
Norman Jones
Keyword(s):  
Brittle Fracture ◽  
Dynamic Loads ◽  
Large Impact ◽  
Plastic Behavior ◽  
Impact Loads ◽  
Plastic Strains ◽  
Review Of The Literature ◽  
Rigid Plastic ◽  
Plastic Buckling ◽  
Fracture Transition

This article contains a review of the literature, which has been published recently, on the dynamic plastic behavior of simple structures. The dynamic loads cause large plastic strains which dominate material elastic effects. Thus, the accuracy of various refinements of simple rigid-plastic methods are discussed, together with the phenomena of pseudoshakedown under repeated loads, dynamic plastic buckling, and dynamic progressive buckling. Recent studies are also reported on similitude under large impact loads, and on the ductile-brittle fracture transition due to the changes in the physical dimensions of a structure.

The Influence of Rotatory Inertia and Transverse Shear on the Dynamic Plastic Behavior of Beams

1979 ◽  
Vol 46 (2) ◽  
pp. 303-310 ◽  
Author(s):  
Norman Jones ◽  
J. Gomes de Oliveira
Keyword(s):  
Transverse Shear ◽  
Shear Force ◽  
Yield Criterion ◽  
Yield Condition ◽  
Bending Moment ◽  
Plastic Behavior ◽  
Plastic Response ◽  
Rotatory Inertia ◽  
Perfectly Plastic ◽  
Theoretical Procedure

The theoretical procedure presented herein examines the influence of retaining the transverse shear force in the yield criterion and rotatory inertia on the dynamic plastic response of beams. Exact theoretical rigid perfectly plastic solutions are presented for a long beam impacted by a mass and a simply supported beam loaded impulsively. It transpires that rotatory inertia might play a small, but not negligible, role on the response of these beams. The results in the various figures indicate that the greatest departure from an analysis which neglects rotatory inertia but retains the influence of the bending moment and transverse shear force in the yield condition is approximately 11 percent for the particular range of parameters considered.

Dynamic Plastic Response of Cylindrical Shells Under Gaussian Impulse

1980 ◽  
Vol 24 (01) ◽  
pp. 24-30
Author(s):  
S. Anantha Ramu ◽  
K. J. Iyengar
Keyword(s):  
Cylindrical Shells ◽  
Yield Condition ◽  
Longitudinal Axis ◽  
Plastic Behavior ◽  
Plastic Response ◽  
Marine Structures ◽  
Impulsive Load ◽  
Tresca Yield Condition ◽  
Impulsive Loads

The determination of the inelastic response of cylindrical shells under general impulsive loads is of relevance to marine structures such as submarines, in analyzing their slamming damages. The present study is concerned with the plastic response of a simply supported cylindrical shell under a general axisymmetric impulsive load. The impulsive load is assumed to impart an axisymmetric velocity to the shell, with a Gaussian distribution along the longitudinal axis of the shell. A simplified Tresca yield condition is used. The shell response is determined for various forms of impulses ranging from a concentrated impulse to a uniform impulse over the entire length of the shell. Conclusions about the influence of geometry of the shell and the spatial distribution of impulse on the plastic behavior of cylindrical shells are presented.

Influence of Spatial Variability of Seismic Shock on Steel Hall with Experimentally Determined Elasto-Plastic Parameters of Steel Material

2015 ◽  
Vol 744-746 ◽  
pp. 884-889
Author(s):  
Dorota Jasinska ◽  
Joanna M. Dulinska ◽  
Pawel Boron
Keyword(s):  
Spatial Variability ◽  
Seismic Excitation ◽  
Plastic Behavior ◽  
Structural Members ◽  
Steel Material ◽  
Dynamic Analyses ◽  
Seismic Shock ◽  
Wave Passage ◽  
Delay Dependent ◽  
Excitation Model

In the paper the influence of spatial variability of a seismic shock on an industrial steel hall was examined. Different models of seismic excitation were introduced. Firstly, a uniform seismic excitation model was applied, assuming identical motion of all supports of the hall. Then, a non-uniform excitation model was implemented. In that model subsequent points of the ground in the direction of wave propagation repeat the same motion with a certain time delay dependent on the wave velocity. Two direction of the wave passage were assumed: longitudinal (along the longer side of the hall) and transverse (along the shorter side of the hall). To guarantee proper nonlinear elasto-plastic behavior of the structure, the material parameters of the steel were determined experimentally. The dynamic analyses revealed that the response of the hall to the seismic shock was reported beyond the elastic range. Plastic effects appeared in some zones of the primary as well as the secondary structural members of the object, regardless of the excitation model. The model of non-uniform seismic excitation with transverse wave passage turned out to have the greatest impact on the dynamic response of the hall; the plastic strains obtained for that model were much greater than those obtained for other models. The transverse non-uniform excitation generated irreversible strains almost 3 times greater than the uniform excitation. The evolution of significant plastic effects was observed mainly for non-uniform excitations in the lower parts (girts and columns) of the hall, which were strongly affected by the different motions of the ground.

Analysis and Comparison of Safety of Children and Adult Passenger in Car Based on Crash Tests Results

2013 ◽  
Vol 597 ◽  
pp. 199-205
Author(s):  
Bartosz Zdunek ◽  
Michał Landowski ◽  
Stanislaw Taryma ◽  
Ryszard Woźniak ◽  
Krystyna Imielińska ◽  
...  
Keyword(s):  
Dynamic Test ◽  
Occipital Bone ◽  
The Other ◽  
Dynamic Loads ◽  
Impact System ◽  
Dynamic Forces ◽  
Good Energy ◽  
Energy Absorbing ◽  
Crash Tests

Most important features of the child seat were presented. There was made analysis of selected dynamic loads acting on mannequins heads during a collision. Comparison of loads acting on the kid in a child seat and the other passengers in a car is presented. In analysis of the results particular attention has been paid on the children's secure in a car. The phenomena of collision child's occipital bone with seat backrest was described. There were presented results of dynamic test of chosen kind of materials, which were expected for having good energy absorbing characteristic. Selected courses of dynamic forces, values of peak forces and time of dynamic forces acting for tested materials were shown. The tests were made on dynamic droptower impact system Instron CEAST 9310.

scholarly journals MULTI-AIRPORT SYSTEMS AS A GLOBAL TOURISM PHENOMENON: A CRITICAL REVIEW AND A NEW CONCEPT

2019 ◽  
Vol 6 (1) ◽  
pp. 01-11
Author(s):  
Dr. Farouk Abdelnabi Hassanein Attaalla
Keyword(s):  
Critical Review ◽  
Air Transportation ◽  
Transportation Systems ◽  
Primary Data ◽  
Basic Tool ◽  
International Experiences ◽  
Global Tourism ◽  
Different Dimensions ◽  
Air Transportation Systems ◽  
Shed Light

Purpose:The main objective of the present study is to shed light on the different dimensions and international experiences of the multi-airport system including the Egyptian experience in this regard. Methodology:The methodology of the study depends on the researcher's own critical review based on his scientific background on the phenomenon of multi-airport systems through survey in secondary and primary data. Findings:Finally, the study presented a new comprehensive concept of the multi-airport system. The importance and originality of the current research is to ameliorate the concept of multiple-airport system in light of displaying some of international experiences. Implications:The transition from single-airport to multi-airport systems is going to be a basic tool by which air transportation systems will be able to meet future demand. There are many experiences related to the failure and success of managing the multi-airport systems worldwide.

Sign in / Sign up

Export Citation Format

Share Document