Dynamic Response of the Single-Layer Kiewitt-8 Reticulated Dome Subjected to the Airplane Crash

2015 ◽  
Author(s):  
Li Lin ◽  
Yunhui Sun ◽  
Xudong Zhi ◽  
Hongfeng Yin
Keyword(s):  
Dynamic Response ◽  
Single Layer ◽  
Airplane Crash

Effect of Multimaterial Layering on the Response of a Generic Hull Structure

1997 ◽  
Author(s):  
Aaron D. Gupta ◽  
Christopher Meyer
Keyword(s):  
Dynamic Response ◽  
Support System ◽  
Comparative Evaluation ◽  
Single Layer ◽  
Circular Opening ◽  
Vibrational Response ◽  
Multilayered Composite ◽  
Modal Response ◽  
Hull Structure ◽  
Composite Armor

Abstract The dynamic response of a basic, generic, multilayered, composite vehicle hull with a large, circular opening for the turret assembly has been compared with that of an equivalent single-layer, basic metallic hull with identical geometry to assess the influence of a multilayered, composite armor panel structure on the modal response. Both models, without the engine block, mountings, transmission, and base support system consisting of tracks, wheels, sprockets, torsion bars, etc., were generated using PATRAN 3 to facilitate computational modal analysis and comparative evaluation of the influence of multilayered construction on the free vibrational response.

Dynamic Stress Analysis of Multilayered Structure With Radial Gaps of Cylindrical Pressure Vessel Under Plane Strain Conditions

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Huadong Liu ◽  
Weiqiang Wang
Keyword(s):  
Plastic Deformation ◽  
Dynamic Response ◽  
Plane Strain ◽  
Pressure Vessel ◽  
Single Layer ◽  
Multilayered Structure ◽  
Multilayered Structures ◽  
Loading Process ◽  
Cylindrical Pressure Vessel ◽  
Gap Height

Radial gaps were found in multilayered cylindrical vessels which experience inner explosion accidents in chemical plants in the past few years worldwide. It is necessary to investigate the dynamic response of multilayered structures with radial gaps to ensure the vessel safety. This paper presented a numerical modeling of the dynamic response of a multilayered structure with radial gaps of cylindrical pressure vessel under plane strain conditions by using the ANSYS/ls-dyna package. The effects of the dynamic loading profile and the radial gap height are considered in the investigation. The stress spatial distribution, the stress and the plastic deformation variation curves with time are emphatically analyzed. The results show that the stress variation of the entire loading process can be divided into four stages: the oscillation stage, the yield stage, the fast increase stage, and the redistribution stage. The layer stress distributes discontinuously at the gaps between layers and distributes unevenly in any single layer. The inner layer stress is not always larger than the outer layers' during the whole loading process. The effect of loading profile on the dynamic response is not as obvious as the gap height. As the gap height increases, the stress oscillation stage is suppressed and becomes shorter. While the loading recovers to the operation pressure, the stress and the plastic deformation of inner layers increases and vice versa for the outer layers.

Finite Element Analysis of a Single-Layer Reticulated Dome under Impact Loading

2010 ◽  
Vol 163-167 ◽  
pp. 327-331 ◽  
Author(s):  
Liang Zheng ◽  
Zhi Hua Chen
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Impact Force ◽  
Impact Load ◽  
Residual Deformation ◽  
Time History ◽  
Single Layer ◽  
Element Analysis ◽  
Deformation Stage ◽  
The Impact

Finite element model of both the single-layer Schwedler reticulated dome with the span of 50m and a Cuboid impactor were developed, incorporating ANSYS/LS-DYNA. PLASTIC_KINEMATIC (MAT_003) material model which takes stain rate into account was used to simulate steel under impact load. The automatic point to surface contact (NODES TO SURFACE) was applied between the dome and impact block. Three stages of time history curve of the impact force on the apex of the single-layer Scheduler reticulated dome including the impact stage, stable stalemate stage, the decaying stage were generalized according to its dynamic response. It must be pointed out that the peak of the impact force of the single-layer reticulated dome increase with the increase of the weight and the velocity of the impact block, but the change of the velocity of the impact block is more sensitive than the change of weight of the impact block for the effect of the peak of the impact force, and a platform value of the impact force of the single-layer reticulated dome change near a certain value, and the duration time of the impact gradually increase. Then four stages of time history curve of the impact displacement were proposed according to the dynamic response of impact on the apex of the single-layer reticulated dome based on numerical analysis. Four stages include in elastic deformation stage, plastic deformation stage, elastic rebound stage, free vibration stage in the position of the residual deformation.

Dynamic Response of Reticulated Domes under the Impact

2014 ◽  
Vol 638-640 ◽  
pp. 58-61
Author(s):  
Chang Wu ◽  
Xiu Li Wang ◽  
Ya Xiong Liang ◽  
Zhan Zhong Yin
Keyword(s):  
Dynamic Response ◽  
Failure Modes ◽  
Numerical Models ◽  
Single Layer ◽  
Response Mode ◽  
Object Size ◽  
Response Modes ◽  
Reticulated Domes ◽  
Parametric Analyses ◽  
The Impact

As the study of the dynamic response of single-layer reticulated domes under impact, Numerical models for single-layer Kiewitt-6 reticulated domes with sub steel cube column were established by the ANSYS/ LS-DYNA program and a dynamic analysis were carried out. Four failure modes for the reticulated domes were put forward according as the dynamic response and plastic deformation. The parametric analyses on the dynamic response of single-layer reticulated domes with sub steel cube column under the impact loading are carried out, by changing the impact velocity, mass of impact object, size of impact object and impact location.The effects of these parameters on the response mode of the structures are investigated, and the distribution regularity of the response modes of the structures with different parameters is explained.

Structure Transient Response Analysis of Coal Mine Life-Saving Capsule under Blast Shock Condition

2013 ◽  
Vol 694-697 ◽  
pp. 120-127 ◽  
Author(s):  
Xiao Hui Mao
Keyword(s):  
Dynamic Response ◽  
Transient Response ◽  
Coal Mine ◽  
Single Layer ◽  
General Purpose ◽  
Response Analysis ◽  
Shock Condition ◽  
Flexible Material ◽  
Life Saving ◽  
Transient Response Analysis

Targeting at insufficient data for simulated blast shock of life saving capsule in coal mine which affects its development and design so that structural transient response analysis optimization was performed to analyze strain-stress, shock-produced deformation and spring-back of the new protective crust with compound structure under shock wave. ADINA, a general-purpose FEA program, is chosen to emulate the dynamic response of the protective structure under blasting stress. The analysis results were compared with the dynamic response results of the single-layer protective crust. The result shows that steel defensive structure with aluminum foam buffer behind general steel has a good attenuation characteristic for peak pressure of blast wave. The composite structure with flexible material layer can protect the core of the lifesaving system better from the blast. The simulation experimental environment can be established and reference data can be provided for the design of a life-saving ball system by using numerical analysis methods.

Wind-induced dynamic response and its load estimation for structural frames of single-layer latticed domes with long spans

2002 ◽  
Vol 5 (6) ◽  
pp. 543-562 ◽  
Author(s):  
Yasushi Uematsu ◽  
Takayuki Sone ◽  
Motohiko Yamada ◽  
Takeshi Hongo
Keyword(s):  
Dynamic Response ◽  
Single Layer ◽  
Load Estimation ◽  
Structural Frames
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