Behaviour and failure modes of steel parking structure column under transverse impact

2021 ◽  
Vol 167 ◽  
pp. 108163
Author(s):  
Siyu Xiang ◽  
Yongjun He ◽  
Xuhong Zhou
Keyword(s):  
Failure Modes ◽  
Transverse Impact

scholarly journals CIRCULAR DOUBLE SKIN STAINLESS STEEL TUBULAR COLUMN FILLED WITH UHPFRC SUBJECTED TO IMPACT LOAD

2021 ◽  
pp. 1-11
Author(s):  
KHALID ABDEL NASER ABDEL RAHIM
Keyword(s):  
Smart Materials ◽  
Impact Loading ◽  
Failure Modes ◽  
Impact Load ◽  
Steel Tube ◽  
Fiber Reinforced Concrete ◽  
Lateral Impact ◽  
Transverse Impact ◽  
Residual Displacements ◽  
Double Skin

Concrete filled steel tube (CFST) column is an important type of structural member and its protective design is essential to enhance its structural performance under various dynamic loads. Previously carried out studies on CFST columns tried to determine how to improve their structural response under various loadings, such as axial compression, lateral impact, blast, seismic, etc. Apart from investigations on transverse impact loading, the majority of the other studies on CFST under various loads established solutions and protective measures. Therefore, this study aim is to improve the performance of CFST under transverse impact loads. The geometrical and mechanical properties, boundary conditions, impact loading and dynamic explicit analysis employed in that study. This paper proposes a novel design in terms of cross-sectional configuration and smart materials to be applied on the CFST in order to improve its performance under lateral impact loading. The proposed investigation is exclusively numerical and its results were verified with the experimental results from literature. The considered three main variables were including (1) concrete-filled double skin steel tubular – CFDST with both first sandwich layer and internal carbon steel tube filled with normal strength concrete – NSC, (2) CFDST with first sandwich layer filled with Ultra High-Performance Fiber-Reinforced Concrete – UHPFRC. a. The parameters including failure modes, maximum mid-span deflection, and residual displacements were presented.

Dynamic Response of Aluminum Foam Sandwich Panel to Transverse Impact

2013 ◽  
Vol 535-536 ◽  
pp. 485-488
Author(s):  
Zhi Hua Wang ◽  
Xin Li ◽  
Zhi Qiang Li ◽  
Long Mao Zhao
Keyword(s):  
Dynamic Response ◽  
Aluminum Foam ◽  
Failure Modes ◽  
Shear Failure ◽  
Metal Foam ◽  
Sandwich Panels ◽  
Front Face ◽  
Strain History ◽  
Transverse Impact ◽  
Cell Foam

The dynamic response of aluminum foam sandwich panels are studied experimentally by impacting the panels at mid-span with metal foam projectiles. Two types of core are considered: open-cell foam and closed-cell foam. By changing the launching speed of metal foam projectiles, different deformation/failure modes of sandwich panels are obtained. Strain history of face sheets in different positions is also recorded by strain gauges to observe its deformation mechanism. The experiment results indicated that when the strength of core is relatively small and the impulse exerted is large, erosion failure of front face and shear failure of core occurred.

Experimental Investigation on the Behavior of Hollow GFRP Pipes Subjected to Transverse Impact

2015 ◽  
Vol 1110 ◽  
pp. 36-39
Author(s):  
De Xin Xiong ◽  
Tong Yun Wang ◽  
Jat Yuen Richard Liew
Keyword(s):  
Experimental Investigation ◽  
Failure Modes ◽  
Impact Force ◽  
Structural Performance ◽  
Transverse Impact ◽  
Factors Affecting ◽  
Reinforced Plastic ◽  
Exploration And Production ◽  
Glass Fibre Reinforced Plastic ◽  
Glass Fibre Reinforced

As oil & gas exploration and production is moving increasingly towards offshore and deeper water, and then the demand for lighter and stronger material for deep water structures is growing. Fibre reinforced plastic (FRP) is a potential alternate. However, such application has low tolerance for accidental impact loads. This paper presents an experimental investigation on the behaviour of hollow glass fibre reinforced plastic (GFRP) pipes subjected to transverse impact. Drop weight impact tests were adopted. The GFRP pipe specimens were simply supported at two ends. The variations of strain, deflection and impact force were recorded. Different failure modes were observed and the critical factors affecting the damage of GFRP pipes were discussed. Their structural performance under transverse impact was assessed.

Finite Element Analysis of Transverse Impact on a Woven Textile

2004 ◽  
Author(s):  
Yiping Duan ◽  
Michael Keefe ◽  
Travis A. Bogetti ◽  
Brian Powers
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
High Strength ◽  
Theoretical Work ◽  
Impact Behavior ◽  
Transverse Impact ◽  
Element Analysis ◽  
Distribution Energy ◽  
The Impact ◽  
Woven Textile

High-strength textiles are widely used in soft impact threat shield systems. During the past several decades, a lot of experiments and theoretical work were conducted to understand the transverse impact behavior of textile structures. As a continuation of those efforts, this paper presents finite element modeling of transverse impact of a rigid right circular cylinder into a square patch of plain-woven textile. Two boundary conditions are applied on the woven textile: four edges clamped; two opposite edges clamped and the other two edges left free. Results show that during the initial stage of the impact, there exists an abrupt momentum/energy transfer from the projectile to the local textile in the impact region. The modeling results also show that the textile boundary condition plays an important role in the impact. It significantly affects the textile transient deformation, stress distribution, energy absorption, and failure modes. The textile absorbs energy more quickly when all its four edges are clamped.

Numerical and experimental study on effect of braiding angle on low-velocity transverse punch response of braided composite tube

2019 ◽  
Vol 29 (4) ◽  
pp. 667-686 ◽  
Author(s):  
Yeli Jin ◽  
Zhenyu Wu ◽  
Zhongxiang Pan ◽  
Laihu Peng ◽  
Xudong Hu
Keyword(s):  
Impact Loading ◽  
Failure Modes ◽  
Transverse Impact ◽  
Low Velocity ◽  
Composite Tubes ◽  
Braided Composite ◽  
Composite Tube ◽  
Damage Initiation ◽  
Braiding Angle ◽  
The Impact

In this study, the performance of braided composite tubes under low-velocity transverse impact loading at mid-span was investigated using both numerical and experimental methods. Three types of braided composite tubes with different braiding angles (30°, 45°, and 60°) were manufactured. The transverse punch behavior of the tubes was examined on a low-velocity imspact test bench. A meso-level finite element model of the composite tube was also established for identifying the damage initiation and development. The numerical results showed a good correlation with the experimental data. The mechanical response including force–time histories, force–displacement histories, and fracture morphologies was compared between three types of composite tubes for analyzing the influence of braiding angle on the impact response and failure mode. Although suffering from the low bending stiffness depends on fiber volume fraction at initial impact stage, the braided tube with 30° angle engaged more portion to resist impact loading in subsequent process and thus presented higher peak loading than the one with large angle. In addition, there are distinct different failure modes between composite tubes with various braiding angles. Shear yarn breakage underneath the punch was prone to occur in 30° sample because the braiding yarn was closer to the axial direction of tube. In contrast, the resin was deboned severely from the braiding yarn and then the braiding yarn exhibits plastic deformation in 60° sample due to the stress concentration caused by the large braiding angle.

Scanning Electron Microscopy in Hybrid Microelectronics

1976 ◽  
Vol 34 ◽  
pp. 456-457
Author(s):  
S. Khadpe ◽  
R. Faryniak
Keyword(s):  
Integrated Circuits ◽  
Thick Film ◽  
Integrated Circuit ◽  
Failure Modes ◽  
Three Dimensional ◽  
Circuit Components ◽  
Hybrid Microcircuit ◽  
Electrical Connections ◽  
Scanning Electron

The Scanning Electron Microscope (SEM) is an important tool in Thick Film Hybrid Microcircuits Manufacturing because of its large depth of focus and three dimensional capability. This paper discusses some of the important areas in which the SEM is used to monitor process control and component failure modes during the various stages of manufacture of a typical hybrid microcircuit.Figure 1 shows a thick film hybrid microcircuit used in a Motorola Paging Receiver. The circuit consists of thick film resistors and conductors screened and fired on a ceramic (aluminum oxide) substrate. Two integrated circuit dice are bonded to the conductors by means of conductive epoxy and electrical connections from each integrated circuit to the substrate are made by ultrasonically bonding 1 mil aluminum wires from the die pads to appropriate conductor pads on the substrate. In addition to the integrated circuits and the resistors, the circuit includes seven chip capacitors soldered onto the substrate. Some of the important considerations involved in the selection and reliability aspects of the hybrid circuit components are: (a) the quality of the substrate; (b) the surface structure of the thick film conductors; (c) the metallization characteristics of the integrated circuit; and (d) the quality of the wire bond interconnections.

Human reliability in non-destructive inspections of nuclear power plant components: modeling and analysis

2019 ◽  
Vol 7 (2B) ◽  
Author(s):  
Vanderley Vasconcelos ◽  
Wellington Antonio Soares ◽  
Raissa Oliveira Marques ◽  
Silvério Ferreira Silva Jr ◽  
Amanda Laureano Raso
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Human Factors ◽  
Nuclear Power ◽  
Power Plants ◽  
Failure Modes ◽  
Cooling System ◽  
Human Reliability ◽  
Non Destructive ◽  
Plant Components

Non-destructive inspection (NDI) is one of the key elements in ensuring quality of engineering systems and their safe use. This inspection is a very complex task, during which the inspectors have to rely on their sensory, perceptual, cognitive, and motor skills. It requires high vigilance once it is often carried out on large components, over a long period of time, and in hostile environments and restriction of workplace. A successful NDI requires careful planning, choice of appropriate NDI methods and inspection procedures, as well as qualified and trained inspection personnel. A failure of NDI to detect critical defects in safety-related components of nuclear power plants, for instance, may lead to catastrophic consequences for workers, public and environment. Therefore, ensuring that NDI is reliable and capable of detecting all critical defects is of utmost importance. Despite increased use of automation in NDI, human inspectors, and thus human factors, still play an important role in NDI reliability. Human reliability is the probability of humans conducting specific tasks with satisfactory performance. Many techniques are suitable for modeling and analyzing human reliability in NDI of nuclear power plant components, such as FMEA (Failure Modes and Effects Analysis) and THERP (Technique for Human Error Rate Prediction). An example by using qualitative and quantitative assessesments with these two techniques to improve typical NDI of pipe segments of a core cooling system of a nuclear power plant, through acting on human factors issues, is presented.

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