Assessment of structural damage and failure

2001 ◽  
Vol 71 (1) ◽  
pp. 1-15 ◽  
Author(s):  
W. B. Krätzig ◽  
Y. S. Petryna
Keyword(s):  
Structural Damage ◽  
Damage And Failure

scholarly journals Acoustic emission description from a damage and failure scenario of rotomoulded polyolefin sandwich structure subjected to internal pressure for storage applications

2020 ◽  
Vol 21 (1) ◽  
pp. 105 ◽  
Author(s):  
Eric Lainé ◽  
Jean-Claude Grandidier ◽  
Maxime Cruz ◽  
Anne-Laure Gorge ◽  
Claire Bouvy ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Structural Damage ◽  
Sandwich Structure ◽  
Water Pressure ◽  
Average Frequency ◽  
Polymer Structure ◽  
Foam Core ◽  
Damage And Failure ◽  
Failure Scenario ◽  
Polyethylene Sample

The aim of this paper is to study the damage mechanisms in a sandwich polymer structure that contains three layers: two polyolefin skins and the foam core (skin–foam–skin). Specific tests on structure associated with the acoustic emission (AE) technique and tomographic observations (RX) are used to identify the damage. Initially, a conventional tensile test was performed to correlate the acoustic emission with the initiation of plasticity and damage to a polyethylene sample. The results obtained are close to those observed in other studies and it is possible to separate the signal from cavitation and propagation of necking. The technique is then employed to capture the rupture of a polymer skin on a multilayer rotomoulded structure (bottle). Tests were carried out on this bottle under internal water pressure. Three tests are performed with more or less early interruptions in order to identify the first damage and understand their evolution. Different quantities (average frequency, RA value, etc.) are observed in order to quantify and understand the perceived damage. With the AE/RX correlation and mechanical behaviour, a scenario of structural damage is proposed.

Numerical Simulation on Damage and Failure of Recycled Aggregate Concrete with a Lattice Model

2009 ◽  
Vol 417-418 ◽  
pp. 689-692 ◽  
Author(s):  
Jian Zhuang Xiao ◽  
Qiong Liu ◽  
Vivian W.Y. Tam
Keyword(s):  
Lattice Model ◽  
Structural Damage ◽  
Fortran Program ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Aggregate Model ◽  
Mixture Ratio ◽  
Aggregate Concrete ◽  
Damage And Failure ◽  
Random Aggregate

A random aggregate model of recycled aggregate concrete is developed in this paper on the base of a mixture ratio. Combining a lattice model with random aggregate of recycled aggregate concrete, lattice elements in the lattice model of recycled aggregate concrete can be classified into five types: (1) nature aggregate, (2) old hardened mortar, (3) new hardened mortar, (4) old interface transition zone (ITZ), and (5) new ITZ. The fundamental mechanical parameters of the lattice elements are chosen from the authors’ test as well as other references. A FORTRAN program of the lattice model is then written with basic theories of finite element method (FEM) for simulating the meso-structural damage of recycled aggregate concrete under uniaxial compression.

Nonlinear Dynamic Finite Analysis of BFRP-Strengthened Masonry Structure Based on ABAQUS

2014 ◽  
Vol 936 ◽  
pp. 1331-1335
Author(s):  
Zhen Lei ◽  
Yong Wang ◽  
Jun Tong Qu
Keyword(s):  
Nonlinear Dynamic ◽  
Structural Damage ◽  
Failure Process ◽  
Dynamical Analysis ◽  
Base Shear ◽  
Confined Masonry ◽  
Damage And Failure ◽  
Before And After ◽  
Concrete Damage ◽  
Strengthening Technique

The externally bonded FRP is an effective strengthening technique, which is mainly verified through laboratory tests. In this paper, numerical analysis models were established in ABAQUS respectively based on an experimental scaled three-story confined masonry structures before and after strengthened with BFRP. Then dynamical analysis considering material nonlinearity, geometric nonlinearity and contact nonlinearity was carried out on these two models. Here, representative volume element method was used to simplify the simulation of masonry. Besides, concrete damage plasticity model was adopted to simulate the structural damage and failure process. The reliability and accuracy of nonlinear dynamic finite analysis were validated by comparing the numerical simulation results and experimental results in terms of dynamic property, displacement and acceleration response and the maximum base shear.

scholarly journals Experimental Study on the Damage and Deterioration Behaviour of Deep Soft Rock under Water-Rock Interaction

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zenghui Zhao ◽  
Hao Liu ◽  
Xianzhou Lyu ◽  
Lei Wang ◽  
Zhongxi Tian ◽  
...  
Keyword(s):  
Water Content ◽  
Structural Damage ◽  
Soft Rock ◽  
Rock Interaction ◽  
Damage And Failure ◽  
Saturated Water ◽  
Diffusion Migration ◽  
Exchange Adsorption ◽  
Water Saturated ◽  
Water Contents

The ageing disintegration, the damage, and failure mechanism of water-saturated soft rock are of significance to hazard prevention for deep mining. In this paper, indoor experiments, including disintegration behaviour tests in water, uniaxial compression failure tests of rock samples with different water contents, and variations in the microstructure of mudstone under saturated water contents, were conducted. The investigation results show that the saturated water content of mudstone is 16.96% and that the rock mass bursts completely after being immersed in water for 72 h. With increasing water content, the uniaxial strength and elastic modulus at the prepeak stage present significant attenuation. However, Poisson’s ratio varies little, which indicates that the swelling of cemented mudstone is not obvious when meeting water. In addition, the failure pattern of mudstone changes from overall splitting failure to block fragmentation failure. Due to ion-exchange adsorption and the wedging action of water molecules, the edge of contact between particles changes from staggered to smooth, which leads to the expansion of pores, the loosening of mudstone structures, and a decrease in mechanical strength. Therefore, the diffusion, migration, and particle expansion of illite and other clay minerals in mudstone are the main factors leading to the structural damage and strength reduction of weakly cemented rock under water-rock interactions.

scholarly journals Numerical simulation of the dynamic response in pulse-loaded fibre–metal-laminated plates

2016 ◽  
Vol 7 (4) ◽  
pp. 469-494 ◽  
Author(s):  
Ebuka Nwankwo ◽  
Arash Soleiman Fallah ◽  
Mojtaba Moatamedi ◽  
Luke A Louca
Keyword(s):  
Dynamic Response ◽  
Structural Damage ◽  
Three Dimensional ◽  
Constitutive Models ◽  
Laminated Plates ◽  
Damage Initiation ◽  
Structural Support ◽  
Damage And Failure ◽  
Composite Glass ◽  
Fibre Metal

This article presents a three-dimensional constitutive model to replicate the dynamic response of blast-loaded fibre–metal laminates made of 2024-0 aluminium alloy and woven composite (glass fibre–reinforced polypropylene). Simulation of the dynamic response is challenging when extreme localised loads are of concern and requires reliable material constitutive models as well as accurate modelling techniques. It is well known that back layers in a fibre–metal laminate provide structural support for front layers; thus, proper modelling of constituent failure and degradation is essential to understanding structural damage and failure. The improved developed model to analyse damage initiation, progression and failure of the composite is implemented in finite element code ABAQUS, and a good correlation is observed with experimental results for displacements of the back and front faces as presented by other researchers. The model was also able to predict accurately the tearing impulses. Finally, the concepts of the ‘efficiency of the charge’ and ‘effectiveness of the target’ are proposed in the context of localised blast loading on a structure. Dimensionless parameters are introduced to quantify these parameters.

Effect of particle mass concentration on erosion characteristics of self-priming pump

2021 ◽  
pp. 095440622110007
Author(s):  
Wenqi Zhang ◽  
Shuai Yang ◽  
Dazhuan Wu ◽  
Jiegang Mou
Keyword(s):  
Structural Damage ◽  
Leading Edge ◽  
Discrete Phase Model ◽  
Suction Surface ◽  
Two Phase ◽  
Lower Velocity ◽  
Damage And Failure ◽  
Discrete Phase ◽  
Flow Medium ◽  
Solid Liquid

The self-priming pump is widely used in conveying the solid-liquid two-phase flow medium. The particles in the medium erode the components, leading to structural damage and failure. The computational fluid dynamics (CFD) model of the 65ZW30-20 self-priming pump is built to study erosion characteristics and mechanisms. FLUENT, along with the Discrete Phase Model and Oka erosion model, is applied for the numerical simulation. The particle distribution, impact times and velocity, and trajectories are taken into consideration to investigate the erosion characteristics in each component. The results show that with the increase of the particle concentration, the head and efficiency decreases gradually. The volute wall and blade leading edge are the most vulnerable regions to erosion, because of a large number of impact times and high impact velocity. Also, the particles impact the front gap wall for fewer times and the hub with lower velocity, which leads to a slighter erosion. Besides, the particle trajectories indicate that some particles impact the blade suction surface and the paraxial area of the shroud, rendering considerable erosion.

scholarly journals Risk aided design of building structures

2014 ◽  
Vol 13 (2) ◽  
pp. 367-374
Author(s):  
Szczepan Woliński
Keyword(s):  
Risk Analysis ◽  
Structural Damage ◽  
Uncertain Information ◽  
Building Structures ◽  
Safety Level ◽  
Design Elements ◽  
Damage And Failure ◽  
Relative Safety ◽  
Standard Procedures ◽  
Aided Design

The potential failure of building structures usually arises from a combination of many unspecified causes or catastrophic events whose statistical description is highly uncertain and often impossible. Assumed or calculated reliability of the structure in a case is just a notional measure that can be used to compare the relative safety level of different structures in similar circumstances. Due to the difficulties associated with the estimation of the probability of different hazards as well as the assessment of consequences and costs of the structural damage and failure, also the risk analysis provides very uncertain information on the actual level of safety of a structure. The paper presents a proposal for an indirect approach to the probabilistic design of structures based not only on specific actions, but also on the ability of the structure to survive in the unique , unusual and vaguely defined circumstances. It requires a preliminary risk analysis before the standard procedures for shaping and dimensioning design elements will be applied.

scholarly journals Evaluation of Seismic Vulnerability of Hospitals in the Tehran Metropolitan Area

Buildings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 54
Author(s):  
Setareh Ghaychi Afrouz ◽  
Alireza Farzampour ◽  
Zahra Hejazi ◽  
Masoud Mojarab
Keyword(s):  
Metropolitan Area ◽  
Structural Damage ◽  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Health Care Systems ◽  
Ground Motions ◽  
Active Faults ◽  
The United States ◽  
Damage And Failure ◽  
Proactive Management

The Tehran metropolitan area is extremely vulnerable to earthquakes due to the location of its active faults and its dense population. Assessing the probable damage of a high magnitude earthquake on buildings and facilities relies on a precise structural survey, which has an empirical basis depending on historic ground motions. The probability of damage and failure in discrete limits based on different ground motions is estimated by fragility curves. Using the most matching fragility curves for buildings in Tehran, the vulnerability of the hospitals in the capital, as one of the most critical structures in crisis management of disasters, was investigated in this study. Subsequently, the existing fragility curves, developed for Tehran and the other seismic prone countries such as Japan and the United States, were compared considering the typology of Tehran’s hospitals. Finally, the possible damages for each hospital were calculated based on the most conservative fragility curve and the most pessimistic scenario, which were used to evaluate the seismic vulnerability of hospitals and health care systems for different damage states. After zoning the damage of therapeutic areas of Tehran, it was observed that at least 2% to 10% damage occurred in all hospitals of Tehran, and none of the healthcare centers would remain structurally undamaged after a strong earthquake with the moment magnitude of 7 or more. In addition, the healthcare buildings could be prone to significant structural damage, especially in southern parts, which necessitates proactive management plans for Tehran metropolitan area.

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