scholarly journals Theoretical Analysis of Bulletproof Capability of Multilayer Ceramic Composites Subjected to Impact by an Armor Piercing Projectile

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yu-Liang Chen ◽  
Wen-Kuan Huang ◽  
Jau-Nan Yeh
Keyword(s):  
Theoretical Analysis ◽  
Failure Modes ◽  
Ceramic Composites ◽  
Analysis Model ◽  
Target Plate ◽  
Residual Velocity ◽  
External Work ◽  
Deformation Work ◽  
Multilayer Ceramic ◽  
Ballistic Tests

Inspired by the theories of Tate and Zaera, a theoretical analysis model including the erosion of the projectile, the cracking of ceramic composites, and the deformation of metal backplate was established in this study to investigate the bulletproof capability of the ceramic composites under impact by an armor piecing projectile (AP). The analysis results were verified by ballistic tests. As for the ceramic composites, the volume of the cracked ceramic conoid and the change in the compressive strength were included. Regarding the deformation of the metal backplate, the plastic deformation work, the external work, and the conservation of kinetics were considered. Based on the thickness of the target plate, failure modes were separated into the plug type and the petal type. The ordinary differential equation solver of MATLAB, ode45, was adopted to solve relevant ordinary differential equations. In this study, the powder metallurgy was used to produce the Al2O3/ZrO2 multilayered ceramic composites of three layers; each layer was 3 mm in thickness. The ceramic composites were paired with a backplate made of 6061-T6 aluminum alloy with a thickness of either 1 mm or 4 mm. The ballistic tests were executed by using 0.30″ AP projectiles to impact the specimens. The results from theoretical model and ballistic tests were compared and shown consistent in the field of residual velocity, residual bullet mass, and the failure modes of the metal backplate.

Safety Analysis Model of DUCG Based on FMEA/FTA

2018 ◽  
Author(s):  
Zhenxu Zhou ◽  
Hao Nie ◽  
Chunling Dong ◽  
Qin Zhang
Keyword(s):  
Failure Modes ◽  
Fault Tree Analysis ◽  
Safety Analysis ◽  
Nuclear Industry ◽  
Analysis Model ◽  
Industrial Systems ◽  
The Past ◽  
Research Cycle ◽  
Dynamic Uncertain Causality Graph ◽  
Analytical Power

Failure Modes and Effects Analysis (FMEA) is a useful tool to find possible flaws, to reduce cost and to shorten research cycle in complex industrial systems. Fault Tree Analysis (FTA) has gained credibility over the past years, not only in nuclear industry, but also in other industries like aerospace, petrochemical, and weapon. Both FMEA and FTA are effective techniques in safety analysis, but there are still many uncertain factors in them that are not well addressed until now. This paper combines FMEA and FTA based on Dynamic Uncertain Causality Graph (DUCG) to solve this issue. Firstly, the FMEA model is mapped into a corresponding DUCG graph. Secondly, FTA model is mapped into a corresponding DUCG graph. Thirdly, combine the above DUCG graphs. Finally, users can modify the combined DUCG graph and calculations are made. This paper bridges the gap between FMEA and FTA by combining the two methods using DUCG. And additional modeling power and analytical power can be achieved with the advantages of the combined DUCG safety analysis model and its inference algorithm. This method can also promote the application of DUCG in the system reliability and safety analysis. An example is used to illustrate this method.

scholarly journals Performance Analysis of Switched Control Systems Under Common-source Digital Upsets Modeled by MDHMM

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Rui Wang ◽  
Yanxiao Li ◽  
Hui Sun ◽  
Youmin Zhang ◽  
Yigang Sun
Keyword(s):  
Theoretical Analysis ◽  
Control Systems ◽  
Systems Design ◽  
Performance Degradation ◽  
Common Source ◽  
Complex Environments ◽  
Analysis Model ◽  
Redundant Design ◽  
Control Systems Design ◽  
The Relationship

This paper proposes the theoretical model to analyze the performance degradation of control systems subject to common-source digital upsets. In this paper, a multidimensional hidden Markov model (MDHMM) is used to characterize the correlated upsets and reveals the relationship between complex environments and stochastic random digital upsets injected into the control systems. These digital upsets coming from artificial complex environments are operated on distributed redundant processing controllers. Furthermore, this paper develops the theoretical analysis model for performance degradation of control systems under common-source digital interferences modeled by MDHMM. Theoretical estimations for different redundant configurations are analyzed. Then corresponding simulation verifications for a specific control system are also conducted in details and compared with the theoretical analysis results. These analyses can help to select an optimal redundant design and provide an example for control systems design. This analysis also helps to balance the performance of system, reliability of system, and costs of system design in applications.

scholarly journals Eco-Innovation by Anticipatory Failure Determination (AFD) Method

2019 ◽  
Vol 1 (1) ◽  
pp. 3271-3280
Author(s):  
Jahau Lewis Chen ◽  
Chuan Hung
Keyword(s):  
Functional Analysis ◽  
Failure Modes ◽  
Public Image ◽  
Engineering System ◽  
Analysis Model ◽  
Innovative Design ◽  
Environmental Consequences ◽  
Model Substance ◽  
Complex Engineering ◽  
Potential Failure

AbstractThis paper presents an eco-innovation method by revised the “Anticipatory Failure Determination (AFD)” method which is the failure analysis tools in TRIZ theory. Using the functional analysis to list the system process and make the functional analysis model. Based on the environmental efficiency factors and functional analysis model, Substance-Field inverse analysis can find a lot of failure modes in the system. In order to assess the priority of risk improvement, the designer can calculate the environmental risk priority number including controlling documents, public image and environmental consequences. Designer can quickly find out the potential failure mode in the complex engineering system with the systematic steps. The TRIZ methods are used for finding eco-innovation idea to solve failure problem. The capability of the whole eco-innovative design process was illustrated by the electrical motorcycle case.

Theoretical Analysis and Simulation of Microwave Drill for Rock

2014 ◽  
Vol 962-965 ◽  
pp. 886-889
Author(s):  
Zong Gang Wang ◽  
Zhen Wei
Keyword(s):  
Theoretical Analysis ◽  
Electric Field Intensity ◽  
Near Field ◽  
Rock Breaking ◽  
Thermal Runaway ◽  
Field Energy ◽  
Microwave Generator ◽  
Analysis Model ◽  
Microwave Assisted ◽  
System Equations

The paper analyzed the process of the microwave drill for rock, and established the theoretical analysis model and the system equations. And through the numerical simulation, the electric field intensity and the temperature of the top of the microwave generator increased with the increase of the depth that the conductor was inserted, and the thermal runaway effect was strengthened. So the microwave assisted rock breaking scheme with microwave near field energy and thermal runaway effect is feasible.

scholarly journals Maintenance strategy selection for multi-component systems using a combined analytic network process and cost-risk criticality model

2019 ◽  
Vol 233 (2) ◽  
pp. 89-104 ◽  
Author(s):  
Mahmood Shafiee ◽  
Ashraf Labib ◽  
Jhareswar Maiti ◽  
Andrew Starr
Keyword(s):  
Process Model ◽  
Failure Modes ◽  
Analytic Network Process ◽  
Design Stage ◽  
Maintenance Strategy ◽  
Analysis Model ◽  
Component Systems ◽  
Network Process ◽  
Criticality Analysis ◽  
Cost Risk

Selection of an appropriate maintenance strategy for multi-component systems is a very complex task due to diversity of components and their different failure modes, existence of various dependencies among components and a large number of competing criteria that need to be taken into consideration. This study presents a combined analytic network process and cost-risk criticality analysis model to select a cost-effective, low-risk maintenance strategy for different sets of components of a complex system. The proposed model consists of four maintenance alternatives (i.e. failure-based, time-based, risk-based and condition-based), among which the most appropriate strategy, on the basis of two criteria of maintenance implementation costs and failure criticality, is to be chosen. The former criterion includes the annual maintenance expenditure required for hardware, software and personnel training, while the latter criterion focuses on the capability of maintenance in reducing the failure vulnerability and enhancing the reliability and resilience. The possible dependencies among selection criteria as well as the failure interactions between components are taken into account to evaluate the maintenance alternatives. Finally, the model is applied to determine a suitable maintenance strategy for a new wind turbine configuration consisting of several mechanical, electrical and auxiliary components at the design stage. The results are compared with practices of maintenance over the first year of system operation as well as with the results obtained from an analytic hierarchy process model.

Structural Reliability and Human Error of Reinforced-Concrete Building during Construction

2011 ◽  
Vol 368-373 ◽  
pp. 1365-1369 ◽  
Author(s):  
Xue Xia Yuan ◽  
Wei Liang Jin
Keyword(s):  
Reinforced Concrete ◽  
Reliability Analysis ◽  
Human Error ◽  
Structural Reliability ◽  
Failure Modes ◽  
Error Rates ◽  
Analysis Model ◽  
Human Reliability ◽  
Human Reliability Analysis ◽  
Supporting System

In view of the significant failure modes of formwork-supporting system and reinforced- concrete member, the reliability analysis model of time-dependent system affected by human errors during the construction of typical multistory reinforced-concrete buildings was developed. Human Reliability Analysis (HRA) method was applied to simulate the error rates and error magnitudes of the reinforced-concrete members and the formwork-supporting system, and human reliability models were developed, two cases for error-free case and error-included case were considered. Furthermore the check emphasis of formwork-supporting system was pointed during multistory building construction.

Study on the Analysis Model of the Self-Centering Wall

2013 ◽  
Vol 353-356 ◽  
pp. 1850-1857 ◽  
Author(s):  
Xiao Bin Hu ◽  
Wen Xia Li ◽  
Hao Xiang ◽  
Hui Gao He
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Theoretical Analysis ◽  
Mechanical Behavior ◽  
Numerical Simulations ◽  
The Self ◽  
Hysteresis Curve ◽  
Analysis Model ◽  
Horizontal Connection ◽  
Analysis Models

The self-centering wall including both prestressed tendons and dampers is proposed in this paper, and the corresponding general finite element numerical analysis model, simplified numerical analysis model and theoretical analysis model were established respectively, focusing on how to simulate the prestressed tendons, dampers and the horizontal connection between the wall and the foundation. The numerical simulations of the self-centering wall subjected to reversal loading were performed using the above two numerical analysis models, and the results were compared to those obtained from theoretical analysis. It is indicated that the hysteresis curve of the self-centering wall under reversal loading exhibits flag shape and no residual displacement exists after the wall is unloaded completely. The numerical analysis results match well with those from theoretical analysis, which shows the two numerical analysis models proposed in this paper can be well used to capture the mechanical behavior of the self-centering wall.

scholarly journals Elastic Properties of the Fabric Liner and Their Influence on the Wear Depth of the Spherical Plain Bearing

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xuejin Shen ◽  
Pandong Gao ◽  
Zhaolei Liu ◽  
Xiaoyang Chen
Keyword(s):  
Optimal Design ◽  
Theoretical Analysis ◽  
Elastic Properties ◽  
Woven Fabric ◽  
Wear Depth ◽  
Plain Bearing ◽  
Analysis Model ◽  
Compliance Matrix ◽  
Wear Reduction ◽  
Spherical Plain Bearing

The major failure mechanism of typical spherical plain bearings with self-lubrication is the wear of the woven fabric liner, which is an orthotropic composite of different elastic properties in different directions. The elastic properties of the liner are required for studying the tribological properties of the spherical plain bearings. This paper aims to develop an elastic property analysis model suitable for three commonly used fabric liners through a theoretical analysis of the elastic properties in order to obtain the parameter expression of the compliance matrix. The influence of the elastic properties on the wear depth of the spherical plain bearings is further investigated. Suggestions are made for the optimal design of the spherical plain bearings based on wear reduction.

scholarly journals A numerical study of projectile impact on thin aluminium plates

2009 ◽  
Vol 223 (11) ◽  
pp. 2519-2530 ◽  
Author(s):  
M Raguraman ◽  
A Deb ◽  
G Jagadeesh
Keyword(s):  
High Speed ◽  
Failure Modes ◽  
Numerical Study ◽  
Impact Testing ◽  
Good Prediction ◽  
Residual Velocity ◽  
Shell Elements ◽  
Simulation Based ◽  
Mesh Density ◽  
The Impact

This article deals with a simulation-based study of the impact of projectiles on thin aluminium plates using LS-DYNA by modelling plates with shell elements and projectiles with solid elements. In order to establish the required modelling criterion in terms of element size for aluminium plates, a convergence study of residual velocity has been carried out by varying mesh density in the impact zone. Using the preferred material and meshing criteria arrived at here, extremely good prediction of test residual velocities and ballistic limits given by Gupta et al. (2001) for thin aluminium plates has been obtained. The simulation-based pattern of failure with localized bulging and jagged edge of perforation is similar to the perforation with petalling seen in tests. A number of simulation-based parametric studies have been carried out and results consistent with published test data have been obtained. Despite the robust correlation achieved against published experimental results, it would be prudent to conduct one's own experiments, for a final correlation via the present modelling procedure and analysis with the explicit LS-DYNA 970 solver. Hence, a sophisticated ballistic impact testing facility and a high-speed camera have been used to conduct additional tests on grade 1100 aluminium plates of 1 mm thickness with projectiles of four different nose shapes. Finally, using the developed numerical simulation procedure, an excellent correlation of residual velocity and failure modes with the corresponding test results has been obtained.

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