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article

Health monitoring of composite car roof failure under effect of different impact velocity

Ahmed Raee Madeh, Nabel Kadum Abd-Ali

Diagnostyka > 2023 > Vol. 24, No. 4 > art. no. 223406

During this work, the roof of the car was used as an engineering application to study and monitor the occurrence of failures under the influence of various loads. The shells are made of multilayer composite materials using epoxy resin reinforced with carbon fiber and aluminium oxide granules as reinforcing materials to increase the impact resistance that vehicles may be exposed to while driving, in...

article

Strength-based topology optimization for anisotropic parts

Amir M. Mirzendehdel, Behzad Rankouhi, Krishnan Suresh

Additive Manufacturing > 2018 > 19 > C > 104-113

Additive manufacturing (AM) is emerging as a promising technology to fabricate cost-effective, customized functional parts. Designing such functional, i.e., load bearing, parts can be challenging and time consuming where the goal is to balance performance and material usage. Topology optimization (TO) is a powerful design method which can complement AM by automating the design process. However, for...

article

Prediction of cyclic behavior of WUF-W connections with various weld access hole configurations using nonlinear FEA

Sang Whan Han, Nam Hun Kim, Soon Wook Cho

International Journal of Steel Structures > 2016 > 16 > 4 > 1197-1208

The welded unreinforced flange-welded web (WUF-W) moment connection is one of seven prequalified connections for the special moment frames (SMF) specified in AISC 358-10. Previous studies reported that some WUF-W connections with a steep access hole slope failed before completing a loading cycle of 4% drift ratio. For investigating in detail the effect of access hole geometry including access hole...

article

An analysis of the influence of grain boundary strength on microstructure dependent fracture in polycrystalline tungsten

Chandra Prakash, Hongsuk Lee, Milad Alucozai, Vikas Tomar

International Journal of Fracture > 2016 > 199 > 1 > 1-20

This work examines the influence of changes in grain boundary (GB) strength on microstructure dependent crack propagation in polycrystalline tungsten (W). The property of focus is brittleness index (BI) originally introduced by Evans and Marshall in 1976 and 1979, respectively, used in order to quantify the extent of brittleness of a material. In an earlier work, GBs of Ni-doped polycrystalline W...

article

Wellbore stability model based on iterative coupling method in water alternating gas injection

Mahmood Bataee, Sonny Irawan, Syahrir Ridha

Journal of Petroleum Exploration and Production Technology > 2016 > 6 > 4 > 755-775

Ensuring wellbore integrity is the most important factor in injection well design. The water alternating gas (WAG) injection is increasingly applied globally as the effective enhanced oil recovery (EOR) method in oil wells. High injection pressure or low injection temperature could lead to compressive wellbore failure. The rock stress around the wellbore is a function of the wellbore fluid flow and...

chapter

Selection of power transmission systems based on power losses analysis and reliability analysis for interconnection of electrical grids

Reynerio E. Vasquez

2015 IEEE Thirty Fifth Central American and Panama Convention (CONCAPAN XXXV) > 1 - 5

2015 IEEE Thirty Fifth Central American and Panama Convention (CONCAPAN XXXV)

The way to choice an interconnection grid in medium or high voltage, may not be only based in the existence of a voltage level in the site or by the electrical losses level, but also include the reliability of a sub-transmission or transmission grid could give. It is shown the analysis of data since two interconnection available options for a power plant with 34.5 kV y 138 kV grids near the project...

article

Effectivness of the failure rate on maintenance costs of the city buses

P. Ignaciuk, J. Rymarz, A. Niewczas

Journal of KONBiN > 2015 > No. 3 (35) > 99--108

The purpose of this paper was to present a failure rate and maintenance cost comparison for two types of city transport buses. The paper presents in detail a case study of well known bus brands used at Municipal Transport Company in Lublin. A failure index of all functional and constructional systems of the vehicles and their technical availability with regards to calendar time was determined. The...

article

Design and Optimization of a Composite Canard Control Surface of an Advanced Fighter Aircraft under Static Loading

Sachin Shrivastava, P.M. Mohite

Curved and Layered Structures > 2015 > 2 > 1

The minimization of weight and maximization of payload is an ever challenging design procedure for air vehicles. The present study has been carried out with an objective to redesign control surface of an advanced all-metallic fighter aircraft. In this study, the structure made up of high strength aluminum, titanium and ferrous alloys has been attempted to replace by carbon fiber composite (CFC) skin,...

article

Redesigning of a Canard Control Surface of an Advanced Fighter Aircraft: Effect on Buckling and Aerodynamic Behavior

Sachin Shrivastava, P.M. Mohite

Curved and Layered Structures > 2015 > 2 > 1

A redesign of canard control-surface of an advanced all-metallic fighter aircraft was carried out by using carbon fibre composite (CFC) for ribs and panels. In this study ply-orientations of CFC structure are optimized using a Genetic-Algorithm (GA) with an objective function to have minimum failure index (FI) according to Tsai-Wu failure criterion. The redesigned CFC structure was sufficiently strong...

article

Effectiveness of various rolling processes in wire production

V. A. Kharitonov, I. V. Taranin

Steel in Translation > 2015 > 45 > 1 > 80-83

The manufacture of round wire by methods in which drawing is combined with a rolling process—such as passage through two-roller and multiroller grooves, hybrid rolling in driven and nondriven cells, and supported rolling—is considered. Finite-element modeling on the basis of DEFORM-3D software permits comparison of the risk of metal failure in these processes. All of the proposed methods are more...

chapter

The failure index of hard rock under high geostress conditions

Chen Jingtao, Wu Dongnan

2011 International Conference on Electric Technology and Civil Engineering (ICETCE) > 829 - 832

2011 International Conference on Electric Technology and Civil Engineering (ICETCE)

Yield and failure are the important content of materials' mechanical property and two different stages in the deformation process of materials which can be gained only by experiment. Based on systematic mechanical property experiment, especially true triaxial experimental which can simulate to the complicated evolvement of stress load which produced by excavating and support underground engineering...

chapter

CFMEA: Concurrent Failure Mode and Effect Analysis

N Upadhyay, B M Deshpande, V P Agrawal

2010 2nd International Conference on Reliability, Safety and Hazard - Risk-Based Technologies and Physics-of-Failure Methods (ICRESH) > 399 - 405

2010 2nd International Conference on Reliability, Safety and Hazard - Risk-Based Technologies and Physics-of-Failure Methods (ICRESH 2010)

In the paper, an attempt is made to develop Concurrent Failure Mode and Effect Analysis (CFMEA) of Component Based Software System (CBSS) using a graph theoretic approach. The proposed approach is an improvement over the present practiced procedures. Using the approach reliability evaluation of CBSS can be done effectively and extensively at the early design stage. The important feature of the proposed...

article

Adhesion failure analyses of bonded tubular single lap joints in laminated fibre reinforced plastic composites

R.R. Das, B. Pradhan

International Journal of Adhesion and Adhesives > 2010 > 30 > 6 > 425-438

This research presents a finite element based simulation technique for the analysis of adhesively bonded joints in tubular Fibre Reinforced Plastic (FRP) composite structures using Finite Element Method (FEM). Results of the bonded Tubular Single Lap Joint (TSLJ) have been compared with those available in literature and are found to be in good agreement. Effective overlap length for suitable performance...

article

Exact reliability calculation with quadratic failure indices in random vibration

Enrique de la Fuente, Miguel A. Sanz, José L. Hernando

Engineering Structures > 2010 > 32 > 3 > 793-799

Failure indices expressed as quadratic forms in the stress components are common in structural analysis to assess the failure of a structural component. For instance, the quadratic von Mises criterion is universally accepted as an adequate scalar measure to verify the onset of plasticity in ductile materials. On the other hand, some of the failure indices for composite materials proposed in the literature...

article

Stacking sequence design of composite laminates for maximum strength using genetic algorithms

J.H. Park, J.H. Hwang, C.S. Lee, W. Hwang

Composite Structures > 2001 > 52 > 2 > 217-231

This paper uses genetic algorithms (GAs) for the optimal design of symmetric composite laminates subject to various loading and boundary conditions. To analyze these laminates, the finite element method based on shear deformation theory is used. The Tsai-Hill failure criterion is taken as the fitness function, and the ply orientation angles are the design variables. In the GA, tournament selection...

article

Biaxial strength of cross-ply carbon fiber-reinforced composite laminates fabricated by lapped molding technique

C.S. Lee, W. Hwang

Materials Science & Engineering A > 1999 > 271 > 1-2 > 496 - 502

A failure criterion must be considered for each failure mode and parameters of the model determined in each case. In this study, a failure criterion was developed by introducing the notion of equivalent biaxial strength under biaxial loading of tension and torsion. The experimental results showed that the equivalent biaxial strength has a power-type relation to a parameter, cosψ. The failure strength...

article

Reliability Calculations for Electrical Transmission Systems on the Basis of Mean Failure Indices

S.K. Banerjee, B.R. Reddi

IEEE Transactions on Reliability > 1983 > R-32 > 4 > 346 - 349

In an electric power transmission network, a fault occurring on any one of its components sometimes causes an' active event' as a result of interaction between the power system and its protection system. An outage of sections adjacent to the faulted one for a small duration is characteristic of these events. In this paper, the mean failure indices (mean probability-of-failure and mean frequency-of-failure)...

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