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Arjunan A.,University of Wolverhampton | Wang C.J.,University of Wolverhampton | Yahiaoui K.,University of Wolverhampton | Mynors D.J.,University of Sussex | And 2 more authors.
Building and Environment | Year: 2013

Optimum acoustic performance of building components is a fundamental factor towards sustainable building design. Accordingly, it is essential that designers have the capability to effectively predict the acoustic performance to achieve sustainable designs. This paper introduces a 2-D Harmonic Acoustic Finite Element Analysis to predict the sound insulation of stud based double-leaf walls. This research was motivated by the necessity to develop acoustically efficient light weight building structures, which are both affordable and sustainable. Prediction of the Sound Reduction Index (R) of plasterboard partitions with structural links is a challenging problem due to the fluid-structure interaction (FSI) between the structural and fluid systems. Several finite element models to predict the sound reduction index of double-leaf walls were developed in compliance with BSENISO 717 and 140. The validity of the finite element predictions were assessed by comparison with experimental test results carried out in a certified laboratory. The effect of using different mesh sizes, fixing mechanisms and sound source locations on the predicted sound reduction index were looked into. The effects of air humidity and temperature on the experimental measurements of R values were also investigated. The FEA model presented in this work is capable of predicting the weighted sound reduction index (Rw) along with A-weighted pink noise (C) and A-weighted urban noise (Ctr) to within an accuracy of ±1dB. Furthermore, the finite element modelling procedure reported can be extended to efficiently predict the acoustic behaviour of other building components undergoing FSI. © 2013 Elsevier Ltd.

Wang C.J.,University of Wolverhampton | Mynors D.J.,University of Wolverhampton | Morgan T.,Hadley Industries Plc | Cartwright B.,Hadley Industries Plc
Applied Mechanics and Materials | Year: 2012

Sleeved purlin systems are usually used in roof constructions. A non-linear relationship between the bolt hole extension and the load transferred to the bolt was derived with experimental testing and numerical simulation. Consequently, the non-linear rotational stiffness of sleeved joints was derived based on the configuration of sleeves in this paper. The procedure for calculating the deflection of purlin systems with non-linear rotational stiffness at the joints is presented. The analysis and calculation of the deflection is demonstrated through a case study © (2012) Trans Tech Publications, Switzerland.

Nguyen V.B.,University of Wolverhampton | Nguyen V.B.,Hadley Industries Plc | Wang C.J.,University of Wolverhampton | Mynors D.J.,University of Sussex | And 2 more authors.
Journal of Manufacturing Processes | Year: 2014

The dimpling process is a novel cold-roll forming process that involves dimpling of a rolled flat strip prior to the roll forming operation. This is a process undertaken to enhance the material properties and subsequent products' structural performance while maintaining a minimum strip thickness. In order to understand the complex and interrelated nonlinear changes in contact, geometry and material properties that occur in the process, it is necessary to accurately simulate the process and validate through physical tests. In this paper, 3D non-linear finite element analysis was employed to simulate the dimpling process and mechanical testing of the subsequent dimpled sheets, in which the dimple geometry and material properties data were directly transferred from the dimpling process. Physical measurements, tensile and bending tests on dimpled sheet steel were conducted to evaluate the simulation results. Simulation of the dimpling process identified the amount of non-uniform plastic strain introduced and the manner in which this was distributed through the sheet. The plastic strain resulted in strain hardening which could correlate to the increase in the strength of the dimpled steel when compared to plain steel originating from the same coil material. A parametric study revealed that the amount of plastic strain depends upon on the process parameters such as friction and overlapping gap between the two forming rolls. The results derived from simulations of the tensile and bending tests were in good agreement with the experimental ones. The validation indicates that the finite element analysis was able to successfully simulate the dimpling process and mechanical properties of the subsequent dimpled steel products. © 2014 The Society of Manufacturing Engineers.

Nguyen B.,Hadley Industries Plc | Nguyen B.,University of Sussex | Morgan T.,Hadley Industries Plc | English M.,Hadley Industries Plc | Castellucci M.,Hadley Industries Plc
Building Acoustics | Year: 2015

Cold-formed steel studs are often used in lightweight partition walls to provide structural stability but in the same time they change the acoustic performance of the whole system. The overall design of such lightweight structures for acoustic sound insulation becomes very complicated as the sound passing through stud needs to be quantified. One of the greatest challenges is to characterize the stud's geometric effects on the sound transmission of the partition walls. This paper presents a 2-D Finite Element modelling approach and results into the vibro-acoustic performance of different studs in double-leaf walls which are placed in between a reverberant source room and a receiving room. The acoustic medium inside rooms was modelled using fluid elements and the structure was modelled with plane strain elements. The interaction between the acoustic medium and the structure was modelled in a coupled structural-acoustic analysis. An FE modelling setup which includes appropriate model parameters to be used in the structuralacoustic analysis was presented. The FE sound reduction of double-leaf walls using two different stud profiles was then calculated. Experimental tests complying with standards ISO 717-1:1997 and 140-3:1995 were also carried out to evaluate the FE results. It has shown that the stud's shape have significant effects on the sound reduction of the double-leaf walls, and the FE results have similar trends are in fair agreement with the experimental results. A parametric study was conducted and the effects of the stud's shapes on the sound reduction were presented and discussed.

Nguyen V.B.,Hadley Industries Plc | Nguyen V.B.,Honorary Senior Research Fellow | Mynors D.J.,University of Sussex | Wang C.J.,University of Sussex | And 2 more authors.
Finite Elements in Analysis and Design | Year: 2016

Dimpled steel products are produced from the combination of an innovative dimpling process and a traditional forming process such as cold-roll forming or press-braking. The wider use of cold-formed dimpled steel members has promoted considerable interest in the local instability and strength of these members. Of particular interest is their buckling behaviour and ultimate strength capacity in columns under compressive loading. However, the dimpling process produces cold-formed sections with a complex 'dimpled' surface topography and the 'dimpled' material is non-uniformly work hardened through the entire thickness. Owing to these complex issues, there are no existing analytical and design methods to calculate the buckling strength of dimpled products and validate against physical measurements. This paper presents the analysis of the compressive behaviour of cold-formed channel and lipped channel dimpled steel columns using Finite Element techniques. True stress-strain data obtained from physical tests were incorporated into nonlinear simulations of dimpled steel columns. It was found that the predicted buckling and ultimate loads correlated well with the experimental results. Based on the validated Finite Element results for different geometries, standard design formulae for determining buckling and ultimate loads of channel and lipped channel dimpled columns were developed. It is demonstrated that the Finite Element Analysis can therefore be used to analyse and design cold-formed dimpled steel columns. © 2015 Elsevier B.V. All rights reserved.

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