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Author

Shufeng Zhang

Other affiliations: University of Southampton
Bio: Shufeng Zhang is an academic researcher from National University of Defense Technology. The author has contributed to research in topics: Materials science & Fibre-reinforced plastic. The author has an hindex of 9, co-authored 41 publications receiving 318 citations. Previous affiliations of Shufeng Zhang include University of Southampton.


Papers
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Journal ArticleDOI
TL;DR: In this article, the design and development of a modified Arcan fixture (MAF) is described, which enables the application of pure compression or high compression to shear bidirectional loading conditions that is not possible with conventional Arcan fixtures.
Abstract: The design and development of a modified Arcan fixture (MAF) is described. The purpose of the fixture is to characterise polymer foam materials with respect to their tensile, compressive, shear and bidirectional mechanical properties. The MAF enables the application of pure compression or high compression to shear bidirectional loading conditions that is not possible with conventional Arcan fixtures. The tensile and shear behaviour to failure of a cross-linked Divinycell H100 PVC foam core material are studied using Digital Image Correlation (DIC). A detailed investigation of the parasitic effects of the fixture and misalignment of the fixture and loading machine are discussed. Thermoelastic Stress Analysis (TSA) is used to directly examine and validate the uniformity and symmetry of the stress fields obtained for both tensile and shear specimens. To account for the inhomogeneity of the strain field across the specimen cross sections, a “correction factor” for the measured “gauge section” surface strains has been determined using nonlinear finite element analysis (FEA). The outcome is a set of validated mechanical properties that are in excellent agreement with material property measurements conducted using conventional test tensile and shear test fixtures.

70 citations

Journal ArticleDOI
TL;DR: In this article, a new methodology to characterise the elastic properties of polymeric foam core materials at elevated temperatures is proposed, based on digital image correlation (DIC) data.
Abstract: A new methodology to characterise the elastic properties of polymeric foam core materials at elevated temperatures is proposed. The focus is to determine reliable values of the tensile and compressive moduli and Poisson’s ratio based on strain data obtained using digital image correlation (DIC). In the paper a detailed coverage of the source of uncertainties in the experimental procedure is provided. The uncertainties include those associated with the load introduction, the measurement and the data processing. The design of the specimens and loading jigs are developed and assessed in terms of the introduction of uniform strain. It is shown that due to the mismatch in stiffness between the jig material and the foam the introduction of a uniform strain through the cross section of the specimens is difficult to obtain. A means for correcting for the non-uniform strain across the specimen cross section is developed. To validate the methodology, tests are firstly conducted at room temperature on Divinycell PVC H100 foam. It is shown that the material is highly anisotropic with a stiffness of 50% less in the plane of the foam sheet compared to the through-thickness direction. It is also shown that because of the compliance of the foam, jig misalignment causes large errors in the measurement, and a means for correcting for this is defined. Tests are then conducted in a temperature controlled chamber at elevated temperatures ranging from 20°C to 90°C. A nonlinear reduction in Young’s modulus is obtained with significant degradation occurring after 70°C. The Poisson’s ratio remains fairly stable at different temperatures. A strong theme in the paper is the accuracy and precision of the DIC data and the factors which introduce scatter in the data, along with the uncertainties that this introduces. Particular attention is paid to the affect of the correlation parameters on the derived strain data.

52 citations

Journal ArticleDOI
TL;DR: In this paper, a comparative investigation and discussion on the influence of laminate thickness uncertainty on the reliability of laminated composite is provided, where the authors provide a comparative analysis and discussion of the impact of uncertainty on reliability of the composite.
Abstract: The present study provides a comparative investigation and discussion on the influence of laminate thickness uncertainty on reliability of laminated composite. Laminate thickness uncertainty in thr...

33 citations

Journal ArticleDOI
TL;DR: In this article, the effect of statistical correlation between ply mechanical properties on reliability of fiber reinforced plastic composite structures was investigated, and the failure probability of laminate plates was calculated in cases considering and not considering the statistical correlation, using the Monte Carlo and Markov Chain Monte Carlo methods, respectively.
Abstract: The reliability evaluation of fibre reinforced plastic composite structures are currently receiving more attention in industry. However, possible statistical correlation between ply mechanical properties has not been comprehensively concerned. The present study conducts an investigation on the effect of statistical correlation between ply mechanical properties on reliability of fibre reinforced plastic composite structures. The statistics of the ply mechanical properties are derived based on micro-mechanical model, and significant statistical correlation between ply mechanical properties is observed. Then, the failure probability of laminate plates is calculated in cases considering and not considering the statistical correlation, using the Monte Carlo and Markov Chain Monte Carlo methods, respectively. The results highlight the importance of accounting for the statistical correlation between ply mechanical properties to achieve accurate failure probability of laminate plates. Furthermore, it is found tha...

23 citations

Journal ArticleDOI
01 Feb 2015
TL;DR: In this article, the authors present several performance indicators of the products which gradually degradate over time, such as high-reliability and long-lifetime products are often exposed to a variety of stresses in use condition.
Abstract: High-reliability and long-lifetime products are often exposed to a variety of stresses in use condition, and there are usually multiple performance indicators of the products which gradually degrad...

23 citations


Cited by
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Journal ArticleDOI
TL;DR: A review of modern trends in theoretical developments, novel designs and modern applications of sandwich structures can be found in this paper, where the most recent literature published at the time of writing this review is considered, older sources are listed only on as-needed basis.
Abstract: The review outlines modern trends in theoretical developments, novel designs and modern applications of sandwich structures. The most recent work published at the time of writing of this review is considered, older sources are listed only on as-needed basis. The review begins with the discussion on the analytical models and methods of analysis of sandwich structures as well as representative problems utilizing or comparing these models. Novel designs of sandwich structures is further elucidated concentrating on miscellaneous cores, introduction of nanotubes and smart materials in the elements of a sandwich structure as well as using functionally graded designs. Examples of problems experienced by developers and designers of sandwich structures, including typical damage, response under miscellaneous loads, environmental effects and fire are considered. Sample applications of sandwich structures included in the review concentrate on aerospace, civil and marine engineering, electronics and biomedical areas. Finally, the authors suggest a list of areas where they envision a pressing need in further research.

412 citations

Journal ArticleDOI
01 Jul 1949-Nature
TL;DR: In this article, Zener uses the term "anelasticity" to describe the properties of solids, as a result of which stress and strain are not uniquely related.
Abstract: WHEN metals are submitted to stress, the stress/swain relation is generally regarded as consisting of two parts, the elastic region and the region bfsplastiwin which a permanent set remains upon the remova of the stress. In the elastic region the absence of a permanent set does not necessarily imply that the relation between stress and strain is linear of even single-valued. Prof. Zener uses the term ‘anelasticity’ to describe the properties of solids, as a result of which stress and strain are not uniquely related. Examples are the elastic after-effect, the dependence of elastic constants on the method of measurement, and the dissipation of energy during vibration, which is often referred to as the damping capacity or internal friction of a solid. These effects have aroused much interest in recent years, largely owing to Prof. Zener's own work, and a good book on the subject is much to be desired. Elasticity and Anelasticity of Metals By Clarence Zener. Pp. x + 170. (Chicago: University of Chicago Press, London: Cambridge University Press, 1948.) 4 dollars.

235 citations

Journal ArticleDOI
01 Aug 2020
TL;DR: A review of the issues concerning sandwich structures for aeronautical applications is presented in this paper, starting with early examples from the 1930s and the Second World War and the growth in the use of sandwich materials in civil and military applications.
Abstract: This paper presents a review of the issues concerning sandwich structures for aeronautical applications. The main questions raised by designers are first recalled and the complexity of sandwich structure design for aeronautics is highlighted. Then a review of applications is presented, starting with early examples from the 1930s and the Second World War. The growth in the use of sandwich materials in civil and military applications is then developed. Recent research and innovations conclude the paper.

128 citations