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Featured researches published by Zhusheng Shi.


Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture | 2018

Experimental investigation of forming limit curves and deformation features in warm forming of an aluminium alloy

Zhutao Shao; Qian Bai; Nan Li; Jianguo Lin; Zhusheng Shi; Matthew Stanton; Douglas Watson; T.A. Dean

The determination of forming limit curves and deformation features of AA5754 aluminium alloy are studied in this article. The robust and repeatable experiments were conducted at a warm forming temperature range of 200 °C–300 °C and at a forming speed range of 20–300 mm/s. The forming limit curves of AA5754 at elevated temperatures with different high forming speeds have been obtained. The effects of forming speed and temperature on limiting dome height, thickness variation and fracture location are discussed. The results show that higher temperatures and lower forming speeds are beneficial to increasing forming limits of AA5754; however, lower temperatures and higher forming speeds contribute to enhancing the thickness uniformity of formed specimens. The decreasing forming speed and increasing temperature result in the locations of fracture to move away from the apexes of formed specimens. It is found that the analysis of deformation features can provide a guidance to understand warm forming process of aluminium alloys.


Key Engineering Materials | 2016

Investigation of Tensile and Compressive Creep Behaviour of AA2050-T34 during Creep Age Forming Process

Yong Li; Zhusheng Shi; Yo Lun Yang; Jianguo Lin

The tensile and compressive creep behaviour of aluminium alloy 2050 with T34 initial temper (AA2050-T34) during creep-ageing process has been experimentally investigated and analysed in detail. Both tensile and compressive creep-ageing tests under various stress levels (ranging from 100 MPa to 187.5 MPa) have been carried out at a temperature of 155 °C for 18 hours. The results show that creep strains under tensile stresses are much larger than those under the same levels of compressive stresses and a new “double primary creep feature” with five-stage creep behaviour has been observed in the alloy during the creep-ageing tests. The conventional power-law creep equation was applied to analyse the new creep behaviour of the alloy at the steady-state creep stage. Furthermore, the power-law relationship between the applied stress and the corresponding creep strain rate was found to be effective in all creep-ageing stages of the alloy and was used for further analysis. These analyses indicate that the dislocation and diffusion mechanisms may both contribute to this new creep behaviour and may play different roles in different creep-ageing stages. Moreover, the evolution of the creep resistance or threshold creep stress of the alloy during the creep-ageing process was quantitatively investigated by the proposed relationship. These results help to not only understand the new creep behaviour of AA2050-T34 during the creep-ageing process, but also facilitate further constitutive modelling of this new creep behaviour for its creep age forming applications.


Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture | 2018

An integrated model to predict residual stress reduction by multiple cold forging operations in extra-large AA7050 T-section panels

Ran Pan; Zhusheng Shi; Catrin M. Davies; Chen Li; Michael Kaye; Jianguo Lin

A finite element model has been developed to determine the effectiveness of a cold compression technique to reduce the large residual stresses generated from quenching solution heat treated T-section components of aluminium alloy AA7050. To compress long components, a multi-step process is required with some amount of overlap. A parametric study has been performed to determine the effect of the compression ratio, friction coefficient, length of overlap and length of the T-section component on the residual stress distribution post-quenching and after subsequent cold compression. Generally, a percentage reduction in the peak residual stress of over 90% was found. The optimal parameters for residual stress relief by cold compression have been suggested from the cases considered.


Applied Mechanics and Materials | 2015

Strain-Based Continuum Damage Mechanics Model for Predicting FLC of AA5754 under Warm Forming Conditions

Mohamed Mohamed; Zhusheng Shi; Jianguo Lin; T.A. Dean; John P. Dear

This paper presents a novel strain-based continuum damage mechanics (CDM) model for predicting forming limit curve (FLC) of AA5754 under warm forming conditions. The model is formulated and calibrated based on two different sets of experimental data; isothermal uniaxial tensile data at temperature range of 20-300°C and strain rate range of 0.001-10 s-1 and isothermal FLC data at temperatures range of 20-300°C and forming speeds of 20-300 mm s-1. A good agreement has been achieved between the experimental and numerical results.


Key Engineering Materials | 2016

Prediction of forming limit diagram for AA5754 using artificial neural network modelling

Mohamed Mohamed; Sherif Elatriby; Zhusheng Shi; Jianguo Lin

Warm stamping techniques have been employed to solve the formability problem in forming aluminium alloy panels. The formability of sheet metal is a crucial measure of its ability for forming complex-shaped panel components and is often evaluated by forming limit diagram (FLD). Although the forming limit is a simple tool to predict the formability of material, determining FLD experimentally at warm/hot forming condition is quite difficult. This paper presents the artificial neural network (ANN) modelling of the process based on experimental results (different temperature, 20°C-300°C and different forming rates, 5-300 mm.s-1) is introduced to predict FLDs. It is shown that the ANN can predict the FLDs at extreme conditions, which are out of the defined boundaries for training the ANN. According to comparisons, there is a good agreement between experimental and neural network results


Key Engineering Materials | 2016

The Effectiveness of Cold Rolling for Residual Stress Reduction in Quenched 7050 Aluminium Alloy Forgings

Ran Pan; Catrin M. Davies; Wei Zhang; Zhusheng Shi; Thilo Pirling; Jianguo Lin

Residual stresses are often introduced into aluminum alloys through quenching processes performed to generate the required microstructure. Such residual stresses are known to be deleterious to the integrity of the component. Methods to mitigate residual stresses in quenched components are therefore of great importance. Cold rolling has been proposed as an effective technique to remove residual stresses in large components. In this work, the effectiveness of cold rolling in reducing the residual stresses in quenched blocks AA7050 has been quantified using the neutron diffraction technique. Neutron diffraction measurements have been performed on two blocks one quenched and the other quenched & cold rolled block. Comparing the residual stress distributions pre and post rolling it has been found that cold rolling almost eliminates the tensile residual stresses in the core of the block, however it generates large tensile residual stresses d in a shallow region near the surface of the block.


Key Engineering Materials | 2016

An Investigation of Direct Powder Forging of Nickel Superalloy FGH96

Shuang Fang; Zhusheng Shi; Qian Bai; Jia Ying Jiang; Shu Yun Wang; Jianguo Lin

Powder metallurgy (PM) nickel-based superalloy has been widely used in high temperature applications and is most commonly manufactured using hot isostatic pressing (HIP). However, HIP is an expensive process and takes a long time at high temperature which leads to the formation of networks of prior particle boundaries (PPBs). In this study, a recently developed processing method - direct powder forging (DPF) was employed to produce a PM nickel-based superalloy component, using a single acting hydraulic press under normal atmosphere. EBSD study has been conducted for its microstructure, grains size distribution, and grain boundary misorientation; and mechanical testing has been carried out for its hardness and tensile properties at room temperature and 650°C. It has been found that the DPFed material has reached full density in the whole component. Networks of PPBs have been broken in the direct powder forged FGH96 alloy. Compared with HIPed FGH96 alloy, the DPFed material has a substantially higher recystallisation nucleation degree and more recrystallised sub-grains. After heat treatment, the tensile properties of the direct powder forged FGH96 alloy match or surpass those of the material produced by HIP plus isothermal forging.


Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2016

Experimental investigation of tension and compression creep-ageing behaviour of AA2050 with different initial tempers

Yingrui Li; Zhusheng Shi; Jianguo Lin; Yo-Lun Yang; Bo-Ming Huang; Tsai-Fu Chung; J.R. Yang


Journal of Materials Processing Technology | 2015

Creep-age forming AA2219 plates with different stiffener designs and pre-form age conditions: Experimental and finite element studies

Aaron C.L. Lam; Zhusheng Shi; Haoliang Yang; Li Wan; Catrin M. Davies; Jianguo Lin; Shijie Zhou


The International Journal of Advanced Manufacturing Technology | 2017

Application of a continuum damage mechanics (CDM)-based model for predicting formability of warm formed aluminium alloy

Qian Bai; M. Mohamed; Zhusheng Shi; Jianguo Lin; T.A. Dean

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Jianguo Lin

Imperial College London

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Yo-Lun Yang

Imperial College London

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Yong Li

Imperial College London

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Qi Rong

Imperial College London

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T.A. Dean

University of Birmingham

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Bo-Ming Huang

National Taiwan University

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Tsai-Fu Chung

National Taiwan University

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