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        INFLUENCE OF DIFFERENT UV EXPOSURE TIME ON THE CFRP/ALUMINUM SINGLE LAP JOINTS STRENGTH AND FRACTURE MODES

        Salah Mahdi Khaleel,Bernard Rolfe,Riyadh Al-Ameri,Tim Hiliditch 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.2

        The urging need to reduce the harmful emissions required a thorough investigations into the methods of utilizing the dissimilar lightweight materials in modern automobile, aviation and marine industries. With the exception use of dissimilar materials, traditional joining methods become limited or incapable to maintain safety standards. The adhesive bonding, therefore, seems an ideal choice to overcome this limitation due to uniform stress distribution, fatigue resistance and sound isolation. However, the role of environmental degradation become vital in the areas where the joints exposed directly or indirectly to the sunlight, humidity and extreme change in the temperature. With such key industries, intensive work to comply with safety standards are crucial. The current work devoted to examining the influence of Ultra-Violet (UV) exposure on three different Carbon Fiber Reinforced Polymer (CFRP) setup of Aluminum-CFRP single lap joint with respect to strength and fracture mode. The samples exposed to the specified UV dosage of three exposure duration then tested mechanically based on ASTM standards. The outcomes indicate that the fracture modes are highly affected by the CFRP orientation as well as the UV exposure time. Moreover, the joint strength decreases with increases of the UV exposure time.

      • The effect of skin passing on the material behavior of metal strip in pure bending and tension

        Matthias Weiss,Will Ryan,Bernard Rolfe,Chunhui Yang 한국소성가공학회 2010 기타자료 Vol.2010 No.6

        The metal strip used in roll forming has often been preprocessed by (tension or roller) leveling or by skin-pass rolling, and as a consequence, may contain residual stresses. These stresses are not well observed by the tensile test, but could have a significant effect on the bending and springback behavior. With the advent of improved process design techniques for roll forming, including advanced finite element techniques, the need for precise material property data has become important. The major deformation mode of roll forming is that of bending combined with unloading and reverse bending, and hence property data derived from bend tests could be more relevant than that from tensile testing. This work presents a numerical study on the effect of skin passing on the material behavior of stainless steel strip in pure bending and tension. A two dimensional (2-D) numerical model was developed using Abaqus Explicit to analyze the affect of skin passing on the residual stress profile across a section for various working conditions. The deformed meshes and their final stress fields were then imported as pre-defined fields into Abaqus Standard, and the post-skin passing material behavior in pure bending was determined. The results show that a residual stress profile is introduced into the steel strip during skin passing, and that its shape and stress level depend on the overall thickness reduction as well as the number of rolling passes used in the skin passing process. The material behavior in bending and the amount of springback changed significantly depending on the skin pass condition.

      • Numerical Simulations on Warm Forming of Stainless Steel with TRIP-Effect

        Xiumei Wang,Chunhui Yang,Bernard Rolfe 한국소성가공학회 2010 기타자료 Vol.2010 No.6

        In steels with TRIP-effect, a phase transformation from the retained-austenite to martensite occurs during forming, and it significantly affects hardening behaviours. Such an effect is sensitive to the amount of strain as well as the temperature variation. For materials with a strong TRIP-effect, new forming techniques are needed to develop that can lead to lighter and stronger components in automotive industry. This paper presents a coupled thermo-mechanical finite element modelling and simulation of a warm deep drawing of austenitic stainless steel (including a TRIP-effect) using LS-DYNA and temperature effect on forming process of such materials is investigated.

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