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Influence of adhesive on dynamic performance of steel/Al electromagnetic clinched joints

Liao Yuxuan, Zhong Jiabao, Li Guangyao, Cui Junjia, Jiang Hao

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e177, 2022

In this paper, the dynamic behavior of clinched, bonded and clinch-bonded joints for steel/Al was investigated. Three tensile speeds (1 m/s, 5 m/s, and 10 m/s) were selected. The strain evolution of three kinds of joints was analyzed by the digital image correlation (DIC) technique. The mechanical properties and failure mechanism of joints were obtained. The result showed that the shear strength and energy absorption of joints were both increased as the tensile speed increased. When the tensile speed increased from 1 to 10 m/s, the peak loads of clinched joints, bonded joints and clinch-bonded joints were increased by 26.7%, 17.5% and 16.3%, respectively. The energy absorption of three kinds of joints were increased by 35.4%, 27.3%, and 29.0%, respectively. Besides, the addition of adhesive effectively improved the shear strength and energy absorption of the joint compared to clinched joints. Specifically, the peak load and energy absorption were increased by nearly three times and thirteen times, respectively. The failure modes of clinched joint ranged from mixed failure to neck failure. While the failure modes of bonded joint were mixed failure at different tensile speeds. For clinch-bonded joint, the failure modes of interlock structure were the neck failure and the failure modes of adhesive layer were mixed failure. With the increase of the tensile speed, the cohesive failure area of bonded joint and clinch-bonded joint decreased, and the damage degree of mechanical interlock was more serious for clinched joint.

Evaluation of a tensile test for the determination of the material behaviour of filament yarns under high strain rates

Cherif C, Seidel A., Younes A., Hausding J.

Autex Research Journal

2010

Vol. 10, no. 4

88--94

In many technical applications, fibre-reinforced composites with textile high-performance fibres made of carbon or glass are being used. The fibres qualify for their high strength and stiffness due to their physical and chemical characteristics. It is necessary to guarantee a high safety level under all possible loading constellations. Besides the usual service loads, the topic of extreme loads that work along with high forces and high impact velocity is of increasing importance. For these so-called impact loads, the processes within the structural components have to be analysed and material models suitable for prognoses should be derived from them. The existence of suitable test machines and test methods is a prerequisite for that, yet for filament yarns they are not state of the art. Hence, tensile tests with high strain rates on filament yarns are performed on standard high-speed tensile testing machines. This leads to problems when analysing and interpreting the results and therefore, it is necessary to develop special testing machines for filament yarns.