Yuanpeng Liu¹, Kun Chen^1,2, Guang Zeng¹, Zhenghe Wang¹, Meixin Ge¹, Yishuai Zhang¹

Revista Internacional de Métodos Numéricos para Cálculo y Diseño en Ingeniería, Vol.40, No.2, pp. 1-8, 2024, DOI:10.23967/j.rimni.2024.05.004 - 21 May 2024

Abstract The theoretical model of bobbin tool friction stir welding (BT-FSW) structure and dynamic process is established. Because of the great differences in properties of different materials, the mathematical relationship between material stress and deformation will be expressed based on 3D transient heat conduction equation and J-C constitutive model. The BT-FSW process of 7075 and AZ31B was analyzed by finite element method, and the field distribution, thermal cycle curve and stress distribution characteristics of different welding areas of the welded material were simulated. To predict and control the non-equilibrium distribution of welding temperature and stress field,… More >

S. S. Pulla¹, Y. C. Lu²

CMC-Computers, Materials & Continua, Vol.29, No.3, pp. 263-278, 2012, DOI:10.3970/cmc.2012.029.263

Abstract The nanoindentation technique is used to quantify the interfaces between dissimilar materials. The interfaces can be generally referred as to the transition regions in polymers due to environmental aging, or the regions between fibers and polymer matrix in composites, or other similar situations. It is proposed to use a nanoindenter equipped with small spherical tip to cross-indent the interfaces of dissimilar materials. The nanoindentation tests were carried out through 3-dimensional finite element simulations with varying properties of the two dissimilar materials, including various combinations of modulus (E₁/E₂), yield strength (σ_y1/σ_y2), hardening index (n₁/n₂), and the interface sizes More >