Numerical Comparison of Cruciform weld and Butt weld simulation and a Study of Fracture Mechanics on Two Types of Welds

Abstract

The modeling of the welding is desirable to guess the deformation of the components during manufacture, the position and the magnitude of maximum residual stresses and to envisage metallurgical effects in specific zones. The welding are problems of complex modeling requiring the thermal and structural solutions. This has to lead to the development of several software packages and codes for simulation by finite elements. The welding condition, the properties of the structure and their interactions have significant influences on the thermal and structural responses (temperature history, distortion, and residual stress) in welded structures. This paper presents a finite element procedure for the prediction of welding-induced residual stresses and distortions. Comparison is made with tow numerical example. The first example is a butt welded joint of two plates, while the second is a Cruciform welded joint of two plates with four passes. Moreover, a comparison between the Cruciform weld and the butt-weld which we can obtain the parameters of the linear fracture mechanics; stress intensity factor K and energy release rate G.

Effect of Tool Design on the Mechanical Properties of Bobbin Friction Stir Welded High-Density Polyethylene Sheets: Experimental Study

“…The aim of these tests is to evaluate weld resistance by looking at the hardness in the Nugget, TMAZ and HAZ zones and in the base material that is not affected by the process, particularly the hardness in and around the heat-affected zone. Most welding studies [37][38][39][40][41][42][43] focus on this region. The knowledge of his behavior may help us to evaluate the fragility of the weld and to determine if it has the required strength.…”

Thermal Effect of Bobbin Tool Friction Stir Welding on the Mechanical Behavior of High Density Polyethylene Sheets: Experimental Study

“…Different micro structural zones can be distinguished in a weld joint: the heat affected zone (HAZ), the fusion metal and the base metal. Various experimental and numerical techniques were developed to measure the different mechanical properties, the stress intensity factor, the J-integral, and the CTOD (Crack Tip Opening Displacement) to determine the strength of the materials welded joint [8][9][10][11]. Generally, during the shaping process of solid materials, the phenomena of plastic instability often control the appearance and performance of the finished product [12][13][14][15][16].…”