S. Ansari, E. Ranjbarnodeh, M. Iranmanesh,
Volume 2, Issue 2 (11-2016)
Abstract
Studies on welding process of Aluminium weldments shows that post-weld residual stress and deformation are influential on structure efficiency and there are different variable which affect these stresses and deformation. In this study the effect of geometrical variables and welding sequence on residual stresses and deformation in Aluminium H321 have investigated by the finite element software Ansys. Thermo elastic-plastic model was verified by metallography experiment and measurement of post-weld deformation afterward, weld leg, penetration depth and welding sequence were optimized to minimize the distortion. It was concluded that weld-volume increase post-weld distortion and it can be minimize by choosing an appropriate weld sequence
A. Kesharvarz, E. Ranjbarnodeh, M. Fadavie-Ardestani, M. Saeed Kiasat,
Volume 3, Issue 1 (8-2017)
Abstract
Nowdays, the prediction and prevention of fatigue failures is converted to one of the most concerns for industry owners. Since the processes of fatigue suddenly occur, it is most important and necessary to recognize the effective factors of fatigue life of structures. Mechanical and thermal multiple loading are the important factors of the fatigue failure. In order to appropriate fatigue design, analysis should be validated with experimental results. In present research, fatigue life of A36 welded steel samples obtained from test is compared by finite element results obtained from commercial ansys pakage. In this research, the effects of residual stress, reinforcement, notch and thickness of sampels on fatigue life are studied. Results of analytical simulation and experimental show good agreement. Results also shows the dominant effect of reinforcement on the fatigue life.
H. Tirband, D. Akbari, M. Sadeh,
Volume 8, Issue 1 (8-2022)
Abstract
Todays, application of composite materials has been increased in various industries due to their special strength properties and also other unique features. One of the important things during making of such materials, is their connection to each other. In this article, the Joining of heat-hardened parts with surface preparation with the help of laser, simple and rough, has been investigated. The main goal is to investigate the better surface adhesion mechanisms of the connection compared to the simple surface, as well as to create practical approaches to increase the adhesion strength of the thermosetting parts. The composites were made of heat-hardened epoxy resin (which hardens after 12 hours at room temperature) and two-dimensional woven glass fibers and were connected by glue after volume heating at a temperature of 180-200 degree Celsius. In this research, the overlapping surface of the part was engraved by laser in circular patterns. The raw parts were prepared by manual polishing and mechanical abrasion. The results show that by examining the effect of surface roughness and composite thickness, the highest value of shear strength is related to the surface roughness compared to other preparation methods. Surface preparation increases the amount of adhesive penetration in the parts and expands the tensile strength. The thickness also has a conditional effect on the strength of the connection.
