Metal forming processes, compared with machining ones, reduce production steps and increase manufacturing speed in addition to saving raw material. In this paper, forming process of column of a steering mechanism is investigated by finite element analyses and experimental tests; and optimum die design parameters are found. Forming process parameters including die opening angle, bearing length, ...

a 62-yr-old woman with a history of papillary carcinoma of thyroid who had undergone thyroidectomy and tracheostomy 5 years prior to admission, presented with bleeding from the site of tracheostomy. attempts to control the bleeding failed, and the patient was immediately transported to the operating room. awake intubation was performed and the endotracheal tube was sutured to the skin. a tear i...

natural convection heat transfer from a tube bundle in the indirect water bath heaters is investigated. a computer-code is used for the solution of the governing equations of mass, momentum and energy transfer based on the simple-c algorithm. simulations are carried out for the gas pressure station heater of kermanshah city with various tube bundle arrangements. in order to validate the numeric...

Determination of the optimum loading path (internal pressure- axial feeding) to restrict the Bursting, buckling and wrinkling through tube hydroforming process is necessary to produce an acceptable tube. In this paper, the wrinkling and fracture criteria are implemented to an finite element code devoted to the simulation of tube hydroforming processes. Using the ANSYS parametric design language...

introduction: tube thoracostomy complications depend on the operator’s skill, patients’ general condition and the place in which the procedure is done. the present study aimed to compare the quality and complications of tube thoracostomy carried out by emergency medicine residents (emrs) and surgery residents (srs). methods: this cohort study was conducted on 18-60 years old trauma patients in ...

Tube hydroforming (THF) process is used to produce the complex components from the initial cylindrical tubes. In this paper, T- shape component was formed using a tube hydroforming machine and the residual stresses of hydroformed tube was determined by hole drilling method. Subsequently, the thickness distribution and residual stresses of final tube were investigated using experimental and fini...