A Metallurgic and Mechanical Differentiation to Friction Stir Welding (FSW)

The objective of this research was to measure the material properties as well as the forces to orthodox friction stir welding (FSW) performed in air of AA6061. These results were compared by using ultimate tensile strength (UTS) and weld root properties such as joint line residue length at the crossing point between the welded aluminum alloy which allows crack initiation. Metallurgic cross sections of the AA6061 welds were prepared and the weld nugget hardness between the welding parameters was compared as well. Experiments such as this one and others enumerating the forces and process parameters must be achieved. A steady state model of temperature distribution has been put forward and is shown to precisely forecast trends in heat input using heat generation equations from [1,2]. Temperature distribution was measured and correlated to data by use of Micron Thermal Imaging camera.

Structures d'écoulement dans une caisse filonienne : le mécanisme d'intrusion télescopique et le concept d'intra-épontes

A detailed study of the internal structure of a dyke has revealed the existence of three facies, separated by magmatic discontinuities termed intrawalls. Chemical data from rocks and minerals, noteworthy for their homogeneity, point to a comagmatic identity for the different facies.Magmatic fabrics and especially intratelluric mineral distribution across the dyke width permit us to propose flow models specific for each facies. From these data it appears that, for a given facies, the flow pattern (and the consequent mechanical differentiation) must be expressed in terms of rheological characteristics of the magma during its emplacement.The data as a whole (chemical, mineralogical, structural petrology) are integrated in a dynamic emplacement model of a single magma through a pipe, according to what we define as a telescopic intrusion model.