Franck Girot Mata

• Chair at University of the Basque Country

Low alloyed martensitic resistant steels could become a solution for material saving and components lightweighting in the industrial activity due to the combination of high strength and good weldability and toughness characteristics. However, it is known that martensitic resistant steels are susceptible to temper embrittlement (TE), which can cause...

A comparative study is presented, focusing on three different bioinspired design methodologies applied to a large-scale aeronautical tooling use case. The study aims to optimize the structure in terms of the first vibration mode, minimizing mass, and supporting operational loads. The development of lightweight metallic components is of great import...

Machining CMCs under productivity conditions while limiting tool wear and material damage is a challenge for applications such as jet aircraft engines and industrial turbines. This contribution focused on developing a method to characterize the wear of abrasive tools based on fractal dimensions. This solution allows characterization of the state of...

The application of new forming processes as the high temperature hot forging in closed dies in an industrial environment still requires further investigation due to the lack of flow stress data at these temperatures. To determine the flow behavior of the 42CrMo4 steel at high temperatures hot compression tests have been carried out in a Gleeble® 38...

Riveting is the most important method for joining two sheets of different materials. In order to promote electromagnetic pulse riveting (EMR), the influence of the impact velocity will be studied in this paper in order to correctly model the electromagnetic field of the riveting process. There are many parameters associated to the riveting process,...

It is known that natural designs are more efficient and functionality-aimed than human designs. Historically, human beings have tried to mimic the way nature designs or the natural designs themselves. However, it turned out that it was usually too complex for the technology of the time. Today there exists the opportunity to mimic most natural desig...

The use of secondary aluminum alloys in industry is still limited by the high Fe contents in recycled alloys. In general, the Fe-rich intermetallic compounds deteriorate the performance of secondary Al-Si alloys, specially the β-Fe phase. To mitigate the detrimental effects of iron, the influence of diferent cooling rates and holding temperatures o...

Metal additive manufacturing technologies are gaining great interest. However, the existing metallic alloys are generally formulated for conventional manufacturing processes. Thus, it is necessary to adapt their chemical composition or develop new alloys for the manufacturing conditions of additive manufacturing processes. The main method for manuf...

Background Many traditional experimental testing devices like hydraulic testing machines, Split Hopkinson bar technique, etc. are available to recreate the same material behaviour that occue during manufacturing processes at different strain rates. But the fact is that a state of large equivalent strain with dominant shear strain at intermediate st...

In recent years, many researchers have attempted to model the solidification process of nano-reinforced materials. In the present document, the effect on the heterogeneous solidification regime of the different sizes, shapes, and chemical compositions of nanometric ceramic particles in an AlSi10MnMg alloy is studied. This article develops a mathema...

Good quality manufacturing operation simulations are essential to obtain reliable numerical predictions of the processes. In many cases, it is possible to observe that the deformation localizes in narrow areas, and since the primary deformation mode is under shear, these areas are called shear bands. In classical continuum mechanics models, the def...

The experimental characterization of the material under shear loading is essential for researchers to study the plastic behavior of materials during manufacturing processes. Indeed, regardless of the loading mode, ductile materials mainly deform plastically under shear loading. Thus, for such material behavior analysis, shear tests are very useful....

A model is proposed to predict the solidification microstructure (columnar or equiaxed) of a nickel alloy (Inconel 178) during the laser cladding process. The model is constituted of two parts. The first part allows modeling of the laser cladding process in order to be able to define the temperature gradient in the melt and its solidification veloc...

During most metal manufacturing processes, the medium deforms by generating large quantities of plastic strain at relatively high strain rates, inevitably inducing rises in temperature. Metals characterized by low thermal conductivity properties might locally retain high temperatures, consequently undergoing thermal softening. The classical balance...

Predicting the performances of a manufactured part is extremely important, especially for industries in which there is almost no room for uncertainties, such as aeronautical or automotive. Simulations performed by means of numerical methods such as Finite Element Methods represent a powerful instrument in achieving high level of predictability. How...

Wire Arc Additive Manufacturing (WAAM) is one of the most appropriate additive manufacturing techniques for producing large-scale metal components with a high deposition rate and low cost. Recently, the manufacture of nickel-based alloy (IN718) using WAAM technology has received increased attention due to its wide application in industry. However,...

Materials undergo various loading conditions during different manufacturing processes, including varying strain rates and temperatures. Research has shown that the deformation of metals and alloys during manufacturing processes such as metal forming, machining, and friction stir welding (FSW), can reach a strain rate ranging from 10⁻¹ to 10⁶ s⁻¹. H...

Nowadays, improvement of the surface finish of parts manufactured by fused deposition modelling is a well-studied topic. Chemical post-treatments have proven to be the best technique in terms of time consumption and smoothness improvement. However, these treatments modify the structure of the material and, consequently, its mechanical properties. T...

The use of composite materials with a polymeric matrix, concretely carbon fiber reinforced polymer, is undergoing further development owing to the maturity reached by the forming processes and their excellent relationship in terms of specific properties. This means that they can be implemented more easily in different industrial sectors at a lower...

Purpose This paper aims to study the interfacial and interlayer bonding of Polylactic acid parts manufactured by fused deposition modelling. Different layer thicknesses are analysed in the manufacture of these pieces and the lack of material associated with this parameter is verified. The influence of the immersion of these parts in different solve...

The present contribution on tool wear during the drilling of carbon fiber composite materials (CFRP)/Ti stacks intends to determine (i) if the adhesion of titanium to carbide is mechanical or chemical, (ii) the possible diffusion path, (iii) if the titanium is the only element involved in the adhesion and (iv) the role of the CFRP in this wear. The...

At present, Additive Manufacturing (AM) with post-processing tasks combination is an interesting as well as a necessary procedure in many industrial areas that work with polymeric components. However, there are not enough studies related to finishing treatments on AM parts. This contribution analyses different post-treatments in order to achieve im...

Hot deformation behavior of the Ti-6Al-4V alloy is studied through hot torsion tests. Cylindrical samples are twisted at different strain rates and temperatures in the β phase domain. The recorded torque vs twisting angle data are converted to strain vs stress data using the appropriate methods. All the flow curves obtained are characteristic of co...

This paper is focused on the genesis of microstructures in friction stir welding (FSW) of the Ti-6Al-4V alloy. Several titanium joints, initially prepared with four different preheat treatments, were processed by FSW. Detailed microstructural analyses were performed in order to investigate change in the microstructure during the process. In this wo...

The components made of composite and hybrid materials such as composite- titanium laminates are increasing in the aerospace sector. Among the different machining processes, drilling is especially relevant due to the high number of operations that have to be performed and the consequences of the damages that can be originated in the workpiece. Thus,...

Cost reduction and product quality are the main objectives of companies in order to be capable of expanding to new markets. Nowadays, environmental laws are more severe due to the increasing pollution problems. In this way, companies should deal with their main objectives of cost reduction and also with the idea of a green image, sustainability and...

Cost reduction and product quality are the main objectives of companies in order to be capable of expanding to new markets. Nowadays, environmental laws are more severe due to the increasing pollution problems. In this way, companies should deal with their main objectives of cost reduction and also with the idea of a green image, sustainability and...