Samuel Crequy

Samuel Crequy
Ecole Nationale Supérieure d'Arts et Métiers | ENSAM · Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

PhD

About

25
Publications
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167
Citations

Publications

Publications (25)
Article
Multiple parallel scratches are often analyzed to understand the material removal mechanisms due to abrasion. However, successive scratches with different orientations may represent better the conditions found in machining processes, such as honing and belt finishing. The objective of this work was to analyze the cutting forces and the phenomena of...
Article
Metal-matrix composites with solid lubricant reinforcements may present a suitable alternative to improve the tribological behavior of sintered components. Besides the performance during the application, the presence of solid lubricants may also modify component manufacture, for example, during machining operations to achieve complex shapes not dir...
Chapter
Whole Body Vibrations: Physical and Biological Effects on the Human Body allows an understanding about the qualities and disadvantages of vibration exposure on the human body with a biomechanical and medical perspective. It offers a comprehensive range of principles, methods, techniques and tools to provide the reader with a clear knowledge of the...
Article
Full-text available
Background: Vibrations in cycling produced by road irregularities could cause health problems and affect the cyclist’s comfort and performance. Therefore researchers and manufacturers focus their efforts to reduce the vibrations. Objective: The agro materials appear to consume important properties which help in reducing the values of vibrations. Th...
Article
Full-text available
The aim of this study was to analyse the effect of forces applied to pedals and cranks on the strain imposed to an instrumented bicycle motocross (BMX) frame. Using results from a finite element analysis to determine the localisation of highest stress, eight strain gauges were located on the down tube, the seat tube and the right chain stay. Before...
Article
Various Ni-Zn-P alloy coatings were deposited onto aluminum substrates using electroless plating from a sulphate bath containing varying amounts of zinc (II) ions. Different techniques, such as scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction, were employed to characterize the morphology, composition and stru...
Article
Full-text available
The vibrations undergone by men are a well-known and widely studied risk factor in the industrial world. They are transmitted to the whole body or the upper limbs and they are measured, and limited, according to international standards. Disorders resulting from exposure to vibration are varied in nature: osteoarticular, muscular, vascular, and neur...
Conference Paper
Whole body vibration training (WBVT) is neuromuscular stimulation applied as mean of exercise and rehabilitation to improve muscle strength, bone mineral density and body balance (Rittweger, 2010). The benefits of vibration training must be considered with the potential physiological hazards associated with the exposure to vibration. Indeed, it is...
Conference Paper
In the world of cycling, the vibrations generate back (Hill et al., 2009) and hand-arm system injuries (Schwellnus et al., 2005) result from the trauma of bones, causing work disability. At the same time, perception of the pain is a source of diminution of the performance (Nelson, 2003). From these reasons, it is interesting for the bicycle industr...
Article
The aim of this study was to test the validity and the reliability of the G-Cog which is a new BMX powermeter allowing for the measurements of the acceleration on X-Y-Z axis (250 Hz) at the BMX rear wheel. These measurements allow computing lateral, angular, linear acceleration, angular, linear velocity and the distance. Mechanical measurements at...
Article
The aim of this study was to test the validity and reliability of the G-Cog which is a new BMX power meter allowing for the measurements of the power output (250 Hz) at the BMX rear wheel during actual cycling and laboratory conditions. Sprints in road cycling (6-8 s) from static start and incremental tests in the laboratory (100-400 W) have been p...
Article
Full-text available
Numerous workers are exposed to vibrations which can turn out to be fatal for the health. Athletes can be included in this population, in particular cyclists who are exposed to vibration due to the irregularity of the road. This nuisance depends of the duration of exposure and the range of vibrations. While the worker is mostly directly excited by...
Article
This paper proposes to highlight two aspects of denoising in vibration analysis. The first aspect aims to reveal the singularities, and the second eliminates the noise in order to keep the useful signal. These two aspects are the cause of the surjection of denoising, especially due to the choice of the performance criteria. This paper highlights th...
Article
The aim of this study was to describe and validate a new cycling ergometer with original characteristics that allow the measurement of biomechanical variables with position and crank inertial load used by the cyclist in field condition. The braking pedalling force, that permitted the simulation of the resistance to the cyclist in the field, is perf...
Article
Hot forging tools are exposed to severe thermo-mechanical load which cause their failure. The main failure mechanisms are mechanical fatigue, thermal fatigue, plastic deformation and abrasive wear. The use of hardfacing is an effective solution to increase tool life and consequently reducing the cost of forged part. In this work the use of a cobalt...
Article
Nowadays, high quality product becomes more and more required. Particulates reinforced composites have been established as competitive materials for naval, automotive and aerospace manufactory. However, the fatigue behaviour of such materials is so complex and diverse that much more investigations still required for completing knowledge in these fi...

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