JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 25

ski to resist the abrasion of ice and snow and the scratching of stones; its yield strength contributes N. P. : The introduction of glass to the ski's resistance to the fibre, in the 1960s, offered major high levels of deformation, improvements in the strength and while the honing of the durability of skis. Skis are subject edges allows the ski to bite to high degrees of deformation, into the snow. and therefore require materials - Above the base there is a with high yield strength. composite layer with glass Our structures are heterogeneous fibre/epoxy reinforcement; beams, combining wooden, foam this laminate is the ideal or honeycomb cores with composite material (more composite reinforcements (glass, commonly used than basalt, carbon or aramid fibre carbon fibre) for fabrics) and aluminium alloys. addressing the problem of These high-performance extreme mechanical composite materials make it deformation that the ski possible, on the one hand, to undergoes during use. design equipment offering the - We make extensive use of user better sensations and laminated wood as a comfort and, on the other, to material in our cores, since meet the extremely severe it is an excellent natural durability requirements composite (cellulose (minimum temperatures of microfibres, lignin matrix). 30°C, ice, speed, carving stresses, The glued-laminated etc.). The development of our technique makes high-performance skis therefore it possible to stabilise the integrates all the design variations in mechanical parameters associated with characteristics and composite reinforcements orientate the fibres in order (orientation, areal weight, and to improve performance type of fibres). levels. The polyurethane foam cores provide benefits
JCM: Why is there an increasing use of composites? What parts will never be made out of composites? JCM: A ski may be considered as a kind of complex beam. What are its constituent elements and what types of material are used for each of these elements?

in terms of lightness and 3D forming using the injection process. - Aluminium alloy reinforcements are associated with the glassepoxy reinforcements in order to constitute "fibrometal" structures. These alloys are included in the composition of our skis for their isotropic characteristics and their good vibration behaviour. - Next come the lateral transmission zones: these are the sidewalls, which may be made of ABS or phenolic materials. - Lastly there is the decorative thermoplastic layer that also plays a protective role (impacts and scratches, UV resistance, etc.), and which in the present case is a bilayer of ABS and polyurethane (ABS+TPU).

Thermoplastics = 26% Wood = 16% Steel and alloys = 30% Thermosets = 10% Fibres = 18%
JCM: What is the role of carbon and, now, of natural fibres?

N. P. : A ski may indeed be described as a heterogeneous beam, consisting of a glued assembly of up to a dozen different types of layer: - Base: the part that is in contact with the snow, this is made of high-density polyethylene (HDPE), also designated ultra-highmolecular-weight polyethylene (UHMWPE). - Steel edges: the hardness of this material allows the

Fig.1 : Main components for a complex heterogeneous beam ROSSITOP ABS+TPU GLass/epoxy reinforcement XC75 steel edge

N. P. : For our composite applications, carbon fibre is mainly used in cross-country skis. These products are not subjected to the same vibration and deformation conditions as alpine skis, and our technical requirements therefore differ greatly between these two families of products. The specific modulus of the reinforcements is optimised by means of carbon fibre in order to reconcile rigidity distribution, responsiveness and extremely low weight. The moulding also incorporates a Nomex core, and can be used to produce a skate ski (X-ium) that currently weighs just 500 g Fig.2(a). A lot of work has been done in recent years on touring skis by the As a rough guide, since the Dynastar brand, to benefit from compositions vary greatly an extremely lightweight structure according to the models and levels across the ranges, here is the that needs to resist stress and average weight distribution for a impact akin to those encountered by alpine skis. Here again, the use top-of-the-range ski, for each of carbon fibre and the machining family of materials:
No64 April 2011 / jec composites magazine

Aluminium alloy reinforcement ABS or phenologic sidewall

GLass/epoxy reinforcement Wooden of PU foam core

HDPE base

25

Market



JEC COMPOSITES MAGAZINE - Issue #64 - April 2011

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #64 - April 2011

Cover
Edito
Point of view: fast expansion
Contents
Agenda of Events
COMPANY & BUSINESS
In Brief
Reinforcement - Red Composites: a real expertise in carbon fibre
Housing - Housetec: a young company with a background of 40 years’ experience
Asia - Hua Dong Fibreglass, an SME that exports worldwide
APPLICATIONS
Construction - Creative eye-catching design for a new Sheraton hotel
Marine - Multiplast builds the Groupama V070
Awards - ICERP-JEC Innovation Awards Programme 2011: eight companies rewarded
MARKET
Human capital - Latest appointments
Sports and Leisure - Rossignol Group: innovation and performance in winter skis applications
FEATURE WIND ENERGY
Reinforcement - WebCore Technologies: great ambitions in the wind industry
New rovings for wind turbine blade applications
Prepreg spar caps: a solution for today
Software - Industrial software for manufacturing large components such as wind blades
Leveraging an end-to-end solution for composite wind turbine blades
Laser placement - Manufacturing rotor blades with highest precision while reducing costs
Automation - A fully-automated manufacturing process for wind blades
Maintenance - An innovative, certified blade repair system
RESEARCH & DEVELOPMENT
Testing - Using nano-scratch testing to detec composite failure
Mould - Processing technology for the rapid production of advanced composites
TECHNOLOGY & INNOVATIONS
Robot - Robotic fibre placement machine helps reduce energy consumption
Process - A new industrialized construction process for transport infrastructures
Fibre placement - Tape laying and fibre palcement: complementary solutions
NDT - What’s new in non-destructive testing labs?
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Cover
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 2
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Edito
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Point of view: fast expansion
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 5
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Contents
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 7
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - In Brief
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Reinforcement - Red Composites: a real expertise in carbon fibre
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Housing - Housetec: a young company with a background of 40 years’ experience
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Asia - Hua Dong Fibreglass, an SME that exports worldwide
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 13
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Construction - Creative eye-catching design for a new Sheraton hotel
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 15
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Marine - Multiplast builds the Groupama V070
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 17
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Awards - ICERP-JEC Innovation Awards Programme 2011: eight companies rewarded
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 19
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 20
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 21
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 22
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Human capital - Latest appointments
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Sports and Leisure - Rossignol Group: innovation and performance in winter skis applications
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 25
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 26
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 27
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Reinforcement - WebCore Technologies: great ambitions in the wind industry
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 29
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - New rovings for wind turbine blade applications
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Prepreg spar caps: a solution for today
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Software - Industrial software for manufacturing large components such as wind blades
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 33
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Leveraging an end-to-end solution for composite wind turbine blades
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 35
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 36
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 37
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Laser placement - Manufacturing rotor blades with highest precision while reducing costs
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 39
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Automation - A fully-automated manufacturing process for wind blades
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 41
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Maintenance - An innovative, certified blade repair system
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 43
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 44
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Testing - Using nano-scratch testing to detec composite failure
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 46
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 47
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 48
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Mould - Processing technology for the rapid production of advanced composites
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 50
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 51
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 52
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Robot - Robotic fibre placement machine helps reduce energy consumption
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Process - A new industrialized construction process for transport infrastructures
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 55
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - Fibre placement - Tape laying and fibre palcement: complementary solutions
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 57
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - NDT - What’s new in non-destructive testing labs?
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 59
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 60
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 61
JEC COMPOSITES MAGAZINE - Issue #64 - April 2011 - 62
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