JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 45

FEATURE “Marine” g…/… Development of operational monitoring sensors for the Veolia racing monohull Blue = front sensor (2 meters from the stem of the boat) Red = rear sensor (4 meters from the stem of the boat) Signal: Wave - contact period: 2,5 sec. Maximum level of deformation:?= 5.10-5 Maximum rate of deformation: d?/dt= 118%/s the impact is received at first at the front sensor but the maximum level is recorded on the rear the boat stem is out of the water and falls down to the bottom of the following wave the boat goes through a small wave and the front sensor shows scatterd variations. Fig. 5: Shear strain peaks from two sensors during sailing The shear strain values are relative to the zero of the data channels used in the measurements carried out on land. The load level remains negligible in relation to the foam’s maximum shear stress. However, nothing indicates that the sensors were where the greatest shear deformation occurred. The boat entering into contact with the waves produces shear strain peaks with a period of about 2.5 seconds. The waves have different shapes, which causes random maximum deformation peaks as shown by the readings below (Fig.5): The measurements also serve to locate the impact zones. In Figure a, the front sensor undergoes peak load before the rear sensor does. In Figure b, the opposite is true, and the load is lower than in scenario a. In Figure c, the type of stressing corresponds to a local impact in the bow, eliciting a random response from the sensors. The level of peak deformation is low during this measuring period, although the shear strain rate is 118 %/s. These results indicate that the mechanical characterization of the core materials used for structures of this kind should be done at high speed, whereas currently, only quasi-static tests are conducted. Conclusion The measurements at sea provided crucial information that served to make the boat more reliable and refine its settings. The information also suggests that a next step for future projects would be a characterization of the materials that is consistent with the strain rates encountered during sailing. Based on the results obtained and the analysis of them, the objective is now to instrument the boat in order to sail in the correct stress range, i.e. measure the main stress flows in order to be able to adapt sailing manoeuvres to limit extreme loads on the structure in dynamic and fatigue conditions. More information: http://www.canyousea.com http://www.univ-nantes.fr No35 September 2007 / JEC Composites Magazine

http://www.canyousea.com http://www.univ-nantes.fr http://www.diatex.com

JEC COMPOSITES MAGAZINE - Issue #35 - September 2007

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #35 - September 2007

Edito
CONTENTS
NEWS WORLDWIDE
- Companies
- Agenda of events
- 2008 JEC Singapore
BUSINESS
- Market survey
- Niche markets
- Trends
- Human capital
FEATURE - MARINE
- Market
- Raw Materials
- Process
- Application
USERS’ PLATFORM
- Composites in the world
- Successful partners
- Applications
KNOW-HOW
- Warp knitting technology
- Testing
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 1
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 2
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - Edito
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 4
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 5
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - CONTENTS
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 7
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Companies
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 9
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Agenda of events
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 11
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - 2008 JEC Singapore
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 13
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 14
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 15
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Market survey
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 17
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 18
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 19
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 20
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 21
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 22
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 23
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Niche markets
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 25
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Trends
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 27
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 28
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 29
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Human capital
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 31
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Market
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 33
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Raw Materials
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 35
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 36
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 37
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 38
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 39
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Process
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 41
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 42
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 43
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 44
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 45
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 46
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 47
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Application
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 49
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Composites in the world
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Successful partners
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 52
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 53
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 54
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 55
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 56
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 57
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Warp knitting technology
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 59
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 60
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 61
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 62
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Testing
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 64
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 65
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 66
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 67
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 68
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