JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 45

By

NDT

Shearography: an optical testing method for the

non-destructive inspection of composite materials
Many of today’s high-tech products are made of composite materials which are specifically designed for their targeted applications. In addition to a specialised knowledge of the characteristics of these materials – which are often anisotropic – quality control is a priority. As these components contribute to safety, especially in the aerospace, aircraft, or boating industries, and are of great economic value, defects must be rapidly identified during both production and maintenance phases.

EBERHARD MOSER, INTERNATIONAL SALES MANAGER THOMAS WALZ, MANAGING DIRECTOR DANTEC DYNAMICS GMBH

S

hearography is a full field inspection technique specifically suited to the rapid detection of defects. It is widely accepted as a reliable inspection method especially designed for modern composite materials. This paper describes the latest generation of shearography techniques and software and outlines their potential. Shearography is a widely-recognised optical measurement technology that provides fast and accurate information about defects inside a wide range of composite materials. Using this technique, it is now possible to detect delaminations, disbonds, undulations, kissing bonds, crushed cores and many other types of defects without any surface preparation. In principle, the technique involves comparing two images of the same surface under two different load conditions. The load is applied to the object surface using either thermal,

vacuum, vibration or mechanical excitation. This creates a surface deformation linked to the material’s physical response to the load condition. Local reactions show a different behaviour and are thus recognized as anomalies when compared. The results are available in real-time and are automatically displayed to the operator. Further processing of saved image files can be performed to customise the results for export and reporting (Figure 1). Therefore, shearography offers a high potential for reducing inspection time, especially on large surfaces.

Portable inspection systems

In many cases, such as the maintenance or assembly of aeroplanes, the inspection system needs to be transported to the inspection site. For such purposes, a portable

No65 May –June 2011 / jec composites magazine
Fig. 1: Defect shown by shearography

shearography inspection system has been successfully developed and used in the field. This system is presented in Figure 3. It consists of a portable vacuum hood that applies suction directly to the surface to be inspected. Inside the hood, a shearography camera records any deformation of the component's surface when different pressures are

45

Feature aeronautics



JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011

Cover
Edito
Point of view: Reducing the gap between carbon and glass
Contents
Agenda of Events
COMPANY & BUSINESS
- In Brief
- Glass fibre
APPLICATIONS
- Sports and leisure
- Civil engineering
- Water filtration
MARKET
- Human ressources
- Focus: Carbon
- Business trends
- Sustainability
FEATURE AERONAUTICS
- Automation
- RTM
- Thermoplastic
- Productivity
- Software
- NDT
- Companies
RESEARCH & DEVELOPMENT
- Nanotechnology
- Filament winding
TECHNOLOGY & INNOVATIONS
- SMC
- D-SMC
- Thermoplastic
- Innovations
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - Cover
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 2
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - Edito
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - Point of view: Reducing the gap between carbon and glass
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 5
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - Contents
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 7
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - In Brief
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Glass fibre
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 11
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Sports and leisure
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Civil engineering
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Water filtration
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Human ressources
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 16
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 17
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Focus: Carbon
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 19
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 20
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 21
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Business trends
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 23
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Sustainability
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 25
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 26
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 27
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 28
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 29
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Automation
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 31
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - RTM
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 33
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Thermoplastic
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Productivity
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 36
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 37
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Software
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 39
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 40
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 41
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 42
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 43
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 44
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - NDT
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 46
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Companies
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 48
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Nanotechnology
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 50
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 51
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Filament winding
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 53
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 54
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 55
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - SMC
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 57
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 58
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - D-SMC
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Thermoplastic
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 61
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 62
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 63
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - - Innovations
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - Index
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - In the world
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 67
JEC COMPOSITES MAGAZINE - Issue #65 - May/June 2011 - 68
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