NetComposites
Juniar Spraybooths

Sensor Film Technology Reduces Warped and Rejected Composite Parts

02 July 2008

Sensor Products has developed Pressurex, a thin sensor film that carefully maps and measures the amount of interfacial stress exerted on honeycomb cores, composite lay-ups and bonded surfaces within composite structures.

Pressurex is designed to show how surface stresses are distributed, so that an engineer can observe inconsistencies and misregistration in composite parts and thereby greatly reduce the yield defect rate. Sensor Products say that other applications for Pressurex include determination of press planarity in lamination processes, monitoring of vacuum bagging pressures, confirmation of pressure uniformity on wound filaments parts, and calibration of tools and equipment.

Pressurex comes in the form of a thin plastic sheet or roll that can be cut to required dimensions. When placed between contacting or mating surfaces, the film instantaneously and permanently changes colour. This colour change is a direct result of the amount of pressure applied. Comparison of colour variations to a colour correlation chart (conceptually similar to interpreting Litmus paper) can help determine precise pressure magnitude. Pressurex can detect pressures from 2 to 43,200 PSI (.14 to 3,037 kg/cm2). Depending on the requirements of the project, Additional evaluation and analysis can be performed with an optical analysis system (Topaq) available from Sensor Products Inc.

In the aerospace industry, Pressurex has been used to determine the exact amount of pressure causing cracks in the inner spars of a helicopter’s main rotor blade. A large sheet of Pressurex was inserted into the bonding tool, bagged up, and pressurized in the autoclave. When the film was removed, the exact amount of pressure causing the crack was determined.






Related / You might like...

Lanxess Provides Thermoplastic Solutions for Drones

The Lanxess High Performance Materials (HPM) business unit presented a drone propeller made of short glass fibre reinforced Durethan polyamide 6 at Chinaplas 2018.

Haydale Supplies Graphene for Juno UAV

Haydale has supplied graphene enhanced prepreg for Juno, a 3 m wide composite-skinned unmanned aerial vehicle (UAV), which was revealed during Futures Day at the 2018 Farnborough Air Show.

Premium Aerotec, Faurecia and Solvay Launch Thermoplastic Composites Consortium

Premium Aerotec, Faurecia Clean Mobility and Solvay have launched the research group IRG CosiMo: Composites for Sustainable Mobility, which will focus on the development of materials and process technologies to enable the high volume production of thermoplastic composites for the aerospace and automotive markets.