CEEES Meeting London September 2006 Practical Experiences in Climatic Testing Eduard Pohle ofi-research Institute for Chemistry and Technology Arsenal Object 213, A 1030 Vienna, Austria
A small presentation... Main site 1030 Vienna, Arsenal Object 213 Site Life science 1110 Vienna Brehmstraße 14A
A small presentation... Private Testing- & Research Institute Legal Form: Association (since 1946) app. 135 employees (as at 08/2006) Accredited Testing- and Inspection Body according to EN ISO/IEC 17 025 resp. EN ISO/IEC 17020 (type A)
Table of Contents Introduction Climate stability for aircraft equipment Ageing behaviour of automotive parts Ageing behaviour of motorcycle coverings Ageing of electro luminescent foils
Introduction Influences on products: Climate (temperature / humidity / rain) Radiation Chemical influences Tribological influences Tests are ordered by the customer
Table of Contents Introduction Climate stability of aircraft equipment Ageing behaviour of automotive parts Ageing behaviour of motorcycle coverings Ageing of electro luminescent foils
Aircraft Products Requirements on interior equipment Change of climate Quick change of climate (2,5 K/min) Limits +80 C/85% r.h.; -55 C
Aircraft Products Requirements on interior equipment High temperature stability Quick change in steps of 10 C Temperature limit +170 C
Aircraft Products Effects of high temperature stability tests
Interior equipment Aircraft Products
Table of Contents Introduction Climate stability for aircraft equipment Ageing behaviour of automotive parts Ageing behaviour of motorcycle coverings Ageing of electro luminescent foils
Automotive parts Exterior parts Leak tightness of a screw connection Spray irrigation on a spoiler Assessment of penetration
Automotive parts Exterior parts Cover sheet Climatic cycle tests +90 C -40 C Deformation Change in colour
Automotive parts Exterior parts Cover sheet Climatic cycle tests +80 C -30 C Small deformation Delamination of layers
Table of Contents Introduction Climate stability for aircraft equipment Ageing behaviour of automotive parts Ageing behaviour of motorcycle coverings Ageing of electro luminescent foils
Motorcycle coverings Climate cycles Limits +60 C/50%r.h.; -20 C No visible change in colour, blisters or cracks Loss of adhesion
Motorcycle coverings Climate cycles Condensated Water +40 C - change to room temperature Without cold cycles
Motorcycle coverings Effects of UV-radiation Radiation: UVA 340 fluorescent lamps Time: 1200 hours Change in colour Change in adhesion of the labels Change of stone chip resistance
Motorcycle coverings Device with fluorescent lamps
Motorcycle coverings Stone chip resistance
Table of Contents Introduction Climate stability for aircraft equipment Ageing behaviour of automotive parts Ageing behaviour of motorcycle coverings Ageing of electro luminescent foils
Electro luminescent foils General aspects on life time prediction simulation of ageing at a higher rate, e.g. higher temperature, accelerated weathering defined criteria for the end of life necessary methods for calculation e.g. according to the law of Arrhenius exact prediction is impossible, the results only allow a rough estimation e.g. months or years
Electro luminescent foils Characteristics and requirements End of life (EOL-)criteria: Limits for light density (50% decrease compared to new foils) Limits for power uptake (50% decrease compared to new foils) Test of ageing rate at different temperatures
Electro luminescent foils Test conditions Controlled climates: temperatures: +40 C, +60 C and +80 C humidity: 65% Power settings: - 110 V/400 Hz - 135 V/650 Hz Measurement: light density and power uptake at different times
Electro luminescent foils Calculation following EN 60216-1 (Electrical insulating materials thermal endurance properties) Light density [%] 11 10 0 09 80 7 0 60 50 40 30 20 10 0 0 0 16 8 33 6 Light density 80 C/65% r.h. 50 4 Time [h] 67 2 110 V 135 V 84 0 100 8 117 6 134 4
Electro luminescent foils Results: extrapolation of life time at +20 C according to the law of Arrhenius EOL according to light density: - 110 V/400 Hz: ~ 15 years - 135 V/650 Hz : ~ 7 years 10 Extrapolation light density at 135 V log time [h] 4,79 ( ~ 7 years) y = 2890,7x 5,069 0 20 C 0,002 0,0034 0,0048 1/t [K -1 ]
Electro luminescent foils EOL according to power uptake: 110 V/400 Hz: ~ 2 years 135 V/650 Hz: ~ 1,3 years log time [h] Extrapolation power uptake at 135 V 10 9 8 7 6 y = 934,84x + 0,855 5 4,04 (~ 1,3 years) 4 3 2 1 20 C 0 0,002 0,0034 0,0048 1/t [K -1 ]
Summary Main points Climatic tests are an expressive method to show effects which will occur during the life time of a product Depending on the requirements, different tests have to be carried out for life time prediction The simulation of environmental conditions will be the challenge for the next years
THANK YOU for your attention! Eduard Pohle Tel: +43 (0) 1 79 81 601 670 Email: eduard.pohle@ofi.co.at