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Abstract
The various parts used in the manufacture of automotives involve a range of different materials. There is now greater emphasis on vehicle safety and, in order to improve this, it is necessary to increase impact absorption capability. Recent research has focused on the suitability of carbon fibre reinforced plastic (CFRP) because of its strength and light weight. It has many advantages but there are also some disadvantages. The performance of CFRP is poor in a hygrothermal environment. Giving CFRP circular members on constant temperature and humidity hinders any impact on the number of interfaces being checked. Specimens for each condition are compared based on change of energy absorption and water absorption rate. We have carried out a static collapse experiment to study the difference of energy absorption and impact modes.