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The usage of actual reinforced thermoplastic composites for structural aircraft applications is very limited because materials with higher mechanical and physical properties are needed. In the recent years, aircraft manufacturers have requirements for new continuous fibre reinforced thermoplastic composites with a significant improved performance/costs ratio for new, structural aircraft applications. That is why a new affordable reinforced composite with a poly(phenylene sulphide sulphone) (PPSS) matrix, presenting high mechanical and thermal resistance properties, is introduced in this paper. Mechanical characterisations have been performed and microscopy analyses have also been achieved to control the internal structure of the composite. It was found that PPSS reinforced material has high mechanical and thermal properties, but low chemical resistance.

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The paper ?resents an analytical study of a single-and double-hole composite bolted joint. Single-hole results are correlated with t e s t data to validate the analysis model.The study was extended t o double-hole geometry t o determine which type of joint configuration and load proportion provided che highest joint capacity. Analysis is based on the finite-element method coupled with a characteristic curve concept and a failure c r i t e r i a .Results for the single-hole validation study indicate that for the specific laminate and geometry studied, nonlinear shear modulus modelling provides a better correlation to data. The double-hole configuration results indicate that a staggered layout pattern provides a higher joint capacity compared to a series eonfiguration. The analysis indicaced a 38/62 percent bolt load distribution at the maximum joint load for the parricular joint geometry studied.The stress analysis results are shown as contour plots for the different double-hole configurations.