Mechanical Behavior Of M55J/Cyanate Laminate Under Irradiation And Thermal Cycling

Carbon fiber/cyanate composite material is widely used in spacecraft as an emerging high-performance structural material.The spacecrafts will be damaged by particle irradiation in the space environment during long-term service space conditions.Ionization,displacement damage,polymer matrix chemical bond breakage,and various nuclear reactions will occur in the composite.The high and low temperature environment experienced by the spacecraft during around the earth will also affect the performance of the composite material,.Thermal cycling causes the composite material to generate thermal stress due to the different thermal expansion coefficients of the reinforcement and the matrix,which in turn causes the composite material to crack.These all pose a great threat to the safety of the spacecraft's longterm service in orbit.This article takes M55J/cyanate composite laminate as the research object,the parameters of the irradiation and thermal cycle under the space service conditions obtained from the spacecraft environment.Designed and conducted simulation experiments of ground irradiation and thermal cycling,the single-irradiation,single thermal cycle and irradiation heating cycle experiments were carried out on the M55J/cyanate composite laminate respectively to study the tensile,compression and bending properties of the M55J/cyanate composite laminate before and after the experiment.It provides an important experimental basis for ensuring the safe service of spacecraft,designing and selecting of spacecraft structural materials,processing optimization,service life assessment and simulation evaluation.The research results show the tensile strength of the 0°-layed M55J/cyanate composite laminate was firstly increased and then gradually decreased with the increasing of the comprehensive environmental effect time at room temperature,the tensile strength was always higher than the original sample.The maximum increase is about 16%.The tensile strength of the 90° layered sample gradually decreased,and the maximum decrease is about 17%.The compressive strength of the 0°ply sample gradually decreased with the increasing of the comprehensive environmental effect time at room temperature,and the maximum decrease is about 19%.The changing of 90°ply sample's compressive strength was little,and the overall changing range is within 4%.While the 0°and 90°ply compression elastic modulus of the M55J/cyanate composite laminates increased with the increasing of the comprehensive environmental effect time,the maximum increase is about 17% and 20%.The bending strength and bending elastic modulus of the M55J/cyanate composite samples did not change much before and after the comprehensive environmental effects,and the comprehensive environmental effects had little effect on the bending properties of the samples.The mechanical properties of M55J/cyanate composite laminates after comprehensive environmental effects changed within 20%,which ensures the safety of M55J/cyanate composite laminates in service in space.