Thermo-mechanical behaviors of 2.5D shallow straight-link-shaped woven composites under the warp direction fatigue loading at room and elevated temperatures.

• Warp direction fatigue behaviors of 2.5DSSWCs at various temperatures were investigated. • Fracture morphologies of 2.5DSSWCs at various temperatures were analyzed. • Probable temperature-dependent fatigue damage mechanisms were studied. • Temperature-dependent fatigue life prediction model of 2.5DSSWCs was proposed. • Fatigue lives and damage propagation processes at different temperatures were predicted. When woven composites are used in aeroengine components, it is possible for them to experience high-temperature fatigue loads in service. 2.5D shallow straight-link-shaped woven composites (2.5DSSWCs) are increasingly replacing metal materials in the aeroengine field owing to their excellent fatigue resistance. In this work, warp direction fatigue behaviors of 2.5DSSWCs were experimentally and numerically investigated at 20 °C and 180 °C for the first time. Results show that when temperature is less than 180 °C, the thermo-mechanical properties of 2.5DSSWCs decline with the increase of temperature. However, the strength at 240 °C is totally consistent with that at 180 °C, indicating that the fiber architecture has an important effect on mechanical properties at high temperature. The average fatigue life almost experiences a linear decrease trend with the increase of fatigue load at 180 °C. A fiber-dominated fatigue failure mode without necking phenomenon was observed at 180 °C. Additionally, a temperature-dependent fatigue life prediction model was proposed to predict fatigue behaviors of 2.5DSSWCs at 20 °C and 180 °C. The fatigue failure mechanism was revealed based on test and simulation. Finally, the effects of temperature and warp arranged density on the thermo-mechanical properties were discussed. [ABSTRACT FROM AUTHOR]