The present work focuses on the thermomechanical behavior of carbon fibers woven‐ply polyphenylene sulfide (PPS thermoplastic)‐based composite materials subjected to the combined action of a tensile mechanical loading and one‐side heat flux (40‐60 kW/m²) representative of fire exposure. An experimental bench was specifically designed to provide an insight in the coupling between a medium heat flux thermal aggression and a tensile mechanical loading (either in monotonic or creep mode) within quasi‐isotropic C/PPS laminates. When subjected to a monotonic tensile loading, a 50% increase in the heat flux lead to a 50% increase of the temperature at the exposed surface resulting in a 10% decrease in the maximum load borne by the laminates. When subjected to a creep loading at 60 kW/m² (worst case scenario with the cone calorimeter), by dividing by 2.6 the applied creep stress (from 31% to 12% of the ultimate strength ), it results in a time‐to‐failure multiplied by 2.5. The temperature distribution on the exposed and back surfaces are measured to evaluate the influence of PPS matrix melting, pyrolysis, and fibers oxidation on the stress redistribution within the laminates plies.

中文翻译：

---

碳纤维编织增强热塑性层压板中热机械耦合的研究：辐射热通量下的拉伸行为

本工作着重于碳纤维机织聚苯硫醚（PPS热塑性塑料）基复合材料在拉伸机械载荷和单侧热通量（40-60 kW / m ²）共同作用下的热机械性能火灾暴露。专门设计了一个实验台，以洞悉准各向同性C / PPS层压板中中等热通量热侵害与拉伸机械载荷（以单调或蠕变模式）之间的耦合。当承受单调拉伸载荷时，热通量增加50％，导致暴露表面温度升高50％，导致层压板承受的最大载荷降低10％。承受60 kW / m ²的蠕变载荷时（使用锥形量热仪的最坏情况），通过将所施加的蠕变应力除以2.6（从极限强度的31％到12％），可以将失效时间乘以2.5。测量暴露表面和背面上的温度分布，以评估PPS基质熔化，热解和纤维氧化对层压板中应力重新分布的影响。