Details

Autor(en) / Beteiligte

• Gong, Yu
• Jiang, Linfeng
• Zhang, Hansong
• Wang, Ziming
• Hu, Ning

Titel

Temperature effects on the mode II delamination propagation behavior of aerospace-grade CFRP multidirectional laminates

Ist Teil von

• Mechanics of advanced materials and structures, 2024-05, Vol.31 (10), p.2170-2183

Ort / Verlag

Abingdon: Taylor & Francis

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Taylor & Francis

Beschreibungen/Notizen

• Composite laminates are prone to occur delamination. Currently, there is still lacking research on the temperature effect on mode II delamination of laminates, especially the multidirectional ones. Systematically experimental and numerical studies are conducted here. Delamination tests are performed at four temperatures (−50 °C, 23 °C, 80 °C and 130 °C) on aerospace-grade T800/epoxy multidirectional laminates using an end-notched flexure set-up. Pre-cracked and non pre-cracked fracture toughness, and R-curves are measured. The non pre-cracked fracture toughness is affected by temperature. Their values at −50 °C, 23 °C and 80 °C are relatively close to each other while the value at 130 °C is 34.14% lower than that at 23 °C. The pre-cracked fracture toughness exhibits negligible dependence on temperature and is significantly higher than the non pre-cracked one. R-curve phenomena are observed in specimens evaluated at different temperatures, which exhibit a good linear increase with the increase in delamination length. The R-curves measured at −50 °C∼80 °C are similar while significantly higher than that at 130 °C. In addition, the bridging stress is lower when the temperature is between −50 °C and 23 °C, compared to those at high temperatures of 80 °C and 130 °C. Numerical framework for simulating the mode II delamination growth behavior is established based on the cohesive zone model. Predicted results show that the reasonable interfacial strength of cohesive elements first increases and then decreases with the increase in temperature. Temperature effect on the damage area around crack tip is also revealed.