Details

Autor(en) / Beteiligte

• Song, Xing
• Jiang, Yun
• Hu, Xiaoan
• Nie, Xiangfan

Titel

Thermomechanical fatigue and life prediction method of a precision cast superalloy with electrical discharge machining drilled holes

Ist Teil von

• International journal of fatigue, 2023-01, Vol.166, p.107253, Article 107253

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2023

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• •TMF tests were investigated on specimens manufactured by precision casting with holes.•TMF deformational behaviors of the specimen with holes were studied.•The stress concentration at the hole led to crack nucleation and final failure.•A TMF life prediction method based on stress concentration was proposed. Thermomechanical fatigue behavior of a directional solidified superalloy was investigated. Circular holes were designed on the specimen manufactured by precision cast method. The results indicated that the TMF damage is mainly controlled by fatigue, creep and oxidation damage, and the stress concentration at the holes results in crack nucleation and final failure. A new TMF life prediction method for specimens with stress concentration is proposed. The stress gradient is introduced to consider the effect of stress concentration at hole and notch in this method, which is verified by TMF data of smooth, notched and hole specimens.