A Structural Analysis Approach to Burst Failure Assessment in Ti-6Al-4V Jet Engine Discs

Öz

The jet engine discs operate under extreme mechanical and thermal loads, and their design is governed by stringent regulations. Full-scale overspeed burst tests are costly and time-consuming, hence high-fidelity structural analysis is expected to predict burst behavior with sufficient accuracy. However, conducting a series of coupon tests to calibrate and validate the material model is still required. In this study, the material model was validated using test coupons, and the overspeed condition of the jet engine disc was modeled. Furthermore, the effect of different material models was investigated during the modeling phase. The test and analysis results reveal that stress triaxiality provide clear insight into the burst-failure mechanism and reduce the costs of serial testing.

Anahtar Kelimeler

• ti-6al-4v
• plasticity
• fracture
• burst
• critical plastic strain

Ti-6Al-4V Jet Motor Disklerinde Patlama Hasarı için Yapısal Analiz Yaklaşımı

Öz

Jet motor diskleri, aşırı mekanik ve termal yükler altında çalışmakta olup tasarımları sıkı yönetmeliklere tabidir. Tam ölçekli aşırı hız patlama testleri maliyetli ve zaman alıcı olduğundan, patlama davranışının yeterli doğrulukta tahmin edilmesi için yüksek hassasiyetli yapısal analizler beklenmektedir. Bununla birlikte, malzeme modelini kalibre etmek ve doğrulamak için kupon (numune) testlerinin yapılması hâlâ bir gerekliliktir. Bu çalışmada, test kuponları kullanılarak malzeme modeli doğrulanmış ve jet motor diskinin aşırı hız durumu modellenmiştir. Ayrıca, modelleme aşamasında farklı malzeme modellerinin etkisi de incelenmiştir. Test ve analiz sonuçları, patlama-hasar mekanizmasına dair net öngörü sağlayan ve seri test maliyetlerini düşüren üç eksenlilik parametresinin önemini ortaya koymaktadır.

Anahtar Kelimeler

• ti-6al-4v
• plastisite
• hasar
• patlama
• kritik plastik gerinim

Kaynakça

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