Ratcheting effect of reinforced graphite sheet with stainless steel insert (RGSWSSI) under cyclic compression at elevated temperature

Zheng, X.T. and Dai, W.C. and Chen, H.F. and Shen, J. (2018) Ratcheting effect of reinforced graphite sheet with stainless steel insert (RGSWSSI) under cyclic compression at elevated temperature. Fatigue and Fracture of Engineering Materials and Structures. ISSN 8756-758X (In Press)

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Abstract

Ratcheting and creep of RGSWSSI are tested under cyclic stress-controlled compression by a self-designed clamp from 500ºC to 600ºC. The effects of insert type, temperature, stress amplitude, stress rate, creep and loading sequence are considered. Results present that ratcheting deformations for RGSWSSI with 316L stainless steel tanged and bonded insert approach to each other and show little rate-dependence, while they slightly increase with the increment of stress amplitude and temperature. Moreover, obvious ratcheting effect takes place under cyclic pulsating loads with the peak stress of 32MPa at 500ºC or higher. The accumulated deformations of RGSWSSI under small stress amplitude only increase during about the first 25 cycles, and then always turn to shakedown. It can also be estimated by the corresponding static creep strain in practical engineering with good accuracy at high temperature. This work provides important data and understanding of RGSWSSI under harsh fluctuating loads.

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