A continuum fatigue damage model for the cyclic thermal shocked ceramic-matrix composites. (May 2020)

• Record Type: Journal Article
• Authors: Yang, Zhengmao; Liu, Hui
• Is Part Of: International journal of fatigue. Volume 134(2020)
• Publication Date: 2020-05
• Subjects: Ceramic-matrix composites (CMCs) -- Fatigue modeling -- Damage accumulation -- Plastic deformation; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2020.105507
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Developed a new continuum thermo-mechanical fatigue damage model for ox/ox-CMCs. The model can predict damage evolution under coupled cyclic thermal shocks & mechanical loading. The damage consists of the thermal stress-related damage and the mechanical fatigue damage. Validated the fatigue damage model based on detail experiments. Abstract: In the present work, the tension-compression fatigue behavior of the 2-D woven oxide/oxide-ceramic-matrix composites is investigated. Experimental investigations reveal different fatigue failure mechanism for the original and the cyclic thermal shocked ox/ox-CMCs, and both materials undergo cyclic softening in the whole loading history. Based on the decrease of the elastic modulus, a new fatigue damage model is proposed to characterize the fatigue damage evolution and predict the fatigue life of both the original and the cyclic thermal shocked ox/ox-CMCs. The total damage is separated into the thermal stress-related damage from thermal shocks and the fatigue damage from applied mechanical loads. The good agreement between the proposed model and experimental data indicates that the damage model has the potential to describe complex thermomechanical damage of the ox/ox-CMCs under coupled cyclic thermal shocks and mechanical loading.