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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Steen, Marc Vallés, José-Lorenzo |
| Copyright Year | 1996 |
| Abstract | The high temperature fatigue behaviour of two 2D reinforced ceramic matrix composites (CMCs) Is studied under high vacuum conditions. The mechanical loads imposed result in matrix cracking upon first loading, so that continued cyclic loading results in progressive interfacial debonding and/or matrix crack multiplication, as well as fibre failure. In order to investigate whether the fatigue life is mainly governed by time-dependent creep or by cyclically induced fatigue damage, a range of frequencies and two stress ratios are explored in stress controlled fatigue tests. The results obtained indicate that under pulsating fatigue (positive stress ratios or tension-tension) the material response is affected by both creep and fatigue mechanisms. The cyclic damage component gains in relative importance with increasing test frequency. Under reversed loading conditions (negative stress ratios), and depending on the creep strength mismatch between the fibres and the matrix, the time-dependent damage component can be largely suppressed, and the composite fatigue behaviour can become close to purely cycle-dependent. In both cases and for both composites fatigue failure is triggered by fibre failure. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791878767 |
| DOI | 10.1115/96-GT-532 |
| Volume Number | Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General |
| Conference Proceedings | ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition |
| Language | English |
| Publisher Date | 1996-06-10 |
| Publisher Place | Birmingham, UK |
| Access Restriction | Open |
| Subject Keyword | Cycles Cracking (materials) Fatigue life Ceramic matrix composites Fatigue testing Creep Fatigue High temperature Fatigue failure Fracture (materials) Stress Fibers Fracture (process) Composite materials Vacuum Tension Damage Failure Fatigue damage |
| Content Type | Text |
| Resource Type | Article |
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