چكيده به لاتين
The need to develop metal matrix composites for use in high-performance structural and functional applications, for example, in the aerospace and defense, automotive, and transportation industries, has recently increased significantly. One of the most important mechanical properties of these materials is determining their fatigue limit. Normally, the S-N curve is used, which is a diagram of the magnitude of the cyclic stress and the logarithmic scale of the number of cycles to failure, which is time-consuming due to the need for a large number of different tests.
The development of techniques for predicting and estimating the remaining life and monitoring in these composite materials requires the understanding of different failure mechanisms. One of the non-destructive methods used to quickly determine the fatigue limit is based on the combination of non-contact Thermography test (IRT) and contact Acoustic Emission test (AE), which reduce the test time to several hours.
In this thesis, firstly, a Mg/TiO2-2.5% metal matrix composite piece was prepared by stir casting method and after heat treatment, hot and cold rolling, samples were prepared according to ASTM B557 standard. During tensile test simultaneously thermographic test and acoustic emission test are used to determine the beginning of the de-cohesion particles from the matrix. With these non-destructive tests, this point limit can be determined before the material's strength reaches its ultimate limit and failure
