Metal matrix composites are high strength materials used in a wide range of applications including automotive and military vehicles. Metal matrix componstes can be designed to have specific stiffness, controlled thermal expansion cofienents, and specific thermal conductivity. Fatigue testing metal matrix composites is an essential part of reasch and development, design, and quality adduence. Fatige testing MMC's can be done a number of different ways; strain controled fatigue, load controlled fatigue, and thermomechanical fatigue are the most common. Currently, there is not an ASTM or ISO test method for determining the fatigue charicteristics of metal matrix composites. However, TestResources suggests the use of metal fatigue test standards. High cycle fatigue testing can be done with either strain control of load control. Both ASTM and ISO have standard test methods for strain and load control fatigue testing. For strain control, refer to ASTM E606 or ISO 12106. For load control refer to ASTM E466 or ISO 1099. Fatigue testing is done using three different methods, all of which are covered by ASTM. First, ASTM E606 covers strain control axial fatigue. Third, ASTM E466 covers load controlled fatigue testing. TestResources suggests either a servo hydraulic or servo electric t dynamic testing machines for fatigue testing materials. Servo hydraulic test machines, such as the 902 series has high load capabilities up to 22 kip and high cyclic frequency capacity up to 100 Hz. Servo electric test machines, such as the 830 and 810 series, have lower load capacity and lower speed capacity then the servo hydraulic models. However, this makes them much less expensive then the servo hydraulic test machines and just as capable in terms of meeting the requirements of ASTM and ISO strain controlled fatigue testing standards. There are a wide variety of controllers that can be used with the dynamic test machines.

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