Measurement of uniform and localized heat dissipation induced by cyclic loading |
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Authors: | T K Jacobsen B F Sørensen P Brøndsted |
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Institution: | 1. Materials Research Department, Ris? National Laboratory, 4000, Roskilde, Denmark
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Abstract: | An experimental technique is presented for measuring the heat dissipation and localization during cyclic loading of materials.
The temperature field is measured by a number of thermistors and an infrared camera, which scans the specimen surface continuously.
The specimen is mounted inside an isothermal chamber. The measured whole-field temperature can be used for detection of damage
propagation and localization. The resolution of the technique under various boundary conditions is discussed using a onedimensional
model for the heat loss under steady-state conditions. Applications of the technique are demonstrated for specimens made of
fiber-reinforced ceramic and polymer matrix composites (PMCs). A methodology is proposed for measuring changes in damping
and stiffness properties of viscoelastic polymer matrix composites using the temperature rise of a cyclic loaded specimen.
It is demonstrated that for a ceramic matrix composite, where interfacial frictional sliding gives rise to heat dissipation,
the temperature resolution can be used for detection of stress-strain hysteresis with an accuracy better than that of the
stress-strain data. |
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Keywords: | Infrared camera heat dissipation cyclic loading |
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