The FiberForm sample was provided by Fiber Materials, Inc. and was used as received (see Figure ). The surface normal was parallel to the through-the-thickness (TTT) direction, which is perpendicular to the compression plane (described in Section I). A sample size of 28 mm × 8 mm × 1 mm was used, and the sample was heated resistively using a sample mount described previously . Briefly, the sample mount was composed of two water-cooled copper electrodes that were electrically isolated by alumina spacers. The FiberForm sample, which has a resistance (at room temperature) of 2.3 Ohms along its long dimension, was clamped between the copper electrodes, and current was passed through the sample. The sample temperature was controlled by varying the current from 3.75 to 12.5 A. As the copper electrodes, to which the ends of the sample were clamped, were water-cooled, only the center of the sample reached a high temperature.