13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- (a) [0 / 90 ]s o o (b) [90 / 0 ] s o o Figure 3. Through thickness variations of interlaminar normal stress zσ The variations of interlaminar stress τyz for uncoupled and coupled ones are shown in Fig. 4. The present results agree well with those of Artel and Becker [13], and Mirzababaee and Tahani [14] near the free edge. The value of τyz changes abruptly near the free edge at the interface and descends to zero at the free edge. In contrast to present results, those of Artel and Becker [13], and Mirzababaee and Tahani [14] cannot satisfy the traction free condition along free edges. Present results shows that interlaminar stress gradient occurs near the free edge due to the dissimilar properties of adjacent plies and coupled stresses are larger than those of uncoupled. (a) [0 / 90 ]s o o (b) [90 / 0 ] s o o Figure 4. Distributions of interlaminar shear stress yzτ Electrical quantities gradient may also occur in the vicinity of free edge at interfaces. The electric field component Ey changes dramatically near the free edge and vanishes at the free edge. Moreover, another electric field component Ez becomes singular at the free edge. In addition, it is worth to mention that present results disagreed with those of Artel and Becker [13], and Mirzababaee and Tahani [14] in magnitude.
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