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A theoretical model is suggested which describes generation and growth of nanoscale cracks near tips of blunt cracks in nanocrystalline solids. Within the model, stress concentration near pre-existent/growing blunt cracks induces grain boundary sliding which leads to formation of dislocations at triple junctions of grain boundaries. ¡¾·Òë¡¿£¨±¾ÎÄ£©¹¹½¨ÁËÒ»¸öÀíÂÛÄ£ÐÍ£¬¸ÃÄ£ÐÍÄܹ»ÃèÊöÄÉÃ×¾§¹ÌÌåÖжÛÁÑÎÆ¼â¶Ë¸½½üµÄÄÉÃ×¼¶ÁÑÎÆµÄ²úÉúºÍÀ©Õ¹¡£ÔÚ¸ÃÄ£ÐÍÖУ¬Ó¦Á¦¼¯ÖÐÔÚÔ¤ÏÈ´æÔÚµÄ/²»¶ÏÔö³¤µÄ¶ÛÁÑÎÆÖÜΧ£¬ÓÕµ¼¾§½ç»¬¶¯£¬µ¼Ö¾§½çÈý²æ¾§´¦ÐγɵÄλ´í¡£ |
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