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Çѱ¹Áö¹Ý°øÇÐȸ / v.14, no.4, 1998³â, pp.129-140
ź¼Ò¼º ±¸¼º ¸ðµ¨ÀÇ ¼öÄ¡ ÀÀ·Â ÀûºÐÀ» À§ÇÑ ´Ü°èºÐÇÒ ÀýÂ÷¿¡ °üÇÑ ¿¬±¸
( Modification of the Sloanġs Substepping Scheme for the Numerical Stress Integration of Elasto-plastic Constitutive Models )
±è¹ü»ó;Á¤Ãæ±â; Á¤È¸¿ø, SK°Ç¼³ ¿¬±¸¼Ò;Á¤È¸¿ø, ¼­¿ï´ëÇб³ °ø°ú´ëÇÐ Åä¸ñ°øÇаú;
 
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ź¼Ò¼º À¯ÇÑ ¿ä¼Ò ÇØ¼®Àº ±âÁöÀÇ º¯Çü·ü ÁõºÐ¿¡ ´ëÇÑ ÀÀ·Â ÀûºÐÀ» ÇÊ¿ä·Î Çϸç, ź¼Ò¼º ±¸¼º ¸ðµ¨ÀÇ °æ¿ì Ưº°ÇÑ °æ¿ì¸¦ Á¦¿ÜÇϰí´Â ÇØ¼®ÀûÀÎ ÀÀ·Â ÀûºÐÀÌ ºÒ°¡´ÉÇÏ°í ¼öÄ¡ÀûÀÎ ¹æ¹ýÀ» ÇÊ¿ä·Î ÇÑ´Ù. À̶§ ÀÀ·Â ¼öÄ¡ ÀûºÐÀÇ Á¤È®µµ°¡ ºñ¼±Çü À¯ÇÑ¿ä¼ÒÇØÀÇ ÀüüÀûÀÎ Á¤È®µµ¿¡ »ó´çÈ÷ Å« ¿µÇâÀ» ¹ÌÄ¡°Ô µÈ´Ù. º» ¿¬±¸¿¡¼­´Â ź¼Ò¼º ±¸¼º °ü°èÀÇ ÀÀ·Â ÀûºÐÀ» À§ÇÏ¿© ¿Ü¿¬Àû ¹æ¹ýÁßÀÇ Çϳª·Î¼­ SloanÀÌ Á¦¾ÈÇÑ ´Ü°èºÐÇÒ ÀýÂ÷¸¦ º¸¿ÏÇÏ¿© ¾ÈÁ¤ÀûÀ̰í Á¤ÂøÇÑ ÀÀ·Â ¼öÄ¡ ÀûºÐ¹ýÀ» Á¦½ÃÇϰíÀÚ ÇÑ´Ù. ¼öÁ¤ ¿ÀÀÏ·¯ ÀýÂ÷¿¡ µû¸¥ ¿ÀÂ÷ Á¶ÀýÀÇ ±âº» °³³äÀº ±×´ë·Î »ç¿ëÇÏ°í ¿ÀÂ÷¸¦ Æò°¡ÇÏ´Â ±âÁØ¿¡ ÀÀ·Â ¼öÁØÀÌ ¿µÇâÀ» ¹ÌÄ¡´Â ´ÜÁ¡À» º¸¿ÏÇÏ¿© ÀÀ·Â ¼öÁØ¿¡ °ü°è¾ø´Â ¾ÈÁ¤ÀûÀ̰í Á¤È®ÇÑ ¼öÄ¡ ÀûºÐ¹ýÀ» Á¦½ÃÇÏ¿´À¸¸ç, ±× °á°úÀÇ ½Å·Ú¼ºÀ» »ïÃà½ÃÇè¸ð»ç¸¦ ÀÌ¿ëÇÏ¿© °ËÁõÇÏ¿´´Ù.
Elasto-plastic finite element analysis of geotechnical boundary value problems necessitate the stress integration for the known strain increments. For the elasto-plastic constitutive model, the stress integration is generally achieved by numerical schemes, because analytical integration is impossible for general strain path. In this case, the accuracy of numerical stress integration has an important role on the overall accuracy of nonlinear finite element solution. In this study, the Sloan's substepping method which is one of explicit integration methods has been adopted and iris applicability has been checked. The unstability and inaccuracy of ifs results initiated from initial stress level were revealed. So. a new modified numerical integration method which employs the basic concept of modified Euler scheme for error control is proposed and accuracy and stability of the solutions are confirmed by triaxial test simulation.
 
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Numerical stress integration;Sloan¡®s substepping scheme;Constitutive model;
 
Çѱ¹Áö¹Ý°øÇÐȸÁö:Áö¹Ý / v.14, no.4, 1998³â, pp.129-140
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-215X
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199811920448287)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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