Refined Dugdale plastic zones of an external circular crack

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Jin X., Chaiyat S., Keer L.M., Kiattikomol K.

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2008

วารสาร: Journal of the Mechanics and Physics of Solids (0022-5096)

Volume number: 56

Issue number: 4

หน้าแรก: 1127

หน้าสุดท้าย: 1146

จำนวนหน้า: 20

นอก: 0022-5096

eISSN: 1873-4782

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-40849115152&doi=10.1016%2fj.jmps.2007.10.009&partnerID=40&md5=c5ae3713727ce9668a516aa99e18aeac

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

The refined Dugdale-type plastic zones ahead of an external circular crack, subjected to a uniform displacement at infinity, are evaluated both analytically and numerically. The analytical method utilizes potential theory in classical linear elasticity with emphasis on the contrast from the internal crack problem. A closed-form solution to the mixed boundary problem is obtained to predict the length of the plastic zone for a Tresca yield condition. The analytical solution is also used to benchmark the results obtained from the numerical method, which show good agreement. Through an iterative scheme, the numerical technique is able to estimate the size of crack tip plasticity zone, which is governed by the non-linear von Mises criterion. The relationships between the applied displacement and the length of the plastic zone are compared for the different yielding conditions. Computational modeling has demonstrated that the plastic constraint effect based on the true yield condition can significantly influence the load-bearing capacity. It is also discovered from the comparative study that the stress components predicted by the three different yield conditions may differ notably; however, the stress triaxiality in the ligament region has only small deviations. The proposed study may find applications in predicting the plastic flow in a circumferentially notched round bars under tension. ฉ 2007 Elsevier Ltd. All rights reserved.

คำสำคัญ

Deeply notched bar, Plastic constraint factor