Effects of weld strength mismatch on J and CTOD estimation procedure for SE(B) specimens

Autor(es)

Donato, Gustavo H. B. ^[1] ; Magnabosco, Rodrigo ^[2] ; Ruggieri, Claudio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Naval Architecture & Ocean Engn, PNV EPUSP, BR-05508030 Sao Paulo - Brazil

^[2] Ignatian Educ Fdn, Dept Mech Engn, BR-09850901 Sao Bernardo Do Campo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF FRACTURE; v. 159, n. 1, p. 1-20, SEP 2009.
• Citações Web of Science: 20

Resumo

This work examines the effect of weld strength mismatch on fracture toughness measurements defined by J and CTOD fracture parameters using single edge notch bend (SE(B)) specimens. A central objective of the present study is to enlarge on previous developments of J and CTOD estimation procedures for welded bend specimens based upon plastic eta factors (eta) and plastic rotational factors (r (p) ). Very detailed non-linear finite element analyses for plane-strain models of standard SE(B) fracture specimens with a notch located at the center of square groove welds and in the heat affected zone provide the evolution of load with increased crack mouth opening displacement required for the estimation procedure. One key result emerging from the analyses is that levels of weld strength mismatch within the range +/- 20% mismatch do not affect significantly J and CTOD estimation expressions applicable to homogeneous materials, particularly for deeply cracked fracture specimens with relatively large weld grooves. The present study provides additional understanding on the effect of weld strength mismatch on J and CTOD toughness measurements while, at the same time, adding a fairly extensive body of results to determine parameters J and CTOD for different materials using bend specimens with varying geometries and mismatch levels. (AU)

• Processo FAPESP: 04/15719-1 - Efeitos de heterogeneidades mecânicas em juntas soldadas sobre a análise de defeitos em dutos e risers de gás e petróleo
• Beneficiário: Gustavo Henrique Bolognesi Donato
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto