Journal Published Online: 30 January 2020
Volume 48, Issue 3

Reproducibility of Pop-Ins in Fracture Test of Heterogeneous Welds and Numerical Assessment of Crack Arrest

CODEN: JTEVAB

Abstract

For the occurrence of a “pop-in,” which represents the initiation, propagation, and arrest of a brittle crack in a three-point bending test, the evaluated fracture toughness may be very small. To experimentally verify whether the pop-in occurring at the specimen level is even included in the actual structure, the purpose of this study was to first induce pop-ins in a three-point bending test. It was possible to reproduce a pop-in at a local brittle zone (LBZ) by preparing heterogeneous weld specimens and considering the temperature dependence of the toughness of each welding material. Furthermore, a crack propagation analysis by the nodal release method was conducted. The crack opening stress including dynamic effects was compared before and after the pop-in. Because of the initiation of brittle cracks in the LBZ, the high-stress area shifted from the center with low toughness to the edge with high toughness. Decrease in the crack opening stress was determined as a factor contributing to the crack arrest.

Author Information

Kanna, Sohei
Structural Strength G., IHI Corporation Yokohoma Engineering Center, Yokohama, Japan
Yamashita, Yoichi
Structural Strength G., IHI Corporation Yokohoma Engineering Center, Yokohama, Japan
Kawabata, Tomoya
Department of Systems Innovation, The University of Tokyo, Tokyo, Japan
Pages: 16
Price: $25.00
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Details
Stock #: JTE20190472
ISSN: 0090-3973
DOI: 10.1520/JTE20190472