ABSTRACT
Posted by MahaPatih on January 27, 2009
FRACTURE TOUGHNESS OF ALUMINUM-STEEL STRUCTURAL TRANSITION JOINT WITH PRE-CRACK TIP ON THE ALUMINUM AND STEEL SIDE
Structural Transition Joint is a bimetal system that provides welding of two different metasl by a conventional welding process, in this case is aluminum welded onto steel. Two or three different metal are being welded using explosion bonding process. The purpose of this research is to examine the fracture toughness characteristic of STJ NC 603 where the crack is perpendicular to the interface.
The fracture toughness tests were conducted using three point bending method based on the ASTM E399 standard. Six specimens were tested in this research, three specimens for pre-crack tip on the aluminum side and three specimens for the steel side. The test is to obtain the KQ values of each specimen, also the crack propagation characteristic of the bimetal system.
Result of the test showed that the average KQ value of the Nobelclad bimetal aluminum-steel structural transition joint test specimen with pre-crack tip on the aluminum side is 41.95 Ksi√inch. Average KQ values of the Nobelclad bimetal aluminum-steel structural transition joint test specimen with pre-crack tip on the steel side is 24.6 Ksi√inch. Structual failure of the bimetal occurred on the specimens with pre-crack tip on the aluminum side due to crack propagated horizontally and parallel to the interface.
