Fracture Toughness of G450 Sheet Steels at Ambient Temperature Subjected to Tension

Pham, Cao Hung; Phan, Dang Khoa; Huynh, Minh Toan; Hancock, Gregory J.

doi:10.1016/j.istruc.2016.05.012

Cited by 2 publications

(2 citation statements)

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“…It is worth noting that the fracture toughness values of K C of the corner area at both initiation and propagation as shown in Table 1 are significantly lower than those of 82.0 MNm -3/2 (for 1.9 mm thickness flat plate), 86.6 MNm -3/2 (for 2.4 mm thickness flat plate) and 85.7 MNm -3/2 (for 3.0 mm thickness flat plate) respectively as given in Pham et al [2]. The explanation for this fact is possibly due to the heavily cold-working during cold-forming process.…”

Section: Fracture Toughnessmentioning

confidence: 64%

“…The fracture toughness of the flat part of G550 steel section to AS1397 for 0.42 and 0.59 mm was determined by Rogers and Hancock [1]. Recently, Pham et al [2] conducted a two-phase testing program including tensile fatigue and tensile monotonic loading tests to investigate the fracture toughness of the flat part of G450 sheet steels to AS1397 at ambient temperature for three thicknesses of 1.9, 2.4 and 3.0 mm. This paper presents the observation and fracture toughness measurement at the corners of G450 cold-formed high strength steel channels at ambient temperature for three thicknesses of 1.9, 2.4 and 3.0 mm.…”

Section: Introductionmentioning

confidence: 99%

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09.07: Observations on fracture toughness measurement: At the corners of G450 cold‐formed steel channel sections subjected to Tension

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High strength G450 steel sheets are manufactured from hot-rolled coil steel using a cold-reduction process which involves cold-rolling the steel under a series of rollers until a suitable thickness is achieved. Cold-formed sections are subsequently manufactured by bending flat sheets at ambient temperature to achieve desired shapes. The plastic deformation associated with bending process results in strain hardening of the material and this in turn affects the properties. Due to the small difference between the yield point and tensile strength, fracture toughness becomes an important parameter in ultimate strength analysis as cold-reduced steels are more brittle compared with hotrolled steels. Recent work to investigate the fracture behaviour of G450 sheet steels to AS1397 subjected to tension at ambient temperature (approximately 22°C) has been performed for different thicknesses (1.9, 2.4 and 3.0 mm). This paper describes the experimental investigation and observations of the corner effect on the fracture toughness of G450 steel. A series of six corner coupon tests of each thickness was cyclically loaded to produce a fatigue crack and then monotonically loaded in tension (ASTM E399) until fracture. A combined image processing technique was used to monitor the test from the two sides of the corner, where a grid of targets was initially marked at the surface and used for scaling and orientating all images. A digital correlation procedure was then applied to track the displacement of the tips of the notch of each crack and quantify the opening during the test. By correlating load with the different stages of propagation, the critical moments could be identified together with the fracture toughness. Results are thoroughly presented and discussed.

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Section: Fracture Toughnessmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%