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Brown, KR; Baratta, FI

doi:10.1520/stp24706s

Cited by 2 publications

(3 citation statements)

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“…(i) only half size compared with an equivalent K Ic (ASTM E 399) specimen is required in order to develop plane strain conditions at the crack tip (ii) no fatigue pre-crack is needed, which frees it from the need for fatigue equipment that can be both capital intensive and expensive to run. 19 It has been reported that Chevron notched specimens have been widely used to measure the fracture toughness of many materials including brittle ceramics to ductile metals, as well as polymers and metal-ceramic composites. 20 The result difference from these comparative tests of the plane strain fracture toughness K Ic (the plane strain fracture toughness according to ASTM Standard E399) and K Iv or K Ivj (the plane strain fracture toughness determined with a short rod/bar specimen according to ASTM Standard E1304) is less than ¡10%.…”

Section: Methodsmentioning

confidence: 99%

“…no fatigue pre-crack is needed, which frees it from the need for fatigue equipment that can be both capital intensive and expensive to run. 19…”

Section: Methodsmentioning

confidence: 99%

“…17,18 By reason of the method to estimate fracture toughness is difficult, high cost and always time consuming. 19 The literatures on fracture toughness in Mg alloys are still quite limited. The possibility of improving the fracture toughness by age hardening in ZM61 alloy has not been investigated yet.…”

Section: Introductionmentioning

confidence: 99%

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Effect of aging treatment on fracture toughness in ZM61 magnesium alloy

Zhang

Zhao

et al. 2015

Materials Science and Technology

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The effect of aging treatment on fracture toughness in Mg-6Zn-1Mn (wt-%) was investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, uniaxial tensile and fracture toughness tests, respectively. The results showed that the fracture toughness of Mg-6Zn-1Mn alloy can be enhanced by aging treatment. The fracture toughness and strength showed a reverse trend in single aged and double aged alloy. Synergetic effect of fine grains and precipitates improved the fracture toughness more sharply than aging treatment. The precipitate free zones and grain boundary precipitates made the largest contribution to the reduction of toughness. Under as extruded and aged conditions, the main origins of cracks were elastic incompatibility and plastic deformation.

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Section: Methodsmentioning

confidence: 99%

“…no fatigue pre-crack is needed, which frees it from the need for fatigue equipment that can be both capital intensive and expensive to run. 19…”

Section: Methodsmentioning

confidence: 99%

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Effect of aging treatment on fracture toughness in ZM61 magnesium alloy

Zhang

Zhao

et al. 2015

Materials Science and Technology

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Prospective Teachers’ Misconceptions About Classification of Plants and Changes in Their Misconceptions During Pre-Service Education

Yangin

Sidekli

Gökbulut

2014

JBSE

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This study reported herein aimed to reveal prospective teachers’ misconceptions about classification of plants and the effect of pre-service education program on their correct conceptions of this biological issue. Prospective teachers majoring in Elementary School Classroom Teacher Education constituted the target population of this study during the fall semester of the 2012-2013 academic years from Turkey. In order to reveal the difference between the misconceptions of prospective teachers who are at the beginning and at the end of their university education, the research was conducted as a cross-sectional study (78 first and 84 fourth class). The results showed that the prospective teachers in both groups have misconceptions and considerable confusion over the concepts of without-seed plants, seedy plants, vascular plants, non-vascular plants, gymnosperm plants, angiosperm plants, fruit and vegetable. In addition, the pre-service education did not seem to have an important effect on correction of prospective teachers’ misconceptions about classification of plants. In this context, prospective teachers are graduated with misconceptions about classification of plants. Key words: biology, classification of plants, misconceptions, prospective teachers.

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Cited by 2 publications

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Effect of aging treatment on fracture toughness in ZM61 magnesium alloy

Effect of aging treatment on fracture toughness in ZM61 magnesium alloy

Prospective Teachers’ Misconceptions About Classification of Plants and Changes in Their Misconceptions During Pre-Service Education

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