✦ LIBER ✦

Effect of crack-front width on fracture toughness of Douglas-fir

✍ Scribed by J.D. Barrett

Publisher: Elsevier Science
Year: 1976
Tongue: English
Weight: 656 KB
Volume: 8
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(76)90044-8

No coin nor oath required. For personal study only.

✦ Synopsis

The variation of K,= with crack-front width is investigated for Douglas-fir wood using beam and compact tension specimens. A study of within-board variation for the RT, TR, TL and RL systems of propagation showed a trend of decreasing K,= as the crack-front width increased from 0.5 to 5.5 in. The observed size effects are consistent with a weakest link failure mechanism. The longitudinal (TL and RL) systems of propagation in glued-laminated Douglas& are investigated using beam and compact tension specimens with crack-front widths of 342.25 in. The weakest link model is verhied and results obtained for the large specimens are consistent with observations of K,= on specimens with crack-front widths as small as 0.2 in. A cumulative distribution function is presented for K,= for longitudinal propagation in Dou&s-hr wood at 12% moisture content.

📜 SIMILAR VOLUMES

Effect of short fatigue cracks on plane

Effect of short fatigue cracks on plane strain fracture toughness

✍ C.N. Freed 📂 Article 📅 1970 🏛 Elsevier Science 🌐 English ⚖ 159 KB

AN IMPORTANT feature of the fracture mechanics approach to fracture toughness is the introduction of a fatigue crack at the notch tip of the specimen. For the fatigue crack to represent the Raw or crack which will exist in a structure, two conditions must be met: The crack must be formed in the spec

Influence of dynamic fracture toughness

Influence of dynamic fracture toughness on dynamic crack propagation

✍ L. Hodulak; A.S. Kobayashi; A.F. Emery 📂 Article 📅 1980 🏛 Elsevier Science 🌐 English ⚖ 730 KB

A dynamic finite element code was used in its "propagation mode" to assess the differences in dynamic crack propagat&n in a wedge-loaded (WL) single-edged notch (SEN) specimen, a tapered double cantilever beam (TDCB) specimen and a rectangular double cantilever beam (RDCB) specimen. The dynamic frac

Effect of specimen thickness on fracture

Effect of specimen thickness on fracture toughness

✍ M.O. Lai; W.G. Ferguson 📂 Article 📅 1986 🏛 Elsevier Science 🌐 English ⚖ 703 KB

The variation of fracture toughness with specimen thickness for Comsteel En25 compact tension specimens ranging in thickness from 4 mm to 25 mm and tempered from the asquenched state to 600°C is predicted reasonably well using the models proposed by Bluhm Proc. ASTM 61, 1324 (1961) and by Hahn er al

A further study about the effect of crac

A further study about the effect of crack depth and shape on fracture toughness

✍ Li Qingfen; Hu Shenghai; Zhong Boming; Wei Jiaquan 📂 Article 📅 1991 🏛 Elsevier Science 🌐 English ⚖ 872 KB

Fracture toughness tests have been carried out on two different heat-treated steels 60Si2MnA using both through-cracked specimens with different a/W ratios and semi-elliptical cracked ones with variable crack size and shape. Effects of crack depth and shape on fracture toughness have been studied. R

Effects of crack depth and shape on frac

Effects of crack depth and shape on fracture toughness in a spring steel

✍ Li Qingfen; Hu Shenghai; Pan Xinji 📂 Article 📅 1990 🏛 Elsevier Science 🌐 English ⚖ 797 KB

An experimental study described in this paper attempts to compare the behaviour of both through-cracked specimens with different a/w ratios and surface-cracked test pieces. Results show that the material is more resistant to crack growth when the a/Wratios are less than 0.1, both shallow throughand

Effective crack model for the determinat

Effective crack model for the determination of fracture toughness (KIce) of concrete

✍ B.L Karihaloo; P Nallathambi 📂 Article 📅 1990 🏛 Elsevier Science 🌐 English ⚖ 80 KB

A method is described for determining the fracture toughness of plain concrete from three-point bend specimens which accounts for the pre-peak crack growth that occurs upon loading. The fracture toughness so determined is shown not to depend on the size and geometry of the test specimen but on the m