Effects of the Striking Edge Radius and Asymmetrical Strikes on Charpy Impact Test Results

Tanaka, Michihiro; Ohno, Yuki; Horigome, H; Tani, Hideki; Shiota, Koji; Misawa, Akihiro

doi:10.1520/stp14662s

Cited by 6 publications

(8 citation statements)

References 1 publication

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“…A striking tup with a 1.5-mm radius was chosen. This parameter has a strong influence on the energy transmitted (Tanaka et al 1995). The distance between the supports was 240 mm.…”

Section: Charpy Impact Strengthmentioning

confidence: 99%

Resinous Wood of Pinus pinaster Ait.: Physico-mechanical Properties

García-Iruela¹,

Esteban²,

Palacios³

et al. 2016

BioResources

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Pinus pinaster Aiton is the pine with the largest natural area of distribution in Spain and the species that sustains the country's resin industry, with an annual average production of 3.2 to 3.5 kg per tree. After trees have been tapped, their wood has a high resin content and is of little use because of machining difficulties. For the first time, resinous wood of this species was characterized to compare its physico-mechanical properties with those of non-resinous wood. Significant differences were found in all the properties studied except modulus of elasticity. The resin produced by tapping decreased swelling, probably by reducing accessibility to the -OH groups and decreasing the available spaces during the capillary condensation phase. Similarly, tapping caused an increase in wood density and therefore in hardness, at the same time improving the mechanical properties.

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“…A striking tup with a 1.5-mm radius was chosen. This parameter has a strong influence on the energy transmitted (Tanaka et al 1995). The distance between the supports was 240 mm.…”

Section: Charpy Impact Strengthmentioning

confidence: 99%

Resinous Wood of Pinus pinaster Ait.: Physico-mechanical Properties

García-Iruela¹,

Esteban²,

Palacios³

et al. 2016

BioResources

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“…However, values as low as 60 J (Towers 1983;Morita and Kobayashi 2004) or 100 J (Siewert and Vigliotti 1995) were also reported for some materials. This threshold appears to be material-dependent (Nanstad and Sokolov 1995) and related to the characteristic fracture properties of the material (Tanaka et al 1995).…”

Section: Introductionmentioning

confidence: 97%

“…The main reasons for this increase in KV, often observed when test specimens do not separate, were identified in the interaction between the specimen and the 8 mm-striker corners and in the increased friction between specimen and anvils (Tanaka et al 1995). In additional, the standard deviation of results was also reported to be significantly larger for the 2 mm-striker (Siewert and Vigliotti 1995).…”

Section: Introductionmentioning

confidence: 98%

“…Numerous published studies (Towers 1983;Revise 1990;Fink 1990;Naniwa et al 1990;Ruth 1995;Nanstad and Sokolov 1995;Tanaka et al 1995;Siewert and Vigliotti 1995;McCowan et al 2000) have investigated the effect of the striking edge radius on the results of "conventional" (i.e. non-instrumented) Charpy tests, in terms of absorbed energy KV, lateral expansion and shear fracture appearance.…”

Section: Introductionmentioning

confidence: 99%

“…Limited information, and mostly of qualitative rather than quantitative nature, is available in the literature on the effect of striking edge radius on instrumented Charpy data (Naniwa et al 1990;Nanstad and Sokolov 1995;Tanaka et al 1995;Morita and Kobayashi 2004).…”

Section: Introductionmentioning

confidence: 99%

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Influence of striking edge radius (2 vs. 8 mm) on instrumented Charpy data and absorbed energies

Lucon

2008

Int J Fract

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The most commonly used test standards for performing Charpy impact tests (ISO 148 and ASTM E 23) envisage the use of strikers having different radii of the striking edge, i.e. 2 mm (ISO) and 8 mm (ASTM). The effect of striker geometry on Charpy results was extensively studied in the past in terms of absorbed energy measured by the machine encoder, but few investigations are available on the influence of striker configuration on the results of instrumented Charpy tests (characteristic forces, displacements and integrated energy). In this paper, these effects are investigated based on the analysis of published results from three interlaboratory studies and some unpublished Charpy data obtained at SCK·CEN. The t-test was used for establishing the statistical significance of the observed effects. The instrumented variables which are the most sensitive to the radius of the striking edge are the maximum force and its corresponding displacement, with 8 mm-strikers providing systematically higher values. The effect on general yield forces, on the other hand, is less consistent and more difficult to rationalize, although 2 mm-strikers generally tend to deliver higher values. Absorbed energies, obtained both from the instrumented trace and from the pendulum encoder, are almost insensitive to the type of striker up to 200 J. For higher energy levels, the values obtained E. Lucon (B) SCK·CEN, from 8 mm-strikers become progressively larger. Data scatter is generally higher for 2 mm-strikers.

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Mechanical Properties of Wood from the Relict Abies pinsapo Forests

Esteban¹,

Palacios²,

Fernández³

et al. 2009

Forest Products Journal

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The mechanical properties of Abies pinsapo Boiss., a relict species from the south of Spain, have been studied very little due to its scarcity and the high level of protection of this species. Forest fire prevention measures involving felling of mature trees have enabled the species to be characterized for the first time. A comparison of its three regions of provenance, (1) Sierra de Grazalema, (2) Sierra Bermeja, (3) Sierra de las Nieves, was included in this evaluation. Tests were conducted using small dimension defect-free test pieces in accordance with the corresponding Spanish mechanical property test standard. In order to relate the findings to the wood anatomy, measurements were taken of tracheid length and diameter, tracheid wall thickness, and growth rate. The mean values per region of provenance (1, 2, 3) were Charpy impact strength, 16.9, 12.4, 14.3 (J); modulus of rupture (MOR), 74.9, 68.8, 71.1 (N/mm2); tensile strength perpendicular to the grain (tangential), 1.9, 2.0, 1.8 (N/mm2); tensile strength perpendicular to the grain (radial), 2.0, 2.0, 1.9 (N/mm2); splitting strength, 2.4, 2.3, 2.3 (N/mm); and compressive strength parallel to the grain, 40.0, 39.9, 39.9 (N/mm2). The findings showed that the values of most of the properties studied in the three regions of provenance did not present statistically significant differences.

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Effects of the Striking Edge Radius and Asymmetrical Strikes on Charpy Impact Test Results

Cited by 6 publications

References 1 publication

Resinous Wood of Pinus pinaster Ait.: Physico-mechanical Properties

Resinous Wood of Pinus pinaster Ait.: Physico-mechanical Properties

Influence of striking edge radius (2 vs. 8 mm) on instrumented Charpy data and absorbed energies

Mechanical Properties of Wood from the Relict Abies pinsapo Forests

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