The Experts below are selected from a list of 26745 Experts worldwide ranked by ideXlab platform
Manuel Guaita - One of the best experts on this subject based on the ideXlab platform.
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load carrying capacity of halved and tabled tenoned timber scarf joint
Materials and Structures, 2016Co-Authors: Jose R Aira, Guillermo Iniguezgonzalez, Manuel Guaita, Francisco ArriagaAbstract:The stress distribution of timber tenoned scarf joint subjected to tension force was analysed by means of finite element method. This analysis was compared and validated with results from an experimental work on 42 specimens of Scots pine wood (Pinus sylvestris L.) with 48 × 148 mm in cross-section and 1932 mm, in length, manufactured with a tenoned scarf joint in the middle of its length. Specimens were divided in eight groups corresponding to different joint geometries. A plane finite element analysis using ANSYS software was made considering the elasticity moduli, Poisson ratios and friction coefficients obtained in previous research works for the same material. Three different failure modes were analysed: Compression Parallel to the grain in the notch area, shear Parallel to the grain in the heel surface, and the combination of tension and bending moment in the effective cross-section of the piece, which is limited by the crack initiation due to tension perpendicular to the grain. Equations for the verification of this joint are proposed as a practical conclusion.
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failure modes in halved and tabled tenoned timber scarf joint by tension test
Construction and Building Materials, 2015Co-Authors: Jose R Aira, Guillermo Iniguezgonzalez, Francisco Arriaga, Manuel GuaitaAbstract:The structural behaviour of halved and tabled tenoned scarf joint subjected to tensile stresses was experimentally analysed to find the different failure modes. A total of 42 specimens of Scots pine wood (Pinus sylvestris L.) were made. Specimens were divided into 8 groups corresponding to different joint geometries. Three different failure modes were observed: Compression Parallel to the grain in the notch area, shear Parallel to the grain in the heel surface, and by cracking starting in the reduced cross-section. The load that caused crack initiation was obtained, and the influence of the length of the overlapping surface was analysed.
Jose R Aira - One of the best experts on this subject based on the ideXlab platform.
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load carrying capacity of halved and tabled tenoned timber scarf joint
Materials and Structures, 2016Co-Authors: Jose R Aira, Guillermo Iniguezgonzalez, Manuel Guaita, Francisco ArriagaAbstract:The stress distribution of timber tenoned scarf joint subjected to tension force was analysed by means of finite element method. This analysis was compared and validated with results from an experimental work on 42 specimens of Scots pine wood (Pinus sylvestris L.) with 48 × 148 mm in cross-section and 1932 mm, in length, manufactured with a tenoned scarf joint in the middle of its length. Specimens were divided in eight groups corresponding to different joint geometries. A plane finite element analysis using ANSYS software was made considering the elasticity moduli, Poisson ratios and friction coefficients obtained in previous research works for the same material. Three different failure modes were analysed: Compression Parallel to the grain in the notch area, shear Parallel to the grain in the heel surface, and the combination of tension and bending moment in the effective cross-section of the piece, which is limited by the crack initiation due to tension perpendicular to the grain. Equations for the verification of this joint are proposed as a practical conclusion.
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failure modes in halved and tabled tenoned timber scarf joint by tension test
Construction and Building Materials, 2015Co-Authors: Jose R Aira, Guillermo Iniguezgonzalez, Francisco Arriaga, Manuel GuaitaAbstract:The structural behaviour of halved and tabled tenoned scarf joint subjected to tensile stresses was experimentally analysed to find the different failure modes. A total of 42 specimens of Scots pine wood (Pinus sylvestris L.) were made. Specimens were divided into 8 groups corresponding to different joint geometries. Three different failure modes were observed: Compression Parallel to the grain in the notch area, shear Parallel to the grain in the heel surface, and by cracking starting in the reduced cross-section. The load that caused crack initiation was obtained, and the influence of the length of the overlapping surface was analysed.
Hideo Nakajima - One of the best experts on this subject based on the ideXlab platform.
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peculiar formation mechanism of a plateau stress region during dynamic compressive deformation of porous carbon steel with oriented cylindrical pores
Acta Materialia, 2012Co-Authors: Y H Song, Masakazu Tane, Hideo NakajimaAbstract:Abstract Dynamic and quasi-static compressive deformation of as-cast and normalized porous S15CK carbon steels with cylindrical pores oriented in one direction was investigated at 298 and 77 K, using the split Hopkinson pressure bar method and a universal testing machine, combined with an acoustic emission measurement system, to clarify the formation mechanism of a plateau stress region where deformation proceeds with almost no stress increase. Dynamic and quasi-static Compressions perpendicular to the orientation of the pores at 298 and 77 K do not produce a plateau stress region in the as-cast and normalized porous S15CK, because the localized crack formation and slip deformation that originate from the large concentration of stress around pores promotes densification in the early stage of the stress–strain curves. When the samples undergo dynamic Compression Parallel to the pore direction at 77 K, the matrix becomes brittle, and cracks are easily formed. However, the pores do not easily collapse, because they are oriented along the compressive direction. Therefore, densification occurs at a higher strain level. In addition, the formation of small cracks in the matrix decreases the work hardening rate. As a result, a plateau stress region with high stress amplitude and wide strain range appears, which is independent of the microstructure. This mechanism for the formation of the plateau stress region is completely different from that of metal foams with isotropic pores, which is based on sequential inhomogeneous deformation. As a result, energy absorption 10 times that of commercial aluminum foams is achieved.
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appearance of a plateau stress region during dynamic compressive deformation of porous carbon steel with directional pores
Scripta Materialia, 2011Co-Authors: Y H Song, Masakazu Tane, Hideo NakajimaAbstract:The dynamic Compression behavior of porous carbon steels with cylindrical pores oriented in one direction was investigated. The application of dynamic Compression Parallel to the orientation of the pores at 77 K resulted in the formation of a plateau stress region, in which considerable impact energy is absorbed. The amount of energy absorbed is 10 times that of commercial aluminum foams. Plateau stress regions appear when crack propagation is suppressed, suggesting a starkly different mechanism from that of metal foams.
Francisco Arriaga - One of the best experts on this subject based on the ideXlab platform.
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load carrying capacity of halved and tabled tenoned timber scarf joint
Materials and Structures, 2016Co-Authors: Jose R Aira, Guillermo Iniguezgonzalez, Manuel Guaita, Francisco ArriagaAbstract:The stress distribution of timber tenoned scarf joint subjected to tension force was analysed by means of finite element method. This analysis was compared and validated with results from an experimental work on 42 specimens of Scots pine wood (Pinus sylvestris L.) with 48 × 148 mm in cross-section and 1932 mm, in length, manufactured with a tenoned scarf joint in the middle of its length. Specimens were divided in eight groups corresponding to different joint geometries. A plane finite element analysis using ANSYS software was made considering the elasticity moduli, Poisson ratios and friction coefficients obtained in previous research works for the same material. Three different failure modes were analysed: Compression Parallel to the grain in the notch area, shear Parallel to the grain in the heel surface, and the combination of tension and bending moment in the effective cross-section of the piece, which is limited by the crack initiation due to tension perpendicular to the grain. Equations for the verification of this joint are proposed as a practical conclusion.
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failure modes in halved and tabled tenoned timber scarf joint by tension test
Construction and Building Materials, 2015Co-Authors: Jose R Aira, Guillermo Iniguezgonzalez, Francisco Arriaga, Manuel GuaitaAbstract:The structural behaviour of halved and tabled tenoned scarf joint subjected to tensile stresses was experimentally analysed to find the different failure modes. A total of 42 specimens of Scots pine wood (Pinus sylvestris L.) were made. Specimens were divided into 8 groups corresponding to different joint geometries. Three different failure modes were observed: Compression Parallel to the grain in the notch area, shear Parallel to the grain in the heel surface, and by cracking starting in the reduced cross-section. The load that caused crack initiation was obtained, and the influence of the length of the overlapping surface was analysed.
Guillermo Iniguezgonzalez - One of the best experts on this subject based on the ideXlab platform.
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load carrying capacity of halved and tabled tenoned timber scarf joint
Materials and Structures, 2016Co-Authors: Jose R Aira, Guillermo Iniguezgonzalez, Manuel Guaita, Francisco ArriagaAbstract:The stress distribution of timber tenoned scarf joint subjected to tension force was analysed by means of finite element method. This analysis was compared and validated with results from an experimental work on 42 specimens of Scots pine wood (Pinus sylvestris L.) with 48 × 148 mm in cross-section and 1932 mm, in length, manufactured with a tenoned scarf joint in the middle of its length. Specimens were divided in eight groups corresponding to different joint geometries. A plane finite element analysis using ANSYS software was made considering the elasticity moduli, Poisson ratios and friction coefficients obtained in previous research works for the same material. Three different failure modes were analysed: Compression Parallel to the grain in the notch area, shear Parallel to the grain in the heel surface, and the combination of tension and bending moment in the effective cross-section of the piece, which is limited by the crack initiation due to tension perpendicular to the grain. Equations for the verification of this joint are proposed as a practical conclusion.
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failure modes in halved and tabled tenoned timber scarf joint by tension test
Construction and Building Materials, 2015Co-Authors: Jose R Aira, Guillermo Iniguezgonzalez, Francisco Arriaga, Manuel GuaitaAbstract:The structural behaviour of halved and tabled tenoned scarf joint subjected to tensile stresses was experimentally analysed to find the different failure modes. A total of 42 specimens of Scots pine wood (Pinus sylvestris L.) were made. Specimens were divided into 8 groups corresponding to different joint geometries. Three different failure modes were observed: Compression Parallel to the grain in the notch area, shear Parallel to the grain in the heel surface, and by cracking starting in the reduced cross-section. The load that caused crack initiation was obtained, and the influence of the length of the overlapping surface was analysed.