The Experts below are selected from a list of 17490 Experts worldwide ranked by ideXlab platform
D.s. Jeng - One of the best experts on this subject based on the ideXlab platform.
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Finite element modeling for the mechanical behavior of dowel-type timber joints
Computers & Structures, 2003Co-Authors: C.j. Chen, T.l. Lee, D.s. JengAbstract:The mechanical performances of timber joints are particularly important for timber engineers involved in the design of the wood structures. In general, joints are often one of the weakest points in a timber structure. However, to simplify the problem, most previous investigations have considered the effects of individual parameters on the mechanical behavior of timber joints. Thus, it is difficult to undertake an analytical study due to interactions among parameters. In this paper, a finite element model for a dowel-type timber joint is proposed to investigate the mechanical performance of un-reinforced and reinforced timber joints affected by the various parameters. Moreover, a stress-interaction Based Failure Criterion is proposed to predict the strength of such joints. The numerical prediction of the proposed finite element method model overall agrees with the experimental results of mechanical testing.
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Finite element modeling for the mechanical behavior of dowel-type timber joints
Computers & Structures, 2003Co-Authors: C.j. Chen, T.l. Lee, D.s. JengAbstract:The mechanical performances of timber joints are particularly important for timber engineers involved in the design of the wood structures. In general, joints are often one of the weakest points in a timber structure. However, to simplify the problem, most previous investigations have considered the effects of individual parameters on the mechanical behavior of timber joints. Thus, it is difficult to undertake an analytical study due to interactions among parameters. In this paper, a finite element model for a dowel-type timber joint is proposed to investigate the mechanical performance of un-reinforced and reinforced timber joints affected by the various parameters. Moreover, a stress-interaction Based Failure Criterion is proposed to predict the strength of such joints. The numerical prediction of the proposed finite element method model overall agrees with the experimental results of mechanical testing.No Full Tex
C.j. Chen - One of the best experts on this subject based on the ideXlab platform.
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Finite element modeling for the mechanical behavior of dowel-type timber joints
Computers & Structures, 2003Co-Authors: C.j. Chen, T.l. Lee, D.s. JengAbstract:The mechanical performances of timber joints are particularly important for timber engineers involved in the design of the wood structures. In general, joints are often one of the weakest points in a timber structure. However, to simplify the problem, most previous investigations have considered the effects of individual parameters on the mechanical behavior of timber joints. Thus, it is difficult to undertake an analytical study due to interactions among parameters. In this paper, a finite element model for a dowel-type timber joint is proposed to investigate the mechanical performance of un-reinforced and reinforced timber joints affected by the various parameters. Moreover, a stress-interaction Based Failure Criterion is proposed to predict the strength of such joints. The numerical prediction of the proposed finite element method model overall agrees with the experimental results of mechanical testing.
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Finite element modeling for the mechanical behavior of dowel-type timber joints
Computers & Structures, 2003Co-Authors: C.j. Chen, T.l. Lee, D.s. JengAbstract:The mechanical performances of timber joints are particularly important for timber engineers involved in the design of the wood structures. In general, joints are often one of the weakest points in a timber structure. However, to simplify the problem, most previous investigations have considered the effects of individual parameters on the mechanical behavior of timber joints. Thus, it is difficult to undertake an analytical study due to interactions among parameters. In this paper, a finite element model for a dowel-type timber joint is proposed to investigate the mechanical performance of un-reinforced and reinforced timber joints affected by the various parameters. Moreover, a stress-interaction Based Failure Criterion is proposed to predict the strength of such joints. The numerical prediction of the proposed finite element method model overall agrees with the experimental results of mechanical testing.No Full Tex
Douglas A. Scarth - One of the best experts on this subject based on the ideXlab platform.
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Effects of curvature on ductile fracture initiation in curved compact tension specimens of hydrided irradiated Zr-2.5Nb materials with split circumferential hydrides
Engineering Fracture Mechanics, 2019Co-Authors: Shin Jang Sung, Jwo Pan, Sterling St Lawrence, Douglas A. ScarthAbstract:Abstract The effects of curvature on K, J, plastic zone, near-tip stress and fracture initiation in curved compact tension (CCT) specimens of unhydrided and hydrided irradiated Zr-2.5Nb materials are determined by three-dimensional finite element analyses. Based on a strain-Based Failure Criterion, the fracture initiation load for unhydrided CCT specimens is slightly lower than those for unhydrided compact tension (CT) and pressure tube (PT) specimens. For hydrided specimens, the reductions of fracture initiation loads for CT, CCT and PT specimens are similar. The fractions of fracture initiation loads for hydrided specimens are about 60–70% of those for unhydrided specimens.
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Ductile fracture initiation with consideration of strain concentration and stress triaxiality near crack fronts in compact tension specimens of hydrided irradiated Zr-2.5Nb materials with split circumferential hydrides
Engineering Fracture Mechanics, 2017Co-Authors: Shin Jang Sung, Jwo Pan, Poh Sang Lam, Douglas A. ScarthAbstract:Abstract Ductile fracture initiation with consideration of strain concentration and stress triaxiality near crack fronts in compact tension specimens of hydrided irradiated Zr-2.5Nb materials with split circumferential hydrides is investigated by three-dimensional finite element analyses. The results indicate that plastic strain concentration is observed in the middle of the ligaments ahead of the crack front. A strain-Based Failure Criterion with consideration of stress triaxiality is developed from the Gurson yield model. With the Failure Criterion, the necessary fraction of the load for crack initiation is about 0.60–0.70 to fracture the ligaments when compared to that for a CT specimen without split circumferential hydrides.
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Three-Dimensional Finite Element Analyses of Thin-Sliced Compact Tension Specimens of Irradiated Zr-2.5Nb Materials With Consideration of Split Circumferential Hydrides
Volume 6A: Materials and Fabrication, 2016Co-Authors: Shin Jang Sung, Jwo Pan, Poh Sang Lam, Douglas A. ScarthAbstract:In this paper, the low energy mode associated with split circumferential hydrides is examined by conducting three-dimensional finite element analyses of thin-sliced compact tension (CT) specimens of irradiated Zr-2.5Nb materials with split circumferential hydrides. Finite element models of thin-sliced CT specimens with split circumferential hydrides and various slice thicknesses are developed with the assumption of the plane strain condition in the thickness direction except in the split circumferential hydride regions. The computational results indicate that with split circumferential hydrides, the crack tip opening displacement (CTOD) can increase 50% for thinner thin-sliced specimens under the same load per unit thickness. With the use of a strain-Based Failure Criterion with split circumferential hydrides, the load per unit thickness for thinner thin-sliced specimens can reduce by at most 70% to meet the Failure Criterion.
Soemsak Yooyen - One of the best experts on this subject based on the ideXlab platform.
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A Novel Stress Tensor-Based Failure Criterion for Peridynamics
Proceedings, 2020Co-Authors: Daniele Dipasquale, Arman Shojaei, Soemsak YooyenAbstract:Peridynamic theory has recently shown to be a versatile tool for simulating complex phenomena related to the fracture and fragmentation of structural and composite materials. We introduce a novel Failure Criterion Based on the classic stress tensor which takes inspiration from an approach proposed in the literature. Differently from the classic critical stretch-Based Failure Criterion used in peridynamics, our approach takes into account the total elastic energy stored in the bond allowing to predict with more accuracy problems that involve mixed-mode I-II fracture. In order to show the effectiveness of the proposed Failure Criterion, a benchmark fracture problem is analyzed showing a good agreement with the experimental results and the numerical results obtained with other numerical methods.
P. Wung - One of the best experts on this subject based on the ideXlab platform.
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A force-Based Failure Criterion for spot weld design
Experimental Mechanics, 2001Co-Authors: P. WungAbstract:This paper suggests a very simple, force-Based formula that combines four Failure modes into one dimensionless equation to govern spot weld Failure under general static loading conditions. The four Failure modes are shear, rotation, normal and peel. The normal separation mode and the peel mode are corresponding to mode I (opening mode). The tensile/shear mode is mode II (sliding mode), and the in-plane rotation mode is mode III (tearing mode). Test coupons and test fixtures are designed and tested to establish and verify this equation. To further verify this equation, a long difficult to understand automotive spot weld Failure problem was studied. Applying finite element-calculated resultant loads to the proposed formula resulted in analytical values that correlated very well with the long time field observed spot weld Failures. This analytical prediction reasonably explained the spot weld Failure mechanism and provided good design directions to improve the durability of the auto structure.
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Failure of spot welds under in-plane static loading
Experimental Mechanics, 2001Co-Authors: P. Wung, T. Walsh, A. Ourchane, W. Stewart, M. JieAbstract:Under in-plane loading conditions, two independent modes contribute to the Failure of a spot weld: the in-plane shear mode and the in-plane rotational mode. In this work, the Failures of both modes under large static load are examined individually. To study the combined Failure of these two modes, two special test coupons are designed. The first coupon contains one spot weld. The second coupon contains five spot welds. Tests conducted in this work show that a very simple force-Based Failure Criterion can be used to predict the Failure of a spot weld under large in-plane combined static loads. Current multiaxial Failure theory cannot explain this combined Failure. This force-Based spot weld Failure Criterion fits current automotive industry needs for body shell finite element application very well.