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  • 1
    Electronic Resource
    Electronic Resource
    Study of Three-Dimensional Stress Distribution and Damage Characterization of Bolt Composite Joint (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 395-398 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A 3D finite element model of bolt composite joint has been established to determine thestress distribution on the contact surface. The effects of clamping torque and friction on the contactstress and interlaminar normal stress are considered. From the analysis results, contact stress is baredmainly by the 0° layer. The distribution and magnitude of contact stress are conducted by friction.The effect of clamping torque on interlaminar normal stress is very strong. A 3D damage usersubroutine is added to the FEM to simulate the damage of joint. By the means of damage simulation,the initiation and progression direction of three types damage are predicted. Matrix cracking andfiber-matrix shear occur at first, and fiber buckling is founded subsequently. The matrix cracking andfiber-matrix debonding initiate at circumferential angle 45°and 135°, and fiber buckling initiate at the0° layer on the bearing plane. The friction and bolt clamping torque can restrain damage initiationand development
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.395.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Compressive Experiment and Damage Simulation of a Composite Structure with Ply Drop-Off (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 301-304 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Compressive experiments and finite element method (FEM) have been used to study themechanical behavior of composite laminate with plies drop-off. A user subroutine has beenimplemented to ABAQUS to simulate the damage development of the laminate plate. This usersubroutine has taken consideration of the mechanical properties degradation according todevelopment of three types of damage. The load-strain curves can agree with each other betweenexperiments and FEM. The detail of damage development of the plies drop-off composite laminateunder compressive loading can be described as followed. Matrix cracking damage and fiber-matrixshearing damage occur simultaneously at first, and then fiber buckling damage initiates. Matrixcracking and fiber-matrix shearing are very dangerous to the carrying capacity of laminate and fiberbuckling intensifies further this effect. The initiation and development of fiber buckling indicatesthat laminate loses carrying capacity at all
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.301.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Finite Element Analysis of Creep Damage Behavior Near the Cavity on Bimaterial Interface (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 951-954 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Fracture along an interface between materials plays a major role in failure of material. Inthis investigation, finite element calculations with Kachanov–Rabotnov damage law were carriedout to study the creep damage distribution near the interface cavity in bimaterial specimens. Thespecimens with central hole were divided into three types. The material parameters of K-R law usedin this paper were chosen for a brittle material and ductile material. All calculations were performedunder four load cases. Due to the difference between elastic moduli of the bounded materials, theelastic stress field as a function of the Young’s modulus ratio (R=E1/E2) was determined. At thesame time, the influence of model type on elastic stress distribution near the cavity was considered.Under the same conditions, the material with larger modulus is subjected to larger stress. The creepdamage calculations show that the location of the maximum damage is different for each model.The distributions of creep damage for all three models are dependent on the material properties andload cases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.951.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental and FEM Analysis of the Fracture Behavior in NiTi Shape Memory Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 919-922 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present work, the fracture toughness of a NiTi pseudoelastic alloy has beenobtained by experiments on CT specimens, which is KIC =39.38MPa·m1/2. Then the stress inducedphase transformation behavior in front of the crack tip of the CT specimen is simulated by amicromechanical model considering the different elastic properties between martensite andaustenite. The results show that the pre-crack promotes phase transformation at the crack tip. Andthe phase transformation is localised near the crack tip. It is also shown that phase transformationreduces the Mises stress around the crack tip
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.919.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Numerical Study on Elastic-Plastic Stress Field Near the Cooling Holes of Nickel-Based Single Crystal Air-Cooled Blades (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 563-566 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, a plate containing a central hole was used to simulate gas turbine blade withcooling hole[removed info]. Numerical calculations based on crystal plasticity theory have been performed to studythe elastic-plastic stress field near the hole under tension. Two crystallographic orientations [001] and[111] were considered. The distributions of resolved shear stresses and strains of the octahedral slipsystems {110}〈112〉 were calculated. The results show that the crystallographic orientation hasremarkable influence on both von Mises stress and resolved shear stress distributions. The resolvedshear stress distributions around the hole are different between the two orientations, which lead to thedifferent activated slip systems. So the deformed shape of the hole in [001] orientation differs fromthat in [111] orientation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.563.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of Interlaminar Stresses and Failure around Hole Edge for Composite Laminates under In-Plane Loading (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1027-1030 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The stress characterization around the hole in a composite plate under tensile stress hasbeen studied by the analytical method in this paper. The distribution of the stress components hasbeen presented. With the Hashin Failure Criterion, the failure characterization and different failuremodes by the analytical method and finite element method are then studied. The possibility of thefailure in different modes is compared. It is found that the fiber breakage, matrix failure anddelamination are dominant. The place of the failure is between 70 degree and 90 degree to theloading direction in this paper. The results from analytical method and finite element method canagree with each other. And they are all confirmed by the experiment results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1027.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and In Vitro Bioactivity of Si Enriched Hydroxyapatite/TiO〈sub〉2〈/sub〉Coatings on Pure Titanium by Micro-Arc Oxidation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1596-1598 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of Si doping on the bioactivity and characteristics of hydroxyapatite/TiO2 compositefilms was investigated. Pure titanium plates were treated to form Ca, P and Si enriched titania-based filmsby using micro-arc oxidation (MAO). Then, some specimens were undergone a further hydrothermaltreatment to produce a thin outermost layer of hydroxyapatite (HA). Experiments revealed that that thefilm, which was about 10μm thick, was composed of amorphous silicon dioxide, amorphous calciumphosphate, rutile and anatase. The film was porous and uneven, with the pore size of 1-4μm. No obviouscracks exist on the surface. In order to investigate the cytocompatibility of the films, periodontal ligament(PDL) cells were seeded onto the surface of the films. It was concluded that the Si ion did not influencethe characters of MAO film but Si enriched hydroxyapatite/ TiO2 composite coatings exhibited an effecton cell attachment
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1596.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Experiment and FEM Simulation on Residual Stress of Cold Expansion Hole (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1783-1786 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A 2D cylindrical plate model has been established to study the distribution of residualstress of cold expansion hole under different interference values. In addition, the effects of materialmodels on residual stress fields are considered also. Experiments are carried out to measure theresidual stress of cold expansion hole and verify simulation results. FEM results show, withinterference values increasing, the higher residual radial and circumferential stresses are obtained. Atsame interference value, the residual stress of Hardening Material( HM ) model is much larger thanthat of Elastic Perfectly Plastic Material( EPPM ) model
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1783.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    An Amendment Method for Stress and Strain of Double-Curved Laminated Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 757-760 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, an amendment method for stress and strain of double-curved laminatedcomposite is proposed and studied. According to finite element analysis results of the same modelwith two different mesh size (coarse mesh size 120mm× 300mm and refined mesh size30mm× 30mm ), stress and strain have been amended with modified formula in user materialsubroutine (UMAT) subprogram so that the corrected results of model with coarse mesh is similar tothe results of model with refined mesh. Using this method, with coarse mesh, a satisfied accuracyresults still can be obtained without refining mesh. It’s efficient for design and analysis of complexstructures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.757.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Constitutive Relationship and Applications of Shape-Memory Alloys (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 243-244 (July 2003), p. 487-492 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.243-244.487.pdf
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