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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"in-plane shear"”.
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In-Plane Shear Wall Performance As Affected by Compressed Earth Block Shape
<p>This thesis investigates the in-plane shear performance of full-scale walls made from compressed earth blocks. Compressed earth blocks are a type of masonry where the blocks are composed of compressed soil and typically dry-stacked without mortar. Prior research has demonstrated that the …
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Experimental and Analytical Evaluation of FRP-Retrofitted Reinforced Concrete Diaphragms for In-Plane Shear Strengthening
… component of the horizontal lateral force resisting system (hLFRS) in a reinforced concrete (RC) structure and are crucial for providing sufficient load path to the vertical lateral force resisting system (vLFRS). Diaphragms may require retrofit due to the relocation of vLFRS elements during …
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Plug repairs of marine glass fiber / vinyl ester laminates subjected to in-plane shear stress or in-plane bending moment
Glass fiber / vinyl ester composite laminates represent an important class of modem fiber composites being proposed or used in state-of-the-art shipbuilding. This thesis examined the effectiveness of chopped strand mat (CSM) plug repairs of glass fiber / vinyl ester woven roving laminates subjected …
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A study of tension, compression, and shear test methods for advanced composites
A study of the literature pertaining to test methods for advanced composite materials has been carried out. Several test methods were discussed and compared for each of three areas of interest. These areas were uniaxial tension, uniaxial compression and in-plane shear. Test methods were selected …
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Modelling Reinforced and Prestressed Concrete Structures Subjected to Shear and Torsion
In the design and analysis of reinforced and prestressed concrete structures, engineers are often faced with complex loading conditions that require the assessment of members subjected to shear and torsion. To develop a better understanding of the behaviour of such structures, twelve shell element …
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Thermal and fatigue testing of fiber reinforced polymer tie connectors used in concrete sandwich walls
… purpose of this research program was to determine the strength, strain, fatigue, temperature, and other corresponding behavioral characteristics of concrete sandwich wall panels containing the new Delta TieRTM fiber reinforced polymer (FRP) tie connector produced by Dayton/Richmond, a brand of …
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Modeling of sheet metal fracture for shell finite elements with component level validation
Ductile fracture causing premature failure of parts during forming and crash has become an important factor limiting design of car bodies. The increasing usage of advanced high strength steels and other lightweight materials to meet ever-stringent standards on passenger safety and gas emissions …
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Interlaminar stress analysis of dropped-ply laminated plates and shells by a mixed method
… approximation based on Reissner's variational principle is developed for the linear analysis of interlaminar stresses in laminated composites, with special interest in laminates that contain terminated internal plies (dropped-ply laminates). Two models are derived, one for problems of generalized …
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Investigation of deformation and failure mechanisms in woven and nonwoven fabrics under quasi-static loading conditions
… ballistic woven and nonwoven fabrics under in- plane quasi-static loading conditions have been investigated. The investigations focused on the responses of fabrics at the mesostructural level as well as at the macroscopic level under uniaxial tensile and in-plane shear modes of deformation. …
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On The Shear Strength Of Partially Grouted Concrete Masonry
Masonry shear walls are one of the most common structural elements in buildings. The in-plane shear capacity of load-bearing walls is of great importance in the seismic design of structures. This study focuses on the shear behaviour of wide-spaced reinforced partially grouted (WRPG) concrete …
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Stress-mediated reaction pathways for dislocation nucleation in copper
… either homogeneous or heterogeneous sources, in order to produce the large number of dislocations necessary for extensive plastic deformation. As with the majority of the defect processes that comprise deformation and failure of materials, dislocation nucleation is well described in the …
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New in-plane and interlaminar shear test methods for fiber reinforced composites
A new compact double-notched specimen for in-plane shear testing of isotropic, anisotropic and composite materials was developed. A preliminary test of the specimen was performed on a cross-ply laminate. High sensitivity moire interferometry was used to determine the shear and normal strains on the …
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Optimal design and testing of laminated specimens to evaluate competing composite failure criteria
Optimization methods are used to find areas of maximum disagreement between the failure criteria of Tsai and Hart-Smith. The Tsai criterion is quadratic in the stresses and employs a selective and progressive ply-by-ply degradation scheme to predict ultimate load. Hart-Smith’s criterion is based on …
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Mechanical response of unidirectional Boron/Aluminum under combined loading
… the response of unidirectional Boron/Aluminum metal matrix composite material under monotonic and cyclic loading conditions, namely: Iosipescu Shear, Off-Axis Tension and Compression. The characterization of the elastic and plastic response includes the elastic material properties, …
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Analysis of shear test methods for composite laminates
An elastic plane stress finite element analysis of the stress distributions in four flat test specimens for in-plane shear response of composite materials subjected to mechanical or thermal loads is presented. The shear test specimens investigated include: slotted coupon, cross beam, Iosipescu, and …
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Compressive failure of notched angle-ply composite laminates: three-dimensional finite element analysis and experiment
Five angle-ply laminates ([0₄₈], [(±10)₁₂]<sub>s</sub>, [(±20)₁₂]<sub>s</sub>, [(±30)₁₂]<sub>s</sub>, and [(±45)₁₂]<sub>s</sub> with central circular holes were tested under uniaxial compressive loading. The results from these tests show that the [(±45)₁₂]<sub>s</sub> laminate exhibited plastic …
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Experimental and theoretical study of encased-plate composite structural walls
Reinforced concrete and steel plate structural walls have been widely used as lateral-load resisting systems in multi-storey buildings. However, they have a number of shortfalls which could be mitigated if a composite construction consisting of steel plates and concrete is used. The encased-plate …
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Nonlinear Finite Element Analysis of Laminated Composite Beams Subjected to Harmonic Excitations Using a 20 DOF Beam Element
<p>The purpose of this thesis is to study the nonlinear analysis of antisymmetrically laminated composite beams including shear deformation subjected to harmonic excitation, using a 20-degree of freedom finite element beam. The beam has 10 degrees of freedom at each node: The axial displacements, …
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Analysis of Tow-Placed, Variable-Stiffness Laminates
It is possible to create laminae that have spatially varying fiber orientation with a tow placement machine. A laminate which is composed of such plies will have stiffness properties which vary as a function of position. Previous work had modelled such variable-stiffness laminae by taking a …
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Development of Drape Simulation Software and the Optimisation of Variable-Length Textiles
The group of manufacturing methods known as Liquid Composite Moulding (LCM) is becoming the industry standard for Polymer Matrix Composite (PMC) production. These processes are versatile and cost-effective, but they are extremely dependant on the availability of textile preforms offering good …
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