Global ETD Search
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 232 for “"yield strength"”.
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Optimal fiber yield strength for concrete reinforcement
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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The yield strength of molybdenum under pressure and temperature
… This allowed for the determination of the yield strength of molybdenum under extreme conditions. The results indicate that molybdenum’s yield strength increases from 0 GPa to 20 GPa and decreases from 293 K to 423 K.
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Triptycene side unit effects on compressive yield strength in polycarbonates
… polycarbonates had higher compressive yield strengths than non-triptycene polycarbonates. The polymers were stronger due to the interlocking mechanism and the steric hindrance of the triptycene units. The design of strengthening polymers by adding triptycene units could prove useful to …
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Fabrication and Compressive Yield Strength of Open Cell Corrugated Cellular Solids
… thesis studied the fabrication and compressive yield strength of open cell corrugated cellular solids made from type 304 stainless steel. Test samples were made by corrugating woven wire meshes, then laminating these in a high temperature argon environment. Mesh sizes ranging from 9.5 pore/cm …
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Factors contributing to the yield strength of polycrystalline nickel-based superalloys
… properties, in particular, high temperature strength. As we become increasingly aware of the environmental consequences of air travel, manufacturers are striving to improve engine efficiency. This may be achieved by increasing the operating temperature of the engine, however, the limiting …
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Relationships between MIBANT bend angles and selected material properties of pallet fasteners
… impact loaded was used to relate the dynamic yield strength and MIBANT bend angle of driven steel fasteners. Static yield strength values for pallet nails were found to values (p > 0.0001 be linearly related to the dynamic 2 and R² = 0.950) and hence MIBANT bend angles. Static yield strength …
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Influence of Grain Size and Widmanstätten Colonies on Variability of Tensile Properties of Forged Ti-6Al-4V
… for failure was due to lower than necessary yield strength and ultimate tensile strength values, as well as unwanted variability between regions of the part. Therefore, samples of the regions were tensile tested to determine the differences that existed in yield strength, ultimate tensile …
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The Effects of Bolt Spacing on the Performance of Single-Shear Timber Connections Under Reverse-Cyclic Loading
… Billings was unable to consistently produce yield modes III and IV, meaning that her suggested bolt spacing of seven times the bolt diameter (7D) could not be applied to connections subject to these yield modes without further testing. In addition, the work of Anderson and Billings raised …
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Methodology to determine post yield material mechanical properties from spherical indentation
… strain hardening properties, Young's modulus and yield strength. It is noticed that Tabor's empirical formula is valid in the plastic region (deep indentation) with a small percentage error in the calculated values of yield strength. Based on the FE results, strain values have been predicted …
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Pier moment-rotation behavior of high performance steel HPS70W I-girders
… relationship of steel girders with a yield strength exceeding 50 ksi is prohibited. Though, bridge designers are currently allowed to go to plastic moment for I-shape girders having a yield strength of 70 ksi. The second restriction is that the AASHTO LRFD inelastic design methods …
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An investigation of FRP reinforced glulam bolted connections
… due to its lack of homogeneity and low strength compared to steel and concrete. Wood can become a more versatile material if used with Fiber Reinforced Polymers (FRP) to form a composite. This thesis presents the results of an investigation of the increase in yield strength, ultimate …
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Beam behaviour of hybrid steel sections
… codes apply only to steel grades with specified yield strength less than 460MPa. The purpose of the research was, firstly, to examine the development of stresses and strains within the flanges and web in order to establish how this differs from that in homogeneous members. It was also necessary …
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Processing, Microstructural And Mechanical Characterization Of Mechanically Alloyed Al-al2o3 Nanocomposites
… the stress-strain response, elastic modulus and yield strength of the composites was investigated. Nanoindentation and compression tests were performed to characterize the composite material. Yield strength of 515 MPa, compressive strength of 685 MPa and elastic modulus of 36 GPa were obtained …
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Indentation of plastically graded materials
… a comprehensive understanding of the effects of yield strength and strain hardening exponent on frictionless normal indentation. To date, however, systematic studies of plasticity gradient effects on indentation response have not been completed. A comprehensive parametric study of the mechanics …
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Biodegradable polymer scaffold fabrication and the creation of tissue-engineered bone
… microspheres. These PLGA foams had insufficient yield strength in compression. However, the results served as a basis for the design of foams with mechanical properties suitable for bone regeneration. As a means of enhancing foam compressive strength, this processing technique was modified to …
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The influence of nitrogen on the deformation behaviour of a modified AISI type 200 series alloy
… uniaxial tensile testing. The room temperature yield strength was shown to decrease with increasing nitrogen content for nitrogen contents less than 0.1 wt%. This decrease was attributed to the presence of secondary phases in the annealed state. An increase in yield strength was observed with …
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Characterization of Material’s Elastic-plastic Properties Through Microindentation Testing with a Cylindrical Flat-tip Indenter
… indenter will be used to find the material yield strength based on the load-depth graph. Specimens being tested are 6061T6 AISI 4340 and AISI 1018 steel. The tensile tests for the same materials are undergone to find the elastic modulus, yield strength, stress-strain relationship. The …
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Seismic Behavior of concrete filled steel Tubular Built-up columns
… local buckling, higher compressive and flexural strength, earthquake and fire resistance, rapid construction, savings in the construction costs, etc. CFST built-up columns are increasing adopted in structural members with larger load eccentricity ratio and slenderness ratio, such as stadium, …
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Microstructure-based Constitutive Models for Residual Mechanical Behavior of Aluminum Alloys after Fire Exposure
… (i) microstructural evolution, (ii) residual yield strength, and (iii) strain hardening after fire exposure. The AA5083-H116 constitutive model was developed considering the microstructural processes of recovery and recrystallization. The residual yield strength was calculated considering …
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