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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 24 for “"Charpy impact"”.
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Effects of microstructure and strain ageing on toughness of nuclear PWR reactor weld metals
… prestrained and then statically strain aged. Charpy impact transition curves had obvious trends depending upon microstructure and condition, with microstructure having a significant influence on the transition region and upper-shelf impact energy level. Prestraining and ageing the specimens …
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Low Temperature Cleavage Fracture of Microalloyed Bainitic Plate Steels
… and acicular ferrite) and EBSD 15° domain size. Charpy impact tests (using two notch orientations) were carried out over a range of temperatures. Cleavage facet sizes were measured on -196°C Charpy samples. The range of TMP schedules produced variations in PAG width, type of bainite and 15° …
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Effects of thermal aging on Stress Corrosion Cracking and mechanical properties of stainless steel weld metals
… tensile, micro-hardness, nano-hardness, Jic, and Charpy-impact toughness) was in process and initial results show an increase in yield strength and a decrease in fracture toughness after aging for 1000 hours at 430 and 400 *C. Thermal aging results in no discernable changes to the 6-ferrite …
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Static and Dynamic Characterisation of Flax Fibre-reinforced Polypropylene Composites
… using various mechanical (tensile, flexural and impact (Charpy impact and drop weight impact)) and dynamic (dynamic mechanical analysis (DMA) and impact hammer technique (IHT)) analyses, respectively. The mechanical properties of the composites are strongly affected by fibre orientation with …
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Microstructure and Mechanical Properties of WE43 Alloy Produced Via Additive Friction Stir Technology
… in the T5 condition. The toughness measured by Charpy impact testing also showed an increase over the base material. The relationships among tensile properties, Vickers microhardness, impact toughness, microstructure and thermal history are developed and discussed.
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Investigation of cork as filler for fiber-reinforced composite material in kayaks
… a three-point bending test (ASTM D79o) and a Charpy impact test (ASTM D611o) to investigate maximum flexural stress, effective elastic modulus, and impact resistance. Fiberglass-epoxy samples serve as the control for comparing the results of the cork composite samples. The average flexural …
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An investigation of the failure mechanisms of thermoplastic composites at various rates of strain and temperatures
… 6-6 were tested in tension, flexure and impact (lzod, Charpy and drop-weight). Two different injection-moulding machines were used for specimen manufacture. These were an automated injection moulding machine simulating good control of processing conditions and a simple hand operated …
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The effect of chemical treatment, fibre length, fibre content and injection moulding parameters to uv irradiation resistance of oil palm fibre reinforced composites
… maximum stress, break stress, break strain and Charpy Impact strength based on six different UV exposure time i.e.: 0, 96, 336, 504, 1008, and 1512 hours. The significance of the regression models were tested by Analysis Of Variance (ANOVA) and verified by two expose time i.e: 168 and 672 hours. …
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Phase transformations in welded supermartensitic stainless steels
… to be more prone to δ- ferrite retention. Charpy impact toughness tests performed on simulated heat-affected zones revealed a weak effect of δ-ferrite on the HAZ ductile to brittle transition temperature. In fact, due to its larger grain size, the coarse-grained HAZ determined the impact …
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Characterization and development of polycaprolactone (PCL)/montmorillonite (MMT)/hydroxapaptite (HA) nano-composites for fused deposition modelling (FDM) process
… were assessed by tensile, flexural and charpy impact tests while the thermal properties were studied via differential scanning calorimetry (DSC) and thermogravimetry analyzer (TGA). Simulated body fluid (SBF) test was used to assess the bioactivity properties of the composites. The …
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NEW GENERATION POLYMER CONCRETE INCORPORATING CARBON NANOTUBES
… also examined the dynamic response of PC using Charpy impact and low-velocity impact tests. Furthermore, the bond strength between steel plates and PC overlays was evaluated. This included performing the pull-off and slant shear tests. Moreover, four-point bending fatigue test was performed to …
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Characterisation of metallurgical and mechanical properties of friction stir welded low alloy steels for marine applications
… characterisation, transverse tensile testing, Charpy impact testing and hardness measurements. A preliminary process parameter envelope has been developed and parameter sets established that deliver high integrity welds and enhance the process's techno-economic competitiveness through a step …
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Fatigue and Fracture of Electron Beam Melting Ti-6Al-4V
… mass fraction (0.13 % to 0.47 %) by performing Charpy impact testing and resistance curve (<em>J-R</em>) testing to determine fracture toughness, all while including the effects of specimen orientation and HIP post-processing. The fracture trends showed significant reduction in toughness at the …
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Experimental investigation of structure, composition and properties of novel metal-carbon covetic materials
… ultimate tensile strength, and elongation), Charpy impact test (energy absorption), nanoindentation (elastic modulus and hardness) and Vickers and Rockwell methods (hardness). Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) were used to analyze the structure of these materials. …
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Development of the small punch test platform to evaluate the embrittlement of power plant materials
… aid in structural integrity assessments, such as impact energy, tensile and hardness testing. Through empirical correlations, these test results are used to estimate fracture toughness properties and, consequently, the error bands are expected to be as high as 50%. Due to its small size, the small …
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Influence of crystallographic texture in X70 pipeline steels on toughness anisotropy and delamination
… and anisotropic characteristics. Tensile and Charpy impact testing were used to evaluate the mechanical properties in three orientations: longitudinal (L), transverse (T) and diagonal (D) with respect to the rolling direction to evaluate mechanical property anisotropy. The yield and tensile …
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Influences on nanocomposite structural performance: experimental study on materials processing and bonding
… behaviour and<br/>showed greatest improvement in Charpy impact toughness. Fibre reinforced composites<br/>laminates have also been investigated by enhancing a formulated pre-preg material.<br/>Compressive properties and interlaminar shear stress were tested in a woven carbon fibre<br/>composite …
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Understanding toughness and ductility in novel steels with mixed microstructures
… concentration present at the notch root of a Charpy impact sample. The work provides evidence of notch root embrittlement due to stress-induced martensite transformation. Results from synchrotron and laboratory X-ray experiments in particular reveal that machining, as well as applied stress, …
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Weldability and hydrogen relationships in super duplex stainless steel.
… may change other mechanical properties, such as charpy impact toughness, elongation, and reduction in area of these materials.
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Bonding of additives to functional polyolefins by reactive blending
… These findings were complemented by results from Charpy impact tests. The mechanical property results indicated that the longevity of the materials with UV stabilisers grafted to them exceeded the PPg- MA system where there was no stabiliser present. Visible spectrophotometry was used to assess …
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