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.
Results
Showing 1 to 20 of 34 for “"fracture testing"”.
-
Mode I Fracture Testing on Zirconium Foils Under Plane-stress Condition
… to ensure such Zr components operate safely, fracture analysis of Zr alloys has been widely studied. Considering the high cost and difficulties associated with using neutron-irradiated Zr specimens for fracture analysis, proton irradiated testing has been proposed to reduce the cost and …
-
Characterization of Mixed-Mode Fracture Testing of Adhesively Bonded Wood Specimens
… energy release rates (G) for mixed-mode (I/II) fracture of wood adhesive joints. The aims of the study were: (1) quantifying the fracture properties of two material systems, (2) analyzing the aspects that influence the fracture properties of bonded wood, (3) refining test procedures that …
-
Crack Tip Micromaching by Femtosecond Laser for Fracture Testing of Metal Laminates
… cracks for SEM in-situ mini cantilever fracture testing. A parameter space is defined to attempt to capture an acceptable set of laser settings which both reduce the heat affected zone and create an etched geometry mimicking a crack into the sample to facilitate crack propagation in bend …
-
Characterizing the Durability of PF and pMDI Adhesive Wood Composites Through Fracture Testing
… using the double-cantilever beam (DCB) method of fracture testing. The relative durability of phenol-formaldehyde (PF) and isocyanate (pMDI) adhesives was compared using a 2-hour boil test and an environmental test. The feasibility of using oriented strandboard (OSB), oriented strand lumber (OSL) …
-
Aspects of Wood Adhesion: Applications of 13C CP/MAS NMR and Fracture Testing
… A new test geometry for the evaluation of the fracture toughness of wood-adhesive bonds was developed. Consistent and reliable results were obtained. It was found that low molecular weight PF possessed enhanced durability over high molecular weight.
-
The Use of a Tuning Fork and Stethoscope Versus Clinical Fracture Testing in Assessing Possible Fractures
Traditional fracture testing in the field of athletic training relies heavily on subjective responses of the athlete. Percussion and compression type tests rely on the athlete stating an increase in pain which represents a positive symptom of a possible fracture. The tuning fork and stethoscope …
-
Development of a punching technique for ductile fracture testing over a wide range of stress states and strain rates
… methods are not capable of predicting fracture in AHSS, leading to expensive redesign due to poor prediction of stamping and crash worthiness. Many scenarios in which fracture is a concern in automotive applications are in the range of quasi-static through intermediate strain rates (up …
-
Mode-I Fracture in Bonded Wood: Studies of Adhesive Thermal Stability, and of the Effects of Wood Surface Deactivation
… the common theme in each was the use of mode-I fracture testing to evaluate wood adhesion. In the first study, mode-I fracture testing was used to compare the thermal stability of polyurethane (PUR) and resorcinol-formaldehyde (RF) wood adhesives. Bonded specimens for both adhesives were …
-
Examination of Lubrication Effects on Fracture Measurements of Hydrogels via Cutting
Despite cutting being a common process in the fracture of soft materials, there is no well-defined method that can be considered equivalent to some of the more traditional methods of fracture based in tension. A recently developed method by the name of razorblade-initiated fracture testing (RIFT) …
-
Three-Dimensional Mixed-Mode Fracture of the Four-Point Shear Specimen
Traditionally, fracture testing has focused on the fracture toughness of specimens undergoing pure mode I loading, often simplified by 2D assumptions of plane strain or plane stress. In reality, components have finite-thickness, and often see complex loading configurations. To study this complex …
-
Effects of deformation modes on the susceptibility of delayed fracture of advanced high strength steels
… modes on the susceptibility to delayed fracture in advanced high strength steels (AHSSs) were evaluated using four types of commercially-produced sheet steels (DP780, DP980, TRIP780 and TRIP980). Specimens were strained by either uniaxial tension or bending prior to hydrogen charging and …
-
Crack propagation in isotropic materials
… on Gurney and Hunt's quasi-static method of fracture testing.<br/><br/>The applicability of the finite element method of analysis to problems of fracture mechanics is demonstrated for the simple cases where a theoretical solution is obtainable. The comparison of both solutions gives good …
-
Carboxymethylcellulose Acetate Butyrate Water-Dispersions as Renewable Wood Adhesives
… light and fluorescence microscopy, and mode I fracture testing. Thermal analyses showed that the polymer glass transition temperature significantly increased when bonded to wood. CMCAB dispersions produced fairly brittle adhesive-joints; however, it is believed toughness can likely be improved …
-
Investigating the Surface Energy and Bond Performance of Compression Densified Wood
… using opening mode double cantilever beam fracture testing and cyclic boiling of one half of all fracture samples. Phenol formaldehyde film (PF-film) and polymeric diphenylmethane diisocyanate (pMDI) were the two different adhesives used to bond fracture samples. Hygro-thermal samples …
-
Non-destructive evaluation of laboratory scale hydraulic fracturing using acoustic emission
… to develop techniques to characterize hydraulic fractures and fracturing processes using acoustic emission monitoring based on laboratory scale hydraulic fracturing experiments. Individual microcrack AE source characterization is performed to understand the failure mechanisms associated with …
-
Experimentation of Mode I and Mode II Fracture of Uni-Directional Composites and Finite Element Analysis of Mode I Fracture Using Cohesive Contact
… of special non-destructive equipment. Industry testing organizations have utilized several fracture tests in order to characterize the fracture toughness of composite materials under different loading conditions. For this research, ASTM D5528, ASTM D7905 & 4ENF tests were performed to evaluate …
-
An Improved Method for the Fracture Cleavage Testing of Adhesively-Bonded Wood
… describes the development of an improved mode I fracture testing procedure for adhesively-bonded wood, and demonstrates the sensitivity of this approach. The two significant improvements were: 1) the use of the flat double cantilever beam (DCB) geometry, which has been uncommon for wood and 2) …
-
STANDARDS TO CONTROL FRACTURE IN STEEL BRIDGES THROUGH THE USE OF HIGH-TOUGHNESS STEEL AND RATIONAL INSPECTION INTERVALS
… early knowledge was limited regarding fatigue, fracture, and overall system behavior; subsequently, a small number of these structures experienced fatigue and fracture issues leading to the creation of the Fracture Control Plan (FCP). The FCP resulted in more stringent design, material, …
-
Time- and Temperature-Dependence of Fracture Energies Attributed to Copper/Epoxy Bonds
… forces, the need arises to characterize fracture energies corresponding to related, high-speed failure events. Work (or energy) is required to create new surface area—with associated dissipation events—during fracture, and this energy (for a given material system) is dependent on the …
-
Fracture-induced mechanophore activation and solvent healing in poly(methyl methacrylate)
… order to induce this plastic deformation during fracture testing of SP-linked brittle polymers such as poly(methyl methacrylate) (PMMA), rubber nanoparticles can be incorporated into the matrix material. These nanoparticles facilitate the increased shear yielding necessary for SP activation …
Page 1 of 2