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 24 for “"fracture test"”.
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The development of the peninsula blister fracture test for adhesively bonded joints
… and application of the peninsula blister test to quantitatively measure the adhesion of various adhesively bonded joints. Analytical results reveal that this peninsula-like geometry benefits from both a constant strain energy release rate over the major portion of the debond length and a …
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Development of the Strain-To-Fracture Test to Study Ductility-Dip Cracking in Austenitic Alloys
The strain to fracture test has been developed as a robust testing technique for ductility-dip cracking (DDC) and other elevated temperature cracking phenomenon. Samples are tested over a range of temperature and strain, producing temperature-strain cracking envelopes. Threshold strain for fracture …
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The notched coating adhesion specimen: a fracture test for coatings and accelerated screening test for adhesion
A simple adhesion test method is proposed to provide estimates of the debond toughness of adhesive bonds. Notched coating adhesion (NCA) specimens consist of single substrates coated with thin layers of adhesive. The coating is notched to induce initial debonds, and the specimen is then loaded in a …
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Fatigue-fracture relation on asphalt concrete mixtures
… potential relationships between fatigue and fracture parameters obtained from standardized laboratory tests. A flexural bending beam test was used to obtain two fatigue parameters, which include a traditional fatigue criterion based on stress or strain to find number of cycles to failure and …
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Properties of functionally graded concrete slabs
… project examined the feasibility of developing a fracture test that was easy to perform in the field. The standard fracture test involves using a three-point beam setup (SEN(B)). The SEN(B) geometry is extremely difficult and time consuming to extract from the field and so a circular specimen, …
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Effect of Weld Strength Mismatch on Elastic-Plastic Fracture Parameters
… the fundamental quantities needed to derive fracture mechanics parameters. Equations in existing fracture test standards which relate J (and CTOD) to measurable quantities (i.e. load, plastic work, plastic displacement) are investigated for single edge notch bend, SE(B), specimens to …
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Experimental investigation of tearing fracture in sheets under quasi-static loading
… of the dynamic blast event, or "live fire" tests. New developments in methods of recreating blast and projectile induced plate failure using a quasi-static approach provide possible, accurate, alternatives to the cumbersome and expensive live fire test. This research endeavors to develop an …
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Development of bimodal grain structures and their effect on toughness in HSLA steel
… the local recrystallisation kinetics. Notch-bend fracture tests were performed at –160 °C to investigate the effect of a bimodal grain size distribution on fracture toughness by comparing local fracture stress values for uniformly fine, uniformly coarse and bimodal ferrite grain structures. …
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An Evaluation of the Durability of Polymer Concrete Bonds to Aluminum Bridge Decks
… wearing surface. A modified mixed mode flexure fracture test was developed to assess the bond durability of specimens aged in the following environmental conditionings: 30°C [86°F], 98% RH; 45°C [113°F], 98% RH; 60°C [140°F], 98% RH; freezing and thawing; salt (NaCl) water soak; and 60°C …
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Evaluation of efficiency of partial hybrid finite element method using composite laminates with crack
… based on both a strength-based criterion and a fracture mechanics approach are in good agreement with the experimental data. It is found that the symmetric notched flexure (SNF) specimen used in the study of interior delamination is quite promising for Mode-II fracture test. In view of having no …
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Crack Path Bifurcation at a Tear Strap in a Pressurized Stiffened Cylindrical Shell
A finite element model of a fracture test specimen is developed using the STAGS computer code (STructural Analysis of General Shells). The test specimen was an internally pressurized, aluminum cylindrical shell reinforced with two externally bonded aluminum tear straps around its circumference. The …
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Mechanical behaviour and fracture toughness of unfilled and short fibre filled polypropylene both drawn and undrawn. Experimental investigation the effect of fibre content and draw ratio on the mechanical properties of unfilled and short glass fibre filled polypropylene
… to ¿=5.6. Mechanical characterization of the test materials has been conducted by examining the tensile stress strain and fracture behaviour under uniaxial conditions. The influence of glass fibre content and drawing conditions (draw ratio) on the fracture toughness and crack propagation was …
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Cohesive zone modeling of fracture of sustainable and functionally graded concrete
… other design requirements such as ductility, fracture resistance, thermal resistance/insulation, etc. Functionally graded materials (FGMs) are one such material. This study investigates the fracture process of sustainable concrete, fiber reinforced concrete, and of functionally graded concrete …
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Dual-Use Strain Sensors for Simultaneous Strain Measurement and Acoustic Source Location
… such as Hsu-Nielsen pencil lead break (PLB) tests, or natural sources such as quasi-static fracture or crack propagation. This type of evaluation has significant advantages over other types of damage inspections such as liquid die penetrant, Blue Light, Eddy Current, or X-ray inspections …
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Experimental evaluation of monotonic and cyclic fracture behavior using disk-shaped compact tension test and released energy approach
This thesis involves the evaluation of fracture behavior of asphalt concrete under monotonic and cyclic loading using the disk-shaped compact tension (DC(T)) test and a released-energy based approach. The standard DC(T) test was revised to facilitate both monotonic and cyclic loading tests, …
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Creep and fracture of self-consolidating concrete incorporating fly ash
… this study is focused on investigating creep and fracture toughness of SCC. Furthermore, we compare creep and fracture toughness of SCC with that of normal vibrated concrete (NVC) typically used in bridge applications in New Mexico. Five different SCC mixes were designed using two different New …
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A study of blister tests for film adhesion measurement and fracture efficiency of tests for adhesive bonds
A novel concept, the fracture efficiency, is proposed in this dissertation as a performance index of fracture specimen designs for adhesive bonds. Evaluated based on a simple quantity, the fracture efficiency parameter, the fracture efficiency represents how much crack driving force a certain …
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Dynamic Fracture of Adhesively Bonded Composite Structures Using Cohesive Zone Models
Using experimental data obtained from standard fracture test configurations, theoretical and numerical tools are developed to mathematically describe non-self-similar progression of cracks without specifying an initial crack. A cohesive-decohesive zone model, similar to the cohesive zone model …
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Fracture characterization of thin bonded asphalt concrete overlay systems
… benefits. Conventional asphalt concrete fracture tests were developed for pavements with homogeneous asphalt concrete mixtures, and typically their thicknesses exceed two inches. The use of spray paver technology for construction of TBO leads to continuously varying asphalt binder …
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Effect of strain rates on tensile properties and fracture toughness determination of extruded Mg-Al-Zn alloys
… rates of extruded magnesium alloys and their fracture behaviour are some of the important parameters to be considered in design in ensuring the durability and reliability of automobile structures. In this study, the effect of strain rates on tensile properties and work hardening behaviour were …
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