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Even the strongest and hardest-working materials on earth - pipes, drills, munitions, girders - crack. A crack is the beginning of failure, but when and how dramatically will the failure occur
The world demands more-greater quantities of energy, taller buildings, longer pipelines, faster and higher-flying aircraft. Material scientists have responded with stronger and more durable metals, but every one, given the right set of circumstances, will crack.
Crack Tip Opening Displacement test or CTOD is one of a family of fracture mechanics tests that measures the resistance of a material to growing a crack. Similar tests (i.e., da/DN, K1C, KEE, and J1C) can determine fracture resistance of a material, but CTODis particularly suited to pipeline and drilling equipment. The CTOD test is used to determine the fracture mechanics properties of ductile materials and can be thought of as the simulated opening of a pre-existing fatigue crack prior to fracture. The data that result from this opening can be used for critical defect assessment, in which the critical defect size can be determined.
The calculation of the final CTOD value is dependent on the depth of a pre-fatigue crack from the surface of the specimen. As it is impractical to fatigue a crack from the actual specimen surface, the specimen is machined to include a notch, which will act as the initiation point of the fatigue crack and be included in the overall length of the fatigue crack used for the calculation of the CTOD value.
On completion of machining of the specimen, an actual fatigue crack is induced at the base of the starter notch. This crack must be of sufficient length to bypass any area of plastic deformation that may have been occurred during the machining process. The crack length is typically based on the size of the sample, the method of notch manufacture, the width of the notch, the shape of the notch, and practical time restraints. The overall length from the surface of the sample to the crack tip must fall within given parameters. Other factors that also must be considered include the angle of the crack in respect to the specimen and the difference in length of the crack as seen on the exposed surfaces. The operation is typically performed in air at room temperature.
Fatiguing the sample requires a minimum and maximum fatigue load. If the loads selected to induce the fatigue crack are too low, then the fatigue time may become restrictive-or, at the extreme, a crack may not develop. If the loads are too high, then a plastic zone may result which would affect the CTOD result-or, again at the extreme, the sample may fracture prematurely. The national standards specify criteria to ensure a valid test sample, including: a minimum to maximum load ratio of less than 0.1, a change in stress intensity relating to the modulus of the material, and a maximum load based on the material tensile properties, specimen size and span used.
Initiation and propagation of a fatigue crack is dependent on the configuration of the sample, the crack length and the loading conditions. This relationship determines the stress intensity factor (K) at the fatigue crack tip, and can be determined for a three-point bend by the following formula:
It is possible to combine aspects of the three methods to further increase to efficiencies of the crack propagation. By starting with a high K and reducing it as the crack extends, one can reduce the time necessary to grow a crack while keeping within the specification requirements.
While performing the fatigue operation, it is important to remember that only the outer surface can be measured and confirmed. The fatigue is propagating across a plane inside the sample, and as such the length cannot be visually confirmed until the test is complete and the sample fractured open. The compliance and potential drop techniques can provide information about the internal situation of the fatigue crack.
Variance in length across the fatigue crack front increases in materials in which an even stress distribution is not present, i.e. in a weldment. In these cases, various operations may be necessary to produce a linear crack front. Precompression of the sides of the sample and reverse bending are two of the most common techniques employed.
On completion of the fatigue operation, the visible crack front must be visually examined to ensure compliance to the specification, e.g. within length tolerances from the surface and between sides, straightness and the absence of any obvious surface bifurcations.
The rate of testing is determined by the change in the stress intensity factor during the initial application of load. As was seen in the equation, the stress intensity is dependent on the load and crack length. Since the crack length is not measurable until the sample is fractured, it is not possible to confirm the actual testing rate until completion of the test. An estimated crack length must be used to determine the testing rate-with the actual test rate confirmed to be with in the validation limits.
As with the Reading section, the lectures will focus on something to do with academia, but the test-taker does not need a prior knowledge of the material in order to get the right answer. That said, it can be quite challenging because you only get one crack at hearing and understanding what the participants in both the conversations and the lectures have to say. You can and should take notes while listening because you will have the opportunity to look over those as you answer each question. Questions are designed to measure your understanding of main ideas, implications, relationships between ideas, important details, speaker purpose, organization of information and speaker attitude.
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Branch Street is an important commercial corridor of the Lower Highlands neighborhood and one of the most important for the City of Lowell. Nevertheless, there are challenges with pedestrian safety and ADA accessibility, faded and uneven crosswalks, cracked and damaged sidewalks, insufficient signage at mid-block crossings, and a high crash record in specific points throughout the entire corridor. The goal of the Branch Street project is to enhance the physical environment of a portion of Branch Street and Middlesex Street by improving its sidewalks, streetscape, and roadways that connect the Park with services and amenities used by the community to encourage walkability around the area and promote physical activity. 153554b96e
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