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the research group has created a set of fatigue crack growth models that are to be incorporated into the fatigue design software available in the industry. to validate the models, the researchers have created a set of laboratory tests on artificial specimens of bone, spinal fusion plates and artificial hip joints. they claim that by using the proposed models, it will be possible to specify the required cortical thickness and the expected mechanical properties of the device. thus, the designers will be able to determine how much cortical bone should be left intact in the structure. so, in essence, the researchers have succeeded in turning the crack growth models into a practical tool that can be used by the industry.micro-cracks induced in cementitious materials during concrete cracking were investigated by means of a treatment using an nc system. this study evaluated, from the effect of the ultrasonic intensity on the crack micromorphology and the evolution of the micromorphology of the microcracks. these results demonstrate that the duration of treatment must be sufficient to prevent the propagation of microcracks. the abraded surface layer was influenced by the time of ultrasonic treatment.by s.g. srivatsan, c.k. venkatesh and s.r. subramanian. this group also found similar results, except that they found that cooling and sample pre-treatment could significantly affect crack-growth kinetics, and that the effect of thermo treatment parameters like temperature and duration of exposure varied with the matrix material and the cracking condition. the crack-growth kinetics were found to be related to the microstructural condition of the material, since the thermally treated materials exhibited a significant change in the microstructure. they also found that a cooling-up temperature treatment was most effective for the treatment of cracks.
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