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The present study investigated the geometrically necessary dislocation (GND) with the influence of the surface roughness by establishing the relation of roughness in GND for indentation. The single crystal copper with (111) oriented surface plane was chosen and polished to various roughness levels ranging from 32.7 to 224 nm and subjected to indentation. The increase in surface roughness revealed to increase in the GND and statistically stored dislocation density. As the indentation force decrease from 9.8 to 0.245 N, the plastic strain gradient related to GND increase from 0.0001 up to 0.0017 µm−1 for each 1 nm increment of surface roughness. ....
Pure copper specimens 0.1, 0.2, and 0.3 mm thick were annealed at different temperatures. The influence of the size effect on the mechanical properties and fracture behavior of annealed pure copper was investigated in a uniaxial tensile test. The elongation and tensile strength decreased with the grain size at a constant specimen thickness. If the grain size remains constant and its thickness varies, the tensile strength and elongation increase with the specimen thickness. The specimen grain size and thickness can significantly affect the fracture behavior of pure copper. If the grain size is increased and the specimen thickness is reduced, the fracture behavior tends to change from a mixed fracture mode to a slip fracture one. ....
I agree that it s hard to see exactly how this rights itself, but it can, it should, and i think it will. you know, everybody is in this hobbsian moment. everything is weaponized. the little red hen, whatever it is, is weaponized, the mexican restaurants are. if you re on the left, you re thinking why isn t this appropriate? if i really believe that these people are that these people within the administration are ruining america, why can t i take a stand in the best way i know how? so i understand the reaction to it. and i think, you know, the trump people, there is a reason they are where they are. they are very good at playing suddenly, why can t we all get along, after they have relentlessly and really created a culture of bullying at the very highest levels. if anything, this is a reminder that the president, the presidency, has an out size effect on our manners and ....
Relentlessly and really created a culture of bullying at the very highest levels. if anything, this is a reminder that the president, the presidency, has an out size effect on our manners and morals. some say we are too sentimental on the presidency. even before when he was attacking obama and his birth which is not an issue, if trump had not helped exacerbate the tribal tendencies, he wouldn t be his staff wouldn t be facing this kind of backlash. so you reap what you sow. far be it from me to disagree with john meacham, i don t think they re saying let s get along. i think they re using this to drive the wedge further and further. it s all tongue in cheek. i don t think there is anything about this that they re saying, oh, my gosh, can t we all be nice to each other in restaurants? the other piece of this is ....