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In a powder bed induction heater system, we have demonstrated a bottom-up process for producing crack-free AA6061 and subsequent in-process testing and characterization. A near-net-shape aluminum alloy 6061 (AA6061) ingot was used as a test article to validate the system. The microstructure and properties of the AA6061 ingot were carefully characterized prior to using it in the fabrication of the crack-free cylindrical test piece. Crack-free AA6061 test piece was fabricated using a customized powder bed induction (PBI) machine. The crack-free test piece was tested in the PBI machine, where it was heated using a specially designed induction coil. This process was followed by testing the crack-free test piece using a 3D laser vibrometer. The laser vibrometer was used to evaluate the velocity response of crack-free test piece at a critical defect location (a notch) as a function of crack spacing. Crack-free test piece was also characterized using a 3D scanning laser vibrometer to measure the velocity response of crack-free test piece at critical notch locations. Three-dimensional laser vibrometer measurements were compared against a completely crack-free test piece. The results from the 3D laser vibrometer and the 3D scanning vibrometer showed good agreement at the entire range of crack spacing. The results from the laser vibrometer revealed that crack-free test pieces are non-linear in velocity response. The crack-free test piece was also tested using a universal testing machine to measure the flexural strength. The flexural strength of crack-free test piece was found to be within the manufacturing tolerance range.
Cracks propagating in Ti-6Al-4V alloys are commonly observed in commercially available parts and are believed to be a major factor that limits the fatigue lifetime. The current fatigue design life of Ti-6Al-4V components remains limited to values of ~100 million cycles. The application of image analysis techniques can aid the understanding of the crack propagation mechanisms in this alloy system by providing information on crack initiation, growth, and coalescence.
When you're looking at a multi-band equalizer, it is first important to understand that audio processing is an anisotropic, and not isotropic, operation, meaning that the process is applied in a different manner depending on the direction a signal moves through the filter. iZotope's Neutron EQ module was designed to be an isotropic, or same-direction, filter, meaning that it operates in the same manner regardless of the direction a signal moves through it. So, for example, a band that is narrow near the upper frequency of a guitar signal will behave the same, regardless of whether that signal is moving toward or away from the speaker. 827ec27edc