Strain-Controlled High-Cycle Fatigue of Solder Joints for High-Reliability Environments
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Laing, John Robert↗
Engineering topics
Laing, John Robert
Publications and source records attributed to Laing, John Robert.
Room temperature time dependent deformation in small springs.
Abstract not provided.
Deibler, Lisa Anne↗
Inconsistent Mechanical Performance of Additively Manufactured 17-4PH.
Abstract not provided.
Salzbrenner, Bradley↗
Defect Characterization for Material Assurance in Metal Additive Manufacturing (FY15-0664)
No industry-wide standards yet exist for minimum properties in additively manufactured (AM) metals. While AM alloys such as 17-4 precipitation hardened stainless steel have been shown to have average properties that can be comparable to wrought or cast product, they suffer from inconsistent performance. Variability in the feedstock powder, feature sizes, thermal history, and laser performance can lead to unpredictable surface finish, chemistry, phase content, and defects. To address this issue, rapid, efficient, high-throughput mechanical testing and data analysis was developed, providing profound statistical insight into the stochastic variability in properties. With this new approach, 1000’s of comprehensive tensile tests can be performed for the cost of 10’s of conventional tests. This new high-throughput approach provides a material qualification pathway that is commensurate with the quick turn-around benefit of AM.
36 MATERIALS SCIENCE↗
High fidelity measurement of room temperature creep in NW alloys
The objective of this work was to assemble instrumentation to do the best resolution strain measurements with available equipment overa long (goal of 3 month) period of time on 304L samples. Two creep tests were performed on 304L samples for 10 6 seconds and instrumented with both strain gages and extensometers. The results of the test show the difficulty in accurately instrumenting creep tests for long periods of time. While the data from the strain gages at 10 6 seconds proved to be still discernable from the background noise caused by temperature and air fluctuations and instrument noise, lower creep rates will require enhanced measurement techniques. An additional one to two orders of magnitude of elapsed time appears feasible.
36 MATERIALS SCIENCE↗
V-Notched Rail Test for Shear-Dominated Deformation of Ti-6Al-4V.
Abstract not provided.
Kramer, Sharlotte Lorraine Bolyard↗
V-Notched Rail Test for Shear-Dominated Deformation of Ti-6Al-4V.
Abstract not provided.
Kramer, Sharlotte Lorraine Bolyard↗