Residual stress measurement methods have commonly been used to characterize states of stress in various elastic isotropic materials. In order to investigate the effects of elastic anisotropy on residual stress measurements, commercially pure grade 2 titanium (CP Ti Gr 2) was selected to study a strong texture, or preferred grain orientation. Warm rolled and air-cooled CP titanium is well known to have a texture from the factory. This texture and resulting elastic anisotropy were confirmed using two material characterization methods, resonant ultrasound spectroscopy (RUS) and electron backscatter diffraction (EBSD). The texture was further developed using a rolling mill to cold roll the titanium. A vacuum furnace set to a temperature of 550 C for one hour was used to stress relieve the titanium without reducing the texture. RUS and EBSD methods were used again to confirm the texture achieved by cold rolling. Well-characterized residual stresses were introduced with a shrink-fit ring and plug. The residual stress hole drilling method was used to characterize stresses in the rolling and transverse directions of the ring and plug assemblies. Stress profiles from hole drilling indicated some possible elastic anisotropic effects in two assemblies and are presented. However, more assemblies are needed to confirm the results. A stress determination technique with higher sensitivity may be necessary to substantiate assembly stress profile results.
| Identifer | oai:union.ndltd.org:bu.edu/oai:open.bu.edu:2144/48893 |
| Date | 28 May 2024 |
| Creators | Sanchez Archuleta, Zachary J. |
| Contributors | Holmes, Douglas P. |
| Source Sets | Boston University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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