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Mechanical Engineering MS Thesis Defense by Mr. Samuel G. Benoit

When: Monday, April 27, 2015
1:00 PM - 3:00 PM
Where: Textiles Building 101E
Description: The Mechanical Engineering Department is pleased to announce the

MS THESIS DEFENSE of Mr. Samuel G. Benoit

April 27, 2015
1:00 p.m. - 3:00 p.m.
Textile Building, Room 101E

TOPIC:
ADVANCED ALUMINUM ALLOYS FOR USE IN UNDERWATER APPLICATIONS


ABSTRACT:
Three aluminum alloys, 7085-OCR3 (Optimized Corrosion Resistance), 7175-T7452, and Al-Sc (Aluminum Scandium) are investigated. The properties of tensile strength, percent elongation, resistance to localized corrosion, and fracture toughness were of interest. 7085-OCR3 and 7175-T7425 samples were machined from a 21 in diameter tubular forging manufactured by a reverse impact extrusion process. The Al-Sc forging was 14 in diameter and manufactured by a rolling process. Samples were taken for each test in such a way that they were oriented in three principle working directions: radial, circumferential, and longitudinal. Tensile tests were conducted according to ASTM E-8 on standard 4 dogbones, or 2.5 modified dogbones. Fracture toughness testing was conducted in accordance with ASTM E-1820-01 on standard 0.5 compact tension (CT) specimens.

The localized corrosion investigation was performed by implementing both a submersion test to observed exfoliation corrosion as well as a galvanostaircase polarization (GSCP) test, ASTM G34 and ASTM G100, respectively. 7085-OCR3 far outperformed the 7175-T7452 and Al-Sc in terms of mode-I fracture toughness. It is proposed that the reduced levels on iron and silicon found in 7085-OCR3 are responsible for the increase in fracture toughness as compared to 7175-T7452.

ADVISOR:
Dr. Vijaya Chalivendra

COMMITTEE MEMBERS:
Dr. Vijaya Chalivendra, Dr. John Rice, Dr. Robert Doleski


Open to the public.

All MNE students are encouraged to attend.


For more information, please contact Dr. Vijaya Chalivendra (vchalivendra@umassd.edu, 508-910-6572)


Thank you.
Topical Areas: University Community, College of Engineering, Mechanical Engineering