EMA_4714Unit_1_exam_key_2008

EMA_4714Unit_1_exam_key_2008 - EMA 4714 - Materials...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: EMA 4714 - Materials Selection and Failure Analysis Unit 1 Examination Wednesday , February 13, 2008 Name _______________________ Open Book/Open Notes 1. [10 points] Considering the inherent asymmetry of W-shape beams as used in the boat-lift case study, you are being asked to redesign using HSS [Hollow Structural Section] shapes, which would eliminate the problem which was manifest in the lift failure. Your design should be equivalent to the Davit Master 7M model in terms of the weight bearing capacity [70% of 7000 pounds on rear support] and beam length [12 feet], but increase the safety margin by assuming WCS [worst case scenario] - all weight on rear support - and a load safety factor of 1.25. In addition, you are instructed to consider weight [no more than 150 pounds for a 12 foot long beam] and cost. You may design for two point loading on supports which are 3 feet apart [1.5 feet on each side of center]. Vendors for A572, grade 50 low alloy structural steel [f = 50 ksi] and 17ST aluminum structural alloy [equivalent to wrought 2017 T4, f = 35 ksi] are available. Based on data in the table below for 4.5-inch HSS square sections of varying wall thickness, design a support on data in the table below for 4....
View Full Document

This note was uploaded on 07/24/2011 for the course EMA 4714 taught by Professor Staff during the Spring '08 term at University of Florida.

Page1 / 3

EMA_4714Unit_1_exam_key_2008 - EMA 4714 - Materials...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online