. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. Elongation 20-. Fig. 56 Hookes Law that Stress is proportionalto strain. When theelastic limit is reachedthe law is no longertrue. A generation agowhen steel was stressedto 16,000 lbs. per squareinch it was said to havea factor of safety of 4,based on the ultimatestrength of the steel,64,000 lbs. per squareinch. To-day the fac-tor of safety is basedon the elastic limit, andas this varies between29,000 and 36,000 lbs. per square
. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. Elongation 20-. Fig. 56 Hookes Law that Stress is proportionalto strain. When theelastic limit is reachedthe law is no longertrue. A generation agowhen steel was stressedto 16,000 lbs. per squareinch it was said to havea factor of safety of 4,based on the ultimatestrength of the steel,64,000 lbs. per squareinch. To-day the fac-tor of safety is basedon the elastic limit, andas this varies between29,000 and 36,000 lbs. per square inch, averaging about 32,000 lbs.,depending upon the hardness of the steel, the factor of safety issaid to be 2, based on the elastic limit. There is a permanent setafter the elastic limit is passed and a progressive weakening, eventhough the material may not fail until it is stressed up to fourtimes the allowable working fiber stress. Modulus of Elasticity The modulus of elasticity is a number obtained by dividing thestress by the deformation it causes. If it were a force it wouldbe defined as a force which will stretch a unit piece of material totwice its length or compress
Size: 1599px × 1563px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidpracticalstr, bookyear1921
