ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The values of setting expansion of investment under uniaxial stress have been determined at conditions designed to obtain the difference of setting expansion between that parallel to the loading direction and that perpendicular to the loading axis. The setting expansion curves were represented by $$a(t) = a_0 (1 - P/E')[1 - exp( - kt)]$$ along the loading direction and $$a(t) = a_0 (1 + \nu 'P/E')[1 - exp( - kt)]$$ perpendicular to the loading direction, wherea(t) is a setting expansion,a 0 = 0.009,ν′ = 0.2,E′ = 5 kg cm−2,k = 0.032 min−1,P applied stress, andt the time (min). On the basis of these results, a method to estimate the value of setting expansion under restrictive force was developed. According to this method, the setting expansion of the investment could be calculated by substitutingϱε/ϱt forε, ka 0 exp (−kt)/E′ for 1/E, ν′ forν, andka 0 exp (−kt) forαT in the theory of elasticity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01139018
Permalink
