Premium
A comparison between the stress–relaxation behavior of molybdenum and polyethylene
Author(s) -
Hagström B.,
Kubát J.,
Rigdahl M.
Publication year - 1988
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1988.070360609
Subject(s) - polyethylene , molybdenum , relaxation (psychology) , stress relaxation , materials science , stress (linguistics) , thermodynamics , composite material , metallurgy , creep , physics , psychology , social psychology , linguistics , philosophy
The stress–relaxation behaviors of molybdenum (Mo) and polyethylene are compared, especially with regard to the role played by the internal stress level, in the relation F = 0.1(σ 0 − σ i ). Here F is the maximum slope in the inflexion region of stress vs. In time curves (σ vs. ln t ), σ 0 is the initial stress, and σ i is the internal (equilibrium) stress. Despite a significant difference in σ i in the two materials, this relation was obeyed in both cases. The data for Mo are for room temperature and 90 K; those for low and high density polyethylene for room temperature only. Some of the data are reevaluated results of earlier measurements. The shape of the σ i (ϵ) curves is reminiscent of the σ(ϵ) behavior for both Mo and polyethylene. The implications of the results for interpretation of the relaxation process in terms of current theoretical concepts is discussed.