高分子材料の構成式を検討するためのいくつかの実験
Some Experiments for Discussing a Constitutive Equation of Solid Polymers
北川正義・周 徳信
Kitagawa, Masayoshi / Zhou, Dexin
In order to understand a constitutive equation of solid polymers, volume expansion and stress-strain behavior after strain reversal were investigated due to compression using amorphous polymers and crystalline polymers. The following are very interesting results for studying the constitutive law obtained from the present study : (1) For crystalline polymers, volume expansion may occur even at uniaxial compression where the first stress invariant is negative, and (2) at a stress relaxation (or creep) test after strain reversal, the stress rate (or the strain rate) may change its sign during the test depending on the test condition.
Key words: Constitutive equation / Volume expansion / Strain reversal / Stress relaxation / Creep