TY - JOUR
AU - Kari Juhani Santaoja
PY - 2019/08/31
Y2 - 2019/11/22
TI - On continuum damage mechanics
JF - Rakenteiden Mekaniikka
JA - RakMek
VL - 52
IS - 3
SE - XIII Suomen mekaniikkapäivien 2018 erikoisnumero
DO - 10.23998/rm.76025
UR - https://rakenteidenmekaniikka.journal.fi/article/view/76025
AB - A material containing spherical microvoids with a Hookean matrix response was shown to take the appearance usually applied in continuum damage mechanics. However, the commonly used variable damage D was replaced with the void volume fraction f , which has a clear physical meaning, and the elastic strain tensor \Bold {ε}^e with the damage-elastic strain tensor \Bold {ε}^{de}. The postulate of strain equivalence with the effective stress concept was reformulated and applied to a case where the response of the matrix obeys Hooke’s law. In contrast to many other studies, in the derived relation between the effective stress tensor \Bold {\Tilde{σ}} and the stress tensor \Bold {σ}, the tensor \Bold {\Tilde{σ}} is symmetric. A uniaxial bar model was introduce for clarifying the derived results. Other candidates for damage were demonstrated by studying the effect of carbide coarsening on creep rate.
ER -