TY - GEN

T1 - The problem of damage and high-temperature creep fracture of metals

AU - Arutyunyan, Alexander R.

AU - Arutyunyan, Robert A.

AU - Saitova, Regina R.

PY - 2016

Y1 - 2016

N2 - Numerous experimental studies on changes of the porosity and density ofvarious metals and alloys due to the formation and development of microporesand microcracks in the process of high-temperature creep are carried out. Theresults of these studies allow us to consider the density as an integral measureof the structural micro-defects accumulation, and the damage parameter isdened as the ratio of current density to initial density. Taking into accountthis parameter and the mass conservation law interconnected kinetic equationsfor creep deformation and damage parameter are formulated. In the case ofpure brittle fracture the analytical solutions of these equations are received andthe criterion of long-term strength is formulated. The ductile-brittle fractureis also considered. An analytical solution connecting the damage parameterto the value of deformation is obtained. In this case, the creep deformationis calculated approximately. The appropriate choice of the coecients of theapproximate solution allows describing the experimental creep curves.

AB - Numerous experimental studies on changes of the porosity and density ofvarious metals and alloys due to the formation and development of microporesand microcracks in the process of high-temperature creep are carried out. Theresults of these studies allow us to consider the density as an integral measureof the structural micro-defects accumulation, and the damage parameter isdened as the ratio of current density to initial density. Taking into accountthis parameter and the mass conservation law interconnected kinetic equationsfor creep deformation and damage parameter are formulated. In the case ofpure brittle fracture the analytical solutions of these equations are received andthe criterion of long-term strength is formulated. The ductile-brittle fractureis also considered. An analytical solution connecting the damage parameterto the value of deformation is obtained. In this case, the creep deformationis calculated approximately. The appropriate choice of the coecients of theapproximate solution allows describing the experimental creep curves.

UR - https://www.ipme.ru/ipme/conf/APM2016/Project-Proceedings-2016.pdf

M3 - Conference contribution

SP - 34

EP - 40

BT - Proceedings of XLIV International Summer School-Conference APM 2016

PB - Издательство Санкт-Петербургского Государственного Политехнического Университета

CY - СПб

Y2 - 27 June 2016 through 2 July 2016

ER -