TY - GEN

T1 - Mechanical model of damage and fracture of aging polymer materials

AU - Arutyunyan, Alexander R.

AU - Arutyunyan, Robert A.

PY - 2016

Y1 - 2016

N2 - Polymers and polymer-based materials are used in many applicationsin medicine and industry. These applications frequently have a very highperformance demand, which makes their long-term aging characteristics ofparamount importance. At the same time they are subjected to degradationdue to environmental factors, including light, temperature, stress, and others.During the aging the degradation of polymers lead to changes in the physical and mechanical properties. As a result of degradation the material maybecome less deformable and brittle. These eects are studied in long-termtests of specimens made of polyurethane in tension, compression, cyclic loading, climatic and strain aging, as well as in experiments carried out on therubber samples in tension and climatic aging at room temperature. In allexperiments a signicant eect of hardening and embrittlement of materialsduring long-term aging is observed. The obtained results allow us to formulatethe interconnected kinetic equations for the creep rate and damage parameter. These equations are written in the scale of real and eective time. Theanalytical relations for creep, damage parameter and the criteria of long-termstrength are obtained. Corresponding theoretical curves are constructed andtheir qualitative agreement with the experimental curves is shown.

AB - Polymers and polymer-based materials are used in many applicationsin medicine and industry. These applications frequently have a very highperformance demand, which makes their long-term aging characteristics ofparamount importance. At the same time they are subjected to degradationdue to environmental factors, including light, temperature, stress, and others.During the aging the degradation of polymers lead to changes in the physical and mechanical properties. As a result of degradation the material maybecome less deformable and brittle. These eects are studied in long-termtests of specimens made of polyurethane in tension, compression, cyclic loading, climatic and strain aging, as well as in experiments carried out on therubber samples in tension and climatic aging at room temperature. In allexperiments a signicant eect of hardening and embrittlement of materialsduring long-term aging is observed. The obtained results allow us to formulatethe interconnected kinetic equations for the creep rate and damage parameter. These equations are written in the scale of real and eective time. Theanalytical relations for creep, damage parameter and the criteria of long-termstrength are obtained. Corresponding theoretical curves are constructed andtheir qualitative agreement with the experimental curves is shown.

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

M3 - Conference contribution

SP - 28

EP - 33

BT - Advanced Problems in Mechanics 2016

PB - Издательство Санкт-Петербургского Государственного Политехнического Университета

CY - СПб

T2 - Advanced Problems in Mechanics, APM 2015. XLIV International Conference

Y2 - 27 June 2016 through 2 July 2016

ER -