Study of damage accumulation within the structure of polymer materials under load
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RIALS SCIENCE AND CORROSION PROTECTION STUDY OF DAMAGE ACCUMULATION WITHIN THE STRUCTURE OF POLYMER MATERIALS UNDER LOAD
O. Yu. Erenkov,1 O. V. Fofonova,2 S. N. Khimukhin,3 and E. Z. Yagubov4
Results are provided for experimental study of the deformation and failure mechanism for polymer materials with specimen uniaxial tension. An acoustic emission method is used for quantitative evaluation of the test process. Comparative analysis is provided for volumetric structural changes in specimens and corresponding acoustic emission elastic wave parameters for brittle and ductile materials.
One of the main tasks in creating contemporary machines and structures is provision of strength, reliability, and endurance. In constructing objects or components of structural materials, including polymer materials, it is necessary to know what loading limits they may withstand and how they behave under action of a mechanical load. The choice of a specific polymer material (PM) depends on the nature and amount of load and this is only possible after the necessary material tests. Material testing is often carried out in tension, since this form of deformation is a more critical form of material stressed state [1, 2], and therefore mechanical properties determined in tension are the main starting data in calculation for PM component and structure strength. Evaluation of PM object reliability, based on selective monitoring using statistical methods, is hardly effective due to their structural inhomogeneity and physicochemical property instability, and also due to the effect of production factors within the limits of even a single object. These features reduce not only PM object reliability, but also the accuracy and reliability of an estimate. Therefore, nondestructive methods in determining mechanical properties and material behavior under load are very valuable. A acoustic emission (AE) method [3–7] is used for nondestructive PM monitoring and prediction of object and component strength properties, based on recording and treatment of elastic stress wave parameters, occurring as a result of forming, changes, and breakdown of the structure of different materials. This method provides for preparation of a significant amount of information about physical processes occurring within a material structure, and makes it possible to evaluate quantitatively the degree of damage accumulation and to establish structural transformation mechanisms. A study of damage accumulation kinetics during loading with revelation of a failure mechanism in each deformation stage is of important theoretical and applied value for fracture mechanics of structural PM, and development of approaches for predicting strength reliability and endurance of an object made from these materials. 1
Pacific Ocean State University, Khabarovsk, Russia. Far East Research Institute of Shipbuilding Technology, Khabarovsk, Russia. 3 Institute of Material Sciences, Khabarovsk Scientific Center, Far East Branch of Russian Academy of Sciences, Khabarovsk, Russia. 4 Branch of Far East F
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