Papers by Keyword: Stress-Strain Diagram

Abstract: This paper presents the study results of the nonlinear stress-strain diagrams of concrete based on the local materials of Central Yakutia. The results of comparing the obtained data with the requirements of normative documents of the Russian Federation, European countries, India and China are presented. The calculation results for bending bearing elements with concrete nonlinear deformation taken into account obtained using the Ansys software are given. The reliability of the calculated data was verified using the proposed diagrams, using the example of the results of a survey of characteristic failures of bending concrete and reinforced concrete elements in the Republic of Sakha (Yakutia).

Abstract: The stress-strain diagrams of concrete with frame structure made with content of coarse aggregate from 0.56 till 0.64 m³/m³, with crushed granite (E-modulus = 71 GPa) and crushed silica sandstone (E-modulus = 42 GPa) are shown. It is shown that the stress-strain diagram of the concrete with frame structure made with coarse aggregate with E-modulus 42 GPa is almost linear over the entire loading range. Stress-strain diagram of concrete made with coarse aggregate with E-modulus 71 GPa has three zones. It is concluded that the concentration of intrastructural stresses under loading in the concrete with frame structure with a decrease in the ratio of E-modulus of the coarse aggregate/E-modulus of the mortar matrix is decrease that is why bad decision is to use coarse aggregate with high level of E-modulus, such as crushed granite, in concrete with frame structure.

Abstract: In order to compare the strengths of various materials it is necessary to carry out a standard form of test to establish their relative properties. The tensile test, compression test, bending, shearing and torsion tests are used for examining mechanical properties of biological materials. Except for non-destructive methods (optical, electromagnetic, sonic, thermal, infrared), destructive testing is another very important tool for the assessment of biomechanical properties and behavior of biomedical materials. The tensile strength test is one of the most common testing methods, which uses specific testing machines. Many tensile testing machines are equipped to plot a curve which shows the load or stress and the strain or movement that occurs during the test operation. In the testing operation, the load is increased gradually and the specimen will stretch or elongate in proportion to the tensile load. The load cells and extensometers measure the key parameters of force and deformation. The presented paper is a report which describes a specific and unique technical solution and upgrade of FM 1000 machine from the control and output processing point of view. Modern sensoric systems and I/O modules were used and custom software was developed. The fu

Abstract: The paper investigates the mechanical properties of sintered hollow sphere struc- tures. First of all, the Young's modulus, plastic modulus, initial flow stress, initial flow strain, plateau stress and densifcation strain are derived from compressive tests. In addition, the material behaviour during the compressive testing is described. Furthermore, the influence of different specimen shapes on the results is discussed.