The basic material properties that need to be known for accurate Finite Element Analysis are: 1) Stress-Strain relationship, Young’s modulus of elasticity 2) Yield strength. 3) Bulk and shear modulus. 4) Poisson’s ratio. 5) Density. The relationship between applied mechanical force/stress and resulting deformation/strain on a given material is called its stress-strain curve or a […]
Non-linear Viscoelastic Dynamic Properties of Polymer, Rubber and Elastomer Materials Static testing of materials as per ASTM D412, ASTM D638, ASTM D624 etc can be cate- gorized as slow speed tests or static tests. The difference between a static test and dynamic test is not only simply based on the speed of the test but also […]
Rubber components under multiaxial cyclic loading conditions are often considered to have failed or degraded when there is a change is the stiffness of the component and it is no longer able to provide the performance it is designed for. Elastomeric polymer components are widely used in many industries like automotive, aerospace and biomedical applications due to […]
ASTM D 5992 Test Standard applies to Dynamic Properties of Rubber Vibration Products such as springs, dampers, and flexible load-carrying devices, flexible power transmission couplings, vibration isolation components and mechanical rubber goods. The standard applies to to the measurement of stiffness, damping, and measurement of dynamic modulus. Dynamic testing is performed on a variety of […]
ASTM D5992 and ISO 4664-1 ASTM D5992 covers the methods and process available for determining the dynamic prop- erties of vulcanized natural rubber and synthetic rubber compounds and components. The standard covers the sample shape and size requirements, the test methods, and the pro- cedures to generate the test results data and carry out further […]
My short book on Dynamic Properties of Polymer Materials and Their Measurements provides an introduction to solid polymer materials and their time, frequency and temperature dependent properties. It provides a review of the basic theory, how the materials are experimentally characterized, and how to analyze and predict their behavior under different service conditions.
. Dynamic Properties of Polymer Materials and their Measurements Polymer materials in their basic form exhibit a range of characteristics and behavior from elastic solid to a viscous liquid. These behavior and properties depend on the temperature, frequency and time scale at which the material or the engineering component is analyzed. The viscous liquid polymer […]
Limitations of Hyperelastic Material Models Introduction: Polymeric rubber components are widely used in automotive, aerospace and biomedical systems in the form of vibration isolators, suspension components, seals, o-rings, gaskets etc. Finite element analysis (FEA) is a common tool used in the design and development of these components and hyperelastic material models are used to describe […]
The application of computational mechanics analysis techniques to elastomers presents unique challenges in modeling the following characteristics: 1) The load-deflection behavior of an elastomer is markedly non-linear. 2) The recoverable strains can be as high 400 % making it imperative to use the large deflection theory. 3) The stress-strain characteristics are highly dependent on temperature […]
Abaqus – Tips and Tricks: When to use what Elements? For a 3D stress analysis, ABAQUS offers different typess of linear and quadratic hexahedral elements, a brief description is as below; Linear Hexahedral: C3D8 further subdivided as C3D8R, C3D8I, and C3D8H Quadratic Hexahedral: C3D20 further subdivided as C3D20R, C3D20I, and C3D20H, C3D20RH Linear Tetrahedral: C3D4 further subdivided as […]
