Scission and Healing in a Spinning Elastomeric Cylinder at Elevated Temperature
نویسندگان
چکیده
When an elastomeric material is subject to sufficiently high temperature, macromolecular network junctions can undergo time-dependent scission and re-crosslinking (healing). The material system then consists of molecular networks with different reference states. A constitutive framework, based on the experimental work of Tobolsky, is used to determine the evolution of deformation of a solid rubber cylinder spinning at constant angular velocity at an elevated temperature. Responses based on underlying neo-Hookean, Mooney-Rivlin, and Arruda-Boyce models, were solved numerically and compared. Different amounts of healing were studied for each case. For neo-Hookean molecular networks, there may be a critical finite time when the radius grows infinitely fast and the cylinder ‘‘blows up.’’ This time depends on the angular velocity and the rate of re-cross linking. In addition, no solution was possible for angular velocities above a critical value, even without the effects of scission. Such anomalous behavior does not occur for MooneyRivlin or Arruda-Boyce network response. @DOI: 10.1115/1.1485757#
منابع مشابه
A Correspondence Principle for Scission-Induced Stress Relaxation in Elastomeric Components
A method is presented for calculating the stress relaxation due to scission in elastomeric components that operate at a fixed deformation while at an elevated temperature. A relationship is established between stresses at different temperatures that is called the correspondence principle for scission/healing materials. Two examples involving cylinders illustrate its use. The first example invol...
متن کاملTorsion of an Elastomeric Cylinder Undergoing Microstructural Changes
Abstract. A constitutive theory which accounts for scission and cross linking processes in polymers during deformation is used to analyze the torsion of a circular bar. In each increment of deformation at a material element of the torsion bar, some volume fraction of material undergoes scission and then re-cross links to form a new network with a new reference state. The scission process reduce...
متن کاملInfluence of thermally induced scission and crosslinking on the post-scission inflation of circular elastomeric membranes
When an elastomeric material is deformed and subjected to temperatures above some characteristic value Tcr (near 100 C for natural rubber), macromolecular chains and crosslinks undergo scission, recoiling and re-crosslinking. The process depends on time and temperature and continues until the temperature decreases below Tcr. Compared to the virgin material, the new material system has modified ...
متن کاملThermo-mechanics of Elastomers Undergoing Scission and Cross-linking at High Temperatures
This paper focuses on the effect of high temperatures on an elastomeric component. There are two sources of temperature rise, a hot environment and internal heating due to mechanical loading such as occurs during cyclic loading. Internal mechanical heating can lead to a substantial temperatures occuring within the component. When the temperature of the material becomes sufficiently high, macrom...
متن کاملA Numerical Study on the Aeroacoustic Radiation from a Finite Length Rotating Cylinder
Rotating cylinders have wide applications in different areas, especially the aerodynamic area. However, the acoustic behaviors of these components have not been widely studied. The generating noise from a spinning cylinder is mainly due to the detached vortices from the leeward of the body. In this study, the large eddy simulation technique is used to simulate the flow field over a three-dimens...
متن کامل