DEFORMATION OF SOLIDS
I
THEORY
The RSA-G2 imposes a mechanical deformation on a specimen and
measures the resulting stress response. The science concerned with the
study of deformation and flow of materials is called rheology. Deformation
is the relative change in shape of a body, or STRAIN, under the influence
of an external force, or STRESS. Flow is a continuous relative change in
shape per unit time, or STRAIN RATE, under influence of external STRESS.
The RSA-G2 is in fact a linear rheometer, or a precision instrument. which
contains a specimen of the material of interest in a geometric configuration,
controls the environment around it, and applies and measures wide ranges
of STRESS, STRAIN, and STRAIN RATE. An alternative definition of rheology,
relating more directly to the function of the rheometer, is the study of stress
strain or stress-strain rate relationships. The material response to external
forces can be purely viscous or Newtonian behavior, purely elastic or
Hookean behavior, or a combination of both. Nearly all commercial
materials of interest respond with a combination of viscous and elastic
behavior and are referred to as viscoelastic materials. Scientists use the
RSA-G2 and rheology theory to study these rigid solid, soft solid, and
highly viscous liquid materials in terms of a variety of material parameters
such as modulus, compliance, and elasticity. Modulus is a measure of a
material's overall resistance to deformation. Compliance is a measure of
the material's ability to respond to a mechanical deformation. Elasticity is
a measure of a material's ability to store deformational energy. The RSA-G2
is capable of applying a variety of deformation types over a wide range of
temperatures and time-scales, and calculates these material parameters
providing a wealth of information about a material's structure-property
relationships and its performance characteristics.
A
=
area
I
I
,'
�--
l
---�'
F
=
Force
,
,
,
Stress:
a
=
F
I
A
Strain:
10
=
di/io
Compliance:
D
=
lOla
Modulus:
E
=
alE
Summary of Contents for RSA-G2
Page 1: ......
Page 9: ...Forced Convection Oven with tension clamp Technology 8...
Page 13: ...IMMERSION TESTING I CLAMPING SYSTEMS...
Page 15: ...DETA I DIELECTRIC THERMAL ANALYSIS ACCESSORY DETA...
Page 29: ...tainstruments com 2019 TA Instruments All rights reserved L50027 001...
Page 30: ...Verso Filler Page z z...
Page 31: ...n getting Started guide Revision D Issued July 2022...
Page 99: ...Issued November 2013 Supplement to Getting Started Guide TA Instruments Manual Supplement...
Page 100: ...Page 2 TA Instruments Manual Supplement This page is intentionally blank...
Page 113: ...Page 1 Page 1 RSA G2 Solids Analyzer Revision G Issued May 2022 Site Preparation Guide...